<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\db;

use Yii;
use yii\base\InvalidArgumentException;
use yii\base\InvalidCallException;
use yii\base\InvalidConfigException;
use yii\base\InvalidParamException;
use yii\base\Model;
use yii\base\ModelEvent;
use yii\base\NotSupportedException;
use yii\base\UnknownMethodException;
use yii\helpers\ArrayHelper;

/**
 * ActiveRecord is the base class for classes representing relational data in terms of objects.
 *
 * See [[\yii\db\ActiveRecord]] for a concrete implementation.
 *
 * @property array $dirtyAttributes The changed attribute values (name-value pairs). This property is
 * read-only.
 * @property bool $isNewRecord Whether the record is new and should be inserted when calling [[save()]].
 * @property array $oldAttributes The old attribute values (name-value pairs). Note that the type of this
 * property differs in getter and setter. See [[getOldAttributes()]] and [[setOldAttributes()]] for details.
 * @property mixed $oldPrimaryKey The old primary key value. An array (column name => column value) is
 * returned if the primary key is composite. A string is returned otherwise (null will be returned if the key
 * value is null). This property is read-only.
 * @property mixed $primaryKey The primary key value. An array (column name => column value) is returned if
 * the primary key is composite. A string is returned otherwise (null will be returned if the key value is null).
 * This property is read-only.
 * @property array $relatedRecords An array of related records indexed by relation names. This property is
 * read-only.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @author Carsten Brandt <mail@cebe.cc>
 * @since 2.0
 */
abstract class BaseActiveRecord extends Model implements ActiveRecordInterface
{
    /**
     * @event Event an event that is triggered when the record is initialized via [[init()]].
     */
    const EVENT_INIT = 'init';
    /**
     * @event Event an event that is triggered after the record is created and populated with query result.
     */
    const EVENT_AFTER_FIND = 'afterFind';
    /**
     * @event ModelEvent an event that is triggered before inserting a record.
     * You may set [[ModelEvent::isValid]] to be `false` to stop the insertion.
     */
    const EVENT_BEFORE_INSERT = 'beforeInsert';
    /**
     * @event AfterSaveEvent an event that is triggered after a record is inserted.
     */
    const EVENT_AFTER_INSERT = 'afterInsert';
    /**
     * @event ModelEvent an event that is triggered before updating a record.
     * You may set [[ModelEvent::isValid]] to be `false` to stop the update.
     */
    const EVENT_BEFORE_UPDATE = 'beforeUpdate';
    /**
     * @event AfterSaveEvent an event that is triggered after a record is updated.
     */
    const EVENT_AFTER_UPDATE = 'afterUpdate';
    /**
     * @event ModelEvent an event that is triggered before deleting a record.
     * You may set [[ModelEvent::isValid]] to be `false` to stop the deletion.
     */
    const EVENT_BEFORE_DELETE = 'beforeDelete';
    /**
     * @event Event an event that is triggered after a record is deleted.
     */
    const EVENT_AFTER_DELETE = 'afterDelete';
    /**
     * @event Event an event that is triggered after a record is refreshed.
     * @since 2.0.8
     */
    const EVENT_AFTER_REFRESH = 'afterRefresh';

    /**
     * @var array attribute values indexed by attribute names
     */
    private $_attributes = [];
    /**
     * @var array|null old attribute values indexed by attribute names.
     * This is `null` if the record [[isNewRecord|is new]].
     */
    private $_oldAttributes;
    /**
     * @var array related models indexed by the relation names
     */
    private $_related = [];
    /**
     * @var array relation names indexed by their link attributes
     */
    private $_relationsDependencies = [];

    /**
     * {@inheritdoc}
     * @return static|null ActiveRecord instance matching the condition, or `null` if nothing matches.
     */
    public static function findOne($condition)
    {
        return static::findByCondition($condition)->one();
    }

    /**
     * {@inheritdoc}
     * @return static[] an array of ActiveRecord instances, or an empty array if nothing matches.
     */
    public static function findAll($condition)
    {
        return static::findByCondition($condition)->all();
    }

    /**
     * Finds ActiveRecord instance(s) by the given condition.
     * This method is internally called by [[findOne()]] and [[findAll()]].
     * @param mixed $condition please refer to [[findOne()]] for the explanation of this parameter
     * @return ActiveQueryInterface the newly created [[ActiveQueryInterface|ActiveQuery]] instance.
     * @throws InvalidConfigException if there is no primary key defined
     * @internal
     */
    protected static function findByCondition($condition)
    {
        $query = static::find();

        if (!ArrayHelper::isAssociative($condition)) {
            // query by primary key
            $primaryKey = static::primaryKey();
            if (isset($primaryKey[0])) {
                // if condition is scalar, search for a single primary key, if it is array, search for multiple primary key values
                $condition = [$primaryKey[0] => is_array($condition) ? array_values($condition) : $condition];
            } else {
                throw new InvalidConfigException('"' . get_called_class() . '" must have a primary key.');
            }
        }

        return $query->andWhere($condition);
    }

    /**
     * Updates the whole table using the provided attribute values and conditions.
     *
     * For example, to change the status to be 1 for all customers whose status is 2:
     *
     * ```php
     * Customer::updateAll(['status' => 1], 'status = 2');
     * ```
     *
     * @param array $attributes attribute values (name-value pairs) to be saved into the table
     * @param string|array $condition the conditions that will be put in the WHERE part of the UPDATE SQL.
     * Please refer to [[Query::where()]] on how to specify this parameter.
     * @return int the number of rows updated
     * @throws NotSupportedException if not overridden
     */
    public static function updateAll($attributes, $condition = '')
    {
        throw new NotSupportedException(__METHOD__ . ' is not supported.');
    }

    /**
     * Updates the whole table using the provided counter changes and conditions.
     *
     * For example, to increment all customers' age by 1,
     *
     * ```php
     * Customer::updateAllCounters(['age' => 1]);
     * ```
     *
     * @param array $counters the counters to be updated (attribute name => increment value).
     * Use negative values if you want to decrement the counters.
     * @param string|array $condition the conditions that will be put in the WHERE part of the UPDATE SQL.
     * Please refer to [[Query::where()]] on how to specify this parameter.
     * @return int the number of rows updated
     * @throws NotSupportedException if not overrided
     */
    public static function updateAllCounters($counters, $condition = '')
    {
        throw new NotSupportedException(__METHOD__ . ' is not supported.');
    }

    /**
     * Deletes rows in the table using the provided conditions.
     * WARNING: If you do not specify any condition, this method will delete ALL rows in the table.
     *
     * For example, to delete all customers whose status is 3:
     *
     * ```php
     * Customer::deleteAll('status = 3');
     * ```
     *
     * @param string|array $condition the conditions that will be put in the WHERE part of the DELETE SQL.
     * Please refer to [[Query::where()]] on how to specify this parameter.
     * @return int the number of rows deleted
     * @throws NotSupportedException if not overridden.
     */
    public static function deleteAll($condition = null)
    {
        throw new NotSupportedException(__METHOD__ . ' is not supported.');
    }

    /**
     * Returns the name of the column that stores the lock version for implementing optimistic locking.
     *
     * Optimistic locking allows multiple users to access the same record for edits and avoids
     * potential conflicts. In case when a user attempts to save the record upon some staled data
     * (because another user has modified the data), a [[StaleObjectException]] exception will be thrown,
     * and the update or deletion is skipped.
     *
     * Optimistic locking is only supported by [[update()]] and [[delete()]].
     *
     * To use Optimistic locking:
     *
     * 1. Create a column to store the version number of each row. The column type should be `BIGINT DEFAULT 0`.
     *    Override this method to return the name of this column.
     * 2. Ensure the version value is submitted and loaded to your model before any update or delete.
     *    Or add [[\yii\behaviors\OptimisticLockBehavior|OptimisticLockBehavior]] to your model
     *    class in order to automate the process.
     * 3. In the Web form that collects the user input, add a hidden field that stores
     *    the lock version of the recording being updated.
     * 4. In the controller action that does the data updating, try to catch the [[StaleObjectException]]
     *    and implement necessary business logic (e.g. merging the changes, prompting stated data)
     *    to resolve the conflict.
     *
     * @return string the column name that stores the lock version of a table row.
     * If `null` is returned (default implemented), optimistic locking will not be supported.
     */
    public function optimisticLock()
    {
        return null;
    }

    /**
     * {@inheritdoc}
     */
    public function canGetProperty($name, $checkVars = true, $checkBehaviors = true)
    {
        if (parent::canGetProperty($name, $checkVars, $checkBehaviors)) {
            return true;
        }

        try {
            return $this->hasAttribute($name);
        } catch (\Exception $e) {
            // `hasAttribute()` may fail on base/abstract classes in case automatic attribute list fetching used
            return false;
        }
    }

    /**
     * {@inheritdoc}
     */
    public function canSetProperty($name, $checkVars = true, $checkBehaviors = true)
    {
        if (parent::canSetProperty($name, $checkVars, $checkBehaviors)) {
            return true;
        }

        try {
            return $this->hasAttribute($name);
        } catch (\Exception $e) {
            // `hasAttribute()` may fail on base/abstract classes in case automatic attribute list fetching used
            return false;
        }
    }

    /**
     * PHP getter magic method.
     * This method is overridden so that attributes and related objects can be accessed like properties.
     *
     * @param string $name property name
     * @throws InvalidArgumentException if relation name is wrong
     * @return mixed property value
     * @see getAttribute()
     */
    public function __get($name)
    {
        if (isset($this->_attributes[$name]) || array_key_exists($name, $this->_attributes)) {
            return $this->_attributes[$name];
        }

        if ($this->hasAttribute($name)) {
            return null;
        }

        if (isset($this->_related[$name]) || array_key_exists($name, $this->_related)) {
            return $this->_related[$name];
        }
        $value = parent::__get($name);
        if ($value instanceof ActiveQueryInterface) {
            $this->setRelationDependencies($name, $value);
            return $this->_related[$name] = $value->findFor($name, $this);
        }

        return $value;
    }

    /**
     * PHP setter magic method.
     * This method is overridden so that AR attributes can be accessed like properties.
     * @param string $name property name
     * @param mixed $value property value
     */
    public function __set($name, $value)
    {
        if ($this->hasAttribute($name)) {
            if (
                !empty($this->_relationsDependencies[$name])
                && (!array_key_exists($name, $this->_attributes) || $this->_attributes[$name] !== $value)
            ) {
                $this->resetDependentRelations($name);
            }
            $this->_attributes[$name] = $value;
        } else {
            parent::__set($name, $value);
        }
    }

    /**
     * Checks if a property value is null.
     * This method overrides the parent implementation by checking if the named attribute is `null` or not.
     * @param string $name the property name or the event name
     * @return bool whether the property value is null
     */
    public function __isset($name)
    {
        try {
            return $this->__get($name) !== null;
        } catch (\Throwable $t) {
            return false;
        } catch (\Exception $e) {
            return false;
        }
    }

    /**
     * Sets a component property to be null.
     * This method overrides the parent implementation by clearing
     * the specified attribute value.
     * @param string $name the property name or the event name
     */
    public function __unset($name)
    {
        if ($this->hasAttribute($name)) {
            unset($this->_attributes[$name]);
            if (!empty($this->_relationsDependencies[$name])) {
                $this->resetDependentRelations($name);
            }
        } elseif (array_key_exists($name, $this->_related)) {
            unset($this->_related[$name]);
        } elseif ($this->getRelation($name, false) === null) {
            parent::__unset($name);
        }
    }

    /**
     * Declares a `has-one` relation.
     * The declaration is returned in terms of a relational [[ActiveQuery]] instance
     * through which the related record can be queried and retrieved back.
     *
     * A `has-one` relation means that there is at most one related record matching
     * the criteria set by this relation, e.g., a customer has one country.
     *
     * For example, to declare the `country` relation for `Customer` class, we can write
     * the following code in the `Customer` class:
     *
     * ```php
     * public function getCountry()
     * {
     *     return $this->hasOne(Country::className(), ['id' => 'country_id']);
     * }
     * ```
     *
     * Note that in the above, the 'id' key in the `$link` parameter refers to an attribute name
     * in the related class `Country`, while the 'country_id' value refers to an attribute name
     * in the current AR class.
     *
     * Call methods declared in [[ActiveQuery]] to further customize the relation.
     *
     * @param string $class the class name of the related record
     * @param array $link the primary-foreign key constraint. The keys of the array refer to
     * the attributes of the record associated with the `$class` model, while the values of the
     * array refer to the corresponding attributes in **this** AR class.
     * @return ActiveQueryInterface the relational query object.
     */
    public function hasOne($class, $link)
    {
        return $this->createRelationQuery($class, $link, false);
    }

    /**
     * Declares a `has-many` relation.
     * The declaration is returned in terms of a relational [[ActiveQuery]] instance
     * through which the related record can be queried and retrieved back.
     *
     * A `has-many` relation means that there are multiple related records matching
     * the criteria set by this relation, e.g., a customer has many orders.
     *
     * For example, to declare the `orders` relation for `Customer` class, we can write
     * the following code in the `Customer` class:
     *
     * ```php
     * public function getOrders()
     * {
     *     return $this->hasMany(Order::className(), ['customer_id' => 'id']);
     * }
     * ```
     *
     * Note that in the above, the 'customer_id' key in the `$link` parameter refers to
     * an attribute name in the related class `Order`, while the 'id' value refers to
     * an attribute name in the current AR class.
     *
     * Call methods declared in [[ActiveQuery]] to further customize the relation.
     *
     * @param string $class the class name of the related record
     * @param array $link the primary-foreign key constraint. The keys of the array refer to
     * the attributes of the record associated with the `$class` model, while the values of the
     * array refer to the corresponding attributes in **this** AR class.
     * @return ActiveQueryInterface the relational query object.
     */
    public function hasMany($class, $link)
    {
        return $this->createRelationQuery($class, $link, true);
    }

    /**
     * Creates a query instance for `has-one` or `has-many` relation.
     * @param string $class the class name of the related record.
     * @param array $link the primary-foreign key constraint.
     * @param bool $multiple whether this query represents a relation to more than one record.
     * @return ActiveQueryInterface the relational query object.
     * @since 2.0.12
     * @see hasOne()
     * @see hasMany()
     */
    protected function createRelationQuery($class, $link, $multiple)
    {
        /* @var $class ActiveRecordInterface */
        /* @var $query ActiveQuery */
        $query = $class::find();
        $query->primaryModel = $this;
        $query->link = $link;
        $query->multiple = $multiple;
        return $query;
    }

    /**
     * Populates the named relation with the related records.
     * Note that this method does not check if the relation exists or not.
     * @param string $name the relation name, e.g. `orders` for a relation defined via `getOrders()` method (case-sensitive).
     * @param ActiveRecordInterface|array|null $records the related records to be populated into the relation.
     * @see getRelation()
     */
    public function populateRelation($name, $records)
    {
        foreach ($this->_relationsDependencies as &$relationNames) {
            unset($relationNames[$name]);
        }

        $this->_related[$name] = $records;
    }

    /**
     * Check whether the named relation has been populated with records.
     * @param string $name the relation name, e.g. `orders` for a relation defined via `getOrders()` method (case-sensitive).
     * @return bool whether relation has been populated with records.
     * @see getRelation()
     */
    public function isRelationPopulated($name)
    {
        return array_key_exists($name, $this->_related);
    }

    /**
     * Returns all populated related records.
     * @return array an array of related records indexed by relation names.
     * @see getRelation()
     */
    public function getRelatedRecords()
    {
        return $this->_related;
    }

    /**
     * Returns a value indicating whether the model has an attribute with the specified name.
     * @param string $name the name of the attribute
     * @return bool whether the model has an attribute with the specified name.
     */
    public function hasAttribute($name)
    {
        return isset($this->_attributes[$name]) || in_array($name, $this->attributes(), true);
    }

    /**
     * Returns the named attribute value.
     * If this record is the result of a query and the attribute is not loaded,
     * `null` will be returned.
     * @param string $name the attribute name
     * @return mixed the attribute value. `null` if the attribute is not set or does not exist.
     * @see hasAttribute()
     */
    public function getAttribute($name)
    {
        return isset($this->_attributes[$name]) ? $this->_attributes[$name] : null;
    }

    /**
     * Sets the named attribute value.
     * @param string $name the attribute name
     * @param mixed $value the attribute value.
     * @throws InvalidArgumentException if the named attribute does not exist.
     * @see hasAttribute()
     */
    public function setAttribute($name, $value)
    {
        if ($this->hasAttribute($name)) {
            if (
                !empty($this->_relationsDependencies[$name])
                && (!array_key_exists($name, $this->_attributes) || $this->_attributes[$name] !== $value)
            ) {
                $this->resetDependentRelations($name);
            }
            $this->_attributes[$name] = $value;
        } else {
            throw new InvalidArgumentException(get_class($this) . ' has no attribute named "' . $name . '".');
        }
    }

    /**
     * Returns the old attribute values.
     * @return array the old attribute values (name-value pairs)
     */
    public function getOldAttributes()
    {
        return $this->_oldAttributes === null ? [] : $this->_oldAttributes;
    }

    /**
     * Sets the old attribute values.
     * All existing old attribute values will be discarded.
     * @param array|null $values old attribute values to be set.
     * If set to `null` this record is considered to be [[isNewRecord|new]].
     */
    public function setOldAttributes($values)
    {
        $this->_oldAttributes = $values;
    }

    /**
     * Returns the old value of the named attribute.
     * If this record is the result of a query and the attribute is not loaded,
     * `null` will be returned.
     * @param string $name the attribute name
     * @return mixed the old attribute value. `null` if the attribute is not loaded before
     * or does not exist.
     * @see hasAttribute()
     */
    public function getOldAttribute($name)
    {
        return isset($this->_oldAttributes[$name]) ? $this->_oldAttributes[$name] : null;
    }

    /**
     * Sets the old value of the named attribute.
     * @param string $name the attribute name
     * @param mixed $value the old attribute value.
     * @throws InvalidArgumentException if the named attribute does not exist.
     * @see hasAttribute()
     */
    public function setOldAttribute($name, $value)
    {
        if (isset($this->_oldAttributes[$name]) || $this->hasAttribute($name)) {
            $this->_oldAttributes[$name] = $value;
        } else {
            throw new InvalidArgumentException(get_class($this) . ' has no attribute named "' . $name . '".');
        }
    }

    /**
     * Marks an attribute dirty.
     * This method may be called to force updating a record when calling [[update()]],
     * even if there is no change being made to the record.
     * @param string $name the attribute name
     */
    public function markAttributeDirty($name)
    {
        unset($this->_oldAttributes[$name]);
    }

    /**
     * Returns a value indicating whether the named attribute has been changed.
     * @param string $name the name of the attribute.
     * @param bool $identical whether the comparison of new and old value is made for
     * identical values using `===`, defaults to `true`. Otherwise `==` is used for comparison.
     * This parameter is available since version 2.0.4.
     * @return bool whether the attribute has been changed
     */
    public function isAttributeChanged($name, $identical = true)
    {
        if (isset($this->_attributes[$name], $this->_oldAttributes[$name])) {
            if ($identical) {
                return $this->_attributes[$name] !== $this->_oldAttributes[$name];
            }

            return $this->_attributes[$name] != $this->_oldAttributes[$name];
        }

        return isset($this->_attributes[$name]) || isset($this->_oldAttributes[$name]);
    }

    /**
     * Returns the attribute values that have been modified since they are loaded or saved most recently.
     *
     * The comparison of new and old values is made for identical values using `===`.
     *
     * @param string[]|null $names the names of the attributes whose values may be returned if they are
     * changed recently. If null, [[attributes()]] will be used.
     * @return array the changed attribute values (name-value pairs)
     */
    public function getDirtyAttributes($names = null)
    {
        if ($names === null) {
            $names = $this->attributes();
        }
        $names = array_flip($names);
        $attributes = [];
        if ($this->_oldAttributes === null) {
            foreach ($this->_attributes as $name => $value) {
                if (isset($names[$name])) {
                    $attributes[$name] = $value;
                }
            }
        } else {
            foreach ($this->_attributes as $name => $value) {
                if (isset($names[$name]) && (!array_key_exists($name, $this->_oldAttributes) || $value !== $this->_oldAttributes[$name])) {
                    $attributes[$name] = $value;
                }
            }
        }

        return $attributes;
    }

    /**
     * Saves the current record.
     *
     * This method will call [[insert()]] when [[isNewRecord]] is `true`, or [[update()]]
     * when [[isNewRecord]] is `false`.
     *
     * For example, to save a customer record:
     *
     * ```php
     * $customer = new Customer; // or $customer = Customer::findOne($id);
     * $customer->name = $name;
     * $customer->email = $email;
     * $customer->save();
     * ```
     *
     * @param bool $runValidation whether to perform validation (calling [[validate()]])
     * before saving the record. Defaults to `true`. If the validation fails, the record
     * will not be saved to the database and this method will return `false`.
     * @param array $attributeNames list of attribute names that need to be saved. Defaults to null,
     * meaning all attributes that are loaded from DB will be saved.
     * @return bool whether the saving succeeded (i.e. no validation errors occurred).
     */
    public function save($runValidation = true, $attributeNames = null)
    {
        if ($this->getIsNewRecord()) {
            return $this->insert($runValidation, $attributeNames);
        }

        return $this->update($runValidation, $attributeNames) !== false;
    }

    /**
     * Saves the changes to this active record into the associated database table.
     *
     * This method performs the following steps in order:
     *
     * 1. call [[beforeValidate()]] when `$runValidation` is `true`. If [[beforeValidate()]]
     *    returns `false`, the rest of the steps will be skipped;
     * 2. call [[afterValidate()]] when `$runValidation` is `true`. If validation
     *    failed, the rest of the steps will be skipped;
     * 3. call [[beforeSave()]]. If [[beforeSave()]] returns `false`,
     *    the rest of the steps will be skipped;
     * 4. save the record into database. If this fails, it will skip the rest of the steps;
     * 5. call [[afterSave()]];
     *
     * In the above step 1, 2, 3 and 5, events [[EVENT_BEFORE_VALIDATE]],
     * [[EVENT_AFTER_VALIDATE]], [[EVENT_BEFORE_UPDATE]], and [[EVENT_AFTER_UPDATE]]
     * will be raised by the corresponding methods.
     *
     * Only the [[dirtyAttributes|changed attribute values]] will be saved into database.
     *
     * For example, to update a customer record:
     *
     * ```php
     * $customer = Customer::findOne($id);
     * $customer->name = $name;
     * $customer->email = $email;
     * $customer->update();
     * ```
     *
     * Note that it is possible the update does not affect any row in the table.
     * In this case, this method will return 0. For this reason, you should use the following
     * code to check if update() is successful or not:
     *
     * ```php
     * if ($customer->update() !== false) {
     *     // update successful
     * } else {
     *     // update failed
     * }
     * ```
     *
     * @param bool $runValidation whether to perform validation (calling [[validate()]])
     * before saving the record. Defaults to `true`. If the validation fails, the record
     * will not be saved to the database and this method will return `false`.
     * @param array $attributeNames list of attribute names that need to be saved. Defaults to null,
     * meaning all attributes that are loaded from DB will be saved.
     * @return int|false the number of rows affected, or `false` if validation fails
     * or [[beforeSave()]] stops the updating process.
     * @throws StaleObjectException if [[optimisticLock|optimistic locking]] is enabled and the data
     * being updated is outdated.
     * @throws Exception in case update failed.
     */
    public function update($runValidation = true, $attributeNames = null)
    {
        if ($runValidation && !$this->validate($attributeNames)) {
            return false;
        }

        return $this->updateInternal($attributeNames);
    }

    /**
     * Updates the specified attributes.
     *
     * This method is a shortcut to [[update()]] when data validation is not needed
     * and only a small set attributes need to be updated.
     *
     * You may specify the attributes to be updated as name list or name-value pairs.
     * If the latter, the corresponding attribute values will be modified accordingly.
     * The method will then save the specified attributes into database.
     *
     * Note that this method will **not** perform data validation and will **not** trigger events.
     *
     * @param array $attributes the attributes (names or name-value pairs) to be updated
     * @return int the number of rows affected.
     */
    public function updateAttributes($attributes)
    {
        $attrs = [];
        foreach ($attributes as $name => $value) {
            if (is_int($name)) {
                $attrs[] = $value;
            } else {
                $this->$name = $value;
                $attrs[] = $name;
            }
        }

        $values = $this->getDirtyAttributes($attrs);
        if (empty($values) || $this->getIsNewRecord()) {
            return 0;
        }

        $rows = static::updateAll($values, $this->getOldPrimaryKey(true));

        foreach ($values as $name => $value) {
            $this->_oldAttributes[$name] = $this->_attributes[$name];
        }

        return $rows;
    }

    /**
     * @see update()
     * @param array $attributes attributes to update
     * @return int|false the number of rows affected, or false if [[beforeSave()]] stops the updating process.
     * @throws StaleObjectException
     */
    protected function updateInternal($attributes = null)
    {
        if (!$this->beforeSave(false)) {
            return false;
        }
        $values = $this->getDirtyAttributes($attributes);
        if (empty($values)) {
            $this->afterSave(false, $values);
            return 0;
        }
        $condition = $this->getOldPrimaryKey(true);
        $lock = $this->optimisticLock();
        if ($lock !== null) {
            $values[$lock] = $this->$lock + 1;
            $condition[$lock] = $this->$lock;
        }
        // We do not check the return value of updateAll() because it's possible
        // that the UPDATE statement doesn't change anything and thus returns 0.
        $rows = static::updateAll($values, $condition);

        if ($lock !== null && !$rows) {
            throw new StaleObjectException('The object being updated is outdated.');
        }

        if (isset($values[$lock])) {
            $this->$lock = $values[$lock];
        }

        $changedAttributes = [];
        foreach ($values as $name => $value) {
            $changedAttributes[$name] = isset($this->_oldAttributes[$name]) ? $this->_oldAttributes[$name] : null;
            $this->_oldAttributes[$name] = $value;
        }
        $this->afterSave(false, $changedAttributes);

        return $rows;
    }

    /**
     * Updates one or several counter columns for the current AR object.
     * Note that this method differs from [[updateAllCounters()]] in that it only
     * saves counters for the current AR object.
     *
     * An example usage is as follows:
     *
     * ```php
     * $post = Post::findOne($id);
     * $post->updateCounters(['view_count' => 1]);
     * ```
     *
     * @param array $counters the counters to be updated (attribute name => increment value)
     * Use negative values if you want to decrement the counters.
     * @return bool whether the saving is successful
     * @see updateAllCounters()
     */
    public function updateCounters($counters)
    {
        if (static::updateAllCounters($counters, $this->getOldPrimaryKey(true)) > 0) {
            foreach ($counters as $name => $value) {
                if (!isset($this->_attributes[$name])) {
                    $this->_attributes[$name] = $value;
                } else {
                    $this->_attributes[$name] += $value;
                }
                $this->_oldAttributes[$name] = $this->_attributes[$name];
            }

            return true;
        }

        return false;
    }

    /**
     * Deletes the table row corresponding to this active record.
     *
     * This method performs the following steps in order:
     *
     * 1. call [[beforeDelete()]]. If the method returns `false`, it will skip the
     *    rest of the steps;
     * 2. delete the record from the database;
     * 3. call [[afterDelete()]].
     *
     * In the above step 1 and 3, events named [[EVENT_BEFORE_DELETE]] and [[EVENT_AFTER_DELETE]]
     * will be raised by the corresponding methods.
     *
     * @return int|false the number of rows deleted, or `false` if the deletion is unsuccessful for some reason.
     * Note that it is possible the number of rows deleted is 0, even though the deletion execution is successful.
     * @throws StaleObjectException if [[optimisticLock|optimistic locking]] is enabled and the data
     * being deleted is outdated.
     * @throws Exception in case delete failed.
     */
    public function delete()
    {
        $result = false;
        if ($this->beforeDelete()) {
            // we do not check the return value of deleteAll() because it's possible
            // the record is already deleted in the database and thus the method will return 0
            $condition = $this->getOldPrimaryKey(true);
            $lock = $this->optimisticLock();
            if ($lock !== null) {
                $condition[$lock] = $this->$lock;
            }
            $result = static::deleteAll($condition);
            if ($lock !== null && !$result) {
                throw new StaleObjectException('The object being deleted is outdated.');
            }
            $this->_oldAttributes = null;
            $this->afterDelete();
        }

        return $result;
    }

    /**
     * Returns a value indicating whether the current record is new.
     * @return bool whether the record is new and should be inserted when calling [[save()]].
     */
    public function getIsNewRecord()
    {
        return $this->_oldAttributes === null;
    }

    /**
     * Sets the value indicating whether the record is new.
     * @param bool $value whether the record is new and should be inserted when calling [[save()]].
     * @see getIsNewRecord()
     */
    public function setIsNewRecord($value)
    {
        $this->_oldAttributes = $value ? null : $this->_attributes;
    }

    /**
     * Initializes the object.
     * This method is called at the end of the constructor.
     * The default implementation will trigger an [[EVENT_INIT]] event.
     */
    public function init()
    {
        parent::init();
        $this->trigger(self::EVENT_INIT);
    }

    /**
     * This method is called when the AR object is created and populated with the query result.
     * The default implementation will trigger an [[EVENT_AFTER_FIND]] event.
     * When overriding this method, make sure you call the parent implementation to ensure the
     * event is triggered.
     */
    public function afterFind()
    {
        $this->trigger(self::EVENT_AFTER_FIND);
    }

    /**
     * This method is called at the beginning of inserting or updating a record.
     *
     * The default implementation will trigger an [[EVENT_BEFORE_INSERT]] event when `$insert` is `true`,
     * or an [[EVENT_BEFORE_UPDATE]] event if `$insert` is `false`.
     * When overriding this method, make sure you call the parent implementation like the following:
     *
     * ```php
     * public function beforeSave($insert)
     * {
     *     if (!parent::beforeSave($insert)) {
     *         return false;
     *     }
     *
     *     // ...custom code here...
     *     return true;
     * }
     * ```
     *
     * @param bool $insert whether this method called while inserting a record.
     * If `false`, it means the method is called while updating a record.
     * @return bool whether the insertion or updating should continue.
     * If `false`, the insertion or updating will be cancelled.
     */
    public function beforeSave($insert)
    {
        $event = new ModelEvent();
        $this->trigger($insert ? self::EVENT_BEFORE_INSERT : self::EVENT_BEFORE_UPDATE, $event);

        return $event->isValid;
    }

    /**
     * This method is called at the end of inserting or updating a record.
     * The default implementation will trigger an [[EVENT_AFTER_INSERT]] event when `$insert` is `true`,
     * or an [[EVENT_AFTER_UPDATE]] event if `$insert` is `false`. The event class used is [[AfterSaveEvent]].
     * When overriding this method, make sure you call the parent implementation so that
     * the event is triggered.
     * @param bool $insert whether this method called while inserting a record.
     * If `false`, it means the method is called while updating a record.
     * @param array $changedAttributes The old values of attributes that had changed and were saved.
     * You can use this parameter to take action based on the changes made for example send an email
     * when the password had changed or implement audit trail that tracks all the changes.
     * `$changedAttributes` gives you the old attribute values while the active record (`$this`) has
     * already the new, updated values.
     *
     * Note that no automatic type conversion performed by default. You may use
     * [[\yii\behaviors\AttributeTypecastBehavior]] to facilitate attribute typecasting.
     * See http://www.yiiframework.com/doc-2.0/guide-db-active-record.html#attributes-typecasting.
     */
    public function afterSave($insert, $changedAttributes)
    {
        $this->trigger($insert ? self::EVENT_AFTER_INSERT : self::EVENT_AFTER_UPDATE, new AfterSaveEvent([
            'changedAttributes' => $changedAttributes,
        ]));
    }

    /**
     * This method is invoked before deleting a record.
     *
     * The default implementation raises the [[EVENT_BEFORE_DELETE]] event.
     * When overriding this method, make sure you call the parent implementation like the following:
     *
     * ```php
     * public function beforeDelete()
     * {
     *     if (!parent::beforeDelete()) {
     *         return false;
     *     }
     *
     *     // ...custom code here...
     *     return true;
     * }
     * ```
     *
     * @return bool whether the record should be deleted. Defaults to `true`.
     */
    public function beforeDelete()
    {
        $event = new ModelEvent();
        $this->trigger(self::EVENT_BEFORE_DELETE, $event);

        return $event->isValid;
    }

    /**
     * This method is invoked after deleting a record.
     * The default implementation raises the [[EVENT_AFTER_DELETE]] event.
     * You may override this method to do postprocessing after the record is deleted.
     * Make sure you call the parent implementation so that the event is raised properly.
     */
    public function afterDelete()
    {
        $this->trigger(self::EVENT_AFTER_DELETE);
    }

    /**
     * Repopulates this active record with the latest data.
     *
     * If the refresh is successful, an [[EVENT_AFTER_REFRESH]] event will be triggered.
     * This event is available since version 2.0.8.
     *
     * @return bool whether the row still exists in the database. If `true`, the latest data
     * will be populated to this active record. Otherwise, this record will remain unchanged.
     */
    public function refresh()
    {
        /* @var $record BaseActiveRecord */
        $record = static::findOne($this->getPrimaryKey(true));
        return $this->refreshInternal($record);
    }

    /**
     * Repopulates this active record with the latest data from a newly fetched instance.
     * @param BaseActiveRecord $record the record to take attributes from.
     * @return bool whether refresh was successful.
     * @see refresh()
     * @since 2.0.13
     */
    protected function refreshInternal($record)
    {
        if ($record === null) {
            return false;
        }
        foreach ($this->attributes() as $name) {
            $this->_attributes[$name] = isset($record->_attributes[$name]) ? $record->_attributes[$name] : null;
        }
        $this->_oldAttributes = $record->_oldAttributes;
        $this->_related = [];
        $this->_relationsDependencies = [];
        $this->afterRefresh();

        return true;
    }

    /**
     * This method is called when the AR object is refreshed.
     * The default implementation will trigger an [[EVENT_AFTER_REFRESH]] event.
     * When overriding this method, make sure you call the parent implementation to ensure the
     * event is triggered.
     * @since 2.0.8
     */
    public function afterRefresh()
    {
        $this->trigger(self::EVENT_AFTER_REFRESH);
    }

    /**
     * Returns a value indicating whether the given active record is the same as the current one.
     * The comparison is made by comparing the table names and the primary key values of the two active records.
     * If one of the records [[isNewRecord|is new]] they are also considered not equal.
     * @param ActiveRecordInterface $record record to compare to
     * @return bool whether the two active records refer to the same row in the same database table.
     */
    public function equals($record)
    {
        if ($this->getIsNewRecord() || $record->getIsNewRecord()) {
            return false;
        }

        return get_class($this) === get_class($record) && $this->getPrimaryKey() === $record->getPrimaryKey();
    }

    /**
     * Returns the primary key value(s).
     * @param bool $asArray whether to return the primary key value as an array. If `true`,
     * the return value will be an array with column names as keys and column values as values.
     * Note that for composite primary keys, an array will always be returned regardless of this parameter value.
     * @property mixed The primary key value. An array (column name => column value) is returned if
     * the primary key is composite. A string is returned otherwise (null will be returned if
     * the key value is null).
     * @return mixed the primary key value. An array (column name => column value) is returned if the primary key
     * is composite or `$asArray` is `true`. A string is returned otherwise (null will be returned if
     * the key value is null).
     */
    public function getPrimaryKey($asArray = false)
    {
        $keys = $this->primaryKey();
        if (!$asArray && count($keys) === 1) {
            return isset($this->_attributes[$keys[0]]) ? $this->_attributes[$keys[0]] : null;
        }

        $values = [];
        foreach ($keys as $name) {
            $values[$name] = isset($this->_attributes[$name]) ? $this->_attributes[$name] : null;
        }

        return $values;
    }

    /**
     * Returns the old primary key value(s).
     * This refers to the primary key value that is populated into the record
     * after executing a find method (e.g. find(), findOne()).
     * The value remains unchanged even if the primary key attribute is manually assigned with a different value.
     * @param bool $asArray whether to return the primary key value as an array. If `true`,
     * the return value will be an array with column name as key and column value as value.
     * If this is `false` (default), a scalar value will be returned for non-composite primary key.
     * @property mixed The old primary key value. An array (column name => column value) is
     * returned if the primary key is composite. A string is returned otherwise (null will be
     * returned if the key value is null).
     * @return mixed the old primary key value. An array (column name => column value) is returned if the primary key
     * is composite or `$asArray` is `true`. A string is returned otherwise (null will be returned if
     * the key value is null).
     * @throws Exception if the AR model does not have a primary key
     */
    public function getOldPrimaryKey($asArray = false)
    {
        $keys = $this->primaryKey();
        if (empty($keys)) {
            throw new Exception(get_class($this) . ' does not have a primary key. You should either define a primary key for the corresponding table or override the primaryKey() method.');
        }
        if (!$asArray && count($keys) === 1) {
            return isset($this->_oldAttributes[$keys[0]]) ? $this->_oldAttributes[$keys[0]] : null;
        }

        $values = [];
        foreach ($keys as $name) {
            $values[$name] = isset($this->_oldAttributes[$name]) ? $this->_oldAttributes[$name] : null;
        }

        return $values;
    }

    /**
     * Populates an active record object using a row of data from the database/storage.
     *
     * This is an internal method meant to be called to create active record objects after
     * fetching data from the database. It is mainly used by [[ActiveQuery]] to populate
     * the query results into active records.
     *
     * When calling this method manually you should call [[afterFind()]] on the created
     * record to trigger the [[EVENT_AFTER_FIND|afterFind Event]].
     *
     * @param BaseActiveRecord $record the record to be populated. In most cases this will be an instance
     * created by [[instantiate()]] beforehand.
     * @param array $row attribute values (name => value)
     */
    public static function populateRecord($record, $row)
    {
        $columns = array_flip($record->attributes());
        foreach ($row as $name => $value) {
            if (isset($columns[$name])) {
                $record->_attributes[$name] = $value;
            } elseif ($record->canSetProperty($name)) {
                $record->$name = $value;
            }
        }
        $record->_oldAttributes = $record->_attributes;
        $record->_related = [];
        $record->_relationsDependencies = [];
    }

    /**
     * Creates an active record instance.
     *
     * This method is called together with [[populateRecord()]] by [[ActiveQuery]].
     * It is not meant to be used for creating new records directly.
     *
     * You may override this method if the instance being created
     * depends on the row data to be populated into the record.
     * For example, by creating a record based on the value of a column,
     * you may implement the so-called single-table inheritance mapping.
     * @param array $row row data to be populated into the record.
     * @return static the newly created active record
     */
    public static function instantiate($row)
    {
        return new static();
    }

    /**
     * Returns whether there is an element at the specified offset.
     * This method is required by the interface [[\ArrayAccess]].
     * @param mixed $offset the offset to check on
     * @return bool whether there is an element at the specified offset.
     */
    public function offsetExists($offset)
    {
        return $this->__isset($offset);
    }

    /**
     * Returns the relation object with the specified name.
     * A relation is defined by a getter method which returns an [[ActiveQueryInterface]] object.
     * It can be declared in either the Active Record class itself or one of its behaviors.
     * @param string $name the relation name, e.g. `orders` for a relation defined via `getOrders()` method (case-sensitive).
     * @param bool $throwException whether to throw exception if the relation does not exist.
     * @return ActiveQueryInterface|ActiveQuery the relational query object. If the relation does not exist
     * and `$throwException` is `false`, `null` will be returned.
     * @throws InvalidArgumentException if the named relation does not exist.
     */
    public function getRelation($name, $throwException = true)
    {
        $getter = 'get' . $name;
        try {
            // the relation could be defined in a behavior
            $relation = $this->$getter();
        } catch (UnknownMethodException $e) {
            if ($throwException) {
                throw new InvalidArgumentException(get_class($this) . ' has no relation named "' . $name . '".', 0, $e);
            }

            return null;
        }
        if (!$relation instanceof ActiveQueryInterface) {
            if ($throwException) {
                throw new InvalidArgumentException(get_class($this) . ' has no relation named "' . $name . '".');
            }

            return null;
        }

        if (method_exists($this, $getter)) {
            // relation name is case sensitive, trying to validate it when the relation is defined within this class
            $method = new \ReflectionMethod($this, $getter);
            $realName = lcfirst(substr($method->getName(), 3));
            if ($realName !== $name) {
                if ($throwException) {
                    throw new InvalidArgumentException('Relation names are case sensitive. ' . get_class($this) . " has a relation named \"$realName\" instead of \"$name\".");
                }

                return null;
            }
        }

        return $relation;
    }

    /**
     * Establishes the relationship between two models.
     *
     * The relationship is established by setting the foreign key value(s) in one model
     * to be the corresponding primary key value(s) in the other model.
     * The model with the foreign key will be saved into database without performing validation.
     *
     * If the relationship involves a junction table, a new row will be inserted into the
     * junction table which contains the primary key values from both models.
     *
     * Note that this method requires that the primary key value is not null.
     *
     * @param string $name the case sensitive name of the relationship, e.g. `orders` for a relation defined via `getOrders()` method.
     * @param ActiveRecordInterface $model the model to be linked with the current one.
     * @param array $extraColumns additional column values to be saved into the junction table.
     * This parameter is only meaningful for a relationship involving a junction table
     * (i.e., a relation set with [[ActiveRelationTrait::via()]] or [[ActiveQuery::viaTable()]].)
     * @throws InvalidCallException if the method is unable to link two models.
     */
    public function link($name, $model, $extraColumns = [])
    {
        $relation = $this->getRelation($name);

        if ($relation->via !== null) {
            if ($this->getIsNewRecord() || $model->getIsNewRecord()) {
                throw new InvalidCallException('Unable to link models: the models being linked cannot be newly created.');
            }
            if (is_array($relation->via)) {
                /* @var $viaRelation ActiveQuery */
                list($viaName, $viaRelation) = $relation->via;
                $viaClass = $viaRelation->modelClass;
                // unset $viaName so that it can be reloaded to reflect the change
                unset($this->_related[$viaName]);
            } else {
                $viaRelation = $relation->via;
                $viaTable = reset($relation->via->from);
            }
            $columns = [];
            foreach ($viaRelation->link as $a => $b) {
                $columns[$a] = $this->$b;
            }
            foreach ($relation->link as $a => $b) {
                $columns[$b] = $model->$a;
            }
            foreach ($extraColumns as $k => $v) {
                $columns[$k] = $v;
            }
            if (is_array($relation->via)) {
                /* @var $viaClass ActiveRecordInterface */
                /* @var $record ActiveRecordInterface */
                $record = Yii::createObject($viaClass);
                foreach ($columns as $column => $value) {
                    $record->$column = $value;
                }
                $record->insert(false);
            } else {
                /* @var $viaTable string */
                static::getDb()->createCommand()
                    ->insert($viaTable, $columns)->execute();
            }
        } else {
            $p1 = $model->isPrimaryKey(array_keys($relation->link));
            $p2 = static::isPrimaryKey(array_values($relation->link));
            if ($p1 && $p2) {
                if ($this->getIsNewRecord() && $model->getIsNewRecord()) {
                    throw new InvalidCallException('Unable to link models: at most one model can be newly created.');
                } elseif ($this->getIsNewRecord()) {
                    $this->bindModels(array_flip($relation->link), $this, $model);
                } else {
                    $this->bindModels($relation->link, $model, $this);
                }
            } elseif ($p1) {
                $this->bindModels(array_flip($relation->link), $this, $model);
            } elseif ($p2) {
                $this->bindModels($relation->link, $model, $this);
            } else {
                throw new InvalidCallException('Unable to link models: the link defining the relation does not involve any primary key.');
            }
        }

        // update lazily loaded related objects
        if (!$relation->multiple) {
            $this->_related[$name] = $model;
        } elseif (isset($this->_related[$name])) {
            if ($relation->indexBy !== null) {
                if ($relation->indexBy instanceof \Closure) {
                    $index = call_user_func($relation->indexBy, $model);
                } else {
                    $index = $model->{$relation->indexBy};
                }
                $this->_related[$name][$index] = $model;
            } else {
                $this->_related[$name][] = $model;
            }
        }
    }

    /**
     * Destroys the relationship between two models.
     *
     * The model with the foreign key of the relationship will be deleted if `$delete` is `true`.
     * Otherwise, the foreign key will be set `null` and the model will be saved without validation.
     *
     * @param string $name the case sensitive name of the relationship, e.g. `orders` for a relation defined via `getOrders()` method.
     * @param ActiveRecordInterface $model the model to be unlinked from the current one.
     * You have to make sure that the model is really related with the current model as this method
     * does not check this.
     * @param bool $delete whether to delete the model that contains the foreign key.
     * If `false`, the model's foreign key will be set `null` and saved.
     * If `true`, the model containing the foreign key will be deleted.
     * @throws InvalidCallException if the models cannot be unlinked
     */
    public function unlink($name, $model, $delete = false)
    {
        $relation = $this->getRelation($name);

        if ($relation->via !== null) {
            if (is_array($relation->via)) {
                /* @var $viaRelation ActiveQuery */
                list($viaName, $viaRelation) = $relation->via;
                $viaClass = $viaRelation->modelClass;
                unset($this->_related[$viaName]);
            } else {
                $viaRelation = $relation->via;
                $viaTable = reset($relation->via->from);
            }
            $columns = [];
            foreach ($viaRelation->link as $a => $b) {
                $columns[$a] = $this->$b;
            }
            foreach ($relation->link as $a => $b) {
                $columns[$b] = $model->$a;
            }
            $nulls = [];
            foreach (array_keys($columns) as $a) {
                $nulls[$a] = null;
            }
            if (is_array($relation->via)) {
                /* @var $viaClass ActiveRecordInterface */
                if ($delete) {
                    $viaClass::deleteAll($columns);
                } else {
                    $viaClass::updateAll($nulls, $columns);
                }
            } else {
                /* @var $viaTable string */
                /* @var $command Command */
                $command = static::getDb()->createCommand();
                if ($delete) {
                    $command->delete($viaTable, $columns)->execute();
                } else {
                    $command->update($viaTable, $nulls, $columns)->execute();
                }
            }
        } else {
            $p1 = $model->isPrimaryKey(array_keys($relation->link));
            $p2 = static::isPrimaryKey(array_values($relation->link));
            if ($p2) {
                if ($delete) {
                    $model->delete();
                } else {
                    foreach ($relation->link as $a => $b) {
                        $model->$a = null;
                    }
                    $model->save(false);
                }
            } elseif ($p1) {
                foreach ($relation->link as $a => $b) {
                    if (is_array($this->$b)) { // relation via array valued attribute
                        if (($key = array_search($model->$a, $this->$b, false)) !== false) {
                            $values = $this->$b;
                            unset($values[$key]);
                            $this->$b = array_values($values);
                        }
                    } else {
                        $this->$b = null;
                    }
                }
                $delete ? $this->delete() : $this->save(false);
            } else {
                throw new InvalidCallException('Unable to unlink models: the link does not involve any primary key.');
            }
        }

        if (!$relation->multiple) {
            unset($this->_related[$name]);
        } elseif (isset($this->_related[$name])) {
            /* @var $b ActiveRecordInterface */
            foreach ($this->_related[$name] as $a => $b) {
                if ($model->getPrimaryKey() === $b->getPrimaryKey()) {
                    unset($this->_related[$name][$a]);
                }
            }
        }
    }

    /**
     * Destroys the relationship in current model.
     *
     * The model with the foreign key of the relationship will be deleted if `$delete` is `true`.
     * Otherwise, the foreign key will be set `null` and the model will be saved without validation.
     *
     * Note that to destroy the relationship without removing records make sure your keys can be set to null
     *
     * @param string $name the case sensitive name of the relationship, e.g. `orders` for a relation defined via `getOrders()` method.
     * @param bool $delete whether to delete the model that contains the foreign key.
     *
     * Note that the deletion will be performed using [[deleteAll()]], which will not trigger any events on the related models.
     * If you need [[EVENT_BEFORE_DELETE]] or [[EVENT_AFTER_DELETE]] to be triggered, you need to [[find()|find]] the models first
     * and then call [[delete()]] on each of them.
     */
    public function unlinkAll($name, $delete = false)
    {
        $relation = $this->getRelation($name);

        if ($relation->via !== null) {
            if (is_array($relation->via)) {
                /* @var $viaRelation ActiveQuery */
                list($viaName, $viaRelation) = $relation->via;
                $viaClass = $viaRelation->modelClass;
                unset($this->_related[$viaName]);
            } else {
                $viaRelation = $relation->via;
                $viaTable = reset($relation->via->from);
            }
            $condition = [];
            $nulls = [];
            foreach ($viaRelation->link as $a => $b) {
                $nulls[$a] = null;
                $condition[$a] = $this->$b;
            }
            if (!empty($viaRelation->where)) {
                $condition = ['and', $condition, $viaRelation->where];
            }
            if (!empty($viaRelation->on)) {
                $condition = ['and', $condition, $viaRelation->on];
            }
            if (is_array($relation->via)) {
                /* @var $viaClass ActiveRecordInterface */
                if ($delete) {
                    $viaClass::deleteAll($condition);
                } else {
                    $viaClass::updateAll($nulls, $condition);
                }
            } else {
                /* @var $viaTable string */
                /* @var $command Command */
                $command = static::getDb()->createCommand();
                if ($delete) {
                    $command->delete($viaTable, $condition)->execute();
                } else {
                    $command->update($viaTable, $nulls, $condition)->execute();
                }
            }
        } else {
            /* @var $relatedModel ActiveRecordInterface */
            $relatedModel = $relation->modelClass;
            if (!$delete && count($relation->link) === 1 && is_array($this->{$b = reset($relation->link)})) {
                // relation via array valued attribute
                $this->$b = [];
                $this->save(false);
            } else {
                $nulls = [];
                $condition = [];
                foreach ($relation->link as $a => $b) {
                    $nulls[$a] = null;
                    $condition[$a] = $this->$b;
                }
                if (!empty($relation->where)) {
                    $condition = ['and', $condition, $relation->where];
                }
                if (!empty($relation->on)) {
                    $condition = ['and', $condition, $relation->on];
                }
                if ($delete) {
                    $relatedModel::deleteAll($condition);
                } else {
                    $relatedModel::updateAll($nulls, $condition);
                }
            }
        }

        unset($this->_related[$name]);
    }

    /**
     * @param array $link
     * @param ActiveRecordInterface $foreignModel
     * @param ActiveRecordInterface $primaryModel
     * @throws InvalidCallException
     */
    private function bindModels($link, $foreignModel, $primaryModel)
    {
        foreach ($link as $fk => $pk) {
            $value = $primaryModel->$pk;
            if ($value === null) {
                throw new InvalidCallException('Unable to link models: the primary key of ' . get_class($primaryModel) . ' is null.');
            }
            if (is_array($foreignModel->$fk)) { // relation via array valued attribute
                $foreignModel->{$fk}[] = $value;
            } else {
                $foreignModel->{$fk} = $value;
            }
        }
        $foreignModel->save(false);
    }

    /**
     * Returns a value indicating whether the given set of attributes represents the primary key for this model.
     * @param array $keys the set of attributes to check
     * @return bool whether the given set of attributes represents the primary key for this model
     */
    public static function isPrimaryKey($keys)
    {
        $pks = static::primaryKey();
        if (count($keys) === count($pks)) {
            return count(array_intersect($keys, $pks)) === count($pks);
        }

        return false;
    }

    /**
     * Returns the text label for the specified attribute.
     * If the attribute looks like `relatedModel.attribute`, then the attribute will be received from the related model.
     * @param string $attribute the attribute name
     * @return string the attribute label
     * @see generateAttributeLabel()
     * @see attributeLabels()
     */
    public function getAttributeLabel($attribute)
    {
        $labels = $this->attributeLabels();
        if (isset($labels[$attribute])) {
            return $labels[$attribute];
        } elseif (strpos($attribute, '.')) {
            $attributeParts = explode('.', $attribute);
            $neededAttribute = array_pop($attributeParts);

            $relatedModel = $this;
            foreach ($attributeParts as $relationName) {
                if ($relatedModel->isRelationPopulated($relationName) && $relatedModel->$relationName instanceof self) {
                    $relatedModel = $relatedModel->$relationName;
                } else {
                    try {
                        $relation = $relatedModel->getRelation($relationName);
                    } catch (InvalidParamException $e) {
                        return $this->generateAttributeLabel($attribute);
                    }
                    /* @var $modelClass ActiveRecordInterface */
                    $modelClass = $relation->modelClass;
                    $relatedModel = $modelClass::instance();
                }
            }

            $labels = $relatedModel->attributeLabels();
            if (isset($labels[$neededAttribute])) {
                return $labels[$neededAttribute];
            }
        }

        return $this->generateAttributeLabel($attribute);
    }

    /**
     * Returns the text hint for the specified attribute.
     * If the attribute looks like `relatedModel.attribute`, then the attribute will be received from the related model.
     * @param string $attribute the attribute name
     * @return string the attribute hint
     * @see attributeHints()
     * @since 2.0.4
     */
    public function getAttributeHint($attribute)
    {
        $hints = $this->attributeHints();
        if (isset($hints[$attribute])) {
            return $hints[$attribute];
        } elseif (strpos($attribute, '.')) {
            $attributeParts = explode('.', $attribute);
            $neededAttribute = array_pop($attributeParts);

            $relatedModel = $this;
            foreach ($attributeParts as $relationName) {
                if ($relatedModel->isRelationPopulated($relationName) && $relatedModel->$relationName instanceof self) {
                    $relatedModel = $relatedModel->$relationName;
                } else {
                    try {
                        $relation = $relatedModel->getRelation($relationName);
                    } catch (InvalidParamException $e) {
                        return '';
                    }
                    /* @var $modelClass ActiveRecordInterface */
                    $modelClass = $relation->modelClass;
                    $relatedModel = $modelClass::instance();
                }
            }

            $hints = $relatedModel->attributeHints();
            if (isset($hints[$neededAttribute])) {
                return $hints[$neededAttribute];
            }
        }

        return '';
    }

    /**
     * {@inheritdoc}
     *
     * The default implementation returns the names of the columns whose values have been populated into this record.
     */
    public function fields()
    {
        $fields = array_keys($this->_attributes);

        return array_combine($fields, $fields);
    }

    /**
     * {@inheritdoc}
     *
     * The default implementation returns the names of the relations that have been populated into this record.
     */
    public function extraFields()
    {
        $fields = array_keys($this->getRelatedRecords());

        return array_combine($fields, $fields);
    }

    /**
     * Sets the element value at the specified offset to null.
     * This method is required by the SPL interface [[\ArrayAccess]].
     * It is implicitly called when you use something like `unset($model[$offset])`.
     * @param mixed $offset the offset to unset element
     */
    public function offsetUnset($offset)
    {
        if (property_exists($this, $offset)) {
            $this->$offset = null;
        } else {
            unset($this->$offset);
        }
    }

    /**
     * Resets dependent related models checking if their links contain specific attribute.
     * @param string $attribute The changed attribute name.
     */
    private function resetDependentRelations($attribute)
    {
        foreach ($this->_relationsDependencies[$attribute] as $relation) {
            unset($this->_related[$relation]);
        }
        unset($this->_relationsDependencies[$attribute]);
    }

    /**
     * Sets relation dependencies for a property
     * @param string $name property name
     * @param ActiveQueryInterface $relation relation instance
     * @param string|null $viaRelationName intermediate relation
     */
    private function setRelationDependencies($name, $relation, $viaRelationName = null)
    {
        if (empty($relation->via) && $relation->link) {
            foreach ($relation->link as $attribute) {
                $this->_relationsDependencies[$attribute][$name] = $name;
                if ($viaRelationName !== null) {
                    $this->_relationsDependencies[$attribute][] = $viaRelationName;
                }
            }
        } elseif ($relation->via instanceof ActiveQueryInterface) {
            $this->setRelationDependencies($name, $relation->via);
        } elseif (is_array($relation->via)) {
            list($viaRelationName, $viaQuery) = $relation->via;
            $this->setRelationDependencies($name, $viaQuery, $viaRelationName);
        }
    }
}


<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\validators;

use Yii;
use yii\helpers\FileHelper;
use yii\helpers\Html;
use yii\helpers\Json;
use yii\web\JsExpression;
use yii\web\UploadedFile;

/**
 * FileValidator verifies if an attribute is receiving a valid uploaded file.
 *
 * Note that you should enable `fileinfo` PHP extension.
 *
 * @property int $sizeLimit The size limit for uploaded files. This property is read-only.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class FileValidator extends Validator
{
    /**
     * @var array|string a list of file name extensions that are allowed to be uploaded.
     * This can be either an array or a string consisting of file extension names
     * separated by space or comma (e.g. "gif, jpg").
     * Extension names are case-insensitive. Defaults to null, meaning all file name
     * extensions are allowed.
     * @see wrongExtension for the customized message for wrong file type.
     */
    public $extensions;
    /**
     * @var bool whether to check file type (extension) with mime-type. If extension produced by
     * file mime-type check differs from uploaded file extension, the file will be considered as invalid.
     */
    public $checkExtensionByMimeType = true;
    /**
     * @var array|string a list of file MIME types that are allowed to be uploaded.
     * This can be either an array or a string consisting of file MIME types
     * separated by space or comma (e.g. "text/plain, image/png").
     * The mask with the special character `*` can be used to match groups of mime types.
     * For example `image/*` will pass all mime types, that begin with `image/` (e.g. `image/jpeg`, `image/png`).
     * Mime type names are case-insensitive. Defaults to null, meaning all MIME types are allowed.
     * @see wrongMimeType for the customized message for wrong MIME type.
     */
    public $mimeTypes;
    /**
     * @var int the minimum number of bytes required for the uploaded file.
     * Defaults to null, meaning no limit.
     * @see tooSmall for the customized message for a file that is too small.
     */
    public $minSize;
    /**
     * @var int the maximum number of bytes required for the uploaded file.
     * Defaults to null, meaning no limit.
     * Note, the size limit is also affected by `upload_max_filesize` and `post_max_size` INI setting
     * and the 'MAX_FILE_SIZE' hidden field value. See [[getSizeLimit()]] for details.
     * @see https://secure.php.net/manual/en/ini.core.php#ini.upload-max-filesize
     * @see https://secure.php.net/post-max-size
     * @see getSizeLimit
     * @see tooBig for the customized message for a file that is too big.
     */
    public $maxSize;
    /**
     * @var int the maximum file count the given attribute can hold.
     * Defaults to 1, meaning single file upload. By defining a higher number,
     * multiple uploads become possible. Setting it to `0` means there is no limit on
     * the number of files that can be uploaded simultaneously.
     *
     * > Note: The maximum number of files allowed to be uploaded simultaneously is
     * also limited with PHP directive `max_file_uploads`, which defaults to 20.
     *
     * @see https://secure.php.net/manual/en/ini.core.php#ini.max-file-uploads
     * @see tooMany for the customized message when too many files are uploaded.
     */
    public $maxFiles = 1;
    /**
     * @var int the minimum file count the given attribute can hold.
     * Defaults to 0. Higher value means at least that number of files should be uploaded.
     *
     * @see tooFew for the customized message when too few files are uploaded.
     * @since 2.0.14
     */
    public $minFiles = 0;
    /**
     * @var string the error message used when a file is not uploaded correctly.
     */
    public $message;
    /**
     * @var string the error message used when no file is uploaded.
     * Note that this is the text of the validation error message. To make uploading files required,
     * you have to set [[skipOnEmpty]] to `false`.
     */
    public $uploadRequired;
    /**
     * @var string the error message used when the uploaded file is too large.
     * You may use the following tokens in the message:
     *
     * - {attribute}: the attribute name
     * - {file}: the uploaded file name
     * - {limit}: the maximum size allowed (see [[getSizeLimit()]])
     * - {formattedLimit}: the maximum size formatted
     *   with [[\yii\i18n\Formatter::asShortSize()|Formatter::asShortSize()]]
     */
    public $tooBig;
    /**
     * @var string the error message used when the uploaded file is too small.
     * You may use the following tokens in the message:
     *
     * - {attribute}: the attribute name
     * - {file}: the uploaded file name
     * - {limit}: the value of [[minSize]]
     * - {formattedLimit}: the value of [[minSize]] formatted
     *   with [[\yii\i18n\Formatter::asShortSize()|Formatter::asShortSize()]
     */
    public $tooSmall;
    /**
     * @var string the error message used if the count of multiple uploads exceeds limit.
     * You may use the following tokens in the message:
     *
     * - {attribute}: the attribute name
     * - {limit}: the value of [[maxFiles]]
     */
    public $tooMany;
    /**
     * @var string the error message used if the count of multiple uploads less that minFiles.
     * You may use the following tokens in the message:
     *
     * - {attribute}: the attribute name
     * - {limit}: the value of [[minFiles]]
     *
     * @since 2.0.14
     */
    public $tooFew;
    /**
     * @var string the error message used when the uploaded file has an extension name
     * that is not listed in [[extensions]]. You may use the following tokens in the message:
     *
     * - {attribute}: the attribute name
     * - {file}: the uploaded file name
     * - {extensions}: the list of the allowed extensions.
     */
    public $wrongExtension;
    /**
     * @var string the error message used when the file has an mime type
     * that is not allowed by [[mimeTypes]] property.
     * You may use the following tokens in the message:
     *
     * - {attribute}: the attribute name
     * - {file}: the uploaded file name
     * - {mimeTypes}: the value of [[mimeTypes]]
     */
    public $wrongMimeType;

    /**
     * {@inheritdoc}
     */
    public function init()
    {
        parent::init();
        if ($this->message === null) {
            $this->message = Yii::t('yii', 'File upload failed.');
        }
        if ($this->uploadRequired === null) {
            $this->uploadRequired = Yii::t('yii', 'Please upload a file.');
        }
        if ($this->tooMany === null) {
            $this->tooMany = Yii::t('yii', 'You can upload at most {limit, number} {limit, plural, one{file} other{files}}.');
        }
        if ($this->tooFew === null) {
            $this->tooFew = Yii::t('yii', 'You should upload at least {limit, number} {limit, plural, one{file} other{files}}.');
        }
        if ($this->wrongExtension === null) {
            $this->wrongExtension = Yii::t('yii', 'Only files with these extensions are allowed: {extensions}.');
        }
        if ($this->tooBig === null) {
            $this->tooBig = Yii::t('yii', 'The file "{file}" is too big. Its size cannot exceed {formattedLimit}.');
        }
        if ($this->tooSmall === null) {
            $this->tooSmall = Yii::t('yii', 'The file "{file}" is too small. Its size cannot be smaller than {formattedLimit}.');
        }
        if (!is_array($this->extensions)) {
            $this->extensions = preg_split('/[\s,]+/', strtolower($this->extensions), -1, PREG_SPLIT_NO_EMPTY);
        } else {
            $this->extensions = array_map('strtolower', $this->extensions);
        }
        if ($this->wrongMimeType === null) {
            $this->wrongMimeType = Yii::t('yii', 'Only files with these MIME types are allowed: {mimeTypes}.');
        }
        if (!is_array($this->mimeTypes)) {
            $this->mimeTypes = preg_split('/[\s,]+/', strtolower($this->mimeTypes), -1, PREG_SPLIT_NO_EMPTY);
        } else {
            $this->mimeTypes = array_map('strtolower', $this->mimeTypes);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function validateAttribute($model, $attribute)
    {
        if ($this->maxFiles != 1 || $this->minFiles > 1) {
            $rawFiles = $model->$attribute;
            if (!is_array($rawFiles)) {
                $this->addError($model, $attribute, $this->uploadRequired);

                return;
            }

            $files = $this->filterFiles($rawFiles);
            $model->$attribute = $files;

            if (empty($files)) {
                $this->addError($model, $attribute, $this->uploadRequired);

                return;
            }

            $filesCount = count($files);
            if ($this->maxFiles && $filesCount > $this->maxFiles) {
                $this->addError($model, $attribute, $this->tooMany, ['limit' => $this->maxFiles]);
            }

            if ($this->minFiles && $this->minFiles > $filesCount) {
                $this->addError($model, $attribute, $this->tooFew, ['limit' => $this->minFiles]);
            }

            foreach ($files as $file) {
                $result = $this->validateValue($file);
                if (!empty($result)) {
                    $this->addError($model, $attribute, $result[0], $result[1]);
                }
            }
        } else {
            $result = $this->validateValue($model->$attribute);
            if (!empty($result)) {
                $this->addError($model, $attribute, $result[0], $result[1]);
            }
        }
    }

    /**
     * Files filter.
     * @param array $files
     * @return UploadedFile[]
     */
    private function filterFiles(array $files)
    {
        $result = [];

        foreach ($files as $fileName => $file) {
            if ($file instanceof UploadedFile && $file->error !== UPLOAD_ERR_NO_FILE) {
                $result[$fileName] = $file;
            }
        }

        return $result;
    }

    /**
     * {@inheritdoc}
     */
    protected function validateValue($value)
    {
        if (!$value instanceof UploadedFile || $value->error == UPLOAD_ERR_NO_FILE) {
            return [$this->uploadRequired, []];
        }

        switch ($value->error) {
            case UPLOAD_ERR_OK:
                if ($this->maxSize !== null && $value->size > $this->getSizeLimit()) {
                    return [
                        $this->tooBig,
                        [
                            'file' => $value->name,
                            'limit' => $this->getSizeLimit(),
                            'formattedLimit' => Yii::$app->formatter->asShortSize($this->getSizeLimit()),
                        ],
                    ];
                } elseif ($this->minSize !== null && $value->size < $this->minSize) {
                    return [
                        $this->tooSmall,
                        [
                            'file' => $value->name,
                            'limit' => $this->minSize,
                            'formattedLimit' => Yii::$app->formatter->asShortSize($this->minSize),
                        ],
                    ];
                } elseif (!empty($this->extensions) && !$this->validateExtension($value)) {
                    return [$this->wrongExtension, ['file' => $value->name, 'extensions' => implode(', ', $this->extensions)]];
                } elseif (!empty($this->mimeTypes) && !$this->validateMimeType($value)) {
                    return [$this->wrongMimeType, ['file' => $value->name, 'mimeTypes' => implode(', ', $this->mimeTypes)]];
                }

                return null;
            case UPLOAD_ERR_INI_SIZE:
            case UPLOAD_ERR_FORM_SIZE:
                return [$this->tooBig, [
                    'file' => $value->name,
                    'limit' => $this->getSizeLimit(),
                    'formattedLimit' => Yii::$app->formatter->asShortSize($this->getSizeLimit()),
                ]];
            case UPLOAD_ERR_PARTIAL:
                Yii::warning('File was only partially uploaded: ' . $value->name, __METHOD__);
                break;
            case UPLOAD_ERR_NO_TMP_DIR:
                Yii::warning('Missing the temporary folder to store the uploaded file: ' . $value->name, __METHOD__);
                break;
            case UPLOAD_ERR_CANT_WRITE:
                Yii::warning('Failed to write the uploaded file to disk: ' . $value->name, __METHOD__);
                break;
            case UPLOAD_ERR_EXTENSION:
                Yii::warning('File upload was stopped by some PHP extension: ' . $value->name, __METHOD__);
                break;
            default:
                break;
        }

        return [$this->message, []];
    }

    /**
     * Returns the maximum size allowed for uploaded files.
     *
     * This is determined based on four factors:
     *
     * - 'upload_max_filesize' in php.ini
     * - 'post_max_size' in php.ini
     * - 'MAX_FILE_SIZE' hidden field
     * - [[maxSize]]
     *
     * @return int the size limit for uploaded files.
     */
    public function getSizeLimit()
    {
        // Get the lowest between post_max_size and upload_max_filesize, log a warning if the first is < than the latter
        $limit = $this->sizeToBytes(ini_get('upload_max_filesize'));
        $postLimit = $this->sizeToBytes(ini_get('post_max_size'));
        if ($postLimit > 0 && $postLimit < $limit) {
            Yii::warning('PHP.ini\'s \'post_max_size\' is less than \'upload_max_filesize\'.', __METHOD__);
            $limit = $postLimit;
        }
        if ($this->maxSize !== null && $limit > 0 && $this->maxSize < $limit) {
            $limit = $this->maxSize;
        }
        if (isset($_POST['MAX_FILE_SIZE']) && $_POST['MAX_FILE_SIZE'] > 0 && $_POST['MAX_FILE_SIZE'] < $limit) {
            $limit = (int) $_POST['MAX_FILE_SIZE'];
        }

        return $limit;
    }

    /**
     * {@inheritdoc}
     * @param bool $trim
     */
    public function isEmpty($value, $trim = false)
    {
        $value = is_array($value) ? reset($value) : $value;
        return !($value instanceof UploadedFile) || $value->error == UPLOAD_ERR_NO_FILE;
    }

    /**
     * Converts php.ini style size to bytes.
     *
     * @param string $sizeStr $sizeStr
     * @return int
     */
    private function sizeToBytes($sizeStr)
    {
        switch (substr($sizeStr, -1)) {
            case 'M':
            case 'm':
                return (int) $sizeStr * 1048576;
            case 'K':
            case 'k':
                return (int) $sizeStr * 1024;
            case 'G':
            case 'g':
                return (int) $sizeStr * 1073741824;
            default:
                return (int) $sizeStr;
        }
    }

    /**
     * Checks if given uploaded file have correct type (extension) according current validator settings.
     * @param UploadedFile $file
     * @return bool
     */
    protected function validateExtension($file)
    {
        $extension = mb_strtolower($file->extension, 'UTF-8');

        if ($this->checkExtensionByMimeType) {
            $mimeType = FileHelper::getMimeType($file->tempName, null, false);
            if ($mimeType === null) {
                return false;
            }

            $extensionsByMimeType = FileHelper::getExtensionsByMimeType($mimeType);

            if (!in_array($extension, $extensionsByMimeType, true)) {
                return false;
            }
        }

        if (!in_array($extension, $this->extensions, true)) {
            return false;
        }

        return true;
    }

    /**
     * {@inheritdoc}
     */
    public function clientValidateAttribute($model, $attribute, $view)
    {
        ValidationAsset::register($view);
        $options = $this->getClientOptions($model, $attribute);
        return 'yii.validation.file(attribute, messages, ' . Json::encode($options) . ');';
    }

    /**
     * {@inheritdoc}
     */
    public function getClientOptions($model, $attribute)
    {
        $label = $model->getAttributeLabel($attribute);

        $options = [];
        if ($this->message !== null) {
            $options['message'] = $this->formatMessage($this->message, [
                'attribute' => $label,
            ]);
        }

        $options['skipOnEmpty'] = $this->skipOnEmpty;

        if (!$this->skipOnEmpty) {
            $options['uploadRequired'] = $this->formatMessage($this->uploadRequired, [
                'attribute' => $label,
            ]);
        }

        if ($this->mimeTypes !== null) {
            $mimeTypes = [];
            foreach ($this->mimeTypes as $mimeType) {
                $mimeTypes[] = new JsExpression(Html::escapeJsRegularExpression($this->buildMimeTypeRegexp($mimeType)));
            }
            $options['mimeTypes'] = $mimeTypes;
            $options['wrongMimeType'] = $this->formatMessage($this->wrongMimeType, [
                'attribute' => $label,
                'mimeTypes' => implode(', ', $this->mimeTypes),
            ]);
        }

        if ($this->extensions !== null) {
            $options['extensions'] = $this->extensions;
            $options['wrongExtension'] = $this->formatMessage($this->wrongExtension, [
                'attribute' => $label,
                'extensions' => implode(', ', $this->extensions),
            ]);
        }

        if ($this->minSize !== null) {
            $options['minSize'] = $this->minSize;
            $options['tooSmall'] = $this->formatMessage($this->tooSmall, [
                'attribute' => $label,
                'limit' => $this->minSize,
                'formattedLimit' => Yii::$app->formatter->asShortSize($this->minSize),
            ]);
        }

        if ($this->maxSize !== null) {
            $options['maxSize'] = $this->maxSize;
            $options['tooBig'] = $this->formatMessage($this->tooBig, [
                'attribute' => $label,
                'limit' => $this->getSizeLimit(),
                'formattedLimit' => Yii::$app->formatter->asShortSize($this->getSizeLimit()),
            ]);
        }

        if ($this->maxFiles !== null) {
            $options['maxFiles'] = $this->maxFiles;
            $options['tooMany'] = $this->formatMessage($this->tooMany, [
                'attribute' => $label,
                'limit' => $this->maxFiles,
            ]);
        }

        return $options;
    }

    /**
     * Builds the RegExp from the $mask.
     *
     * @param string $mask
     * @return string the regular expression
     * @see mimeTypes
     */
    private function buildMimeTypeRegexp($mask)
    {
        return '/^' . str_replace('\*', '.*', preg_quote($mask, '/')) . '$/';
    }

    /**
     * Checks the mimeType of the $file against the list in the [[mimeTypes]] property.
     *
     * @param UploadedFile $file
     * @return bool whether the $file mimeType is allowed
     * @throws \yii\base\InvalidConfigException
     * @see mimeTypes
     * @since 2.0.8
     */
    protected function validateMimeType($file)
    {
        $fileMimeType = FileHelper::getMimeType($file->tempName);

        foreach ($this->mimeTypes as $mimeType) {
            if ($mimeType === $fileMimeType) {
                return true;
            }

            if (strpos($mimeType, '*') !== false && preg_match($this->buildMimeTypeRegexp($mimeType), $fileMimeType)) {
                return true;
            }
        }

        return false;
    }
}


<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\rest;

use Yii;
use yii\base\InvalidConfigException;
use yii\helpers\Inflector;
use yii\web\CompositeUrlRule;
use yii\web\UrlRule as WebUrlRule;
use yii\web\UrlRuleInterface;

/**
 * UrlRule is provided to simplify the creation of URL rules for RESTful API support.
 *
 * The simplest usage of UrlRule is to declare a rule like the following in the application configuration,
 *
 * ```php
 * [
 *     'class' => 'yii\rest\UrlRule',
 *     'controller' => 'user',
 * ]
 * ```
 *
 * The above code will create a whole set of URL rules supporting the following RESTful API endpoints:
 *
 * - `'PUT,PATCH users/<id>' => 'user/update'`: update a user
 * - `'DELETE users/<id>' => 'user/delete'`: delete a user
 * - `'GET,HEAD users/<id>' => 'user/view'`: return the details/overview/options of a user
 * - `'POST users' => 'user/create'`: create a new user
 * - `'GET,HEAD users' => 'user/index'`: return a list/overview/options of users
 * - `'users/<id>' => 'user/options'`: process all unhandled verbs of a user
 * - `'users' => 'user/options'`: process all unhandled verbs of user collection
 *
 * You may configure [[only]] and/or [[except]] to disable some of the above rules.
 * You may configure [[patterns]] to completely redefine your own list of rules.
 * You may configure [[controller]] with multiple controller IDs to generate rules for all these controllers.
 * For example, the following code will disable the `delete` rule and generate rules for both `user` and `post` controllers:
 *
 * ```php
 * [
 *     'class' => 'yii\rest\UrlRule',
 *     'controller' => ['user', 'post'],
 *     'except' => ['delete'],
 * ]
 * ```
 *
 * The property [[controller]] is required and should represent one or multiple controller IDs.
 * Each controller ID should be prefixed with the module ID if the controller is within a module.
 * The controller ID used in the pattern will be automatically pluralized (e.g. `user` becomes `users`
 * as shown in the above examples).
 *
 * For more details and usage information on UrlRule, see the [guide article on rest routing](guide:rest-routing).
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class UrlRule extends CompositeUrlRule
{
    /**
     * @var string the common prefix string shared by all patterns.
     */
    public $prefix;
    /**
     * @var string the suffix that will be assigned to [[\yii\web\UrlRule::suffix]] for every generated rule.
     */
    public $suffix;
    /**
     * @var string|array the controller ID (e.g. `user`, `post-comment`) that the rules in this composite rule
     * are dealing with. It should be prefixed with the module ID if the controller is within a module (e.g. `admin/user`).
     *
     * By default, the controller ID will be pluralized automatically when it is put in the patterns of the
     * generated rules. If you want to explicitly specify how the controller ID should appear in the patterns,
     * you may use an array with the array key being as the controller ID in the pattern, and the array value
     * the actual controller ID. For example, `['u' => 'user']`.
     *
     * You may also pass multiple controller IDs as an array. If this is the case, this composite rule will
     * generate applicable URL rules for EVERY specified controller. For example, `['user', 'post']`.
     */
    public $controller;
    /**
     * @var array list of acceptable actions. If not empty, only the actions within this array
     * will have the corresponding URL rules created.
     * @see patterns
     */
    public $only = [];
    /**
     * @var array list of actions that should be excluded. Any action found in this array
     * will NOT have its URL rules created.
     * @see patterns
     */
    public $except = [];
    /**
     * @var array patterns for supporting extra actions in addition to those listed in [[patterns]].
     * The keys are the patterns and the values are the corresponding action IDs.
     * These extra patterns will take precedence over [[patterns]].
     */
    public $extraPatterns = [];
    /**
     * @var array list of tokens that should be replaced for each pattern. The keys are the token names,
     * and the values are the corresponding replacements.
     * @see patterns
     */
    public $tokens = [
        '{id}' => '<id:\\d[\\d,]*>',
    ];
    /**
     * @var array list of possible patterns and the corresponding actions for creating the URL rules.
     * The keys are the patterns and the values are the corresponding actions.
     * The format of patterns is `Verbs Pattern`, where `Verbs` stands for a list of HTTP verbs separated
     * by comma (without space). If `Verbs` is not specified, it means all verbs are allowed.
     * `Pattern` is optional. It will be prefixed with [[prefix]]/[[controller]]/,
     * and tokens in it will be replaced by [[tokens]].
     */
    public $patterns = [
        'PUT,PATCH {id}' => 'update',
        'DELETE {id}' => 'delete',
        'GET,HEAD {id}' => 'view',
        'POST' => 'create',
        'GET,HEAD' => 'index',
        '{id}' => 'options',
        '' => 'options',
    ];
    /**
     * @var array the default configuration for creating each URL rule contained by this rule.
     */
    public $ruleConfig = [
        'class' => 'yii\web\UrlRule',
    ];
    /**
     * @var bool whether to automatically pluralize the URL names for controllers.
     * If true, a controller ID will appear in plural form in URLs. For example, `user` controller
     * will appear as `users` in URLs.
     * @see controller
     */
    public $pluralize = true;

    /**
     * {@inheritdoc}
     */
    public function init()
    {
        if (empty($this->controller)) {
            throw new InvalidConfigException('"controller" must be set.');
        }

        $controllers = [];
        foreach ((array) $this->controller as $urlName => $controller) {
            if (is_int($urlName)) {
                $urlName = $this->pluralize ? Inflector::pluralize($controller) : $controller;
            }
            $controllers[$urlName] = $controller;
        }
        $this->controller = $controllers;

        $this->prefix = trim($this->prefix, '/');

        parent::init();
    }

    /**
     * {@inheritdoc}
     */
    protected function createRules()
    {
        $only = array_flip($this->only);
        $except = array_flip($this->except);
        $patterns = $this->extraPatterns + $this->patterns;
        $rules = [];
        foreach ($this->controller as $urlName => $controller) {
            $prefix = trim($this->prefix . '/' . $urlName, '/');
            foreach ($patterns as $pattern => $action) {
                if (!isset($except[$action]) && (empty($only) || isset($only[$action]))) {
                    $rules[$urlName][] = $this->createRule($pattern, $prefix, $controller . '/' . $action);
                }
            }
        }

        return $rules;
    }

    /**
     * Creates a URL rule using the given pattern and action.
     * @param string $pattern
     * @param string $prefix
     * @param string $action
     * @return UrlRuleInterface
     */
    protected function createRule($pattern, $prefix, $action)
    {
        $verbs = 'GET|HEAD|POST|PUT|PATCH|DELETE|OPTIONS';
        if (preg_match("/^((?:($verbs),)*($verbs))(?:\\s+(.*))?$/", $pattern, $matches)) {
            $verbs = explode(',', $matches[1]);
            $pattern = isset($matches[4]) ? $matches[4] : '';
        } else {
            $verbs = [];
        }

        $config = $this->ruleConfig;
        $config['verb'] = $verbs;
        $config['pattern'] = rtrim($prefix . '/' . strtr($pattern, $this->tokens), '/');
        $config['route'] = $action;
        if (!empty($verbs) && !in_array('GET', $verbs)) {
            $config['mode'] = WebUrlRule::PARSING_ONLY;
        }
        $config['suffix'] = $this->suffix;

        return Yii::createObject($config);
    }

    /**
     * {@inheritdoc}
     */
    public function parseRequest($manager, $request)
    {
        $pathInfo = $request->getPathInfo();
        foreach ($this->rules as $urlName => $rules) {
            if (strpos($pathInfo, $urlName) !== false) {
                foreach ($rules as $rule) {
                    /* @var $rule WebUrlRule */
                    $result = $rule->parseRequest($manager, $request);
                    if (YII_DEBUG) {
                        Yii::debug([
                            'rule' => method_exists($rule, '__toString') ? $rule->__toString() : get_class($rule),
                            'match' => $result !== false,
                            'parent' => self::className(),
                        ], __METHOD__);
                    }
                    if ($result !== false) {
                        return $result;
                    }
                }
            }
        }

        return false;
    }

    /**
     * {@inheritdoc}
     */
    public function createUrl($manager, $route, $params)
    {
        $this->createStatus = WebUrlRule::CREATE_STATUS_SUCCESS;
        foreach ($this->controller as $urlName => $controller) {
            if (strpos($route, $controller) !== false) {
                /* @var $rules UrlRuleInterface[] */
                $rules = $this->rules[$urlName];
                $url = $this->iterateRules($rules, $manager, $route, $params);
                if ($url !== false) {
                    return $url;
                }
            } else {
                $this->createStatus |= WebUrlRule::CREATE_STATUS_ROUTE_MISMATCH;
            }
        }

        if ($this->createStatus === WebUrlRule::CREATE_STATUS_SUCCESS) {
            // create status was not changed - there is no rules configured
            $this->createStatus = WebUrlRule::CREATE_STATUS_PARSING_ONLY;
        }

        return false;
    }
}