// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;

import "../IERC20Detailed.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "./WhitelistMock.sol";

contract FixedSwapMock is Pausable, WhitelistMock {
    using SafeMath for uint256;
    uint256 increment = 0;

    mapping(uint256 => Purchase) public purchases; /* Purchasers mapping */
    address[] public buyers; /* Current Buyers Addresses */
    uint256[] public purchaseIds; /* All purchaseIds */
    mapping(address => uint256[]) public myPurchases; /* Purchasers mapping */

    IERC20 public erc20;
    bool public isSaleFunded = false;
    uint public decimals = 0;
    bool public unsoldTokensRedeemed = false;
    uint256 public tradeValue; /* Price in Wei */
    uint256 public startDate; /* Start Date  */
    uint256 public endDate; /* End Date  */
    uint256 public individualMinimumAmount = 0; /* Minimum Amount Per Address */
    uint256 public individualMaximumAmount = 0; /* Maximum Amount Per Address */
    uint256 public minimumRaise = 0; /* Minimum Amount of Tokens that have to be sold */
    uint256 public tokensAllocated = 0; /* Tokens Available for Allocation - Dynamic */
    uint256 public tokensForSale = 0; /* Tokens Available for Sale */
    bool public isTokenSwapAtomic; /* Make token release atomic or not */
    address payable public feeAddress; /* Default Address for Fee Percentage */
    uint256 public feePercentage = 1; /* Default Fee 1% */
    bool private locked;

    struct Purchase {
        uint256 amount;
        address purchaser;
        uint256 ethAmount;
        uint256 timestamp;
        bool wasFinalized; /* Confirm the tokens were sent already */
        bool reverted; /* Confirm the tokens were sent already */
    }

    constructor(
        address _tokenAddress,
        address payable _feeAddress,
        uint256 _tradeValue,
        uint256 _tokensForSale,
        uint256 _startDate,
        uint256 _endDate,
        uint256 _individualMinimumAmount,
        uint256 _individualMaximumAmount,
        bool _isTokenSwapAtomic,
        uint256 _minimumRaise,
        uint256 _feeAmount,
        bool _hasWhitelisting
    ) WhitelistMock(_hasWhitelisting) {
        /* Confirmations */
        require(block.timestamp < _endDate, "End Date should be further than current date");
        require(block.timestamp < _startDate, "Start Date should be further than current date");
        require(_startDate < _endDate, "End Date higher than Start Date");
        require(_tokensForSale > 0, "Tokens for Sale should be > 0");
        require(_tokensForSale > _individualMinimumAmount, "Tokens for Sale should be > Individual Minimum Amount");
        require(_individualMaximumAmount >= _individualMinimumAmount, "Individual Maximum Amount should be > Individual Minimum Amount");
        require(_minimumRaise <= _tokensForSale, "Minimum Raise should be < Tokens For Sale");
        require(_feeAmount >= feePercentage, "Fee Percentage has to be >= 1");
        require(_feeAmount <= 99, "Fee Percentage has to be < 100");
        require(_feeAddress != address(0), "Fee Address has to be not ZERO");
        require(_tokenAddress != address(0), "Token Address has to be not ZERO");

        startDate = _startDate;
        endDate = _endDate;
        tokensForSale = _tokensForSale;
        tradeValue = _tradeValue;

        individualMinimumAmount = _individualMinimumAmount;
        individualMaximumAmount = _individualMaximumAmount;
        isTokenSwapAtomic = _isTokenSwapAtomic;

        if (!_isTokenSwapAtomic) {
            /* If raise is not atomic swap */
            minimumRaise = _minimumRaise;
        }

        erc20 = IERC20(_tokenAddress);
        decimals = IERC20Detailed(_tokenAddress).decimals();
        feePercentage = _feeAmount;
        feeAddress = _feeAddress;
    }

    /* Get Functions */
    function isBuyer(uint256 purchase_id) public view returns (bool) {
        return (msg.sender == purchases[purchase_id].purchaser);
    }

    /* Get Functions */
    function totalRaiseCost() public view returns (uint256) {
        return (cost(tokensForSale));
    }

    function availableTokens() public view returns (uint256) {
        return erc20.balanceOf(address(this));
    }

    function tokensLeft() public view returns (uint256) {
        return tokensForSale - tokensAllocated;
    }

    function hasMinimumRaise() public view returns (bool) {
        return (minimumRaise != 0);
    }

    function hasFinalized() public view returns (bool) {
        return block.timestamp > endDate;
    }

    function hasStarted() public view returns (bool) {
        return block.timestamp >= startDate;
    }

    function isPreStart() public view returns (bool) {
        return block.timestamp < startDate;
    }

    function isOpen() public view returns (bool) {
        return hasStarted() && !hasFinalized();
    }

    function hasMinimumAmount() public view returns (bool) {
        return (individualMinimumAmount != 0);
    }

    function cost(uint256 _amount) public view returns (uint256) {
        return _amount.mul(tradeValue).div(10**decimals);
    }

    function getPurchase(uint256 _purchase_id)
        external
        view
        returns (
            uint256,
            address,
            uint256,
            uint256,
            bool,
            bool
        )
    {
        Purchase memory purchase = purchases[_purchase_id];
        return (purchase.amount, purchase.purchaser, purchase.ethAmount, purchase.timestamp, purchase.wasFinalized, purchase.reverted);
    }

    function getPurchaseIds() public view returns (uint256[] memory) {
        return purchaseIds;
    }

    function getBuyers() public view returns (address[] memory) {
        return buyers;
    }

    function getMyPurchases(address _address) public view returns (uint256[] memory) {
        return myPurchases[_address];
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IERC20Detailed is IERC20 {

    function decimals() external view returns (uint8);

}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () internal {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;

contract WhitelistMock {
    mapping(address => bool) public whitelist;
    address[] public whitelistedAddresses;
    bool public hasWhitelisting = false;

    constructor(bool _hasWhitelisting) {
        hasWhitelisting = _hasWhitelisting;
    }

    function getWhitelistedAddresses() public view returns (address[] memory) {
        return whitelistedAddresses;
    }

    function isWhitelisted(address _address) public view returns (bool) {
        return whitelist[_address];
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}