#
#  Copyright 2024 The InfiniFlow Authors. All Rights Reserved.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#
import base64
import datetime
import io
import json
import os
import pickle
import socket
import time
import uuid
import requests
import logging
import copy
from enum import Enum, IntEnum
import importlib
from Cryptodome.PublicKey import RSA
from Cryptodome.Cipher import PKCS1_v1_5 as Cipher_pkcs1_v1_5
from filelock import FileLock
from api.constants import SERVICE_CONF

from . import file_utils


def conf_realpath(conf_name):
    conf_path = f"conf/{conf_name}"
    return os.path.join(file_utils.get_project_base_directory(), conf_path)


def read_config(conf_name=SERVICE_CONF):
    local_config = {}
    local_path = conf_realpath(f'local.{conf_name}')

    # load local config file
    if os.path.exists(local_path):
        local_config = file_utils.load_yaml_conf(local_path)
        if not isinstance(local_config, dict):
            raise ValueError(f'Invalid config file: "{local_path}".')

    global_config_path = conf_realpath(conf_name)
    global_config = file_utils.load_yaml_conf(global_config_path)

    if not isinstance(global_config, dict):
        raise ValueError(f'Invalid config file: "{global_config_path}".')

    global_config.update(local_config)
    return global_config


CONFIGS = read_config()


def show_configs():
    msg = f"Current configs, from {conf_realpath(SERVICE_CONF)}:"
    for k, v in CONFIGS.items():
        if isinstance(v, dict):
            if "password" in v:
                v = copy.deepcopy(v)
                v["password"] = "*" * 8
        msg += f"\n\t{k}: {v}"
    logging.info(msg)


def get_base_config(key, default=None):
    if key is None:
        return None
    if default is None:
        default = os.environ.get(key.upper())
    return CONFIGS.get(key, default)


use_deserialize_safe_module = get_base_config(
    'use_deserialize_safe_module', False)


class BaseType:
    def to_dict(self):
        return dict([(k.lstrip("_"), v) for k, v in self.__dict__.items()])

    def to_dict_with_type(self):
        def _dict(obj):
            module = None
            if issubclass(obj.__class__, BaseType):
                data = {}
                for attr, v in obj.__dict__.items():
                    k = attr.lstrip("_")
                    data[k] = _dict(v)
                module = obj.__module__
            elif isinstance(obj, (list, tuple)):
                data = []
                for i, vv in enumerate(obj):
                    data.append(_dict(vv))
            elif isinstance(obj, dict):
                data = {}
                for _k, vv in obj.items():
                    data[_k] = _dict(vv)
            else:
                data = obj
            return {"type": obj.__class__.__name__,
                    "data": data, "module": module}

        return _dict(self)


class CustomJSONEncoder(json.JSONEncoder):
    def __init__(self, **kwargs):
        self._with_type = kwargs.pop("with_type", False)
        super().__init__(**kwargs)

    def default(self, obj):
        if isinstance(obj, datetime.datetime):
            return obj.strftime('%Y-%m-%d %H:%M:%S')
        elif isinstance(obj, datetime.date):
            return obj.strftime('%Y-%m-%d')
        elif isinstance(obj, datetime.timedelta):
            return str(obj)
        elif issubclass(type(obj), Enum) or issubclass(type(obj), IntEnum):
            return obj.value
        elif isinstance(obj, set):
            return list(obj)
        elif issubclass(type(obj), BaseType):
            if not self._with_type:
                return obj.to_dict()
            else:
                return obj.to_dict_with_type()
        elif isinstance(obj, type):
            return obj.__name__
        else:
            return json.JSONEncoder.default(self, obj)


def rag_uuid():
    return uuid.uuid1().hex


def string_to_bytes(string):
    return string if isinstance(
        string, bytes) else string.encode(encoding="utf-8")


def bytes_to_string(byte):
    return byte.decode(encoding="utf-8")


def json_dumps(src, byte=False, indent=None, with_type=False):
    dest = json.dumps(
        src,
        indent=indent,
        cls=CustomJSONEncoder,
        with_type=with_type)
    if byte:
        dest = string_to_bytes(dest)
    return dest


def json_loads(src, object_hook=None, object_pairs_hook=None):
    if isinstance(src, bytes):
        src = bytes_to_string(src)
    return json.loads(src, object_hook=object_hook,
                      object_pairs_hook=object_pairs_hook)


def current_timestamp():
    return int(time.time() * 1000)


def timestamp_to_date(timestamp, format_string="%Y-%m-%d %H:%M:%S"):
    if not timestamp:
        timestamp = time.time()
    timestamp = int(timestamp) / 1000
    time_array = time.localtime(timestamp)
    str_date = time.strftime(format_string, time_array)
    return str_date


def date_string_to_timestamp(time_str, format_string="%Y-%m-%d %H:%M:%S"):
    time_array = time.strptime(time_str, format_string)
    time_stamp = int(time.mktime(time_array) * 1000)
    return time_stamp


def serialize_b64(src, to_str=False):
    dest = base64.b64encode(pickle.dumps(src))
    if not to_str:
        return dest
    else:
        return bytes_to_string(dest)


def deserialize_b64(src):
    src = base64.b64decode(
        string_to_bytes(src) if isinstance(
            src, str) else src)
    if use_deserialize_safe_module:
        return restricted_loads(src)
    return pickle.loads(src)


safe_module = {
    'numpy',
    'rag_flow'
}


class RestrictedUnpickler(pickle.Unpickler):
    def find_class(self, module, name):
        import importlib
        if module.split('.')[0] in safe_module:
            _module = importlib.import_module(module)
            return getattr(_module, name)
        # Forbid everything else.
        raise pickle.UnpicklingError("global '%s.%s' is forbidden" %
                                     (module, name))


def restricted_loads(src):
    """Helper function analogous to pickle.loads()."""
    return RestrictedUnpickler(io.BytesIO(src)).load()


def get_lan_ip():
    if os.name != "nt":
        import fcntl
        import struct

        def get_interface_ip(ifname):
            s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            return socket.inet_ntoa(
                fcntl.ioctl(s.fileno(), 0x8915, struct.pack('256s', string_to_bytes(ifname[:15])))[20:24])

    ip = socket.gethostbyname(socket.getfqdn())
    if ip.startswith("127.") and os.name != "nt":
        interfaces = [
            "bond1",
            "eth0",
            "eth1",
            "eth2",
            "wlan0",
            "wlan1",
            "wifi0",
            "ath0",
            "ath1",
            "ppp0",
        ]
        for ifname in interfaces:
            try:
                ip = get_interface_ip(ifname)
                break
            except IOError:
                pass
    return ip or ''


def from_dict_hook(in_dict: dict):
    if "type" in in_dict and "data" in in_dict:
        if in_dict["module"] is None:
            return in_dict["data"]
        else:
            return getattr(importlib.import_module(
                in_dict["module"]), in_dict["type"])(**in_dict["data"])
    else:
        return in_dict


def decrypt_database_password(password):
    encrypt_password = get_base_config("encrypt_password", False)
    encrypt_module = get_base_config("encrypt_module", False)
    private_key = get_base_config("private_key", None)

    if not password or not encrypt_password:
        return password

    if not private_key:
        raise ValueError("No private key")

    module_fun = encrypt_module.split("#")
    pwdecrypt_fun = getattr(
        importlib.import_module(
            module_fun[0]),
        module_fun[1])

    return pwdecrypt_fun(private_key, password)


def decrypt_database_config(
        database=None, passwd_key="password", name="database"):
    if not database:
        database = get_base_config(name, {})

    database[passwd_key] = decrypt_database_password(database[passwd_key])
    return database


def update_config(key, value, conf_name=SERVICE_CONF):
    conf_path = conf_realpath(conf_name=conf_name)
    if not os.path.isabs(conf_path):
        conf_path = os.path.join(
            file_utils.get_project_base_directory(), conf_path)

    with FileLock(os.path.join(os.path.dirname(conf_path), ".lock")):
        config = file_utils.load_yaml_conf(conf_path=conf_path) or {}
        config[key] = value
        file_utils.rewrite_yaml_conf(conf_path=conf_path, config=config)


def get_uuid():
    return uuid.uuid1().hex


def datetime_format(date_time: datetime.datetime) -> datetime.datetime:
    return datetime.datetime(date_time.year, date_time.month, date_time.day,
                             date_time.hour, date_time.minute, date_time.second)


def get_format_time() -> datetime.datetime:
    return datetime_format(datetime.datetime.now())


def str2date(date_time: str):
    return datetime.datetime.strptime(date_time, '%Y-%m-%d')


def elapsed2time(elapsed):
    seconds = elapsed / 1000
    minuter, second = divmod(seconds, 60)
    hour, minuter = divmod(minuter, 60)
    return '%02d:%02d:%02d' % (hour, minuter, second)


def decrypt(line):
    file_path = os.path.join(
        file_utils.get_project_base_directory(),
        "conf",
        "private.pem")
    rsa_key = RSA.importKey(open(file_path).read(), "Welcome")
    cipher = Cipher_pkcs1_v1_5.new(rsa_key)
    return cipher.decrypt(base64.b64decode(
        line), "Fail to decrypt password!").decode('utf-8')


def download_img(url):
    if not url:
        return ""
    response = requests.get(url)
    return "data:" + \
        response.headers.get('Content-Type', 'image/jpg') + ";" + \
        "base64," + base64.b64encode(response.content).decode("utf-8")


def delta_seconds(date_string: str):
    dt = datetime.datetime.strptime(date_string, "%Y-%m-%d %H:%M:%S")
    return (datetime.datetime.now() - dt).total_seconds()