import jwt
from flask import request, jsonify
from typing import Optional, Dict

from apis import api_user

# TODO: Replace with your own secret key
ACCESS_TOKEN_SECRET = 'access_token_secret'
REFRESH_TOKEN_SECRET = 'refresh_token_secret'

# 模拟用户数据
MOCK_USERS = [
    {
        "username": "test_user",
        "password": "test_password"
    }
]


def generate_access_token(user: Dict) -> str:
    """
    生成访问令牌
    :param user: 用户信息
    :return: 访问令牌
    """
    return jwt.encode(user, ACCESS_TOKEN_SECRET, algorithm='HS256')


def generate_refresh_token(user: Dict) -> str:
    """
    生成刷新令牌
    :param user: 用户信息
    :return: 刷新令牌
    """
    return jwt.encode(user, REFRESH_TOKEN_SECRET, algorithm='HS256')


def verify_access_token() -> Optional[Dict]:
    """
    验证访问令牌
    :return: 用户信息（不包含密码）或 None
    """
    auth_header = request.headers.get('Authorization')
    if not auth_header or not auth_header.startswith('Bearer '):
        return None

    token = auth_header.split(' ')[1]
    try:
        decoded = jwt.decode(token, ACCESS_TOKEN_SECRET, algorithms=['HS256'])
        username = decoded.get('username')
        user = next((item for item in MOCK_USERS if item['username'] == username), None)
        if user:
            userinfo = {k: v for k, v in user.items() if k != 'password'}
            return userinfo
        return None
    except jwt.exceptions.InvalidTokenError:
        return None


def verify_refresh_token(token: str) -> Optional[Dict]:
    """
    验证刷新令牌
    :param token: 刷新令牌
    :return: 用户信息（不包含密码）或 None
    """
    try:
        decoded = jwt.decode(token, REFRESH_TOKEN_SECRET, algorithms=['HS256'])
        username = decoded.get('username')
        user = next((item for item in MOCK_USERS if item['username'] == username), None)
        if user:
            userinfo = {k: v for k, v in user.items() if k != 'password'}
            return userinfo
        return None
    except jwt.exceptions.InvalidTokenError:
        return None


##========================================
from flask import jsonify


def use_response_success(data=None):
    """
    成功响应
    :param data: 响应数据
    :return: 成功响应 JSON
    """
    return {
        "code": 0,
        "data": data,
        "error": None,
        "message": "ok"
    }


def use_page_response_success(page, page_size, list_data, message="ok"):
    """
    分页成功响应
    :param page: 页码
    :param page_size: 每页数量
    :param list_data: 数据列表
    :param message: 消息
    :return: 分页成功响应 JSON
    """
    page = int(page)
    page_size = int(page_size)
    offset = (page - 1) * page_size
    page_data = list_data[offset:offset + page_size]
    return {
        **use_response_success({
            "items": page_data,
            "total": len(list_data)
        }),
        "message": message
    }


def use_response_error(message, error=None):
    """
    错误响应
    :param message: 错误消息
    :param error: 错误信息
    :return: 错误响应 JSON
    """
    return {
        "code": -1,
        "data": None,
        "error": error,
        "message": message
    }


def forbidden_response(message="Forbidden Exception"):
    """
    禁止访问响应
    :param message: 错误消息
    :return: 禁止访问响应 JSON
    """
    return jsonify(use_response_error(message, message)), 403


def unAuthorizedResponse():
    """
    未授权响应
    :return: 未授权响应 JSON
    """
    return jsonify(use_response_error("Unauthorized Exception", "Unauthorized Exception")), 401


def sleep(ms):
    """
    睡眠函数
    :param ms: 睡眠时间（毫秒）
    :return: 无
    """
    import time
    time.sleep(ms / 1000)


def pagination(page_no, page_size, array):
    """
    分页函数
    :param page_no: 页码
    :param page_size: 每页数量
    :param array: 数据列表
    :return: 分页后的数据列表
    """
    page_no = int(page_no)
    page_size = int(page_size)
    offset = (page_no - 1) * page_size
    if offset + page_size >= len(array):
        return array[offset:]
    return array[offset:offset + page_size]


##========================================

def info():
    """
    获取用户信息
    :return: 用户信息或未授权响应
    """
    userinfo = verify_access_token()
    if not userinfo:
        return jsonify({
            "code": -1,
            "data": None,
            "error": "Unauthorized Exception",
            "message": "Unauthorized Exception"
        }), 401
    return jsonify({
        "code": 0,
        "data": userinfo,
        "error": None,
        "message": "ok"
    })


@api_user.route('/info', methods=['GET'])
def get_info():
    return info()