import random

import requests
from fake_useragent import UserAgent
from flask import Flask, request, jsonify

app = Flask(__name__)


def generate_random_headers():
    """
    生成随机的User-Agent头部。

    :return: 随机的User-Agent头部
    :rtype: dict
    """
    user_agent = UserAgent().random
    accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
    accept_language = random.choice(
        ["zh-CN,zh;q=0.9",
         "en-US,en;q=0.5",
         "en-GB,en;q=0.5",
         "de-DE,de;q=0.5",
         "fr-FR,fr;q=0.5"])
    accept_encoding = "gzip, deflate, br"
    referer = random.choice(
        ["https://www.baidu.com",
         "https://www.google.com",
         "https://www.bing.com"])

    headers = {
        "User-Agent": user_agent,
        "Accept": accept,
        "Accept-Language": accept_language,
        "Accept-Encoding": accept_encoding,
        "Referer": referer,
    }

    return headers


@app.route('/proxy', methods=['POST'])
def proxy():
    """
    代理接口，转发请求到指定的 URL。
    接受 JSON 格式的请求体，其中应包含 URL、HTTP 方法和其他可选参数。
    返回格式化的响应，包含状态码、消息释义和数据。
    """
    req_data = request.json

    # 确保提供了 url 和 method
    if 'url' not in req_data or 'method' not in req_data:
        return jsonify({'status': 'error', 'msg': 'URL or Method not provided', 'data': {}}), 400

    url = req_data['url']
    method = req_data['method'].lower()

    # 支持的请求方法
    supported_methods = {'get', 'post', 'put', 'delete', 'patch'}
    if method not in supported_methods:
        return jsonify({'status': 'error', 'msg': 'Unsupported method', 'data': {}}), 400

    # 提取请求参数
    params = req_data.get('params', {})
    data = req_data.get('data', {})
    json_data = req_data.get('json', {})
    headers = req_data.get('headers', generate_random_headers())
    cookies = req_data.get('cookies', {})
    timeout = req_data.get('timeout', 10)

    try:
        # 使用 requests 发送请求
        response = requests.request(method, url, params=params, data=data, json=json_data,
                                    headers=headers, cookies=cookies, timeout=timeout)

        # 尝试解析 JSON，如果不是 JSON 则保持原样
        try:
            response_json = response.json()
        except ValueError:
            response_json = {}

        # 构建响应数据
        response_data = {
            'url': response.url,
            'headers': dict(response.headers),
            'status_code': response.status_code,
            'text': response.text,
            'json': response_json,
            'cookies': requests.utils.dict_from_cookiejar(response.cookies)
        }
        return jsonify({
            'status': 'success',
            'msg': 'Request successful',
            'data': response_data
        }), response.status_code
    except requests.RequestException as e:
        # 请求过程中出现异常
        return jsonify({
            'status': 'error',
            'msg': str(e),
            'data': {}
        }), 500


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000)