"""
Douyin Cookie Fetcher (T1)
用途: 模拟打开浏览器，用户扫码登录后自动获取 Cookie 并保存到 config_douyin.yml
"""

import sys
import os
import json
import yaml
import asyncio
import io
from pathlib import Path

# 强制设置控制台输出编码为 UTF-8，解决 Windows 环境下的乱码问题
if sys.platform.startswith('win'):
    sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8')
    sys.stderr = io.TextIOWrapper(sys.stderr.buffer, encoding='utf-8')

# =================================================================
# 1. 环境配置与路径初始化
# =================================================================
current_file_path = os.path.abspath(__file__)
current_dir = os.path.dirname(current_file_path)
config_path = os.path.join(current_dir, "config_douyin.yml")

# =================================================================
# 2. Cookie 过滤与更新逻辑
# =================================================================

# 我们关注的核心 Cookie 键名
# 进一步扩大范围以包含所有可能的校验 Cookie
REQUIRED_KEYS = {
    "msToken", "ttwid", "odin_tt", "passport_csrf_token", "sid_guard", 
    "sessionid", "sid_tt", "uid_tt", "uid_tt_ss", "sid_ucp_v1", 
    "ssid_ucp_v1", "n_sdk_version", "s_v_web_id", "webid",
    "__ac_nonce", "__ac_signature", "fp", "device_web_cpu_core",
    "device_web_memory_size", "architecture", "hevc_supported"
}

def update_config_yaml(new_cookies):
    """将获取到的 Cookie 更新到 config_douyin.yml"""
    config_data = {}
    
    # 1. 读取现有配置
    if os.path.exists(config_path):
        try:
            with open(config_path, 'r', encoding='utf-8') as f:
                config_data = yaml.safe_load(f) or {}
        except Exception as e:
            print(f"[  Warning  ]: Failed to read existing config: {e}")

    # 2. 更新 cookies 字段
    if "cookies" not in config_data:
        config_data["cookies"] = {}
    
    # 过滤出我们需要的键
    filtered_cookies = {k: v for k, v in new_cookies.items() if k in REQUIRED_KEYS}
    config_data["cookies"].update(filtered_cookies)
    
    # 同时更新全局 cookie 字符串 - 包含所有捕获到的 cookie 以确保完整性
    cookie_str = "; ".join(f"{k}={v}" for k, v in new_cookies.items())
    config_data["cookie"] = cookie_str

    # 3. 写回文件
    try:
        with open(config_path, 'w', encoding='utf-8') as f:
            yaml.dump(config_data, f, allow_unicode=True, default_flow_style=False, sort_keys=False)
        print(f"\n[  Success  ]: Cookie updated to: {config_path}")
        print(f"[  Info  ]: Captured {len(new_cookies)} total cookies, {len(filtered_cookies)} essential keys saved.")
    except Exception as e:
        print(f"[  Error  ]: Failed to write config: {e}")

# =================================================================
# 3. Playwright 自动化逻辑
# =================================================================

async def main():
    try:
        from playwright.async_api import async_playwright
    except ImportError:
        print("[  Error  ]: Playwright not installed. Run: pip install playwright && playwright install chromium")
        return

    print("\n" + "="*60)
    print("         Douyin Login & Cookie Fetcher")
    print("="*60)
    print("[  Instructions  ]:")
    print("1. Browser will open and navigate to Douyin.")
    print("2. Please login via QR code scanning.")
    print("3. After login, return here and press [ENTER] to save cookies.")
    print("="*60 + "\n")

    async with async_playwright() as p:
        # 启动浏览器
        browser = await p.chromium.launch(headless=False)
        context = await browser.new_context(
            viewport={'width': 1280, 'height': 800},
            user_agent='Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36'
        )
        page = await context.new_page()

        # 跳转到抖音
        # 优化: 使用 'domcontentloaded' 提高在弱网环境下的加载成功率，并增加超时到 90s
        print("[  Navigating  ]: https://www.douyin.com/ ...")
        try:
            await page.goto("https://www.douyin.com/", wait_until="domcontentloaded", timeout=90000)
        except Exception as e:
            print(f"[  Warning  ]: Initial navigation timed out or failed: {e}")
            print("[  Info  ]: Will continue anyway, please check if the page is visible.")

        # =================================================================
        # 自动检测登录 + 手动回车双重保险
        # =================================================================
        print("\n" + "-"*40)
        print("[  Waiting  ]: Please complete the QR login in the browser.")
        print("[  Auto-Detect  ]: The script will automatically proceed if login is detected.")
        print("[  Manual  ]: If auto-detect fails, type 'go' and press [ENTER] here.")
        print("-"*40 + "\n")

        # 尝试自动检测登录成功的元素（比如头像或“发布视频”按钮）
        login_detected = False
        for _ in range(120):  # 最多等待 120 秒
            try:
                # 检查是否存在登录后的特有元素
                # .dy-avatar 是头像，.upload-video-text 是发布视频按钮
                if await page.query_selector('.dy-avatar') or await page.query_selector('text=发布视频'):
                    print("[  Success  ]: Login detected automatically!")
                    login_detected = True
                    break
            except:
                pass
            await asyncio.sleep(1)
            
        if not login_detected:
            # 如果自动检测没成功，再尝试手动输入
            print("[  Timeout  ]: Auto-detection timed out. Please ensure you are logged in.")
            print("[  Action  ]: Type anything and press [ENTER] to force capture cookies:")
            await asyncio.to_thread(sys.stdin.readline)

        # 获取所有 Cookie
        all_cookies = await context.cookies()
        cookie_dict = {c['name']: c['value'] for c in all_cookies}

        # 尝试捕获动态参数 msToken (如果存在于页面中)
        try:
            # 1. 尝试从 localStorage 获取
            ms_token = await page.evaluate("() => window.localStorage.getItem('msToken') || ''")
            
            # 2. 如果没获取到，尝试从所有 Cookie 中找最新的 msToken
            if not ms_token:
                ms_token = cookie_dict.get('msToken', '')
                
            # 3. 尝试从页面全局变量中寻找
            if not ms_token:
                ms_token = await page.evaluate("() => window._ROUTER_DATA?.msToken || ''")

            if ms_token:
                cookie_dict['msToken'] = ms_token
                print(f"[  Info  ]: Captured msToken: {ms_token[:20]}...")
            else:
                print("[  Warning  ]: msToken not found in common locations.")
        except Exception as e:
            print(f"[  Debug  ]: Error capturing msToken: {e}")

        # 关闭浏览器
        await context.close()
        await browser.close()

        # 更新配置文件
        if cookie_dict:
            update_config_yaml(cookie_dict)
        else:
            print("[  Failed  ]: No cookies captured. Did you login successfully?")

if __name__ == "__main__":
    asyncio.run(main())