"""
练习 02: 用 Playwright 持久化浏览器目录保留登录态。

目标:
1. 自己导入 `sync_playwright`
2. 学会 `launch_persistent_context(user_data_dir=...)`
3. 打开一个固定页面后，手动确认这个浏览器目录会被复用
4. 理解为什么不要直接复用你日常 Chrome 默认资料目录

建议:
- 第一版先把浏览器正常启动起来
- `user_data_dir` 建议放在项目目录里，便于观察
- 如果你想验证登录态，连续运行两次并观察 cookie / 登录状态变化

运行:
    ./.venv/bin/python learning/playwright_basics/02_persistent_context.py
"""

from __future__ import annotations

import sys
from pathlib import Path

PROJECT_ROOT = Path(__file__).resolve().parent.parent.parent
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))

USER_DATA_DIR = PROJECT_ROOT / ".playwright-douyin-profile"
DEFAULT_URL = "https://www.douyin.com/"


def get_or_create_page(context):
    if getattr(context, "pages", None):
        return context.pages[0]
    return context.new_page()


def main() -> None:
    from playwright.sync_api import sync_playwright

    with sync_playwright() as playwright:
        context = playwright.chromium.launch_persistent_context(
            user_data_dir=str(USER_DATA_DIR),
            headless=False,
        )
        page = get_or_create_page(context)
        page.goto(DEFAULT_URL)
        print(f"[INFO] 用户目录: {USER_DATA_DIR}")
        print(f"[INFO] 当前 URL: {page.url}")
        print(f"[INFO] 页面标题: {page.title()}")
        input("观察浏览器状态后按回车退出...")
        context.close()


if __name__ == "__main__":
    main()