from __future__ import annotations

import argparse
import socket
import subprocess
import sys
import time
from pathlib import Path

from Douyin import DEFAULT_USER_URL

DEFAULT_CHROME_PATH = "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"
DEFAULT_BROWSER_PORT = 9223
DEFAULT_PROFILE_DIR = Path(".douyin-chrome-profile")


def derive_chrome_app_path(chrome_path: str) -> str:
    marker = ".app/"
    if marker not in chrome_path:
        return chrome_path
    prefix, _ = chrome_path.split(marker, 1)
    return f"{prefix}.app"


def build_login_command(
    chrome_path: str,
    profile_dir: Path,
    browser_port: int,
    user_url: str,
) -> list[str]:
    app_path = derive_chrome_app_path(chrome_path)
    return [
        "open",
        "-na",
        app_path,
        "--args",
        f"--user-data-dir={profile_dir}",
        f"--remote-debugging-port={browser_port}",
        user_url,
    ]


def build_parser() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser(description="启动可见 Chrome，供抖音手动登录后附着抓取")
    parser.add_argument("--chrome-path", default=DEFAULT_CHROME_PATH, help="Chrome 可执行文件路径")
    parser.add_argument(
        "--profile-dir",
        default=str(DEFAULT_PROFILE_DIR),
        help="Chrome 用户数据目录，默认复用项目内固定目录",
    )
    parser.add_argument(
        "--browser-port",
        type=int,
        default=DEFAULT_BROWSER_PORT,
        help="Chrome 调试端口，默认 9223",
    )
    parser.add_argument("--user-url", default=DEFAULT_USER_URL, help="启动后打开的抖音主页 URL")
    return parser


def launch_browser(command: list[str]) -> subprocess.Popen[str]:
    return subprocess.Popen(command)


def wait_for_browser_debug_port(
    browser_port: int,
    timeout_seconds: float = 15.0,
    interval_seconds: float = 0.25,
) -> None:
    deadline = time.monotonic() + timeout_seconds
    while time.monotonic() < deadline:
        try:
            with socket.create_connection(("127.0.0.1", browser_port), timeout=1):
                return
        except OSError:
            time.sleep(interval_seconds)

    raise RuntimeError(
        f"Chrome 已启动命令，但调试端口 {browser_port} 在限定时间内未就绪。"
    )


def main(argv: list[str] | None = None) -> int:
    parser = build_parser()
    args = parser.parse_args(argv)

    if args.browser_port <= 0:
        parser.error("--browser-port 必须大于 0")

    chrome_path = Path(args.chrome_path)
    if not chrome_path.exists():
        print(f"[ERROR] Chrome 可执行文件不存在: {chrome_path}")
        return 1

    profile_dir = Path(args.profile_dir).resolve()
    profile_dir.mkdir(parents=True, exist_ok=True)
    command = build_login_command(
        chrome_path=str(chrome_path),
        profile_dir=profile_dir,
        browser_port=args.browser_port,
        user_url=args.user_url,
    )

    try:
        launch_browser(command)
    except OSError as exc:
        print(f"[ERROR] 启动 Chrome 失败: {exc}")
        return 1

    try:
        wait_for_browser_debug_port(args.browser_port)
    except RuntimeError as exc:
        print(f"[ERROR] {exc}")
        return 1

    print("[INFO] Chrome 已启动。请在打开的浏览器中完成抖音登录和验证码。")
    print(f"[INFO] 登录完成后执行: ./.venv/bin/python Douyin.py --browser-port {args.browser_port}")
    return 0


if __name__ == "__main__":
    sys.exit(main())