# -*- coding: utf-8 -*-
"""命令行入口（python -m music_downloader）。"""

from __future__ import annotations

import asyncio
import sys
from dataclasses import asdict

from .downloader import (
    MusicDownloader,
)
from .models import (
    DownloadException,
)

# ============ CLI 入口 ============


def _print_usage() -> None:
    """无参数时打印模块信息与用法。"""
    print("网易云音乐下载器")
    print("支持的音质: standard / exhigh / lossless / hires / sky / jyeffect / jymaster / dolby")
    print("支持的功能: 单曲/批量下载、标签与封面写入（mutagen 纯 Python）")
    print()
    print("用法:")
    print("  python -m music_downloader <music_id> [quality]            # 仅打印信息")
    print("  python -m music_downloader <music_id> [quality] --download # 打印并下载")
    print()
    print("示例:")
    print("  python -m music_downloader 123456")
    print("  python -m music_downloader 123456 lossless")
    print("  python -m music_downloader 123456 hires --download")


async def _main(argv: list[str]) -> int:
    """CLI 主体（下载链路是协程，故整体在 asyncio.run 里跑）。返回进程退出码。"""
    downloader = MusicDownloader()

    if len(argv) < 2:
        _print_usage()
        return 0

    try:
        music_id = int(argv[1])
    except ValueError:
        print(f"错误: music_id 必须是整数，收到: {argv[1]!r}")
        return 1

    quality = argv[2] if len(argv) > 2 and not argv[2].startswith("--") else "lossless"
    do_download = "--download" in argv

    try:
        info = await downloader.get_music_info(music_id, quality)
    except DownloadException as e:
        print(f"获取音乐信息失败: {e}")
        return 1

    print()
    print("=" * 70)
    print(f"音乐信息  (ID={info.id}, quality={info.quality})")
    print("=" * 70)

    info_dict = asdict(info)
    for key, value in info_dict.items():
        # 歌词太长，只显示行数
        if key in ("lyric", "tlyric"):
            lines = [ln for ln in (value or "").splitlines() if ln.strip()]
            preview = " | ".join(lines[:2])[:80] if lines else "(空)"
            print(f"  {key:<14}: {len(lines)} 行  预览: {preview}{'...' if len(lines) > 2 else ''}")
            continue
        # URL 类字段：完整展示（如果终端窄可换行）
        if key in ("download_url", "pic_url"):
            print(f"  {key:<14}: {value}")
            continue
        print(f"  {key:<14}: {value}")

    print("=" * 70)

    if do_download:
        print()
        print("开始下载...")
        result = await downloader.download_music_file(music_id, quality)
        if result.success:
            print(f"下载完成: {result.file_path}  ({result.file_size} 字节)")
        else:
            print(f"下载失败: {result.error_message}")
            return 1

    return 0


if __name__ == "__main__":
    sys.exit(asyncio.run(_main(sys.argv)))