"""生成可校验的 Client 发布清单。"""

from __future__ import annotations

import argparse
import hashlib
import json
from pathlib import Path
from typing import Any


MANIFEST_FILE_NAME = "autobuy——manifest.json"


def file_description(path: Path) -> dict[str, Any]:
    """返回发布文件的名称、字节大小和 SHA256。"""

    digest = hashlib.sha256()
    with path.open("rb") as file:
        for block in iter(lambda: file.read(1024 * 1024), b""):
            digest.update(block)
    return {
        "file": path.name,
        "size": path.stat().st_size,
        "sha256": digest.hexdigest(),
    }


def build_manifest(version: str, update_zip: Path, portable_zip: Path) -> dict[str, Any]:
    """组装发布清单数据。"""

    if not version.strip():
        raise ValueError("版本号不能为空")
    for path in (update_zip, portable_zip):
        if not path.is_file():
            raise FileNotFoundError(path)

    return {
        "schema_version": 1,
        "product": "CMAutoBuy",
        "version": version,
        "update": file_description(update_zip),
        "portable": file_description(portable_zip),
    }


def write_manifest(
    version: str,
    update_zip: Path,
    portable_zip: Path,
    output: Path,
) -> None:
    """把发布清单写成不带 BOM 的 UTF-8 JSON。"""

    manifest = build_manifest(version, update_zip, portable_zip)
    output.parent.mkdir(parents=True, exist_ok=True)
    output.write_text(
        json.dumps(manifest, ensure_ascii=False, indent=2) + "\n",
        encoding="utf-8",
    )


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(description="生成 Client 发布清单")
    parser.add_argument("--version", required=True)
    parser.add_argument("--update", required=True, type=Path)
    parser.add_argument("--portable", required=True, type=Path)
    parser.add_argument("--output", required=True, type=Path)
    return parser.parse_args()


def main() -> int:
    args = parse_args()
    write_manifest(args.version, args.update, args.portable, args.output)
    return 0


if __name__ == "__main__":
    raise SystemExit(main())