import tomllib
from pathlib import Path
from zipfile import ZIP_DEFLATED, ZipFile


PROJECT_ROOT = Path(__file__).resolve().parent
SOURCE_DIR = PROJECT_ROOT / "src" / "snapform"
DIST_DIR = PROJECT_ROOT / "dist"
PLATFORMS = ("windows-x64", "macos-arm64", "linux-x64")


def manifest_for_platform(platform):
    """Return the manifest text declaring only the given platform."""
    text = (SOURCE_DIR / "blender_manifest.toml").read_text(encoding="utf-8")
    lines = text.splitlines()
    table_start = next(
        (i for i, line in enumerate(lines) if line.startswith("[")),
        len(lines),
    )
    head = lines[:table_start]
    tail = lines[table_start:]
    head = [line for line in head if not line.strip().startswith("platforms =")]
    # 插入顶层区域，避免 platforms 被解析为后续 table 的子键。
    # 放在 blender_version_min 后面，使扩展元数据保持易读。
    insert_at = next(
        (i + 1 for i, line in enumerate(head) if line.strip().startswith("blender_version_min")),
        len(head),
    )
    head.insert(insert_at, f'platforms = ["{platform}"]')
    lines = head + tail
    return "\n".join(lines) + "\n"


def build_extension(platform):
    if platform not in PLATFORMS:
        raise ValueError(f"Unsupported platform: {platform}")
    manifest = tomllib.loads(manifest_for_platform(platform))
    output_path = DIST_DIR / (
        f"{manifest['name']}.v{manifest['version']}.{platform}.zip"
    )
    DIST_DIR.mkdir(exist_ok=True)
    with ZipFile(output_path, "w", ZIP_DEFLATED) as archive:
        for source_path in sorted(SOURCE_DIR.rglob("*")):
            if not source_path.is_file():
                continue
            if "__pycache__" in source_path.parts:
                continue
            relative_path = source_path.relative_to(SOURCE_DIR)
            if source_path.name == "blender_manifest.toml":
                continue
            archive.write(source_path, relative_path)
        archive.writestr(
            "blender_manifest.toml",
            manifest_for_platform(platform),
        )
    return output_path


def build_all():
    return [build_extension(platform) for platform in PLATFORMS]


if __name__ == "__main__":
    extension_paths = build_all()
    for extension_path in extension_paths:
        size_mib = extension_path.stat().st_size / (1024 * 1024)
        print(f"Built {extension_path} ({size_mib:.2f} MiB)")