#!/usr/bin/env python3
"""启动 3D 服务端。

用法：
    python3 viewer/backend/run.py                 # 默认 127.0.0.1:5182
    python3 viewer/backend/run.py --port 9100 --reload
"""

import argparse
import sys
from pathlib import Path

BASE_DIR = Path(__file__).resolve().parent
sys.path.insert(0, str(BASE_DIR))


def _require_dependencies() -> None:
    missing = [name for name in ("fastapi", "uvicorn") if _importable(name) is None]
    if not missing:
        return
    req = BASE_DIR / "requirements.txt"
    sys.stderr.write(
        "\n[启动失败] 当前 Python 缺少依赖: " + ", ".join(missing) + "\n"
        f"  当前解释器: {sys.executable}\n"
        f"  版本: {sys.version.split()[0]}\n"
        f"  安装依赖: {sys.executable} -m pip install -r {req}\n"
        "\n提示：如果 `python3` 指向系统解释器（如 /usr/bin/python3），\n"
        "请先激活项目环境（conda activate compressor-wave），\n"
        "或用 conda run -n compressor-wave python3 viewer/backend/run.py 运行。\n",
    )
    raise SystemExit(1)


def _importable(name: str):
    try:
        return __import__(name)
    except ImportError:
        return None


def main() -> None:
    _require_dependencies()
    import uvicorn

    parser = argparse.ArgumentParser(description="压缩机 3D 部件查看服务")
    parser.add_argument("--host", default="127.0.0.1")
    parser.add_argument("--port", type=int, default=5182)
    parser.add_argument("--reload", action="store_true")
    args = parser.parse_args()

    uvicorn.run("main:app", host=args.host, port=args.port, reload=args.reload)


if __name__ == "__main__":
    main()