#!/usr/bin/env python

import argparse
import json
import sys
from pathlib import Path
import tempfile
from uvicorn.importer import import_from_string
import subprocess
import shutil

def main() -> None:
    parser = argparse.ArgumentParser(prog="gen-openapi")
    parser.add_argument(
        "--app", help='App import string. Eg. "clan_cli.webui.app:app"', default="clan_cli.webui.app:app"
    )
    parser.add_argument("--app-dir", help="Directory containing the app", default=".")
    parser.add_argument(
        "--out", help="Output file ending in .json", default="tests", type=Path
    )
    args = parser.parse_args()

    if args.app_dir is not None:
        print(f"adding {args.app_dir} to sys.path")
        sys.path.insert(0, args.app_dir)

    print(f"importing app from {args.app}")
    app = import_from_string(args.app)
    openapi = app.openapi()
    version = openapi.get("openapi", "unknown version")

    print(f"writing openapi spec v{version}")
    with tempfile.TemporaryDirectory() as tmpdirname:

        tmp_dir = Path(tmpdirname)
        openapi_p = tmp_dir / "openapi.json"
        openapi_p.write_text(json.dumps(openapi, indent=2))

        gen_code = tmp_dir / "gen_code"

        print(f"generating python client to {args.out}")
        if not args.out.is_dir():
            raise Exception(f"{args.out} is not a directory")
        args.out.mkdir(parents=True, exist_ok=True)

        cmd = [
            "openapi-generator-cli",
            "generate",
            "-g",
            "python",
            "-o",
            f"{gen_code}",
            "-i",
            f"{openapi_p}",
        ]
        subprocess.run(cmd, check=True, text=True)

        dest_client: Path = args.out / "openapi_client"
        shutil.rmtree(dest_client, ignore_errors=True)
        shutil.copytree(gen_code / "openapi_client", dest_client)


if __name__ == "__main__":
    main()