#!/usr/bin/env python3
import argparse
import os
import subprocess
from pathlib import Path

def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(description=f"Create a DMG installer.")
    parser.add_argument("-a", "--app-name")
    parser.add_argument("-i", "--icon-path", type=Path)
    return parser.parse_args()


def create_dmg(app_name: str, dmg_name: str, icon_path: Path, app_bundle_path: Path) -> None:
    subprocess.run(
        (
            "create-dmg",
            "--volname",
            f"{app_name} Installer",
            "--volicon",
            str(icon_path),
            "--window-pos",
            "200",
            "120",
            "--window-size",
            "800",
            "400",
            "--icon-size",
            "100",
            "--icon",
            f"{app_name}.app",
            "200",
            "190",
            "--hide-extension",
            f"{app_name}.app",
            "--app-drop-link",
            "600",
            "185",
            str(dmg_name),
            str(app_bundle_path),
        )
    )


def main() -> None:
    args = parse_args()

    dmg_name = Path(f"{args.app_name}-Installer.dmg")
    if dmg_name.is_file():
        dmg_name.unlink()

    app_bundle_path = Path(f"/tmp/{args.app_name}.app")
    create_dmg(args.app_name, dmg_name, args.icon_path, app_bundle_path)


if __name__ == "__main__":
    main()