#!/usr/bin/env python3
"""Gemeinsame Launcher-Logik fuer Windows-Starter und macOS.

Unsichtbarer Ablauf: GStreamer vorhanden -> Engine im Hintergrund
starten, auf die Web-UI warten, Browser oeffnen.
Fehlt etwas -> grafischer Installer (installer_gui.py) oeffnen.
"""

from __future__ import annotations

import json
import subprocess
import sys
import time
import urllib.request
import webbrowser
from pathlib import Path

ROOT = Path(__file__).resolve().parent
IS_WIN = sys.platform == "win32"


def web_port() -> int:
    try:
        cfg = json.loads((ROOT / "config.json").read_text("utf-8"))
        return int(cfg.get("web", {}).get("port", 8080))
    except Exception:  # noqa: BLE001
        return 8080


def gst_ok() -> bool:
    try:
        import gi  # noqa: F401
        gi.require_version("Gst", "1.0")
        from gi.repository import Gst
        Gst.init(None)
        return True
    except Exception:  # noqa: BLE001
        return False


def _spawn(py: str, target: str, hidden: bool) -> None:
    if IS_WIN and hidden:
        subprocess.Popen(
            [py, str(ROOT / target)], cwd=str(ROOT),
            creationflags=0x08000000,  # CREATE_NO_WINDOW
            stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
    else:
        subprocess.Popen(
            [py, str(ROOT / target)], cwd=str(ROOT),
            stdout=open("/tmp/hms-mediaengine.log", "ab"),
            stderr=subprocess.STDOUT, start_new_session=not IS_WIN)


def wait_health(port: int, timeout_s: float = 25.0) -> bool:
    deadline = time.monotonic() + timeout_s
    while time.monotonic() < deadline:
        try:
            with urllib.request.urlopen(
                    f"http://localhost:{port}/api/health",
                    timeout=1.5) as r:
                if json.loads(r.read().decode()).get("status") == "ok":
                    return True
        except Exception:  # noqa: BLE001
            time.sleep(0.4)
    return False


def launch() -> int:
    if gst_ok():
        _spawn(sys.executable, "run.py", hidden=True)
        port = web_port()
        if wait_health(port):
            webbrowser.open(f"http://localhost:{port}")
            return 0
        print("[Launcher] Engine antwortete nicht rechtzeitig – "
              "oeffne Installer.", file=sys.stderr)
    _spawn(sys.executable, "installer_gui.py", hidden=False)
    return 1


if __name__ == "__main__":
    sys.exit(launch())