#!/usr/bin/env python
"""
Djarea Desktop — PyWebView + Django local RPC.

Starts a local Django ASGI server and opens a native desktop window.
All communication between the UI and backend uses Djarea server functions.
"""

import os
import sys
import threading
import time

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "backend.settings")

# Work around Qt WebEngine GPU crashes on some systems
os.environ.setdefault("QTWEBENGINE_CHROMIUM_FLAGS", "--disable-gpu")


def start_server(host: str, port: int):
    """Start the Django ASGI server in a background thread."""
    import django

    django.setup()

    # Run migrations on first launch
    from django.core.management import call_command

    call_command("migrate", "--run-syncdb", verbosity=0)

    import uvicorn

    uvicorn.run(
        "backend.asgi:application",
        host=host,
        port=port,
        log_level="warning",
    )


def wait_for_server(url: str, timeout: float = 10.0):
    """Poll until the server responds."""
    from urllib.request import urlopen
    from urllib.error import URLError

    deadline = time.time() + timeout
    while time.time() < deadline:
        try:
            urlopen(url, timeout=1)
            return True
        except (URLError, OSError):
            time.sleep(0.1)
    return False


def main():
    host = "127.0.0.1"
    port = 8765

    # Start Django in a daemon thread
    server = threading.Thread(target=start_server, args=(host, port), daemon=True)
    server.start()

    base_url = f"http://{host}:{port}"

    if not wait_for_server(f"{base_url}/api/djarea/session/"):
        print("ERROR: Django server failed to start", file=sys.stderr)
        sys.exit(1)

    print(f"Backend running at {base_url}")

    # Check if --headless flag is passed (for testing)
    if "--headless" in sys.argv:
        print("Headless mode — server running. Press Ctrl+C to stop.")
        try:
            while True:
                time.sleep(1)
        except KeyboardInterrupt:
            pass
        return

    # Open native window
    import webview

    window = webview.create_window(
        title="Djarea Desktop",
        url=base_url,
        width=1024,
        height=768,
        min_size=(640, 480),
    )
    webview.start()


if __name__ == "__main__":
    main()