#!/usr/bin/env python3
"""Installed VoicePult desktop launcher. No third-party dependencies."""
import argparse
import json
import os
from pathlib import Path
import subprocess
import sys
import time
import urllib.error
import urllib.request

ROOT = Path(__file__).resolve().parent
URL = 'http://127.0.0.1:8765'


def status():
    try:
        # Localhost should not pass through a user's HTTP proxy.
        opener = urllib.request.build_opener(urllib.request.ProxyHandler({}))
        with opener.open(URL + '/api/state', timeout=2) as response:
            data = json.load(response)
        if isinstance(data, dict) and data.get('virtual_mic') == 'VoicePult Mikrofon' and 'channels' in data:
            return data
    except (OSError, ValueError, urllib.error.URLError):
        pass
    return None


def main():
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('--serve', action='store_true')
    parser.add_argument('--background', action='store_true')
    args = parser.parse_args()
    meta = json.loads((ROOT / 'install.json').read_text())
    config = Path(meta['config'])
    command = [sys.executable, str(ROOT / 'server.py'), '--config', str(config)]
    if meta.get('lan'):
        command.append('--lan')
    if args.serve:
        os.execv(sys.executable, command)
    if status() is None:
        service_started = False
        if meta['systemd']:
            result = subprocess.run(['systemctl', '--user', 'start', 'voicepult.service'], capture_output=True)
            service_started = result.returncode == 0
        if not service_started:
            log = Path(meta['log'])
            log.parent.mkdir(parents=True, exist_ok=True)
            with log.open('ab') as output:
                subprocess.Popen(command, stdin=subprocess.DEVNULL, stdout=output,
                                 stderr=output, start_new_session=True, cwd=ROOT)
        for _ in range(40):
            if status() is not None:
                break
            time.sleep(.25)
        else:
            log_hint = 'journalctl --user -u voicepult.service' if meta['systemd'] else meta['log']
            raise RuntimeError('VoicePult startet nicht. Eventuell läuft bereits eine andere Instanz oder Port 8765 ist belegt. Protokoll: ' + log_hint)
    if not args.background:
        subprocess.run(['xdg-open', URL], check=True)
    return 0


if __name__ == '__main__':
    try:
        sys.exit(main())
    except (OSError, ValueError, RuntimeError, subprocess.CalledProcessError) as exc:
        print('VoicePult: ' + str(exc), file=sys.stderr)
        # Desktop launchers usually have no visible terminal.
        try:
            subprocess.run(['notify-send', 'VoicePult konnte nicht geöffnet werden', str(exc)], check=False)
        except OSError:
            pass
        sys.exit(1)