const express = require('express');
const { streamHandler } = require('./src/streamHandler');
const { geocodeCity } = require('./src/geocode');
const { getAllMusicFiles, initializeSharedPlaylist } = require('./src/musicPlaylist');

const app = express();
const PORT = process.env.PORT || 3000;
const WS4KP_PORT = process.env.WS4KP_PORT || 8080;
const MUSIC_PATH = process.env.MUSIC_PATH || '/music';
const DEFAULT_FPS = parseInt(process.env.DEFAULT_FPS || '30');
const SCREENSHOT_FORMAT = process.env.SCREENSHOT_FORMAT || 'jpeg';
const SCREENSHOT_QUALITY = parseInt(process.env.SCREENSHOT_QUALITY || '95');
const DEBUG_MODE = process.env.DEBUG_MODE === 'true';

/**
 * Build WS4KP weather URL with given coordinates and settings
 */
function buildWeatherUrl(latitude, longitude, settings) {
  const {
    city,
    showHazards,
    showCurrent,
    showLatestObservations,
    showHourly,
    showHourlyGraph,
    showTravel,
    showRegionalForecast,
    showLocalForecast,
    showExtendedForecast,
    showAlmanac,
    showRadar,
    showMarineForecast,
    showAQI,
    units,
    timeFormat
  } = settings;

  const isMetric = units.toLowerCase() === 'metric';
  const temperatureUnit = isMetric ? '1.00' : '2.00';
  const windUnit = isMetric ? '1.00' : '2.00';
  const distanceUnit = isMetric ? '1.00' : '2.00';
  const pressureUnit = isMetric ? '1.00' : '2.00';
  const hoursFormat = timeFormat === '12h' ? '1.00' : '2.00';

  const ws4kpPort = process.env.WS4KP_PORT || 8080;
  const ws4kpBaseUrl = process.env.WS4KP_URL || `http://localhost:${ws4kpPort}`;

  const ws4kpParams = new URLSearchParams({
    'hazards-checkbox': showHazards,
    'current-weather-checkbox': showCurrent,
    'latest-observations-checkbox': showLatestObservations,
    'hourly-checkbox': showHourly,
    'hourly-graph-checkbox': showHourlyGraph,
    'travel-checkbox': showTravel,
    'regional-forecast-checkbox': showRegionalForecast,
    'local-forecast-checkbox': showLocalForecast,
    'extended-forecast-checkbox': showExtendedForecast,
    'almanac-checkbox': showAlmanac,
    'radar-checkbox': showRadar,
    'marine-forecast-checkbox': showMarineForecast,
    'aqi-forecast-checkbox': showAQI,
    'settings-experimentalFeatures-checkbox': 'false',
    'settings-hideWebamp-checkbox': 'true',
    'settings-kiosk-checkbox': 'false',
    'settings-scanLines-checkbox': 'false',
    'settings-wide-checkbox': 'true',
    'chkAutoRefresh': 'true',
    'settings-windUnits-select': windUnit,
    'settings-marineWindUnits-select': '1.00',
    'settings-marineWaveHeightUnits-select': '1.00',
    'settings-temperatureUnits-select': temperatureUnit,
    'settings-distanceUnits-select': distanceUnit,
    'settings-pressureUnits-select': pressureUnit,
    'settings-hoursFormat-select': hoursFormat,
    'settings-speed-select': '1.00',
    'latLonQuery': city,
    'latLon': JSON.stringify({ lat: latitude, lon: longitude }),
    'kiosk': 'true'
  });

  return `${ws4kpBaseUrl}/?${ws4kpParams.toString()}`;
}

// Basic stream endpoint (with optional music and scroll parameters)
app.get('/stream', (req, res) => {
  const { music = 'false', debug = DEBUG_MODE ? 'true' : 'false' } = req.query;
  const useMusic = music === 'true';
  const startTime = Date.now();
  streamHandler(req, res, {
    useMusic,
    musicPath: MUSIC_PATH,
    startTime,
    defaultFps: DEFAULT_FPS,
    screenshotFormat: SCREENSHOT_FORMAT,
    screenshotQuality: SCREENSHOT_QUALITY,
    debugMode: debug === 'true'
  });
});

// Weather endpoint (with music)
app.get('/weather', async (req, res) => {
  const {
    city = 'Toronto, ON, CAN',
    width = 1920,
    height = 1080,
    fps = 30,
    hideLogo = 'false',
    units = 'metric',
    timeFormat = '24h',
    showHazards = 'true',
    showCurrent = 'true',
    showHourly = 'true',
    showHourlyGraph = 'true',
    showLocalForecast = 'true',
    showExtendedForecast = 'true',
    showRadar = 'true',
    showAQI = 'true',
    showAlmanac = 'true',
    showLatestObservations = 'false',
    showRegionalForecast = 'false',
    showTravel = 'false',
    showMarineForecast = 'false'
  } = req.query;

  const weatherSettings = {
    city,
    showHazards,
    showCurrent,
    showLatestObservations,
    showHourly,
    showHourlyGraph,
    showTravel,
    showRegionalForecast,
    showLocalForecast,
    showExtendedForecast,
    showAlmanac,
    showRadar,
    showMarineForecast,
    showAQI,
    units,
    timeFormat
  };

  // Generate session ID for logging
  const sessionId = Math.floor(Math.random() * 100000);
  
  let lateGeocodePromise = null;
  let geocodeDataPromise = null;
  let initialUrl = 'data:text/html,<html><body style="margin:0;padding:0;background:#000"></body></html>';

  if (city && city !== 'Toronto, ON, CAN') {
    // Start geocoding in background - don't wait for it
    const geocodePromise = geocodeCity(city, sessionId);
    geocodeDataPromise = geocodePromise; // Save for city name overlay
    
    // Always start with black screen immediately
    initialUrl = 'data:text/html,<html><body style="margin:0;padding:0;background:#000"></body></html>';
    
    // Late geocode promise will load the actual weather page
    lateGeocodePromise = geocodePromise.then(geoResult => {
      return buildWeatherUrl(geoResult.lat, geoResult.lon, weatherSettings);
    }).catch(err => {
      console.warn(`Geocoding failed for ${city}, using fallback`);
      // Fallback to Toronto
      return buildWeatherUrl(43.6532, -79.3832, weatherSettings);
    });
  } else {
    // Toronto default
    initialUrl = buildWeatherUrl(43.6532, -79.3832, weatherSettings);
    // Create resolved promise with Toronto data
    geocodeDataPromise = Promise.resolve({ cityName: 'Toronto' });
  }

  const startTime = Date.now();

  // Update request query for stream handler
  req.query.url = initialUrl;
  req.query.width = width;
  req.query.height = height;
  req.query.fps = fps;
  req.query.hideLogo = hideLogo;

  // Call stream handler with music enabled
  const { debug = DEBUG_MODE ? 'true' : 'false' } = req.query;
  
  // Build request path for logging
  const requestPath = `/weather?city=${encodeURIComponent(city)}`;
  
  return streamHandler(req, res, {
    useMusic: true,
    musicPath: MUSIC_PATH,
    lateGeocodePromise,
    geocodeDataPromise,
    startTime,
    defaultFps: DEFAULT_FPS,
    screenshotFormat: SCREENSHOT_FORMAT,
    screenshotQuality: SCREENSHOT_QUALITY,
    debugMode: debug === 'true',
    sessionId,
    requestPath
  });
});

// Health check endpoint
app.get('/health', (req, res) => {
  res.send('OK');
});

// Start server
app.listen(PORT, () => {
  console.log(`Webpage to HLS server running on port ${PORT}`);
  if (process.env.WS4KP_EXTERNAL_PORT) {
    console.log(`WS4KP weather service on port ${process.env.WS4KP_EXTERNAL_PORT}`);
  }
  console.log(`\nConfiguration:`);
  console.log(`  Default FPS: ${DEFAULT_FPS}`);
  console.log(`  Screenshot Format: ${SCREENSHOT_FORMAT}`);
  console.log(`  Screenshot Quality: ${SCREENSHOT_QUALITY}${SCREENSHOT_FORMAT === 'jpeg' ? '%' : ' (ignored for PNG)'}`);
  console.log(`\nUsage: http://localhost:${PORT}/stream?url=http://example.com`);
  console.log(`Weather: http://localhost:${PORT}/weather?city=YourCity`);
  
  // Pre-validate music files on startup to cache results
  if (MUSIC_PATH) {
    console.log(`\nInitializing music library at ${MUSIC_PATH}...`);
    const validFiles = getAllMusicFiles(MUSIC_PATH);
    if (validFiles.length > 0) {
      console.log(`Music library ready: ${validFiles.length} tracks validated`);
      // Initialize shared playlist at startup
      initializeSharedPlaylist(MUSIC_PATH);
      console.log('');
    } else {
      console.log(`Warning: No valid music files found in ${MUSIC_PATH}\n`);
    }
  }
});