const { app, BrowserWindow, protocol, ipcMain } = require('electron');
const path = require('path');

app.commandLine.appendSwitch('enable-experimental-web-platform-features');
app.commandLine.appendSwitch('enable-web-bluetooth');
app.commandLine.appendSwitch('enable-features', 'WebBluetooth');

if (process.platform === 'linux') {
  app.commandLine.appendSwitch('disable-gpu-sandbox');
  app.commandLine.appendSwitch('no-sandbox');
  app.commandLine.appendSwitch('disable-seccomp-filter-sandbox');
  app.commandLine.appendSwitch('enable-logging');
  app.commandLine.appendSwitch('v', '1');
}

const isDev = process.env.ELECTRON_IS_DEV === '1';

let mainWindow;
let deepLinkUrl = null;
let bluetoothSelectCallback = null;
let discoveredDevices = new Map();

const gotTheLock = app.requestSingleInstanceLock();

if (!gotTheLock) {
  app.quit();
} else {
  app.on('second-instance', (event, commandLine) => {
    if (mainWindow) {
      if (mainWindow.isMinimized()) mainWindow.restore();
      mainWindow.focus();

      const url = commandLine.find(arg => arg.startsWith('rideaware://'));
      if (url) {
        handleDeepLink(url);
      }
    }
  });

  app.whenReady().then(() => {
    if (!isDev) {
      protocol.registerFileProtocol('rideaware', (request, callback) => {
        callback({ path: '' });
      });
    }

    createWindow();

    app.on('open-url', (event, url) => {
      event.preventDefault();
      handleDeepLink(url);
    });

    if (deepLinkUrl) {
      handleDeepLink(deepLinkUrl);
      deepLinkUrl = null;
    }
  });
}

app.on('open-url', (event, url) => {
  event.preventDefault();
  if (mainWindow) {
    handleDeepLink(url);
  } else {
    deepLinkUrl = url;
  }
});

if (process.platform !== 'darwin') {
  const url = process.argv.find(arg => arg.startsWith('rideaware://'));
  if (url) {
    deepLinkUrl = url;
  }
}

function createWindow() {
  mainWindow = new BrowserWindow({
    width: 1200,
    height: 900,
    minWidth: 800,
    minHeight: 600,
    webPreferences: {
      preload: path.join(__dirname, 'preload.cjs'),
      nodeIntegration: false,
      contextIsolation: true,
      enableBlinkFeatures: 'WebBluetooth',
      webSecurity: true,
      sandbox: process.platform !== 'linux',
    },
    backgroundColor: '#0a0a0a',
    show: false,
  });

  mainWindow.webContents.session.setPermissionCheckHandler((webContents, permission) => {
    if (permission === 'bluetooth') {
      return true;
    }
    return false;
  });

  mainWindow.webContents.session.setPermissionRequestHandler((webContents, permission, callback) => {
    if (permission === 'bluetooth') {
      callback(true);
    } else {
      callback(false);
    }
  });

  mainWindow.once('ready-to-show', () => {
    mainWindow.show();
  });

  if (isDev) {
    mainWindow.loadURL('http://localhost:5173');
    mainWindow.webContents.openDevTools();
  } else {
    mainWindow.loadFile(path.join(__dirname, '../dist/index.html'));
  }

  mainWindow.on('closed', () => {
    mainWindow = null;
  });

  mainWindow.webContents.setWindowOpenHandler(({ url }) => {
    require('electron').shell.openExternal(url);
    return { action: 'deny' };
  });

  mainWindow.webContents.on('select-bluetooth-device', (event, deviceList, callback) => {
    event.preventDefault();

    bluetoothSelectCallback = callback;

    deviceList.forEach((device) => {
      discoveredDevices.set(device.deviceId, {
        id: device.deviceId,
        name: device.deviceName || 'Unknown Device',
      });
    });

    const devices = Array.from(discoveredDevices.values());
    mainWindow.webContents.send('bluetooth:devices-updated', devices);
  });
}

ipcMain.on('bluetooth:select-device', (event, deviceId) => {
  if (bluetoothSelectCallback) {
    bluetoothSelectCallback(deviceId);
    bluetoothSelectCallback = null;
  }
});

ipcMain.on('bluetooth:cancel-selection', () => {
  if (bluetoothSelectCallback) {
    bluetoothSelectCallback('');
    bluetoothSelectCallback = null;
  }
  discoveredDevices.clear();
});

ipcMain.on('bluetooth:clear-devices', () => {
  discoveredDevices.clear();
});

function handleDeepLink(urlString) {
  if (!mainWindow) return;

  try {
    const parsedUrl = new URL(urlString);

    if (parsedUrl.protocol === 'rideaware:') {
      const action = parsedUrl.hostname;
      const params = {};

      parsedUrl.searchParams.forEach((value, key) => {
        params[key] = value;
      });

      mainWindow.webContents.send('deep-link', {
        action,
        params,
      });

      if (mainWindow.isMinimized()) mainWindow.restore();
      mainWindow.focus();
    }
  } catch (error) {
    console.error('Failed to parse deep link:', error);
  }
}

ipcMain.handle('get-version', () => {
  return app.getVersion();
});

ipcMain.handle('get-platform', () => {
  return process.platform;
});

ipcMain.handle('bluetooth:check-availability', async () => {
  return {
    available: true,
    platform: process.platform,
    flags: {
      webBluetooth: app.commandLine.hasSwitch('enable-web-bluetooth'),
      experimentalFeatures: app.commandLine.hasSwitch('enable-experimental-web-platform-features'),
    }
  };
});

ipcMain.handle('bluetooth:check-system', async () => {
  const { exec } = require('child_process');
  const { promisify } = require('util');
  const execAsync = promisify(exec);

  const result = {
    platform: process.platform,
    available: false,
    adapter: null,
    error: null,
    guidance: []
  };

  try {
    if (process.platform === 'linux') {
      try {
        const { stdout } = await execAsync('systemctl is-active bluetooth');
        result.available = stdout.trim() === 'active';

        if (result.available) {
          try {
            const { stdout: hciOutput } = await execAsync('hciconfig 2>&1');
            result.adapter = hciOutput.includes('UP RUNNING') ? 'enabled' : 'disabled';

            if (!hciOutput.includes('UP RUNNING')) {
              result.guidance.push('Bluetooth adapter is not powered on. Try: sudo hciconfig hci0 up');
            }
          } catch {
            result.adapter = 'unknown';
            result.guidance.push('Unable to check Bluetooth adapter status. Install bluez-utils if not present.');
          }
        } else {
          result.guidance.push('Bluetooth service is not running. Start it with: sudo systemctl start bluetooth');
        }
      } catch {
        result.available = false;
        result.guidance.push('Bluetooth service not found. Install bluez package.');
      }
    } else if (process.platform === 'darwin') {
      result.available = true;
      result.adapter = 'system';
    } else if (process.platform === 'win32') {
      result.available = true;
      result.adapter = 'system';
    }
  } catch (error) {
    result.error = error.message;
  }

  return result;
});

ipcMain.handle('minimize-window', () => {
  if (mainWindow) mainWindow.minimize();
});

ipcMain.handle('maximize-window', () => {
  if (mainWindow) {
    if (mainWindow.isMaximized()) {
      mainWindow.unmaximize();
    } else {
      mainWindow.maximize();
    }
  }
});

ipcMain.handle('close-window', () => {
  if (mainWindow) mainWindow.close();
});

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') {
    app.quit();
  }
});

app.on('activate', () => {
  if (BrowserWindow.getAllWindows().length === 0) {
    createWindow();
  }
});