import { app, BrowserWindow, Menu, Tray, nativeImage } from 'electron';
import { join } from 'node:path';
import { pathToFileURL } from 'node:url';
import { appUpdater } from '@electron/service/updater';
import configManager from '@electron/service/config-service';
import logManager from '@electron/service/logger';
import { windowManager } from '@electron/service/window-service';
import { createTranslator } from '@electron/utils';
import { CONFIG_KEYS, MAIN_WIN_SIZE, WINDOW_NAMES } from '@runtime/lib/constants';

declare const MAIN_WINDOW_VITE_DEV_SERVER_URL: string | undefined;

type GatewayStatus = 'connected' | 'disconnected' | 'reconnecting';

let tray: Tray | null = null;
let mainWindowRef: BrowserWindow | null = null;
let gatewayStatus: GatewayStatus = 'disconnected';
let removeLanguageListener: (() => void) | null = null;
let quitHookBound = false;
let t: ReturnType<typeof createTranslator> = createTranslator();

function getIconsDir(): string {
  if (app.isPackaged) {
    return join(process.resourcesPath, 'resources', 'icons');
  }

  return join(app.getAppPath(), 'resources', 'icons');
}

function resolveTrayIcon() {
  const iconsDir = getIconsDir();
  const iconPath = process.platform === 'win32'
    ? join(iconsDir, 'icon.ico')
    : process.platform === 'darwin'
      ? join(iconsDir, 'icon.png')
      : join(iconsDir, '32x32.png');

  let icon = nativeImage.createFromPath(iconPath);
  if (icon.isEmpty()) {
    icon = nativeImage.createFromPath(join(iconsDir, 'icon.png'));
  }

  if (process.platform === 'darwin' && !icon.isEmpty()) {
    icon.setTemplateImage(true);
  }

  return icon;
}

function getGatewayStatusLabelKey(status: GatewayStatus): string {
  switch (status) {
    case 'connected':
      return 'tray.status.running';
    case 'reconnecting':
      return 'tray.status.restarting';
    case 'disconnected':
    default:
      return 'tray.status.stopped';
  }
}

function rememberMainWindow(window: BrowserWindow | null | undefined): BrowserWindow | null {
  if (!window || window.isDestroyed()) {
    return null;
  }

  mainWindowRef = window;
  return window;
}

function buildMainWindowUrl(route: string): string {
  const normalizedHash = route.startsWith('#') ? route.slice(1) : route;

  if (MAIN_WINDOW_VITE_DEV_SERVER_URL) {
    const url = new URL(MAIN_WINDOW_VITE_DEV_SERVER_URL);
    url.pathname = '/';
    url.hash = normalizedHash;
    return url.toString();
  }

  const url = pathToFileURL(join(app.getAppPath(), 'dist', 'index.html'));
  url.hash = normalizedHash;
  return url.toString();
}

function resolveMainWindow(): BrowserWindow | null {
  const trackedWindow = rememberMainWindow(mainWindowRef);
  if (trackedWindow) {
    return trackedWindow;
  }

  const currentWindow = rememberMainWindow(windowManager.get(WINDOW_NAMES.MAIN));
  if (currentWindow) {
    return currentWindow;
  }

  return rememberMainWindow(windowManager.create(WINDOW_NAMES.MAIN, MAIN_WIN_SIZE));
}

function showMainWindow(): BrowserWindow | null {
  const mainWindow = resolveMainWindow();
  if (!mainWindow) {
    return null;
  }

  if (mainWindow.isMinimized()) {
    mainWindow.restore();
  }

  if (!mainWindow.isVisible()) {
    mainWindow.show();
  }

  mainWindow.focus();
  return mainWindow;
}

function navigateMainWindow(route: string): void {
  const mainWindow = showMainWindow();
  if (!mainWindow) {
    return;
  }

  const hashRoute = route.startsWith('#') ? route : `#${route}`;
  const applyRoute = () => {
    if (mainWindow.isDestroyed()) {
      return;
    }

    void mainWindow.webContents.executeJavaScript(
      `window.location.hash = ${JSON.stringify(hashRoute)};`,
      true,
    ).catch((error) => {
      logManager.warn(`Tray navigation fallback reload for ${hashRoute}`, error);
      void mainWindow.loadURL(buildMainWindowUrl(hashRoute));
    });
  };

  if (mainWindow.webContents.isLoadingMainFrame()) {
    mainWindow.webContents.once('did-finish-load', applyRoute);
    return;
  }

  applyRoute();
}

function toggleMainWindow(): void {
  const mainWindow = resolveMainWindow();
  if (!mainWindow) {
    return;
  }

  if (mainWindow.isVisible()) {
    mainWindow.hide();
    return;
  }

  showMainWindow();
}

function buildContextMenu() {
  const gatewayStatusLabel = t(getGatewayStatusLabelKey(gatewayStatus)) ?? gatewayStatus;

  return Menu.buildFromTemplate([
    {
      label: t('tray.showWindow') ?? 'Show Window',
      click: () => {
        showMainWindow();
      },
    },
    { type: 'separator' },
    {
      label: t('tray.gatewayStatus') ?? 'Gateway Status',
      enabled: false,
    },
    {
      label: gatewayStatusLabel,
      type: 'checkbox',
      checked: gatewayStatus === 'connected',
      enabled: false,
    },
    { type: 'separator' },
    {
      label: t('tray.quickActions') ?? 'Quick Actions',
      submenu: [
        {
          label: t('tray.openChat') ?? 'Open Chat',
          click: () => {
            navigateMainWindow('/home');
          },
        },
        {
          label: t('tray.openSettings') ?? 'Open Settings',
          click: () => {
            navigateMainWindow('/setting?view=general');
          },
        },
      ],
    },
    { type: 'separator' },
    {
      label: t('tray.checkForUpdates') ?? 'Check for Updates...',
      click: () => {
        void appUpdater.checkForUpdates();
      },
    },
    { type: 'separator' },
    {
      label: t('tray.quit') ?? 'Quit ZN-AI',
      click: () => {
        app.quit();
      },
    },
  ]);
}

function refreshTray(): void {
  if (!tray) {
    tray = new Tray(resolveTrayIcon());
  }

  const tooltip = [t('tray.tooltip') ?? 'ZN-AI', t(getGatewayStatusLabelKey(gatewayStatus)) ?? gatewayStatus]
    .filter(Boolean)
    .join(' - ');

  tray.setToolTip(tooltip);
  tray.setContextMenu(buildContextMenu());

  tray.removeAllListeners('click');
  tray.removeAllListeners('double-click');
  tray.on('click', toggleMainWindow);
  tray.on('double-click', () => {
    showMainWindow();
  });
}

function ensureLanguageListener(): void {
  if (removeLanguageListener) {
    return;
  }

  removeLanguageListener = configManager.onConfigChange((config) => {
    if (!config[CONFIG_KEYS.LANGUAGE]) {
      return;
    }

    t = createTranslator();
    if (tray) {
      refreshTray();
    }
  });
}

export function createTray(mainWindow: BrowserWindow): Tray {
  rememberMainWindow(mainWindow);
  ensureLanguageListener();
  refreshTray();

  if (!quitHookBound) {
    quitHookBound = true;
    app.once('before-quit', () => {
      destroyTray();
      quitHookBound = false;
    });
  }

  return tray as Tray;
}

export function updateTrayStatus(status: GatewayStatus): void {
  gatewayStatus = status;
  if (tray) {
    refreshTray();
  }
}

export function destroyTray(): void {
  tray?.destroy();
  tray = null;
  mainWindowRef = null;

  if (removeLanguageListener) {
    removeLanguageListener();
    removeLanguageListener = null;
  }
}