import {
  app,
  BrowserWindow,
  ipcMain,
  Menu,
  nativeTheme,
  shell,
  utilityProcess,
} from 'electron';
import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath, pathToFileURL } from 'node:url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const brandName = 'TrueGrowth';
const rendererUrl = process.env.VITE_DEV_SERVER_URL;
const localApiPort = Number(process.env.TRUEGROWTH_LOCAL_API_PORT || 48177);
const userDataPath =
  process.env.TRUEGROWTH_ELECTRON_USER_DATA ||
  path.join(app.getPath('appData'), brandName);
const isDev = Boolean(rendererUrl);
const appRoot = app.isPackaged
  ? app.getAppPath()
  : path.resolve(__dirname, '../..');
const brandIconPath = resolveAppPath(
  'apps/electron/assets/truegrowth-dock-icon.png'
);

let mainWindow = null;
let localApi = null;

function readAppVersion() {
  try {
    const packageInfo = JSON.parse(
      fs.readFileSync(resolveAppPath('package.json'), 'utf8')
    );
    return packageInfo.version || app.getVersion();
  } catch {
    return app.getVersion();
  }
}

const appVersion = readAppVersion();

function resolveAppPath(...segments) {
  return path.join(appRoot, ...segments);
}

function createDesktopLocalRendererEntry(indexHtmlPath) {
  const html = fs.readFileSync(indexHtmlPath, 'utf8');
  const appAssetPattern =
    /https:\/\/cdn\.jsdelivr\.net\/npm\/aitu-app@[^/"'>\s]+\/([^"'<>\s]+)/g;

  return html.replace(appAssetPattern, (_url, assetPath) => `./${assetPath}`);
}

process.title = brandName;
app.setName(brandName);
app.setAppUserModelId('ai.truegrowth.desktop');
app.setPath('userData', userDataPath);
process.env.TRUEGROWTH_ELECTRON_USER_DATA = userDataPath;
process.env.TRUEGROWTH_RUNTIME_STATE_DIR =
  process.env.TRUEGROWTH_RUNTIME_STATE_DIR ||
  path.join(userDataPath, 'runtime');
if (!isDev) {
  process.env.TRUEGROWTH_DESKTOP_PACKAGED =
    process.env.TRUEGROWTH_DESKTOP_PACKAGED || '1';
}
process.env.TRUEGROWTH_DESKTOP_APP_ROOT =
  process.env.TRUEGROWTH_DESKTOP_APP_ROOT || appRoot;
process.env.TRUEGROWTH_DESKTOP_RESOURCE_DIR =
  process.env.TRUEGROWTH_DESKTOP_RESOURCE_DIR ||
  (app.isPackaged ? process.resourcesPath : appRoot);

  const hasSingleInstanceLock = app.requestSingleInstanceLock({
    rendererUrl,
  userDataPath,
});

if (!hasSingleInstanceLock) {
  app.quit();
  process.exit(0);
}

app.on('second-instance', () => {
  if (!mainWindow) {
    return;
  }
  if (mainWindow.isMinimized()) {
    mainWindow.restore();
  }
  mainWindow.focus();
  mainWindow.show();
});

function getWindowState(window) {
  return {
    isFullScreen: window?.isFullScreen?.() ?? false,
    isMaximized: window?.isMaximized?.() ?? false,
    platform: process.platform,
  };
}

function getSystemThemeState() {
  const theme = nativeTheme.shouldUseDarkColors ? 'dark' : 'light';
  return {
    theme,
    shouldUseDarkColors: theme === 'dark',
    source: 'system',
  };
}

function sendWindowState(window) {
  if (!window || window.isDestroyed()) {
    return;
  }
  window.webContents.send('truegrowth-window:state', getWindowState(window));
}

function sendSystemThemeState(window) {
  if (!window || window.isDestroyed()) {
    return;
  }
  const systemTheme = getSystemThemeState();
  window.setBackgroundColor(
    systemTheme.theme === 'dark' ? '#060606' : '#f7f7f5'
  );
  window.webContents.send('truegrowth-theme:system', systemTheme);
}

function getWindowFromIpcEvent(event) {
  const window = BrowserWindow.fromWebContents(event.sender);
  return window && !window.isDestroyed() ? window : null;
}

function installWindowControlsIpc() {
  ipcMain.handle('truegrowth-window:minimize', (event) => {
    const window = getWindowFromIpcEvent(event);
    window?.minimize();
    return window ? getWindowState(window) : getWindowState(mainWindow);
  });

  ipcMain.handle('truegrowth-window:toggle-maximize', (event) => {
    const window = getWindowFromIpcEvent(event);
    if (!window) {
      return getWindowState(mainWindow);
    }
    if (window.isFullScreen()) {
      window.setFullScreen(false);
    } else if (window.isMaximized()) {
      window.unmaximize();
    } else {
      window.maximize();
    }
    return getWindowState(window);
  });

  ipcMain.handle('truegrowth-window:close', (event) => {
    const window = getWindowFromIpcEvent(event);
    window?.close();
    return { closed: Boolean(window) };
  });

  ipcMain.handle('truegrowth-window:is-maximized', (event) => {
    const window = getWindowFromIpcEvent(event);
    return getWindowState(window || mainWindow);
  });
}

function installThemeIpc() {
  ipcMain.handle('truegrowth-theme:get-system', () => getSystemThemeState());

  nativeTheme.on('updated', () => {
    BrowserWindow.getAllWindows().forEach(sendSystemThemeState);
  });
}

function installApplicationMenu() {
  const editMenu = [
    { role: 'undo' },
    { role: 'redo' },
    { type: 'separator' },
    { role: 'cut' },
    { role: 'copy' },
    { role: 'paste' },
    { role: 'selectAll' },
  ];
  const viewMenu = [
    { role: 'reload' },
    { role: 'forceReload' },
    { role: 'toggleDevTools' },
    { type: 'separator' },
    { role: 'resetZoom' },
    { role: 'zoomIn' },
    { role: 'zoomOut' },
    { type: 'separator' },
    { role: 'togglefullscreen' },
  ];
  const windowMenu = [
    { role: 'minimize' },
    { role: 'zoom' },
    ...(process.platform === 'darwin'
      ? [{ type: 'separator' }, { role: 'front' }]
      : [{ role: 'close' }]),
  ];
  const template = [
    ...(process.platform === 'darwin'
      ? [
          {
            label: brandName,
            submenu: [
              { role: 'about', label: `About ${brandName}` },
              { type: 'separator' },
              { role: 'services' },
              { type: 'separator' },
              { role: 'hide', label: `Hide ${brandName}` },
              { role: 'hideOthers' },
              { role: 'unhide' },
              { type: 'separator' },
              { role: 'quit', label: `Quit ${brandName}` },
            ],
          },
        ]
      : []),
    {
      label: 'File',
      submenu: [
        process.platform === 'darwin' ? { role: 'close' } : { role: 'quit' },
      ],
    },
    { label: 'Edit', submenu: editMenu },
    { label: 'View', submenu: viewMenu },
    { label: 'Window', submenu: windowMenu },
    { label: 'Help', submenu: [] },
  ];

  Menu.setApplicationMenu(Menu.buildFromTemplate(template));
}

function createWindow() {
  const initialSystemTheme = getSystemThemeState().theme;

  mainWindow = new BrowserWindow({
    width: 1440,
    height: 920,
    minWidth: 1180,
    minHeight: 760,
    title: brandName,
    icon: brandIconPath,
    frame: false,
    autoHideMenuBar: true,
    backgroundColor: initialSystemTheme === 'dark' ? '#060606' : '#f7f7f5',
    webPreferences: {
      preload: resolveAppPath('apps/electron/preload.cjs'),
      contextIsolation: true,
      nodeIntegration: false,
      sandbox: false,
    },
  });

  if (process.platform !== 'darwin') {
    mainWindow.setMenuBarVisibility(false);
  }

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

  [
    'enter-full-screen',
    'leave-full-screen',
    'maximize',
    'resize',
    'restore',
    'unmaximize',
  ].forEach((eventName) => {
    mainWindow.on(eventName, () => sendWindowState(mainWindow));
  });

  mainWindow.webContents.once('did-finish-load', () => {
    sendWindowState(mainWindow);
    sendSystemThemeState(mainWindow);
  });

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

  if (isDev && rendererUrl) {
    void mainWindow.loadURL(rendererUrl);
    return;
  }

  const indexHtmlPath = resolveAppPath('dist/apps/web/index.html');
  const entryHtml = createDesktopLocalRendererEntry(indexHtmlPath);

  void mainWindow.loadURL(
    `data:text/html;charset=utf-8,${encodeURIComponent(entryHtml)}`,
    {
      baseURLForDataURL: `${pathToFileURL(
        path.dirname(indexHtmlPath)
      ).toString()}/`,
    }
  );
}

async function startLocalApi() {
  const { createLocalApiServer } = await import(
    pathToFileURL(resolveAppPath('scripts/truegrowth-local-api.mjs')).toString()
  );
  localApi = createLocalApiServer({ utilityProcess });
  localApi.on('error', (error) => {
    if (error?.code === 'EADDRINUSE') {
      console.log(
        `TrueGrowth local API already available at http://127.0.0.1:${localApiPort}`
      );
      return;
    }
    throw error;
  });
  localApi.listen(localApiPort, '127.0.0.1', () => {
    console.log(
      `TrueGrowth local API listening at http://127.0.0.1:${localApiPort}`
    );
  });
}

app.whenReady().then(async () => {
  installApplicationMenu();
  installWindowControlsIpc();
  installThemeIpc();
  if (process.platform === 'darwin' && app.dock) {
    app.dock.setIcon(brandIconPath);
  }
  app.setAboutPanelOptions({
    applicationName: brandName,
    applicationVersion: appVersion,
    iconPath: brandIconPath,
    copyright: `Copyright © ${new Date().getFullYear()} TrueGrowth`,
  });
  await startLocalApi();
  createWindow();

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

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

app.on('before-quit', () => {
  localApi?.close();
});