import { app, BrowserWindow, ipcMain, dialog } from 'electron';
import { fileURLToPath } from 'url';
import path from 'path';
import fs from 'fs';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const SETTINGS_FILE = path.join(app.getPath('userData'), 'settings.json');

let mainWindow;

function loadSettings() {
  try {
    if (fs.existsSync(SETTINGS_FILE)) {
      return JSON.parse(fs.readFileSync(SETTINGS_FILE, 'utf-8'));
    }
  } catch (err) {
    console.error('Failed to load settings:', err);
  }
  return {};
}

function saveSettings(settings) {
  try {
    const current = loadSettings();
    const updated = { ...current, ...settings };
    fs.writeFileSync(SETTINGS_FILE, JSON.stringify(updated, null, 2));
  } catch (err) {
    console.error('Failed to save settings:', err);
  }
}

function createWindow() {
  const settings = loadSettings();
  const windowBounds = settings.windowBounds || { width: 1200, height: 800 };

  mainWindow = new BrowserWindow({
    x: windowBounds.x,
    y: windowBounds.y,
    width: windowBounds.width,
    height: windowBounds.height,
    minWidth: 1000,
    minHeight: 600,
    webPreferences: {
      preload: path.join(__dirname, 'preload.js'),
      contextIsolation: true,
      nodeIntegration: false,
    },
  });

  const isDev = process.env.NODE_ENV === 'development';

  if (isDev) {
    mainWindow.loadURL('http://localhost:5173');
    mainWindow.webContents.openDevTools();
  } else {
    // In production, use app.getAppPath() to correctly resolve the ASAR root
    const appPath = app.getAppPath();
    mainWindow.loadFile(path.join(appPath, 'dist/index.html'));
  }

  // Persist window bounds on change
  const saveBounds = () => {
    const bounds = mainWindow.getBounds();
    saveSettings({ windowBounds: bounds });
  };
  mainWindow.on('resize', saveBounds);
  mainWindow.on('move', saveBounds);
}

app.whenReady().then(() => {
  createWindow();

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

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

// Settings Handlers
ipcMain.handle('get-settings', async () => {
  return loadSettings();
});

ipcMain.handle('update-settings', async (event, settings) => {
  saveSettings(settings);
  return { success: true };
});

// IPC Handler for Image Export
// IPC Handler for Image/PDF/HTML Export
ipcMain.handle('save-image', async (event, dataUrl, format) => {
  const isPdf = format === 'pdf';
  const isHtml = format === 'html';

  let filters = [{ name: 'Images', extensions: [format] }];
  if (isPdf) filters = [{ name: 'PDF Documents', extensions: ['pdf'] }];
  if (isHtml) filters = [{ name: 'HTML Files', extensions: ['html'] }];

  const { canceled, filePath } = await dialog.showSaveDialog(mainWindow, {
    title: isPdf ? 'Save PDF' : (isHtml ? 'Save HTML' : 'Save Image'),
    defaultPath: `export.${format}`,
    filters: filters,
  });

  if (canceled || !filePath) {
    return { success: false, message: 'Cancelled' };
  }

  // Remove header (e.g., "data:image/png;base64," or "data:application/pdf;base64," or "data:text/html;base64,")
  const base64Data = dataUrl.replace(/^data:(image\/\w+|application\/pdf|text\/html);base64,/, '');

  try {
    fs.writeFileSync(filePath, base64Data, 'base64');
    return { success: true, filePath };
  } catch (error) {
    console.error('Failed to save file:', error);
    return { success: false, message: error.message };
  }
});

// IPC Handler for HTML Import
ipcMain.handle('open-file', async () => {
  const { canceled, filePaths } = await dialog.showOpenDialog(mainWindow, {
    title: 'Open HTML File',
    filters: [{ name: 'HTML Files', extensions: ['html'] }],
    properties: ['openFile']
  });

  if (canceled || filePaths.length === 0) {
    return { success: false, message: 'Cancelled' };
  }

  try {
    const content = fs.readFileSync(filePaths[0], 'utf-8');
    return { success: true, content, filePath: filePaths[0] };
  } catch (error) {
    console.error('Failed to open file:', error);
    return { success: false, message: error.message };
  }
});