import { app, BrowserWindow, shell, ipcMain, dialog, nativeTheme, globalShortcut, clipboard } from 'electron';
import path from 'path';
import { fileURLToPath, pathToFileURL } from 'url';
import fs from 'fs';
import log from 'electron-log';
import { generatePdf } from './services/pdfGenerator';
import { selectHtmlFile } from './services/htmlImport';
import { electronState } from './state';

log.initialize();

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

process.env.NOTEBOOK_ROOT = path.join(app.getPath('documents'), 'XCDesktop');

if (!fs.existsSync(process.env.NOTEBOOK_ROOT)) {
  try {
    fs.mkdirSync(process.env.NOTEBOOK_ROOT, { recursive: true });
  } catch (err) {
    log.error('Failed to create notebook directory:', err);
  }
}

electronState.setDevelopment(!app.isPackaged);

let lastClipboardText = '';

function startClipboardWatcher() {
  lastClipboardText = clipboard.readText();
  
  setInterval(() => {
    try {
      const currentText = clipboard.readText();
      if (currentText && currentText !== lastClipboardText) {
        lastClipboardText = currentText;
        log.info('Clipboard changed, syncing to remote');
        const win = electronState.getMainWindow();
        if (win) {
          win.webContents.send('remote-clipboard-auto-sync', currentText);
        }
      }
    } catch (e) {
      // ignore
    }
  }, 1000);
}

async function createWindow() {
  const initialSymbolColor = nativeTheme.shouldUseDarkColors ? '#ffffff' : '#000000';
  
  const mainWindow = new BrowserWindow({
    width: 1280,
    height: 800,
    minWidth: 1600,
    minHeight: 900,
    autoHideMenuBar: true,
    titleBarStyle: 'hidden',
    titleBarOverlay: {
      color: '#00000000',
      symbolColor: initialSymbolColor,
      height: 32,
    },
    webPreferences: {
      nodeIntegration: false,
      contextIsolation: true,
      sandbox: false,
      webviewTag: true,
      preload: path.join(__dirname, 'preload.cjs'),
    },
  });

  electronState.setMainWindow(mainWindow);
  mainWindow.setMenu(null);

  mainWindow.webContents.setWindowOpenHandler(({ url }) => {
    if (url.startsWith('http:') || url.startsWith('https:')) {
      shell.openExternal(url);
      return { action: 'deny' };
    }
    return { action: 'allow' };
  });

  if (electronState.isDevelopment()) {
    log.info('Loading development URL...');
    try {
      await mainWindow.loadURL('http://localhost:5173');
    } catch (e) {
      log.error('Failed to load dev URL. Make sure npm run electron:dev is used.', e);
    }
    mainWindow.webContents.openDevTools();
  } else {
    log.info(`Loading production URL with port ${electronState.getServerPort()}...`);
    await mainWindow.loadURL(`http://localhost:${electronState.getServerPort()}`);
  }
}

ipcMain.handle('export-pdf', async (event, title, htmlContent) => {
  const win = BrowserWindow.fromWebContents(event.sender);
  if (!win) return { success: false, error: 'No window found' };

  try {
    const { filePath } = await dialog.showSaveDialog(win, {
      title: '导出 PDF',
      defaultPath: `${title}.pdf`,
      filters: [{ name: 'PDF Files', extensions: ['pdf'] }]
    });

    if (!filePath) return { success: false, canceled: true };

    if (!htmlContent) {
      throw new Error('No HTML content provided for PDF export');
    }

    const pdfData = await generatePdf(htmlContent);
    fs.writeFileSync(filePath, pdfData);

    return { success: true, filePath };
  } catch (error: any) {
    log.error('Export PDF failed:', error);
    return { success: false, error: error.message };
  }
});

ipcMain.handle('select-html-file', async (event) => {
  const win = BrowserWindow.fromWebContents(event.sender);
  return selectHtmlFile(win);
});

ipcMain.handle('update-titlebar-buttons', async (event, symbolColor: string) => {
  const win = BrowserWindow.fromWebContents(event.sender);
  if (win) {
    win.setTitleBarOverlay({ symbolColor });
    return { success: true };
  }
  return { success: false };
});

ipcMain.handle('clipboard-read-text', async () => {
  try {
    const text = clipboard.readText();
    return { success: true, text };
  } catch (error: any) {
    log.error('Clipboard read failed:', error);
    return { success: false, error: error.message };
  }
});

ipcMain.handle('clipboard-write-text', async (event, text: string) => {
  try {
    clipboard.writeText(text);
    return { success: true };
  } catch (error: any) {
    log.error('Clipboard write failed:', error);
    return { success: false, error: error.message };
  }
});

ipcMain.handle('remote-fetch-drives', async (_event, serverHost: string, port: number, password?: string) => {
  try {
    let url = `http://${serverHost}:${port}/api/files/drives`;
    if (password) {
      url += `?password=${encodeURIComponent(password)}`;
    }
    const response = await fetch(url);
    if (!response.ok) {
      throw new Error(`Failed to fetch drives: ${response.statusText}`);
    }
    const data = await response.json();
    const items = data.items || [];
    return {
      success: true,
      data: items.map((item: { name: string; isDirectory: boolean; size: number }) => ({
        name: item.name,
        path: item.name,
        type: item.isDirectory ? 'dir' : 'file',
        size: item.size,
        modified: '',
      }))
    };
  } catch (error: any) {
    log.error('Remote fetch drives failed:', error);
    return { success: false, error: error.message };
  }
});

ipcMain.handle('remote-fetch-files', async (_event, serverHost: string, port: number, filePath: string, password?: string) => {
  try {
    let url = `http://${serverHost}:${port}/api/files/browse?path=${encodeURIComponent(filePath)}&allowSystem=true`;
    if (password) {
      url += `&password=${encodeURIComponent(password)}`;
    }
    const response = await fetch(url);
    if (!response.ok) {
      throw new Error(`Failed to fetch files: ${response.statusText}`);
    }
    const data = await response.json();
    const items = data.items || [];
    return {
      success: true,
      data: items.map((item: { name: string; isDirectory: boolean; size: number; modified: Date }) => ({
        name: item.name,
        path: data.currentPath ? `${data.currentPath}/${item.name}` : item.name,
        type: item.isDirectory ? 'dir' : 'file',
        size: item.size,
        modified: item.modified?.toString(),
      }))
    };
  } catch (error: any) {
    log.error('Remote fetch files failed:', error);
    return { success: false, error: error.message };
  }
});

ipcMain.handle('remote-upload-file', async (_event, serverHost: string, port: number, filePath: string, remotePath: string, password?: string) => {
  try {
    const win = electronState.getMainWindow();
    if (!win) {
      throw new Error('No window found');
    }

    const fullPath = path.resolve(filePath);
    if (!fs.existsSync(fullPath)) {
      throw new Error('File not found');
    }

    const fileBuffer = fs.readFileSync(fullPath);
    const fileName = path.basename(fullPath);

    let url = `http://${serverHost}:${port}/api/files/upload`;
    if (password) {
      url += `?password=${encodeURIComponent(password)}`;
    }

    const formData = new FormData();
    const blob = new Blob([fileBuffer]);
    formData.append('file', blob, fileName);
    if (remotePath) {
      formData.append('path', remotePath);
    }

    const response = await fetch(url, {
      method: 'POST',
      body: formData,
    });

    if (!response.ok) {
      throw new Error(`Upload failed: ${response.statusText}`);
    }

    return { success: true };
  } catch (error: any) {
    log.error('Remote upload failed:', error);
    return { success: false, error: error.message };
  }
});

ipcMain.handle('remote-download-file', async (_event, id: string, serverHost: string, port: number, fileName: string, remotePath: string, localPath: string, password?: string) => {
  try {
    log.info('Remote download params:', { id, serverHost, port, fileName, remotePath, localPath, password });
    
    const win = electronState.getMainWindow();
    if (!win) {
      throw new Error('No window found');
    }

    const fullRemotePath = remotePath ? `${remotePath}\\${fileName}` : fileName;
    let url = `http://${serverHost}:${port}/api/files/${encodeURIComponent(fullRemotePath)}`;
    if (password) {
      url += `?password=${encodeURIComponent(password)}`;
    }

    const response = await fetch(url);
    if (!response.ok) {
      throw new Error(`Download failed: ${response.statusText}`);
    }

    const contentLength = response.headers.get('Content-Length');
    if (!contentLength) {
      throw new Error('Server did not return Content-Length');
    }

    const totalSize = parseInt(contentLength, 10);
    const targetDir = localPath || 'C:\\';
    const targetPath = path.join(targetDir, fileName);

    if (!fs.existsSync(targetDir)) {
      fs.mkdirSync(targetDir, { recursive: true });
    }

    const fileStream = fs.createWriteStream(targetPath);
    const reader = response.body?.getReader();
    if (!reader) {
      throw new Error('Failed to get response body reader');
    }

    let downloadedSize = 0;
    const CHUNK_SIZE = 64 * 1024;

    while (true) {
      const { done, value } = await reader.read();
      if (done) {
        break;
      }

      if (value) {
        downloadedSize += value.length;
        fileStream.write(value);

        const progress = Math.round((downloadedSize / totalSize) * 100);
        win.webContents.send('download-progress', { id, progress });
      }
    }

    fileStream.end();
    return { success: true, filePath: targetPath };
  } catch (error: any) {
    log.error('Remote download failed:', error);
    return { success: false, error: error.message };
  }
});

async function startServer() {
  if (electronState.isDevelopment()) {
    log.info('In dev mode, assuming external servers are running.');
    return;
  }

  const serverPath = path.join(__dirname, '../dist-api/server.js');
  const serverUrl = pathToFileURL(serverPath).href;

  log.info(`Starting internal server from: ${serverPath}`);
  try {
    const serverModule = await import(serverUrl);
    if (serverModule.startServer) {
      const port = await serverModule.startServer();
      electronState.setServerPort(port);
      log.info(`Internal server started successfully on port ${port}`);
    } else {
      log.warn('startServer function not found in server module, using default port 3001');
    }
  } catch (e) {
    log.error('Failed to start internal server:', e);
  }
}

app.whenReady().then(async () => {
  await startServer();
  await createWindow();

  startClipboardWatcher();

  globalShortcut.register('CommandOrControl+Shift+C', () => {
    log.info('Global shortcut: sync clipboard to remote');
    const win = electronState.getMainWindow();
    if (win) {
      win.webContents.send('remote-clipboard-sync-to-remote');
    }
  });

  globalShortcut.register('CommandOrControl+Shift+V', () => {
    log.info('Global shortcut: sync clipboard from remote');
    const win = electronState.getMainWindow();
    if (win) {
      win.webContents.send('remote-clipboard-sync-from-remote');
    }
  });

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

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