const { app, BrowserWindow, ipcMain, dialog, globalShortcut } = require('electron');
const path = require('path');
const fs = require('fs');
const isDev = process.env.NODE_ENV === 'development';

// 存储所有窗口的引用
const windows = new Set();
let pendingFilePath = null;

// 设置应用程序图标
if (process.platform === 'win32') {
  app.setAppUserModelId("com.mdnote.app");
}

// 处理文件打开
function handleFileOpen(filePath, targetWindow = null) {
  if (!filePath) {
    console.log('No file path provided');
    return;
  }
  
  console.log('Handling file open:', filePath);
  try {
    // 确保文件路径是绝对路径
    const absolutePath = path.resolve(filePath);
    console.log('Absolute file path:', absolutePath);
    
    // 检查文件是否存在
    if (!fs.existsSync(absolutePath)) {
      console.error('File does not exist:', absolutePath);
      return;
    }
    
    const content = fs.readFileSync(absolutePath, 'utf-8');
    console.log('File content read successfully');
    
    let win = targetWindow;
    if (!win) {
      console.log('No window specified, creating new window');
      win = createWindow(absolutePath);
      return;
    }

    // 等待窗口加载完成后发送内容
    const sendContent = () => {
      if (!win) return;
      console.log('Sending content to window');
      win.webContents.send('file-opened', {
        content: content,
        path: absolutePath
      });
    };

    if (win.webContents.isLoading()) {
      win.webContents.once('did-finish-load', () => {
        setTimeout(sendContent, 100);
      });
    } else {
      sendContent();
    }

    if (win.isMinimized()) {
      win.restore();
    }
    win.focus();
  } catch (error) {
    console.error('Error reading file:', error);
    dialog.showErrorBox('打开文件失败', `无法打开文件: ${error.message}`);
  }
}

function createWindow(initialFilePath = null) {
  const iconPath = isDev 
    ? path.join(__dirname, './build/icons/icon.ico')
    : path.join(process.resourcesPath, 'icon.ico');

  // 提前读取文件内容
  let initialContent = null;
  if (initialFilePath) {
    try {
      initialContent = fs.readFileSync(initialFilePath, 'utf-8');
    } catch (error) {
      console.error('Error reading initial file:', error);
      dialog.showErrorBox('打开文件失败', `无法打开文件: ${error.message}`);
      return null;
    }
  }

  const newWindow = new BrowserWindow({
    width: 1200,
    height: 800,
    autoHideMenuBar: true,
    icon: iconPath,
    webPreferences: {
      nodeIntegration: false,
      contextIsolation: true,
      webSecurity: true,
      allowRunningInsecureContent: false,
      preload: path.join(__dirname, 'preload.js')
    },
    show: false // 先不显示窗口
  });

  // 设置任务栏图标
  if (process.platform === 'win32') {
    newWindow.setThumbarButtons([]);
  }

  // 设置 CSP
  newWindow.webContents.session.webRequest.onHeadersReceived((details, callback) => {
    callback({
      responseHeaders: {
        ...details.responseHeaders,
        'Content-Security-Policy': [
          "default-src 'self' 'unsafe-inline' 'unsafe-eval' data: blob: https:;",
          "script-src 'self' 'unsafe-inline' 'unsafe-eval' blob: https:;",
          "script-src-elem 'self' 'unsafe-inline' 'unsafe-eval' blob: https:;",
          "style-src 'self' 'unsafe-inline' blob: https:;",
          "style-src-elem 'self' 'unsafe-inline' blob: https:;",
          "img-src 'self' data: blob: https:;",
          "font-src 'self' data: https:;",
          "connect-src 'self' ws: wss: https:;"
        ].join(' ')
      }
    });
  });

  // 设置 webSecurity 为 false（仅在开发环境）
  if (isDev) {
    newWindow.webContents.session.webRequest.onHeadersReceived((details, callback) => {
      callback({
        responseHeaders: {
          ...details.responseHeaders,
          'Access-Control-Allow-Origin': ['*']
        }
      });
    });
  }

  // 注册打开 DevTools 的快捷键
  globalShortcut.register('CommandOrControl+Shift+I', () => {
    if (newWindow) {
      newWindow.webContents.toggleDevTools();
    }
  });

  // 添加右键菜单
  newWindow.webContents.on('context-menu', (event, params) => {
    newWindow.webContents.toggleDevTools();
  });

  // 监听窗口加载完成事件
  newWindow.webContents.on('did-finish-load', () => {
    console.log('Window loaded');
    if (pendingFilePath) {
      console.log('Processing pending file:', pendingFilePath);
      const filePath = pendingFilePath;
      pendingFilePath = null;
      // 延迟一下再发送文件内容，确保渲染进程已完全准备好
      setTimeout(() => {
        handleFileOpen(filePath, newWindow);
      }, 100);
    }
  });

  // 监听 DOM 准备就绪事件
  newWindow.webContents.on('dom-ready', () => {
    console.log('DOM is ready');
  });

  // 当窗口准备好时再显示
  newWindow.once('ready-to-show', () => {
    newWindow.show();
  });

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

  // 当窗口加载完成时，如果有初始文件内容，则立即发送
  if (initialContent !== null) {
    newWindow.webContents.once('did-finish-load', () => {
      newWindow.webContents.send('file-opened', {
        content: initialContent,
        path: initialFilePath
      });
    });
  }

  // 当窗口关闭时从集合中移除
  newWindow.on('closed', () => {
    windows.delete(newWindow);
  });

  // 将窗口添加到集合中
  windows.add(newWindow);

  return newWindow;
}

// 处理命令行参数
function handleCommandLineArgs() {
  const args = process.argv.slice(1);
  console.log('Command line args:', args);
  const mdFile = args.find(arg => {
    // 检查参数是否以 .md 结尾，并且不是命令行选项
    return arg.toLowerCase().endsWith('.md') && !arg.startsWith('--');
  });
  
  if (mdFile) {
    console.log('Found MD file in args:', mdFile);
    return path.resolve(mdFile);
  }
  console.log('No MD file found in args');
  return null;
}

// 处理 Windows 文件关联打开
if (process.platform === 'win32') {
  // 移除单实例锁，允许多实例运行
  const gotTheLock = true;
  
  app.on('second-instance', (event, commandLine, workingDirectory) => {
    console.log('Second instance detected');
    console.log('Command line:', commandLine);
    
    // 为新实例创建新窗口
    const filePath = commandLine.find(arg => arg.toLowerCase().endsWith('.md'));
    if (filePath) {
      createWindow(filePath);
    } else {
      createWindow();
    }
  });

  // 设置为默认的 .md 文件处理程序
  app.setAsDefaultProtocolClient('mdnote');
}

// 应用程序就绪事件
app.whenReady().then(() => {
  console.log('App is ready');
  
  // 处理启动参数
  const filePath = handleCommandLineArgs();
  if (filePath) {
    console.log('Initial file path:', filePath);
    createWindow(filePath);
  } else {
    createWindow();
  }
  
  app.on('activate', () => {
    if (windows.size === 0) {
      createWindow();
    }
  });
});

// 处理文件保存
ipcMain.on('save-file', (event, { content, path: filePath }) => {
  console.log('Save file request received');
  console.log('Content length to save:', content.length);
  console.log('Content preview:', content.substring(0, 100));
  
  try {
    const targetPath = filePath || pendingFilePath;
    
    if (!targetPath) {
      console.error('No file path for saving');
      event.reply('save-file-reply', { 
        success: false, 
        error: 'No file path specified' 
      });
      return;
    }

    // 确保文件路径是绝对路径
    const absolutePath = path.resolve(targetPath);
    console.log('Absolute save path:', absolutePath);

    // 检查文件是否可写
    try {
      fs.accessSync(absolutePath, fs.constants.W_OK);
    } catch (error) {
      console.error('File is not writable:', error);
      event.reply('save-file-reply', { 
        success: false, 
        error: `File is not writable: ${error.message}` 
      });
      return;
    }

    // 写入文件
    fs.writeFileSync(absolutePath, content, 'utf-8');
    console.log('File saved successfully');

    // 更新当前文件路径
    pendingFilePath = absolutePath;

    // 验证文件是否正确保存
    const savedContent = fs.readFileSync(absolutePath, 'utf-8');
    if (savedContent === content) {
      console.log('File content verified');
      event.reply('save-file-reply', { 
        success: true,
        path: absolutePath
      });
    } else {
      console.error('File content verification failed');
      event.reply('save-file-reply', { 
        success: false, 
        error: 'File content verification failed' 
      });
    }
  } catch (error) {
    console.error('Error saving file:', error);
    event.reply('save-file-reply', { 
      success: false, 
      error: error.message 
    });
  }
});

// 处理另存为
ipcMain.on('save-file-as', (event, { content, defaultPath }) => {
  console.log('Save file as request received');
  dialog.showSaveDialog({
    defaultPath: defaultPath || path.join(app.getPath('documents'), 'untitled.md'),
    filters: [{ name: 'Markdown', extensions: ['md'] }]
  }).then(result => {
    if (!result.canceled && result.filePath) {
      try {
        fs.writeFileSync(result.filePath, content, 'utf-8');
        pendingFilePath = result.filePath;
        console.log('File saved successfully to:', result.filePath);
        event.reply('save-file-reply', { 
          success: true, 
          path: result.filePath 
        });
      } catch (error) {
        console.error('Error saving file:', error);
        event.reply('save-file-reply', { 
          success: false, 
          error: error.message 
        });
      }
    }
  }).catch(error => {
    console.error('Error in save dialog:', error);
    event.reply('save-file-reply', { 
      success: false, 
      error: error.message 
    });
  });
});

// 处理所有窗口关闭事件
app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') {
    app.quit();
  }
});

// 应用退出时清理
app.on('will-quit', () => {
  globalShortcut.unregisterAll();
});