// main.js  (ESM 版本)
import { app, BrowserWindow, Menu, ipcMain, shell, dialog } from 'electron';
import { fileURLToPath } from 'url';
import { dirname, join } from 'path';
import { exec } from 'child_process';
import { promisify } from 'util';
import { writeLog } from './src/log/log-writer.js';
import { tmpdir } from 'os';
import { writeFileSync } from 'fs';

// -------------- 构造 ESM 版 __dirname --------------
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);
const execAsync = promisify(exec);

let win=null;

// -------------- 单实例检查 ------------
// 1. 请求单实例锁
const gotTheLock = app.requestSingleInstanceLock();
if (!gotTheLock) {
  // 抢锁失败 -> 立即退出
  app.quit();
}

// 2. 抢锁成功 -> 监听后续启动事件
app.on('second-instance', (ev, cmd, cwd, additionalData) => {
  // 把已存在的窗口提到最前
  if (win) {
    if (win.isMinimized()) win.restore();
    win.focus();
  }
  // todo 也可以在这里解析 cmd 中的参数，做打开文件等操作
});
// -------------- 创建窗口 --------------
function createWindow() {
  const isMac = process.platform === 'darwin';

  win = new BrowserWindow({
    show: false,
    frame: false,
    titleBarStyle: 'hidden',
    webPreferences: {
      nodeIntegration: false,
      contextIsolation: true,
      preload: join(__dirname, 'preload.js'),
    },
  });

  // 去掉应用菜单栏
  Menu.setApplicationMenu(null);
  if (!isMac) win.removeMenu();

  win.maximize();

  // 加载外置 H5 页面
  win.loadFile(join(process.cwd(), 'h5/index.html'));

  win.once('ready-to-show', () => win.show());
  //渲染进程死了，纪录日志
  win.webContents.on('render-process-gone', (event, details) => {
    writeLog('error',`渲染进程崩溃 ${details}`);
    // writeLog('error', JSON.stringify(details));
  });
}

// -------------- 应用生命周期 --------------
app.whenReady().then(createWindow);

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

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

// -------------- 系统操作函数 --------------
const getSystemCommands = () => {
  const platform = process.platform;
  
  switch (platform) {
    case 'win32': // Windows
      return {
        shutdown: 'shutdown /s /t 0'
      };
    case 'darwin': // macOS
      return {
        shutdown: 'sudo shutdown -h now'
      };
    case 'linux': // Linux
      return {
        shutdown: 'systemctl poweroff'
      };
    default:
      return {
        shutdown: null
      };
  }
};

const executeSystemCommand = async (command, requiresAdmin = false) => {
  try {
    if (!command) {
      throw new Error('当前平台不支持该操作');
    }
    
    // Windows平台的权限检查
    if (process.platform === 'win32' && requiresAdmin) {
      // 检查是否以管理员身份运行
      try {
        await execAsync('net session', { timeout: 5000 });
      } catch (adminCheckError) {
        writeLog('warn', '操作可能需要管理员权限');
        return { 
          success: false, 
          error: '该操作需要管理员权限，请以管理员身份运行程序后重试',
          requiresAdmin: true
        };
      }
    }
    
    const { stdout, stderr } = await execAsync(command, { timeout: 10000 });
    writeLog('info', `系统命令执行成功: ${command}`);
    
    if (stderr && stderr.trim()) {
      writeLog('warn', `系统命令有警告信息: ${stderr}`);
    }
    
    return { success: true, stdout, stderr };
  } catch (error) {
    let errorMessage = error.message;
    
    // 特定错误类型的处理
    if (error.code === 'EACCES') {
      errorMessage = '权限不足，请以管理员身份运行程序';
    } else if (error.code === 'ENOENT') {
      errorMessage = '系统命令不存在或路径错误';
    } else if (error.code === 'ETIMEDOUT') {
      errorMessage = '操作超时，请重试';
    }
    
    writeLog('error', `系统命令执行失败: ${command}, 错误: ${errorMessage}`);
    return { success: false, error: errorMessage };
  }
};

// -------------- IPC --------------
ipcMain.handle('write-log', async (_, level, msg) => {
  writeLog(level, msg);
});

// 退出应用
ipcMain.handle('exit-close', async () => {
  writeLog('info', '用户选择关闭应用程序');
  app.quit();
  return { success: true };
});

// 关机
ipcMain.handle('exit-shutdown', async () => {
  writeLog('info', '用户选择关机');
  const commands = getSystemCommands();
  // 关机通常需要管理员权限
  const requiresAdmin = true;
  return await executeSystemCommand(commands.shutdown, requiresAdmin);
});

// ========== 打印相关 IPC 处理器 ==========

/**
 * 打印HTML内容
 */
// 工具：一次性事件监听
const once = (emitter, name) =>
  new Promise(resolve => emitter.once(name, resolve));

// 工具：生成不二次编码的 data URL
const makeDataURL = html =>
  `data:text/html;charset=utf-8,${Buffer.from(html, 'utf-8')}`;

ipcMain.handle('print-film', async (event, options) => {
  let printWindow = null;
  try {
    writeLog('info', `开始打印，选项: ${JSON.stringify(options)}`);

    const { html, orientation, paperSize, silent, margins } = options;

    // 1. 创建隐藏窗口
    printWindow = new BrowserWindow({
      show: true,               // true 仅调试时打开
      webPreferences: {
        nodeIntegration: false,
        contextIsolation: false,
        //sandbox: true
      }
    });

    // 2. 加载 HTML
    const loaded = once(printWindow.webContents, 'did-finish-load');
    await printWindow.loadURL(makeDataURL(html));
    await loaded;

    // 3. 打印参数
    const printOpts = {
      silent: Boolean(silent),
      printBackground: true,
      color: true,
      margins: {
        marginType: 'custom',
        top: margins?.top ?? 10,
        bottom: margins?.bottom ?? 10,
        left: margins?.left ?? 10,
        right: margins?.right ?? 10
      },
      landscape: orientation === 'landscape',
      pageSize: paperSize || 'A4'
    };

    // 4. 执行打印（带 60 秒超时）
    const [success, reason] = await Promise.race([
      new Promise(res => {
        printWindow.webContents.print(printOpts, (ok, err) => res([ok, err]));
      }),
      new Promise((_, rej) =>
        setTimeout(() => rej(new Error('打印超时（60s）')), 60_000)
      )
    ]);

    // 5. 清理窗口
    if (printWindow && !printWindow.isDestroyed()) {
      printWindow.close();
      printWindow = null;
    }

    if (success) {
      writeLog('info', '打印成功');
      return { success: true };
    }
    throw new Error(reason || '打印失败');
  } catch (err) {
    writeLog('error', `打印出错: ${err.message}`);
    // 确保异常时窗口也关掉
    if (printWindow && !printWindow.isDestroyed()) {
      printWindow.close();
    }
    return { success: false, error: err.message };
  }
});

/**
 * 打印HTML内容到文件（使用File System API）
 */
ipcMain.handle('print-film-to-file', async (event, options) => {
  let printWindow = null;
  const tempFiles = [];

  try {
    writeLog('info', `开始文件系统打印，选项: ${JSON.stringify(options)}`);

    const { html, imageDataList, orientation, paperSize, silent, margins } = options;

    // 1. 创建临时图片文件
    const fs = await import('fs/promises');
    const os = await import('os');
    const path = await import('path');
    const { fileURLToPath, pathToFileURL } = await import('url');

    const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'electron-print-'));

    // 当前时间戳用于文件名
    const timestamp = Date.now();

    // 处理每个图片数据
    const imageUrlMap = new Map();

    for (let i = 0; i < imageDataList.length; i++) {
      const { canvasId, data: base64Data } = imageDataList[i];

      // 将base64转换为buffer
      const buffer = Buffer.from(base64Data, 'base64');

      // 生成临时文件路径
      const tempFilePath = path.join(tempDir, `print-image-${timestamp}-${i}.png`);

      // 写入文件
      await fs.writeFile(tempFilePath, buffer);
      tempFiles.push(tempFilePath);
      writeLog('info', `临时图片文件已保存: ${tempFilePath}`);

      // 使用Node.js内置方法构造file:// URL
      const fileUrl = pathToFileURL(tempFilePath).href;
      writeLog('info', `File URL构造: ${fileUrl}`);
      writeLog('info', `原始路径: ${tempFilePath}`);

      // 记录文件路径映射
      imageUrlMap.set(canvasId, fileUrl);
    }

    // 2. 生成最终HTML，将占位符替换为文件URL
    let finalHtml = html;
    for (const [canvasId, fileUrl] of imageUrlMap.entries()) {
      finalHtml = finalHtml.replace(
        new RegExp(`<img id="${canvasId}"[^>]*>`, 'g'),
        `<img id="${canvasId}" src="${fileUrl}" style="max-width: 100%;" alt="打印图片" />`
      );
    }

    writeLog('info', `HTML占位符已替换完成，临时文件数量: ${tempFiles.length}`);

    // 3. 包装完整的HTML文档
    const fullHtml = `
<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>打印胶片</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      width: 100%;
      height: 100%;
      background: white;
    }

    @page {
      size: ${paperSize} ${orientation};
      margin: ${margins?.top ?? 10}mm ${margins?.right ?? 10}mm ${margins?.bottom ?? 10}mm ${margins?.left ?? 10}mm;
    }

    .print-only {
      display: block !important;
    }

    .screen-only {
      display: none !important;
    }
  </style>
</head>
<body>
235689
  <div id="film-print-area">
    ${finalHtml}
  </div>
</body>
</html>
    `;

    // 4. 创建隐藏窗口（调试时可以设为true查看窗口内容）
    printWindow = new BrowserWindow({
      show: true, // 设为true调试内容
      webPreferences: {
        nodeIntegration: false,
        contextIsolation: false,
      }
    });

    writeLog('info', '打印窗口已创建，开始加载HTML');
    writeLog('info',`把完整的html文件保存起来：${fullHtml}`)

    // 5. 加载 HTML
    const loaded = once(printWindow.webContents, 'did-finish-load');
    // const htmlDataURL = makeDataURL(fullHtml);
    // await printWindow.loadURL(htmlDataURL);
    // 1. 把完整 HTML 写入临时文件
const tmpHtml = join(tmpdir(), `electron-print-${Date.now()}.html`);
await writeFileSync(tmpHtml, fullHtml, 'utf8');

// 2. 用 file:// 协议加载
await printWindow.loadURL(`file://${tmpHtml.replace(/\\/g, '/')}`);

    await loaded;

    writeLog('info', 'HTML加载完成，等待图片加载...');

    // 6. 等待所有图片加载完成（重要的是这个步骤）
    await new Promise((resolve, reject) => {
      let loadedCount = 0;
      const totalImages = imageDataList.length;

      if (totalImages === 0) {
        // 没有图片，直接继续
        resolve();
        return;
      }

      const checkLoaded = () => {
        loadedCount++;
        writeLog('info', `图片已加载 ${loadedCount}/${totalImages}`);

        if (loadedCount >= totalImages) {
          writeLog('info', '所有图片加载完成');
          resolve();
        }
      };

      printWindow.webContents.on('console-message', (event, level, message) => {
        // 监控图片加载的调试信息
        if (message.includes('图片加载完成')) {
          checkLoaded();
        }
      });

      // 设置超时（20秒）
      setTimeout(() => {
        writeLog('warn', `图片加载超时 (已加载 ${loadedCount}/${totalImages})，仍继续打印`);
        resolve();
      }, 10000);
    });

    // 7. 执行打印
    const printOpts = {
      silent: false,//Boolean(silent),
      printBackground: true,
      color: true,
      margins: {
        marginType: 'custom',
        top: margins?.top ?? 10,
        bottom: margins?.bottom ?? 10,
        left: margins?.left ?? 10,
        right: margins?.right ?? 10
      },
      landscape: orientation === 'landscape',
      pageSize: paperSize || 'A4'
    };

    writeLog('info', '开始执行打印');
    const [success, reason] = await Promise.race([
      new Promise( res => {
        // 使用 printDialog 显示对话框
        // printWindow.webContents.printDialog(printOpts);
        printWindow.webContents.print(printOpts, (ok, err) => res([ok, err]));
      }),
      new Promise((_, rej) =>
        setTimeout(() => rej(new Error('打印超时（60s）')), 60_000)
      )
    ]);

    // 8. 清理临时文件
    // try {
    //   for (const tempFile of tempFiles) {
    //     await fs.unlink(tempFile);
    //     writeLog('info', `临时文件已删除: ${tempFile}`);
    //   }
    //   // 删除临时目录
    //   await fs.rmdir(tempDir, { recursive: true });
    //   writeLog('info', `临时目录已删除: ${tempDir}`);
    // } catch (cleanupError) {
    //   writeLog('warn', `清理临时文件失败: ${cleanupError.message}`);
    // }

    if (success) {
      writeLog('info', '文件系统打印成功');
      return { success: true };
    }
    throw new Error(reason || '打印失败');

  } catch (err) {
    writeLog('error', `文件系统打印出错: ${err.message}`);

    // 清理资源
    if (printWindow && !printWindow.isDestroyed()) {
      printWindow.close();
    }

    // // 清理临时文件
    // try {
    //   const fs = await import('fs/promises');
    //   for (const tempFile of tempFiles) {
    //     try {
    //       await fs.unlink(tempFile);
    //     } catch (e) {
    //       // 忽略单个文件删除错误
    //     }
    //   }
    // } catch (cleanupError) {
    //   writeLog('warn', `清理临时文件失败: ${cleanupError.message}`);
    // }

    return { success: false, error: err.message };
  }
});

/**
 * 导出为PDF
 */
ipcMain.handle('print-to-pdf', async (event, options) => {
  try {
    writeLog('info', `开始导出PDF，选项: ${JSON.stringify(options)}`);

    const { html, orientation, paperSize, margins } = options;

    // 创建隐藏窗口
    const pdfWindow = new BrowserWindow({
      show: false,
      webPreferences: {
        nodeIntegration: false,
        contextIsolation: true,
      },
    });

    // 加载HTML内容
    await pdfWindow.loadURL(`data:text/html;charset=utf-8,${encodeURIComponent(html)}`);

    // 等待加载完成
    await new Promise(resolve => {
      pdfWindow.webContents.on('did-finish-load', resolve);
    });

    // PDF选项
    const pdfOptions = {
      printBackground: true,
      landscape: orientation === 'landscape',
      pageSize: paperSize || 'A4',
      margins: {
        top: margins?.top || 10,
        bottom: margins?.bottom || 10,
        left: margins?.left || 10,
        right: margins?.right || 10,
      },
    };

    // 生成PDF
    const data = await pdfWindow.webContents.printToPDF(pdfOptions);

    // 关闭窗口
    pdfWindow.close();

    // 显示保存对话框
    const { filePath } = await dialog.showSaveDialog(win, {
      title: '保存PDF',
      defaultPath: `film-${Date.now()}.pdf`,
      filters: [
        { name: 'PDF文件', extensions: ['pdf'] }
      ]
    });

    if (filePath) {
      const fs = await import('fs/promises');
      await fs.writeFile(filePath, data);
      writeLog('info', `PDF已保存到: ${filePath}`);

      // 询问是否打开文件
      const { response } = await dialog.showMessageBox(win, {
        type: 'info',
        message: 'PDF导出成功',
        detail: `文件已保存到:\n${filePath}`,
        buttons: ['打开文件', '关闭'],
        defaultId: 0
      });

      if (response === 0) {
        shell.openPath(filePath);
      }

      return { success: true, filePath };
    }

    return { success: false, error: '用户取消保存' };

  } catch (error) {
    writeLog('error', `导出PDF出错: ${error.message}`);
    return { success: false, error: error.message };
  }
});