import { app, BrowserWindow, ipcMain, shell, dialog } from 'electron';
import * as path from 'path';
import * as fs from 'fs';
import express from 'express';
import { GrpcClient } from './modules/grpc-client';
import { SecureStorage } from './modules/storage';

// 内置 HTTP 服务器端口
const HTTP_PORT = 3456;

let mainWindow: BrowserWindow | null = null;
let grpcClient: GrpcClient | null = null;
let storage: SecureStorage | null = null;
let httpServer: ReturnType<typeof express.application.listen> | null = null;

// 创建主窗口
function createWindow() {
  mainWindow = new BrowserWindow({
    width: 1200,
    height: 800,
    minWidth: 800,
    minHeight: 600,
    webPreferences: {
      preload: path.join(__dirname, 'preload.js'),
      contextIsolation: true,
      nodeIntegration: false,
    },
    titleBarStyle: 'hiddenInset',
    show: false,
  });

  // 开发模式下加载 Vite 开发服务器
  if (process.env.NODE_ENV === 'development') {
    mainWindow.loadURL('http://localhost:5173');
    mainWindow.webContents.openDevTools();
  } else {
    // 生产模式下加载打包后的文件
    mainWindow.loadFile(path.join(__dirname, '../dist/index.html'));
  }

  mainWindow.once('ready-to-show', () => {
    mainWindow?.show();
  });

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

  // 处理外部链接
  mainWindow.webContents.setWindowOpenHandler(({ url }) => {
    shell.openExternal(url);
    return { action: 'deny' };
  });
}

// 启动内置 HTTP 服务器
function startHttpServer() {
  const expressApp = express();

  expressApp.use(express.json());
  expressApp.use(express.static(path.join(__dirname, '../dist')));

  // API 路由
  expressApp.get('/api/status', (_req, res) => {
    res.json({
      connected: grpcClient?.isConnected() ?? false,
      partyId: grpcClient?.getPartyId() ?? null,
    });
  });

  // 所有其他路由返回 index.html (SPA)
  expressApp.get('*', (_req, res) => {
    res.sendFile(path.join(__dirname, '../dist/index.html'));
  });

  httpServer = expressApp.listen(HTTP_PORT, '127.0.0.1', () => {
    console.log(`HTTP server running at http://127.0.0.1:${HTTP_PORT}`);
  });
}

// 初始化服务
async function initServices() {
  // 初始化 gRPC 客户端
  grpcClient = new GrpcClient();

  // 初始化安全存储
  storage = new SecureStorage();

  // 设置 IPC 处理器
  setupIpcHandlers();
}

// 设置 IPC 通信处理器
function setupIpcHandlers() {
  // gRPC 连接
  ipcMain.handle('grpc:connect', async (_event, { host, port }) => {
    try {
      await grpcClient?.connect(host, port);
      return { success: true };
    } catch (error) {
      return { success: false, error: (error as Error).message };
    }
  });

  // 注册为参与方
  ipcMain.handle('grpc:register', async (_event, { partyId, role }) => {
    try {
      await grpcClient?.registerParty(partyId, role);
      return { success: true };
    } catch (error) {
      return { success: false, error: (error as Error).message };
    }
  });

  // 加入会话
  ipcMain.handle('grpc:joinSession', async (_event, { sessionId, partyId, joinToken }) => {
    try {
      const result = await grpcClient?.joinSession(sessionId, partyId, joinToken);
      return { success: true, data: result };
    } catch (error) {
      return { success: false, error: (error as Error).message };
    }
  });

  // 存储 - 保存 share
  ipcMain.handle('storage:saveShare', async (_event, { share, password }) => {
    try {
      storage?.saveShare(share, password);
      return { success: true };
    } catch (error) {
      return { success: false, error: (error as Error).message };
    }
  });

  // 存储 - 获取 share 列表
  ipcMain.handle('storage:listShares', async () => {
    try {
      const shares = storage?.listShares() ?? [];
      return { success: true, data: shares };
    } catch (error) {
      return { success: false, error: (error as Error).message };
    }
  });

  // 存储 - 导出 share
  ipcMain.handle('storage:exportShare', async (_event, { id, password }) => {
    try {
      const data = storage?.exportShare(id, password);
      return { success: true, data };
    } catch (error) {
      return { success: false, error: (error as Error).message };
    }
  });

  // 存储 - 导入 share (从文件路径)
  ipcMain.handle('storage:importShare', async (_event, { filePath, password }) => {
    try {
      const data = fs.readFileSync(filePath);
      const share = storage?.importShare(data, password);
      return { success: true, share };
    } catch (error) {
      return { success: false, error: (error as Error).message };
    }
  });

  // 存储 - 获取单个 share
  ipcMain.handle('storage:getShare', async (_event, { id, password }) => {
    try {
      const share = storage?.getShare(id, password);
      return share;
    } catch (error) {
      return null;
    }
  });

  // 存储 - 删除 share
  ipcMain.handle('storage:deleteShare', async (_event, { id }) => {
    try {
      storage?.deleteShare(id);
      return { success: true };
    } catch (error) {
      return { success: false, error: (error as Error).message };
    }
  });

  // 存储 - 获取设置
  ipcMain.handle('storage:getSettings', async () => {
    try {
      return storage?.getSettings() ?? null;
    } catch (error) {
      return null;
    }
  });

  // 存储 - 保存设置
  ipcMain.handle('storage:saveSettings', async (_event, { settings }) => {
    try {
      storage?.saveSettings(settings);
      return { success: true };
    } catch (error) {
      return { success: false, error: (error as Error).message };
    }
  });

  // gRPC - 创建会话
  ipcMain.handle('grpc:createSession', async (_event, params) => {
    // TODO: 实现创建会话逻辑
    return { success: false, error: '功能尚未实现 - 需要连接到 Session Coordinator' };
  });

  // gRPC - 验证邀请码
  ipcMain.handle('grpc:validateInviteCode', async (_event, { code }) => {
    // TODO: 实现验证邀请码逻辑
    return { success: false, error: '功能尚未实现 - 需要连接到 Session Coordinator' };
  });

  // gRPC - 获取会话状态
  ipcMain.handle('grpc:getSessionStatus', async (_event, { sessionId }) => {
    // TODO: 实现获取会话状态逻辑
    return { success: false, error: '功能尚未实现' };
  });

  // gRPC - 测试连接
  ipcMain.handle('grpc:testConnection', async (_event, { url }) => {
    try {
      // 地址格式: host:port (例如 mpc-grpc.szaiai.com:443)
      await grpcClient?.connect(url);
      return { success: true };
    } catch (error) {
      return { success: false, error: (error as Error).message };
    }
  });

  // gRPC - 验证签名会话
  ipcMain.handle('grpc:validateSigningSession', async (_event, { code }) => {
    // TODO: 实现验证签名会话逻辑
    return { success: false, error: '功能尚未实现 - 需要连接到 Session Coordinator' };
  });

  // gRPC - 加入签名会话
  ipcMain.handle('grpc:joinSigningSession', async (_event, params) => {
    // TODO: 实现加入签名会话逻辑
    return { success: false, error: '功能尚未实现' };
  });

  // 对话框 - 选择目录
  ipcMain.handle('dialog:selectDirectory', async () => {
    const result = await dialog.showOpenDialog(mainWindow!, {
      properties: ['openDirectory'],
    });
    return result.canceled ? null : result.filePaths[0];
  });

  // 对话框 - 选择文件
  ipcMain.handle('dialog:selectFile', async (_event, { filters }) => {
    const result = await dialog.showOpenDialog(mainWindow!, {
      properties: ['openFile'],
      filters: filters || [],
    });
    return result.canceled ? null : result.filePaths[0];
  });

  // 对话框 - 保存文件
  ipcMain.handle('dialog:saveFile', async (_event, { defaultPath, filters }) => {
    const result = await dialog.showSaveDialog(mainWindow!, {
      defaultPath,
      filters: filters || [],
    });
    return result.canceled ? null : result.filePath;
  });
}

// 应用生命周期
app.whenReady().then(async () => {
  await initServices();
  // HTTP 服务器仅在开发模式下启动
  if (process.env.NODE_ENV === 'development') {
    startHttpServer();
  }
  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', () => {
  // 清理资源
  grpcClient?.disconnect();
  httpServer?.close();
});