// main.cjs —— 光湖桥聊天 · Electron 壳
// 集成方式：spawn 光湖桥节点子进程（stdio JSON 模式），IPC 转发事件
const { app, BrowserWindow, ipcMain } = require('electron');
const { spawn } = require('child_process');
const path = require('path');
const fs = require('fs');

// ── 配置：节点号 / 会合点 / node 可执行路径 ──
const cfgPath = path.join(__dirname, 'config.json');
let cfg = {};
try { cfg = JSON.parse(fs.readFileSync(cfgPath, 'utf8')); } catch { /* 用默认值 */ }

const NODE_ID = process.env.GHB_NODE_ID || cfg.nodeId || 'GHB-ELECTRON';
const RELAY = process.env.GHB_RELAY || cfg.relay || '127.0.0.1:9701';
const NODE_BIN = process.env.GHB_NODE_BIN || cfg.nodeBin || 'node';
// 打包态下 bridge 脚本被 unpack 到 app.asar.unpacked（外部 node 读不了 asar 内文件）
const BRIDGE_MJS = [
  path.join(__dirname, '..', 'app.asar.unpacked', 'bridge', 'bridge-node.mjs'),
  path.join(__dirname, 'bridge', 'bridge-node.mjs'),
].find((p) => fs.existsSync(p));

let win = null;
let bridge = null;
let winReady = false;
const evQueue = []; // 窗口就绪前到达的事件先缓存，就绪后补发

function forward(ev) {
  if (!winReady || !win || win.isDestroyed()) { evQueue.push(ev); return; }
  win.webContents.send('ghb:event', ev);
}

function startBridge() {
  const dataDir = path.join(app.getPath('userData'), 'bridge-node');
  const args = [BRIDGE_MJS, 'node', '--stdio', '--id', NODE_ID, '--relay', RELAY, '--state-dir', dataDir];
  bridge = spawn(NODE_BIN, args, { stdio: ['pipe', 'pipe', 'pipe'] });

  let buf = '';
  bridge.stdout.on('data', (chunk) => {
    buf += chunk.toString('utf8');
    let i;
    while ((i = buf.indexOf('\n')) >= 0) {
      const line = buf.slice(0, i).trim();
      buf = buf.slice(i + 1);
      if (!line) continue;
      try {
        const ev = JSON.parse(line);
        forward(ev);
      } catch { /* 非 JSON 行忽略 */ }
    }
  });
  bridge.stderr.on('data', (d) => console.error(`[bridge] ${d.toString().trim()}`));
  bridge.on('exit', (code) => {
    console.error(`[bridge] 子进程退出 code=${code}`);
    if (win && !win.isDestroyed()) win.webContents.send('ghb:event', { event: 'error', message: `桥接进程退出（${code}）` });
  });
}

function createWindow() {
  win = new BrowserWindow({
    width: 920,
    height: 660,
    title: `光湖桥 · 聊天 · ${NODE_ID}`,
    backgroundColor: '#0b1220',
    webPreferences: {
      preload: path.join(__dirname, 'preload.cjs'),
      contextIsolation: true,
      nodeIntegration: false,
    },
  });
  win.loadFile(path.join(__dirname, 'chat.html'));
  win.webContents.once('did-finish-load', () => {
    winReady = true;
    for (const ev of evQueue.splice(0)) win.webContents.send('ghb:event', ev); // 补发早到事件
  });
}

app.whenReady().then(() => {
  startBridge();
  createWindow();
  // 自检钩子：GHB_AUTOSEND="对端|文本|延迟秒" 自动发一条；GHB_SHOT=/path.png 延迟截屏取证
  const auto = process.env.GHB_AUTOSEND;
  if (auto) {
    const [to, text, delay] = auto.split('|');
    setTimeout(() => {
      // 走渲染进程的 UI 发送路径，让气泡/状态行真实渲染出来
      if (win && !win.isDestroyed()) {
        win.webContents.send('ghb:event', { event: '__autosend', to, text });
        console.log(`[autotest] 已触发 UI 自动发送 → ${to}`);
      }
    }, (Number(delay) || 3) * 1000);
  }
  const shot = process.env.GHB_SHOT;
  if (shot) {
    setTimeout(async () => {
      try {
        const img = await win.capturePage();
        fs.writeFileSync(shot, img.toPNG());
        console.log(`[autotest] 截屏已存 ${shot}`);
      } catch (e) { console.error(`[autotest] 截屏失败：${e.message}`); }
    }, (Number(process.env.GHB_SHOT_DELAY) || 8) * 1000);
  }
  app.on('activate', () => {
    if (BrowserWindow.getAllWindows().length === 0) createWindow();
  });
});

ipcMain.on('ghb:send', (_e, to, text) => {
  if (bridge && bridge.stdin.writable) {
    bridge.stdin.write(JSON.stringify({ cmd: 'send', to, text }) + '\n');
  }
});

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

app.on('quit', () => { if (bridge) bridge.kill('SIGTERM'); });