/**
 * 崩溃/异常终止时通过 Gateway API 发送邮件通知用户。
 *
 * 约束同 pi-mail-bridge/lib/crash-notify.mjs：
 * - 不依赖外部库，只用 Node 内置 http
 * - 所有错误静默
 * - 只在崩溃路径调用
 */

const http = require('http');

const GATEWAY_URL = process.env.AGENTMAIL_GATEWAY_URL || 'http://127.0.0.1:8180';
const AGENT_NAME = process.env.AGENTMAIL_AGENT_NAME || 'opencode';
const AGENT_KEY = process.env.AGENTMAIL_AGENT_KEY || '';

function notifyCrash(reason, err) {
  if (!AGENT_KEY) return;

  const body = JSON.stringify({
    to: 'jianf@',
    subject: `[${AGENT_NAME}] 桥进程异常终止`,
    body: [
      `**${AGENT_NAME}** 桥进程遇到未处理异常，已终止。`,
      '',
      `**原因**：${reason}`,
      err ? `**错误信息**：${err.message || String(err)}` : '',
      err?.stack ? `\n**堆栈**（首 500 字）：\n\`\`\`\n${err.stack.slice(0, 500)}\n\`\`\`` : '',
      '',
      `**自动重启**：systemd 将在 10 秒内自动拉起。`,
      `如果反复崩溃，请检查日志：`,
      `- \`journalctl -u ${AGENT_NAME}-serve -n 50 --no-pager\``,
    ].filter(Boolean).join('\n'),
  });

  const parsed = new URL(`${GATEWAY_URL}/api/v1/agent/send`);
  const req = http.request({
    hostname: parsed.hostname,
    port: parsed.port || 80,
    path: parsed.pathname,
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'X-API-Key': AGENT_KEY,
      'Content-Length': Buffer.byteLength(body),
    },
    timeout: 5000,
  }, () => {});

  req.on('error', () => {});
  req.on('timeout', () => { req.destroy(); });
  req.write(body);
  req.end();
}

module.exports = { notifyCrash };