#!/usr/bin/env node
// Gmail Pub/Sub Pull Daemon
// Polls the Pub/Sub subscription for new Gmail notifications
// and triggers a Clawdbot cron wake when new email arrives.

import { PubSub } from '@google-cloud/pubsub';
import { readFileSync, writeFileSync, existsSync } from 'fs';
import { fileURLToPath } from 'url';
import { dirname, join } from 'path';

const __dirname = dirname(fileURLToPath(import.meta.url));
const PROJECT_ID = 'key-utility-477818-t4';
const SUBSCRIPTION_NAME = 'upwork-email-sub';
const WAKE_URL = 'http://localhost:18700'; // Clawdbot gateway
const CRON_JOB_ID = '2205ac65'; // Upwork email pipeline cron
const SA_KEY_PATH = join(__dirname, 'sa-key.json');

// Debounce: don't wake more than once per 30 seconds
let lastWakeTime = 0;
const DEBOUNCE_MS = 30_000;

const STATE_FILE = '/Users/jakeshore/.clawdbot/workspace/upwork-email-trigger/daemon-state.json';

function loadState() {
  if (existsSync(STATE_FILE)) {
    return JSON.parse(readFileSync(STATE_FILE, 'utf8'));
  }
  return { lastHistoryId: null, totalWakes: 0, startedAt: new Date().toISOString() };
}

function saveState(state) {
  writeFileSync(STATE_FILE, JSON.stringify(state, null, 2));
}

async function triggerCronWake() {
  const now = Date.now();
  if (now - lastWakeTime < DEBOUNCE_MS) {
    console.log(`[${ts()}] Debounced — last wake was ${Math.round((now - lastWakeTime) / 1000)}s ago`);
    return;
  }
  lastWakeTime = now;
  
  try {
    // Use gateway hooks/wake endpoint — triggers the cron job immediately
    const http = await import('http');
    const payload = JSON.stringify({
      text: 'New Upwork email received — run email pipeline now',
      jobId: '2205ac65-cda1-45ca-a041-0849b352a177'
    });
    const result = await new Promise((resolve, reject) => {
      const req = http.request({
        hostname: '127.0.0.1',
        port: 18789,
        path: '/hooks/wake',
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Content-Length': Buffer.byteLength(payload),
          'Authorization': 'Bearer qnLSLAojTmhgdA4vktyaDsoDyvL9yUT_fPVR32vSdxk'
        },
        timeout: 8000,
      }, (res) => {
        let data = '';
        res.on('data', (chunk) => data += chunk);
        res.on('end', () => resolve({ status: res.statusCode, data }));
      });
      req.on('error', reject);
      req.on('timeout', () => { req.destroy(); reject(new Error('HTTP timeout')); });
      req.write(payload);
      req.end();
    });
    if (result.status >= 200 && result.status < 300) {
      console.log(`[${ts()}] Cron wake triggered via hooks/wake! Status: ${result.status}, Response: ${result.data}`);
    } else {
      throw new Error(`HTTP ${result.status}: ${result.data}`);
    }
  } catch (err) {
    // HTTP didn't work either — log notification for the 5-min cron to pick up
    console.log(`[${ts()}] Push wake failed (${err.message}) — 5-min cron polling will catch it`);
    try {
      // Write marker so we can track missed pushes
      writeFileSync('/tmp/upwork-gmail-wake', JSON.stringify({
        timestamp: new Date().toISOString(),
        historyId: 'unknown',
        reason: 'gmail-pubsub-notification',
        note: 'Push trigger failed, relying on 5-min cron polling'
      }));
    } catch (_) {}
  }
}

function ts() {
  return new Date().toLocaleString('en-US', { timeZone: 'America/New_York', hour12: false });
}

async function main() {
  console.log(`[${ts()}] Starting Gmail Pub/Sub pull daemon...`);
  console.log(`[${ts()}] Project: ${PROJECT_ID}, Subscription: ${SUBSCRIPTION_NAME}`);
  
  const state = loadState();
  console.log(`[${ts()}] Last history ID: ${state.lastHistoryId}, Total wakes: ${state.totalWakes}`);
  
  const pubsub = new PubSub({ projectId: PROJECT_ID, keyFilename: SA_KEY_PATH });
  const subscription = pubsub.subscription(SUBSCRIPTION_NAME);
  
  // Use streaming pull (long-lived connection)
  subscription.on('message', async (message) => {
    const data = JSON.parse(Buffer.from(message.data, 'base64').toString());
    console.log(`[${ts()}] Gmail notification: emailAddress=${data.emailAddress}, historyId=${data.historyId}`);
    
    // Only process if for localbosses
    if (data.emailAddress === 'jake@localbosses.org') {
      state.lastHistoryId = data.historyId;
      state.totalWakes++;
      state.lastNotification = new Date().toISOString();
      saveState(state);
      
      await triggerCronWake();
    }
    
    message.ack();
  });
  
  subscription.on('error', (err) => {
    console.error(`[${ts()}] Subscription error: ${err.message}`);
    // Auto-reconnect after 5s
    setTimeout(() => {
      console.log(`[${ts()}] Reconnecting...`);
    }, 5000);
  });
  
  console.log(`[${ts()}] Listening for Gmail notifications...`);
  
  // Keep alive + periodic health check
  setInterval(() => {
    console.log(`[${ts()}] Health check — daemon alive, ${state.totalWakes} total wakes`);
  }, 300_000); // Every 5 minutes
}

main().catch((err) => {
  console.error('Fatal:', err);
  process.exit(1);
});