// Minimal detection service: receives satellite/infra events, writes to Postgres and emits to Redis
const express = require('express');
const bodyParser = require('body-parser');
const { Pool } = require('pg');
const Redis = require('ioredis');
const { v4: uuidv4 } = require('uuid');

const pool = new Pool({ connectionString: process.env.DATABASE_URL || 'postgresql://localhost/integral' });
const redis = new Redis(process.env.REDIS_URL || 'redis://localhost:6379');

const app = express();
app.use(bodyParser.json());

/**
 Expected payload: {
   namespace: "satellite" | "infrastructure",
   type: "pothole-detection",
   timestamp: "2025-11-30T10:00:00Z",
   location: { lat: -29.12, lon: 26.22 },
   severity: 3,
   images: ["https://..."],
   provenance: {...}
 }
**/
app.post('/detect', async (req, res) => {
  try {
    const { namespace, type, timestamp, location, severity=1, images=[], provenance={} } = req.body;
    const id = uuidv4();
    const q = `INSERT INTO objects (id, namespace, type, timestamp, location, severity, images, provenance)
               VALUES ($1,$2,$3,$4,$5,$6,$7,$8) RETURNING *`;
    const values = [id, namespace, type, timestamp || new Date().toISOString(), location || null, severity, JSON.stringify(images), provenance];
    const result = await pool.query(q, values);
    const obj = result.rows[0];

    // publish event for verification
    await redis.publish('infra:faults:created', JSON.stringify({ id: obj.id, namespace, type, location, severity }));

    res.status(201).json(obj);
  } catch (err) {
    console.error(err);
    res.status(500).json({ error: 'detection failed' });
  }
});

app.listen(process.env.PORT || 3001, () => console.log('detection-service listening on 3001'));