server.js

require('dotenv').config();

const express = require('express');
const cors = require('cors');
const path = require('path');
const matcher = require('./src/matcher');
const { checkOllamaHealth } = require('./src/ai');
const analyzeRoutes = require('./src/routes/analyze');

const app = express();
const PORT = process.env.PORT || 3000;

app.use(cors());
app.use(express.json());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/api', analyzeRoutes);

app.get('/api/health', async (req, res) => {
  const ollamaStatus = await checkOllamaHealth();
  res.json({
    status: 'ok',
    uptime: process.uptime(),
    productsLoaded: matcher.getProductCount(),
    ollama: ollamaStatus,
  });
});

app.get('/', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'index.html'));
});

async function start() {
  const csvPath = process.env.CSV_PATH || './dataset/final_narratives.csv';

  console.log('╔══════════════════════════════════════════════╗');
  console.log('║     Product Suggestor — Decision Engine      ║');
  console.log('╚══════════════════════════════════════════════╝');
  console.log('');

  try {
    const count = await matcher.init(csvPath);
    console.log(`✅ Dataset loaded: ${count} products indexed`);
  } catch (err) {
    console.error(`❌ Failed to load CSV: ${err.message}`);
    process.exit(1);
  }

  const ollamaStatus = await checkOllamaHealth();
  if (ollamaStatus.healthy) {
    console.log(`✅ Ollama connected (models: ${ollamaStatus.models.join(', ')})`);
    if (!ollamaStatus.modelAvailable) {
      console.warn(`⚠️  Model "${process.env.OLLAMA_MODEL}" not found. AI insights may fail.`);
    }
  } else {
    console.warn(`⚠️  Ollama not reachable: ${ollamaStatus.reason}`);
    console.warn('   AI-powered insights will be unavailable. CSV matches still work.');
  }

  app.listen(PORT, () => {
    console.log('');
    console.log(`🚀 Server running at http://localhost:${PORT}`);
    console.log(`📊 API endpoint:  POST http://localhost:${PORT}/api/analyze`);
    console.log(`💚 Health check:  GET  http://localhost:${PORT}/api/health`);
    console.log('');
  });
}

start();