import express from 'express';
import pg from 'pg';
const { Pool } = pg;
import multer from 'multer';
import { randomUUID } from 'crypto';
import path from 'path';
import { fileURLToPath } from 'url';
import fs from 'fs';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const PORT = 7060;
const UPLOAD_DIR = '/opt/amos/data/quixzoom-uploads';

// PostgreSQL connection
const pool = new Pool({
  host: 'localhost',
  port: 5432,
  database: 'amos',
  user: 'postgres',
  password: 'quixzo…2026'
});

fs.mkdirSync(UPLOAD_DIR, { recursive: true });

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

const upload = multer({
  dest: UPLOAD_DIR,
  limits: { fileSize: 50 * 1024 * 1024 },
});

// Serve uploaded images
app.use('/uploads', express.static(UPLOAD_DIR));

// Health check
app.get('/health', async (req, res) => {
  try {
    const result = await pool.query('SELECT COUNT(*) FROM quixzoom.missions');
    res.json({
      status: 'ok',
      service: 'quixzoom-mission-engine',
      port: PORT,
      missions_total: parseInt(result.rows[0].count),
      uptime_seconds: process.uptime(),
      timestamp: new Date().toISOString()
    });
  } catch (e) {
    res.status(500).json({ status: 'error', error: e.message });
  }
});

// GET /missions — list all missions
app.get('/missions', async (req, res) => {
  try {
    const result = await pool.query(`
      SELECT 
        id,
        title,
        description,
        latitude as lat,
        longitude as lon,
        area_name as address,
        status,
        reward_credits as reward_sek,
        required_photos,
        created_at,
        expires_at
      FROM quixzoom.missions
      ORDER BY created_at DESC
    `);
    
    res.json({
      missions: result.rows,
      count: result.rows.length
    });
  } catch (e) {
    res.status(500).json({ error: e.message });
  }
});

// GET /api/v1/missions — API format for admin
app.get('/api/v1/missions', async (req, res) => {
  try {
    const { status, limit = 50, offset = 0 } = req.query;
    
    let query = `
      SELECT 
        m.id,
        m.title,
        m.description,
        m.latitude as lat,
        m.longitude as lon,
        m.area_name as address,
        m.status,
        m.reward_credits as reward_sek,
        m.required_photos,
        m.created_at,
        m.expires_at,
        COUNT(s.id) as submission_count
      FROM quixzoom.missions m
      LEFT JOIN quixzoom.submissions s ON s.mission_id = m.id
    `;
    
    const params = [];
    if (status) {
      query += ' WHERE m.status = $1';
      params.push(status);
    }
    
    query += ` GROUP BY m.id ORDER BY m.created_at DESC LIMIT $${params.length + 1} OFFSET $${params.length + 2}`;
    params.push(limit, offset);
    
    const result = await pool.query(query, params);
    
    res.json({
      missions: result.rows,
      count: result.rows.length,
      total: parseInt((await pool.query('SELECT COUNT(*) FROM quixzoom.missions')).rows[0].count)
    });
  } catch (e) {
    res.status(500).json({ error: e.message });
  }
});

// GET /api/v1/stats — dashboard stats
app.get('/api/v1/stats', async (req, res) => {
  try {
    const missionsResult = await pool.query('SELECT COUNT(*) FROM quixzoom.missions');
    const activeResult = await pool.query("SELECT COUNT(*) FROM quixzoom.missions WHERE status = 'active'");
    const submissionsResult = await pool.query('SELECT COUNT(*) FROM quixzoom.submissions');
    const contributorsResult = await pool.query('SELECT COUNT(DISTINCT user_id) FROM quixzoom.submissions');
    
    res.json({
      missions_total: parseInt(missionsResult.rows[0].count),
      missions_active: parseInt(activeResult.rows[0].count),
      submissions_total: parseInt(submissionsResult.rows[0].count),
      contributors_total: parseInt(contributorsResult.rows[0].count)
    });
  } catch (e) {
    res.status(500).json({ error: e.message });
  }
});

// Start server
app.listen(PORT, () => {
  console.log(`quixzoom-mission (PostgreSQL) running on port ${PORT}`);
});