/**
 * Complaint Controller - Admin Resolution of User Issues (PostgreSQL)
 */
const { getPool } = require('../db');
const { eventBus, EVENTS } = require('../services/eventBus');

/**
 * List all complaints in the system
 */
async function list(req, res) {
  const { status, limit = 50, offset = 0 } = req.query;
  const pool = getPool();
  if (!pool) return res.status(500).json({ error: 'Database not connected' });
  
  try {
    let query = 'SELECT c.*, u.name as user_name FROM complaints c JOIN users u ON c.user_id = u.id WHERE 1=1';
    const params = [];
    let paramCounter = 1;
    
    if (status) {
      query += ` AND c.status = $${paramCounter++}`;
      params.push(status);
    }
    
    query += ` ORDER BY c.created_at DESC LIMIT $${paramCounter++} OFFSET $${paramCounter++}`;
    params.push(parseInt(limit), parseInt(offset));
    
    const result = await pool.query(query, params);
    res.json({ success: true, count: result.rows.length, data: result.rows });
  } catch (error) {
    console.error('[Complaint List Error]', error.message);
    res.status(500).json({ error: 'Failed to fetch complaints' });
  }
}

/**
 * Get complaint by ID
 */
async function show(req, res) {
  const { id } = req.params;
  const pool = getPool();
  if (!pool) return res.status(500).json({ error: 'Database not connected' });
  
  try {
    const query = 'SELECT c.*, u.name as user_name, u.email as user_email FROM complaints c JOIN users u ON c.user_id = u.id WHERE c.id = $1';
    const result = await pool.query(query, [id]);
    
    if (result.rows.length === 0) {
      return res.status(404).json({ error: 'Complaint not found' });
    }
    
    res.json({ success: true, data: result.rows[0] });
  } catch (error) {
    console.error('[Complaint Get Error]', error.message);
    res.status(500).json({ error: 'Failed to fetch complaint' });
  }
}

/**
 * Update complaint status (Resolve)
 */
async function update(req, res) {
  const { id } = req.params;
  const { status, resolution } = req.body;
  const pool = getPool();
  if (!pool) return res.status(500).json({ error: 'Database not connected' });
  
  try {
    const query = 'UPDATE complaints SET status = $2, resolution = $3, updated_at = NOW() WHERE id = $1';
    await pool.query(query, [id, status, resolution || '']);
    
    if (status === 'resolved') {
      eventBus.emit(EVENTS.COMPLAINT_RESOLVED, { complaint_id: id });
    }
    
    res.json({ success: true, message: `Complaint status updated to ${status}` });
  } catch (error) {
    console.error('[Complaint Update Error]', error.message);
    res.status(500).json({ error: 'Failed to update complaint' });
  }
}

module.exports = { list, show, update };