const express = require('express');
const router = express.Router();

// Get all active users for the "view as" dropdown
router.get('/users', async (req, res) => {
  try {
    const result = await global.pool.query(`
      SELECT id, username, name, type, active
      FROM users 
      WHERE active = true AND type = 'user'
      ORDER BY name ASC
    `);
    
    res.json({
      status: 'success',
      users: result.rows
    });
  } catch (error) {
    console.error('Error fetching users:', error);
    res.status(500).json({ 
      status: 'error',
      error: 'Failed to fetch users',
      details: error.message
    });
  }
});

// Get rooms for a specific user
router.get('/users/:userId/rooms', async (req, res) => {
  const { userId } = req.params;
  
  try {
    // Get rooms where the user is a member
    const result = await global.pool.query(`
      SELECT DISTINCT r.id, r.name, r.fname, r.t as type, r.msgs, r.lm as last_message_date
      FROM room r, subscription s
      WHERE s.rid = r.mongo_id 
      AND s.u->>'_id' = (SELECT mongo_id FROM users WHERE id = $1)
      AND r.archived IS NOT TRUE
      ORDER BY r.lm DESC NULLS LAST
      LIMIT 50
    `, [userId]);
    
    res.json({
      status: 'success',
      rooms: result.rows
    });
  } catch (error) {
    console.error('Error fetching user rooms:', error);
    res.status(500).json({ 
      status: 'error',
      error: 'Failed to fetch user rooms',
      details: error.message
    });
  }
});

// Get messages for a specific room
router.get('/rooms/:roomId/messages', async (req, res) => {
  const { roomId } = req.params;
  const { limit = 50, offset = 0 } = req.query;
  
  try {
    const result = await global.pool.query(`
      SELECT m.id, m.msg, m.ts, m.u, m._updatedat
      FROM message m
      JOIN room r ON m.rid = r.mongo_id
      WHERE r.id = $1
      ORDER BY m.ts DESC
      LIMIT $2 OFFSET $3
    `, [roomId, limit, offset]);
    
    res.json({
      status: 'success',
      messages: result.rows
    });
  } catch (error) {
    console.error('Error fetching messages:', error);
    res.status(500).json({ 
      status: 'error',
      error: 'Failed to fetch messages',
      details: error.message
    });
  }
});

module.exports = router;