const express = require('express');
const { v4: uuidv4 } = require('uuid');
const db = require('../db');
const router = express.Router();

// GET /api/racks?roomId=
router.get('/', (req, res) => {
  const { roomId } = req.query;
  if (!roomId) return res.status(400).json({ error: 'roomId query param required' });

  const racks = db.prepare(`
    SELECT ra.*, COUNT(c.id) as component_count
    FROM racks ra
    LEFT JOIN components c ON c.rack_id = ra.id
    WHERE ra.room_id = ?
    GROUP BY ra.id
    ORDER BY ra.name
  `).all(roomId);
  res.json(racks);
});

// GET /api/racks/:id
router.get('/:id', (req, res) => {
  const rack = db.prepare('SELECT * FROM racks WHERE id = ?').get(req.params.id);
  if (!rack) return res.status(404).json({ error: 'Rack not found' });

  const components = db.prepare(`
    SELECT * FROM components WHERE rack_id = ? ORDER BY position ASC NULLS LAST, name ASC
  `).all(req.params.id);

  // Attach ports to each component so the graphic view can show active ports
  const componentsWithPorts = components.map(c => {
    const ports = db.prepare('SELECT * FROM ports WHERE component_id = ? ORDER BY port_number').all(c.id);
    return { ...c, ports };
  });

  let room = null, site = null;
  if (rack.room_id) {
    room = db.prepare('SELECT id, name, site_id FROM rooms WHERE id = ?').get(rack.room_id);
    if (room) site = db.prepare('SELECT id, name FROM sites WHERE id = ?').get(room.site_id);
  }

  res.json({ ...rack, components: componentsWithPorts, room, site });
});

// POST /api/racks
router.post('/', (req, res) => {
  const { room_id, name, total_units, manufacturer, model, notes } = req.body;
  if (!name) return res.status(400).json({ error: 'name is required' });

  if (room_id) {
    const room = db.prepare('SELECT id FROM rooms WHERE id = ?').get(room_id);
    if (!room) return res.status(404).json({ error: 'Room not found' });
  }

  const id = uuidv4();
  db.prepare(`
    INSERT INTO racks (id, room_id, name, total_units, manufacturer, model, notes)
    VALUES (?, ?, ?, ?, ?, ?, ?)
  `).run(id, room_id || null, name, total_units || 42, manufacturer || null, model || null, notes || '');

  res.status(201).json(db.prepare('SELECT * FROM racks WHERE id = ?').get(id));
});

// PUT /api/racks/:id
router.put('/:id', (req, res) => {
  const rack = db.prepare('SELECT * FROM racks WHERE id = ?').get(req.params.id);
  if (!rack) return res.status(404).json({ error: 'Rack not found' });

  const { name, total_units, manufacturer, model, notes } = req.body;
  db.prepare(`
    UPDATE racks SET name = ?, total_units = ?, manufacturer = ?, model = ?, notes = ?,
    updated_at = CURRENT_TIMESTAMP WHERE id = ?
  `).run(
    name ?? rack.name,
    total_units ?? rack.total_units,
    manufacturer ?? rack.manufacturer,
    model ?? rack.model,
    notes ?? rack.notes,
    req.params.id
  );

  res.json(db.prepare('SELECT * FROM racks WHERE id = ?').get(req.params.id));
});

// DELETE /api/racks/:id
router.delete('/:id', (req, res) => {
  const rack = db.prepare('SELECT id FROM racks WHERE id = ?').get(req.params.id);
  if (!rack) return res.status(404).json({ error: 'Rack not found' });

  db.prepare('DELETE FROM racks WHERE id = ?').run(req.params.id);
  res.json({ ok: true });
});

module.exports = router;