const express = require('express');
const router = express.Router();
const { getDb } = require('../db');

router.get('/', (req, res) => {
  try {
    const db = getDb();
    const rows = db.prepare('SELECT * FROM customers ORDER BY name').all();
    res.json(rows);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.get('/:id', (req, res) => {
  try {
    const db = getDb();
    const row = db.prepare('SELECT * FROM customers WHERE id = ?').get(req.params.id);
    if (!row) return res.status(404).json({ error: 'Customer not found' });
    res.json(row);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.post('/', (req, res) => {
  try {
    const db = getDb();
    const { name, phone, email, address, notes } = req.body;
    if (!name || name.trim() === '') {
      return res.status(400).json({ error: 'Name is required' });
    }
    const result = db.prepare(
      'INSERT INTO customers (name, phone, email, address, notes) VALUES (?, ?, ?, ?, ?)'
    ).run(
      name.trim(),
      phone ? String(phone).trim() : null,
      email ? String(email).trim() : null,
      address ? String(address).trim() : null,
      notes ? String(notes).trim() : null
    );
    const row = db.prepare('SELECT * FROM customers WHERE id = ?').get(result.lastInsertRowid);
    res.status(201).json(row);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.put('/:id', (req, res) => {
  try {
    const db = getDb();
    const existing = db.prepare('SELECT * FROM customers WHERE id = ?').get(req.params.id);
    if (!existing) return res.status(404).json({ error: 'Customer not found' });
    const { name, phone, email, address, notes } = req.body;
    const n = name !== undefined ? name.trim() : existing.name;
    const ph = phone !== undefined ? (phone ? String(phone).trim() : null) : existing.phone;
    const e = email !== undefined ? (email ? String(email).trim() : null) : existing.email;
    const a = address !== undefined ? (address ? String(address).trim() : null) : existing.address;
    const no = notes !== undefined ? (notes ? String(notes).trim() : null) : existing.notes;
    if (!n) return res.status(400).json({ error: 'Name is required' });
    db.prepare(
      'UPDATE customers SET name = ?, phone = ?, email = ?, address = ?, notes = ? WHERE id = ?'
    ).run(n, ph, e, a, no, req.params.id);
    const row = db.prepare('SELECT * FROM customers WHERE id = ?').get(req.params.id);
    res.json(row);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.delete('/:id', (req, res) => {
  try {
    const db = getDb();
    const result = db.prepare('DELETE FROM customers WHERE id = ?').run(req.params.id);
    if (result.changes === 0) return res.status(404).json({ error: 'Customer not found' });
    res.status(204).send();
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

module.exports = router;