const express = require('express');
const { Op } = require('sequelize');
const { User, Customer, Car } = require('../models');
const { authenticate, requireAdmin } = require('../middleware/auth');
const api = require('../lib/api');

const router = express.Router();
const route = api.asyncRoute;
router.use(route(authenticate));

router.post('/auth/login', route(async (req, res) => {
  await req.user.update({ last_login: new Date() });
  return api.response(res, api.cleanUser(req.user));
}));

router.route('/auth/me')
  .get((req, res) => api.response(res, api.cleanUser(req.user)))
  .put(route((req, res) => updateProfile(req, res)))
  .patch(route((req, res) => updateProfile(req, res)));

async function updateProfile(req, res) {
  const data = api.pick(req.body, api.PROFILE_FIELDS);
  const errors = api.validateUser(data, false);
  if (Object.keys(errors).length) return api.validationResponse(res, errors);
  await req.user.update(data);
  return api.response(res, api.cleanUser(req.user));
}

router.route('/users')
  .all(requireAdmin)
  .get(route(async (req, res) => {
    const options = api.pageOptions(req.query, ['id', ...api.USER_FIELDS.filter((field) => field !== 'password'), 'last_login', 'created', 'modified']);
    const where = {};
    if (req.query.q) where[Op.or] = ['login', 'email', 'first_name', 'last_name'].map((field) => ({ [field]: { [Op.like]: `%${req.query.q}%` } }));
    if (req.query.role) where.role = req.query.role;
    if (req.query.active !== undefined) where.active = req.query.active === 'true' || req.query.active === '1';
    const result = await User.findAndCountAll({ where, limit: options.limit, offset: options.offset, order: [[options.sort, options.direction]] });
    const total = result.count;
    res.set('X-Total-Count', String(total));
    return api.response(res, result.rows.map(api.cleanUser), 200, {
      meta: { page: options.page, limit: options.limit, total, pages: Math.ceil(total / options.limit), has_next_page: options.page * options.limit < total, has_prev_page: options.page > 1, sort: options.sort, direction: options.direction.toLowerCase() },
    });
  }))
  .post(route(async (req, res) => {
    const data = api.pick(req.body, api.USER_FIELDS);
    if (data.active === undefined) data.active = true;
    if (data.role === undefined) data.role = 'user';
    const errors = api.validateUser(data, true);
    if (Object.keys(errors).length) return api.validationResponse(res, errors);
    try {
      const user = await User.create(data);
      res.location(`/api/users/${user.id}`);
      return api.response(res, api.cleanUser(user), 201);
    } catch (error) { return api.fail(res, error); }
  }));

router.route('/users/:id')
  .all(requireAdmin)
  .get(route(async (req, res) => {
    const user = await User.findByPk(req.params.id);
    return user ? api.response(res, api.cleanUser(user)) : api.notFound(res, 'User');
  }))
  .put(route((req, res) => updateUser(req, res)))
  .patch(route((req, res) => updateUser(req, res)))
  .delete(route(async (req, res) => {
    const user = await User.findByPk(req.params.id);
    if (!user) return api.notFound(res, 'User');
    if (user.id === req.user.id) return res.status(400).json({ success: false, error: { code: 400, message: 'You cannot delete your own account.' } });
    await user.destroy();
    return api.response(res, null, 204);
  }));

async function updateUser(req, res) {
  const user = await User.findByPk(req.params.id);
  if (!user) return api.notFound(res, 'User');
  const data = api.pick(req.body, api.USER_FIELDS);
  if (user.id === req.user.id) {
    if (data.role !== undefined && data.role !== user.role) return res.status(400).json({ success: false, error: { code: 400, message: 'You cannot change your own role.' } });
    if (data.active === false) return res.status(400).json({ success: false, error: { code: 400, message: 'You cannot deactivate your own account.' } });
  }
  const errors = api.validateUser(data, false);
  if (Object.keys(errors).length) return api.validationResponse(res, errors);
  try {
    await user.update(data);
    return api.response(res, api.cleanUser(user));
  } catch (error) { return api.fail(res, error); }
}

router.route('/customers')
  .get(route(async (req, res) => {
    const options = api.pageOptions(req.query, ['id', 'type', 'first_name', 'last_name', 'email', 'company_name', 'city', 'country', 'created', 'modified']);
    const where = {};
    if (req.query.q) where[Op.or] = ['first_name', 'last_name', 'email', 'phone', 'company_name', 'city', 'tax_id'].map((field) => ({ [field]: { [Op.like]: `%${req.query.q}%` } }));
    for (const field of ['type', 'city', 'country']) if (req.query[field]) where[field] = req.query[field];
    const include = String(req.query.with_cars).toLowerCase() === 'true' || req.query.with_cars === '1' ? [{ model: Car, as: 'cars' }] : undefined;
    return api.list(res, Customer, { ...options, where }, include);
  }))
  .post(route(async (req, res) => {
    const data = api.pick(req.body, api.CUSTOMER_FIELDS);
    if (data.type === undefined) data.type = 'individual';
    if (data.country === undefined) data.country = 'PL';
    const errors = api.validateCustomer(data, true);
    if (Object.keys(errors).length) return api.validationResponse(res, errors);
    try {
      const customer = await Customer.create({ ...data, created_by: req.user.id });
      res.location(`/api/customers/${customer.id}`);
      return api.response(res, customer, 201);
    } catch (error) { return api.fail(res, error); }
  }));

router.route('/customers/:id')
  .get(route(async (req, res) => {
    const customer = await Customer.findByPk(req.params.id, { include: [{ model: Car, as: 'cars' }] });
    return customer ? api.response(res, customer) : api.notFound(res, 'Customer');
  }))
  .put(route((req, res) => updateCustomer(req, res)))
  .patch(route((req, res) => updateCustomer(req, res)))
  .delete(route(async (req, res) => {
    const customer = await Customer.findByPk(req.params.id);
    if (!customer) return api.notFound(res, 'Customer');
    await customer.destroy();
    return api.response(res, null, 204);
  }));

async function updateCustomer(req, res) {
  const customer = await Customer.findByPk(req.params.id);
  if (!customer) return api.notFound(res, 'Customer');
  const data = api.pick(req.body, api.CUSTOMER_FIELDS);
  const errors = api.validateCustomer(data, false);
  if (Object.keys(errors).length) return api.validationResponse(res, errors);
  try {
    await customer.update(data);
    return api.response(res, customer);
  } catch (error) { return api.fail(res, error); }
}

router.route('/customers/:customer_id/cars')
  .get(route(async (req, res) => {
    const customer = await Customer.findByPk(req.params.customer_id);
    if (!customer) return api.notFound(res, 'Customer');
    const options = api.pageOptions(req.query, ['id', 'customer_id', 'make', 'model', 'production_year', 'registration_number', 'fuel_type', 'mileage', 'power_hp', 'created', 'modified']);
    return api.list(res, Car, { ...options, where: { customer_id: customer.id } });
  }))
  .post(route(async (req, res) => {
    const customer = await Customer.findByPk(req.params.customer_id);
    if (!customer) return api.notFound(res, 'Customer');
    return createCar(req, res, customer.id);
  }));

router.route('/cars')
  .get(route(async (req, res) => {
    const options = api.pageOptions(req.query, ['id', 'customer_id', 'make', 'model', 'production_year', 'registration_number', 'fuel_type', 'mileage', 'power_hp', 'created', 'modified']);
    const where = {};
    if (req.query.customer_id) where.customer_id = req.query.customer_id;
    if (req.query.q) where[Op.or] = ['make', 'model', 'vin', 'registration_number'].map((field) => ({ [field]: { [Op.like]: `%${req.query.q}%` } }));
    for (const field of ['make', 'fuel_type', 'transmission']) if (req.query[field]) where[field] = req.query[field];
    if (req.query.year_from) where.production_year = { ...(where.production_year || {}), [Op.gte]: Number(req.query.year_from) };
    if (req.query.year_to) where.production_year = { ...(where.production_year || {}), [Op.lte]: Number(req.query.year_to) };
    const include = String(req.query.with_customer).toLowerCase() === 'true' || req.query.with_customer === '1' ? [{ model: Customer, as: 'customer' }] : undefined;
    return api.list(res, Car, { ...options, where }, include);
  }))
  .post(route((req, res) => createCar(req, res)));

async function createCar(req, res, customerId) {
  const data = api.pick(req.body, api.CAR_FIELDS);
  if (customerId !== undefined) data.customer_id = customerId;
  const errors = api.validateCar(data, true);
  if (Object.keys(errors).length) return api.validationResponse(res, errors);
  try {
    const car = await Car.create(data);
    res.location(`/api/cars/${car.id}`);
    return api.response(res, car, 201);
  } catch (error) { return api.fail(res, error); }
}

router.route('/cars/:id')
  .get(route(async (req, res) => {
    const car = await Car.findByPk(req.params.id, { include: [{ model: Customer, as: 'customer' }] });
    return car ? api.response(res, car) : api.notFound(res, 'Car');
  }))
  .put(route((req, res) => updateCar(req, res)))
  .patch(route((req, res) => updateCar(req, res)))
  .delete(route(async (req, res) => {
    const car = await Car.findByPk(req.params.id);
    if (!car) return api.notFound(res, 'Car');
    await car.destroy();
    return api.response(res, null, 204);
  }));

async function updateCar(req, res) {
  const car = await Car.findByPk(req.params.id);
  if (!car) return api.notFound(res, 'Car');
  const data = api.pick(req.body, api.CAR_FIELDS);
  const errors = api.validateCar(data, false);
  if (Object.keys(errors).length) return api.validationResponse(res, errors);
  try {
    await car.update(data);
    return api.response(res, car);
  } catch (error) { return api.fail(res, error); }
}

module.exports = router;