OpenCart 🇺🇦

$this->language->load('checkout/checkout');

$json = array();

// Validate if customer is logged in.
if ($this->customer->isLogged()) {
	$json['redirect'] = $this->url->link('checkout/checkout', '', 'SSL');
} 			

// Validate cart has products and has stock.
if ((!$this->cart->hasProducts() && empty($this->session->data['vouchers'])) || (!$this->cart->hasStock() && !$this->config->get('config_stock_checkout'))) {
	$json['redirect'] = $this->url->link('checkout/cart');		
}

// Check if guest checkout is avaliable.	
if (!$this->config->get('config_guest_checkout') || $this->config->get('config_customer_price') || $this->cart->hasDownload()) {
	$json['redirect'] = $this->url->link('checkout/checkout', '', 'SSL');
} 

if (!$json) {		
	if ((utf8_strlen($this->request->post['firstname']) < 1) || (utf8_strlen($this->request->post['firstname']) > 32)) {
		$json['error']['firstname'] = $this->language->get('error_firstname');
	}

	if ((utf8_strlen($this->request->post['lastname']) < 1) || (utf8_strlen($this->request->post['lastname']) > 32)) {
		$json['error']['lastname'] = $this->language->get('error_lastname');
	}
	
	if ((utf8_strlen($this->request->post['address_1']) < 3) || (utf8_strlen($this->request->post['address_1']) > 128)) {
		$json['error']['address_1'] = $this->language->get('error_address_1');
	}

	if ((utf8_strlen($this->request->post['city']) < 2) || (utf8_strlen($this->request->post['city']) > 128)) {
		$json['error']['city'] = $this->language->get('error_city');
	}
	
	$this->load->model('localisation/country');
	
	$country_info = $this->model_localisation_country->getCountry($this->request->post['country_id']);
	
	if ($country_info && $country_info['postcode_required'] && (utf8_strlen($this->request->post['postcode']) < 2) || (utf8_strlen($this->request->post['postcode']) > 10)) {
		$json['error']['postcode'] = $this->language->get('error_postcode');
	}

	if ($this->request->post['country_id'] == '') {
		$json['error']['country'] = $this->language->get('error_country');
	}
	
	if (!isset($this->request->post['zone_id']) || $this->request->post['zone_id'] == '') {
		$json['error']['zone'] = $this->language->get('error_zone');
	}	
}

if (!$json) {
	$this->session->data['guest']['shipping']['firstname'] = trim($this->request->post['firstname']);
	$this->session->data['guest']['shipping']['lastname'] = trim($this->request->post['lastname']);
	$this->session->data['guest']['shipping']['company'] = trim($this->request->post['company']);
	$this->session->data['guest']['shipping']['address_1'] = $this->request->post['address_1'];
	$this->session->data['guest']['shipping']['address_2'] = $this->request->post['address_2'];
	$this->session->data['guest']['shipping']['postcode'] = $this->request->post['postcode'];
	$this->session->data['guest']['shipping']['city'] = $this->request->post['city'];
	$this->session->data['guest']['shipping']['country_id'] = $this->request->post['country_id'];
	$this->session->data['guest']['shipping']['zone_id'] = $this->request->post['zone_id'];
	
	$this->load->model('localisation/country');
	
	$country_info = $this->model_localisation_country->getCountry($this->request->post['country_id']);
	
	if ($country_info) {
		$this->session->data['guest']['shipping']['country'] = $country_info['name'];	
		$this->session->data['guest']['shipping']['iso_code_2'] = $country_info['iso_code_2'];
		$this->session->data['guest']['shipping']['iso_code_3'] = $country_info['iso_code_3'];
		$this->session->data['guest']['shipping']['address_format'] = $country_info['address_format'];
	} else {
		$this->session->data['guest']['shipping']['country'] = '';	
		$this->session->data['guest']['shipping']['iso_code_2'] = '';
		$this->session->data['guest']['shipping']['iso_code_3'] = '';
		$this->session->data['guest']['shipping']['address_format'] = '';
	}
	
	$this->load->model('localisation/zone');
					
	$zone_info = $this->model_localisation_zone->getZone($this->request->post['zone_id']);

	if ($zone_info) {
		$this->session->data['guest']['shipping']['zone'] = $zone_info['name'];
		$this->session->data['guest']['shipping']['zone_code'] = $zone_info['code'];
	} else {
		$this->session->data['guest']['shipping']['zone'] = '';
		$this->session->data['guest']['shipping']['zone_code'] = '';
	}
	
	$this->session->data['shipping_country_id'] = $this->request->post['country_id'];
	$this->session->data['shipping_zone_id'] = $this->request->post['zone_id'];
	$this->session->data['shipping_postcode'] = $this->request->post['postcode'];	
	
	unset($this->session->data['shipping_method']);	
	unset($this->session->data['shipping_methods']);
}

$this->response->setOutput(json_encode($json));