<?php error_reporting(0);
class Shopier
	{
		private $payment_url = 'https://www.shopier.com/ShowProduct/api_pay4.php';
		private
			$api_key,
			$api_secret,
			$module_version,
			$buyer = [],
			$currency = 'TRY';

		public function __construct($api_key, $api_secret, $module_version = ('1.0.4'))
		{
			$this->api_key = $api_key;
			$this->api_secret = $api_secret;
			$this->module_version = $module_version;
		}

		public function setBuyer(array $fields = [])
		{
			$this->buyerValidateAndLoad($this->buyerFields(), $fields);
		}

		public function setOrderBilling(array $fields = [])
		{
			$this->buyerValidateAndLoad($this->orderBillingFields(), $fields);
		}

		public function setOrderShipping(array $fields = [])
		{
			$this->buyerValidateAndLoad($this->orderShippingFields(), $fields);
		}

		private function buyerValidateAndLoad($validationFields, $fields)
		{
			$diff = array_diff_key($validationFields, $fields);

			if (count($diff) > 0)
				throw new Exception(implode(',', array_keys($diff)) . ' fields are required');

			foreach ($validationFields as $key => $buyerField) {
				$this->buyer[$key] = $fields[$key];
			}
		}

		public function generateFormObject($order_id, $order_total, $callback_url)
		{

			$diff = array_diff_key($this->buyerFields(), $this->buyer);

			if (count($diff) > 0)
				throw new Exception(implode(',', array_keys($diff)) . ' fields are required use "setBuyer()" method ');

			$diff = array_diff_key($this->orderBillingFields(), $this->buyer);

			if (count($diff) > 0)
				throw new Exception(implode(',', array_keys($diff)) . ' fields are required use "setOrderBilling()" method ');

			$diff = array_diff_key($this->orderShippingFields(), $this->buyer);

			if (count($diff) > 0)
				throw new Exception(implode(',', array_keys($diff)) . ' fields are required use "setOrderShipping()" method ');


			$args = array(
				'API_key' => $this->api_key,
				'website_index' => 1,
				'platform_order_id' => $this->buyer['id'],
				'product_name' => $this->buyer['paket'],
				'product_type' => 0, //1 : downloadable-virtual 0:real object,2:default
				'buyer_name' => $this->buyer['first_name'],
				'buyer_surname' => $this->buyer['last_name'],
				'buyer_email' => $this->buyer['email'],
				'buyer_account_age' => 0,
				'buyer_id_nr' => $this->buyer['id'],
				'buyer_phone' => $this->buyer['phone'],
				'billing_address' => $this->buyer['billing_address'],
				'billing_city' => $this->buyer['billing_city'],
				'billing_country' => $this->buyer['billing_country'],
				'billing_postcode' => $this->buyer['billing_postcode'],
				'shipping_address' => $this->buyer['shipping_address'],
				'shipping_city' => $this->buyer['shipping_city'],
				'shipping_country' => $this->buyer['shipping_country'],
				'shipping_postcode' => $this->buyer['shipping_postcode'],
				'total_order_value' => $order_total,
				'currency' => $this->getCurrency(),
				'platform' => 0,
				'is_in_frame' => 0,
				'current_language' => $this->lang(),
				'modul_version' => $this->module_version,
				'random_nr' => rand(100000, 999999)
			);


			$data = $args["random_nr"] . $args["platform_order_id"] . $args["total_order_value"] . $args["currency"];
			$signature = hash_hmac('sha256', $data, $this->api_secret, true);
			$signature = base64_encode($signature);
			$args['signature'] = $signature;
			$args['callback'] = $callback_url;

			return [
				'elements' => [
					[
						'tag' => 'form',
						'attributes' => [
							'id' => 'shopier_form_special',
							'method' => 'post',
							'action' => $this->payment_url
						],
						'children' => array_map(function ($key, $value) {
							return [
								'tag' => 'input',
								'attributes' => [
									'name' => $key,
									'value' => $value,
									'type' => 'hidden',
								]
							];

						}, array_keys($args), array_values($args))
					]
				]
			];

		}


		public function generateForm($order_id, $order_total, $callback_url)
		{
			$obj = $this->generateFormObject($order_id, $order_total, $callback_url);

			return $this->recursiveHtmlStringGenerator($obj['elements']);
		}

		public function run($order_id, $order_total, $callback_url)
		{

			$form = $this->generateForm($order_id, $order_total, $callback_url);

			return '<!doctype html>
             <html lang="en">
            <head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title></title>
     </head>
' . $form . '
    <body>
        <script type="text/javascript">
					document.getElementById("shopier_form_special").submit();
		</script>
     </body>
    </html>
     ';
		}

		// generateFormObject() sınıfının verdiği formattaki arrayden structure çıkartan yapıdırı.
		private function recursiveHtmlStringGenerator(array $elements = [], $string = null)
		{
			foreach ($elements as $element) {
				$attributes = $element['attributes'];
				$attributes = array_map(function ($key, $value) {
					return $key . '="' . $value . '"';
				}, array_keys($attributes), array_values($attributes));
				$attribute_string = implode(' ', $attributes);
				$html_in = $element['source'];
				$string .= "<{$element['tag']} {$attribute_string} > " . $html_in;

				if (isset($element['children']) && is_array($element['children']))
					$string = $this->recursiveHtmlStringGenerator($element['children'], $string);

				$string .= "</{$element['tag']}>";

			}
			return $string;
		}


		//shopierden gelen dataları kontrol eder.
		public function verifyShopierSignature($post_data)
		{

			if (isset($post_data['platform_order_id'])) {
				$order_id = $post_data['platform_order_id'];
				$random_nr = $post_data['random_nr'];
				if ($order_id != '') {
					$signature = base64_decode($_POST["signature"]);
					$expected = hash_hmac('sha256', $random_nr . $order_id, $this->api_secret, true);

					if ($signature == $expected)
						return true;

				}


			}
			return false;
		}

		private function buyerFields()
		{
			return [
				'id' => true,
				'first_name' => true,
				'last_name' => true,
				'email' => true,
				'phone' => true,
			];
		}

		private function orderBillingFields()
		{
			return [
				'billing_address' => true,
				'billing_city' => true,
				'billing_country' => true,
				'billing_postcode' => true,
			];
		}

		private function orderShippingFields()
		{
			return [
				'shipping_address' => true,
				'shipping_city' => true,
				'shipping_country' => true,
				'shipping_postcode' => true,
			];
		}

		private function getCurrency()
		{
			$currencyList = [
				'TRY' => 0,
				'USD' => 1,
				'EUR' => 2,
			];
			return $currencyList[strtoupper($this->currency)];
		}

		private function lang()
		{
			$current_language = "tr-TR";
			$current_lan = 1;
			if ($current_language == "tr-TR") {
				$current_lan = 0;
			}

			return $current_lan;
		}

	}
