<?php
namespace Opencart\Admin\Controller\Extension\Hutko\Payment;

class Hutko extends \Opencart\System\Engine\Controller {
	private $checkout_url = 'https://pay.hutko.org/api/checkout/url/';
	private $refund_url   = 'https://pay.hutko.org/api/reverse/order_id';
	private $status_url   = 'https://pay.hutko.org/api/status/order_id';

	public function index(): void {
		$this->load->language('extension/hutko/payment/hutko');
		$this->document->setTitle($this->language->get('heading_title'));

		$data['breadcrumbs'] = [];
		$data['breadcrumbs'][] = [
			'text' => $this->language->get('text_home'),
			'href' => $this->url->link('common/dashboard', 'user_token=' . $this->session->data['user_token'])
		];
		$data['breadcrumbs'][] = [
			'text' => $this->language->get('text_extension'),
			'href' => $this->url->link('marketplace/extension', 'user_token=' . $this->session->data['user_token'] . '&type=payment')
		];
		$data['breadcrumbs'][] = [
			'text' => $this->language->get('heading_title'),
			'href' => $this->url->link('extension/hutko/payment/hutko', 'user_token=' . $this->session->data['user_token'])
		];

		$data['save'] = $this->url->link('extension/hutko/payment/hutko.save', 'user_token=' . $this->session->data['user_token']);
		$data['back'] = $this->url->link('marketplace/extension', 'user_token=' . $this->session->data['user_token'] . '&type=payment');

		// Config fields
		$fields = [
			'payment_hutko_merchant_id', 'payment_hutko_secret_key', 'payment_hutko_shipping_include',
			'payment_hutko_shipping_product_name', 'payment_hutko_shipping_product_code',
			'payment_hutko_new_order_status_id', 'payment_hutko_success_status_id', 'payment_hutko_declined_status_id',
			'payment_hutko_expired_status_id', 'payment_hutko_refunded_status_id', 'payment_hutko_include_discount_to_total',
			'payment_hutko_status', 'payment_hutko_sort_order', 'payment_hutko_geo_zone_id', 'payment_hutko_total', 'payment_hutko_save_logs'
		];

		foreach ($fields as $field) {
			$data[$field] = $this->config->get($field);
		}

		// Defaults
		if (is_null($data['payment_hutko_shipping_product_name'])) $data['payment_hutko_shipping_product_name'] = 'Shipping';
		if (is_null($data['payment_hutko_shipping_product_code'])) $data['payment_hutko_shipping_product_code'] = 'SHIPPING_001';
		if (is_null($data['payment_hutko_total'])) $data['payment_hutko_total'] = '0.01';
		if (is_null($data['payment_hutko_shipping_include'])) $data['payment_hutko_shipping_include'] = 1;
		if (is_null($data['payment_hutko_include_discount_to_total'])) $data['payment_hutko_include_discount_to_total'] = 1;

		$this->load->model('localisation/order_status');
		$data['order_statuses'] = $this->model_localisation_order_status->getOrderStatuses();

		$this->load->model('localisation/geo_zone');
		$data['geo_zones'] = $this->model_localisation_geo_zone->getGeoZones();

		$data['log_content'] = $this->displayLastDayLog();

		$data['header'] = $this->load->controller('common/header');
		$data['column_left'] = $this->load->controller('common/column_left');
		$data['footer'] = $this->load->controller('common/footer');

		$this->response->setOutput($this->load->view('extension/hutko/payment/hutko', $data));
	}

	public function save(): void {
		$this->load->language('extension/hutko/payment/hutko');
		$json = [];

		if (!$this->user->hasPermission('modify', 'extension/hutko/payment/hutko')) {
			$json['error']['warning'] = $this->language->get('error_permission');
		}

		if (empty($this->request->post['payment_hutko_merchant_id']) || !is_numeric($this->request->post['payment_hutko_merchant_id'])) {
			$json['error']['payment_hutko_merchant_id'] = $this->language->get('error_merchant_id_numeric');
		}

		$key = $this->request->post['payment_hutko_secret_key'] ?? '';
		if (empty($key) || ($key != 'test' && (strlen($key) < 10 || is_numeric($key)))) {
			$json['error']['payment_hutko_secret_key'] = $this->language->get('error_secret_key_invalid');
		}

		if (!$json) {
			$this->load->model('setting/setting');
			$this->model_setting_setting->editSetting('payment_hutko', $this->request->post);
			$json['success'] = $this->language->get('text_success');
		}

		$this->response->addHeader('Content-Type: application/json');
		$this->response->setOutput(json_encode($json));
	}

	public function install(): void {
		$this->load->model('extension/hutko/payment/hutko');
		$this->model_extension_hutko_payment_hutko->install();
		// No event registration needed - we use the native 'order()' method now
	}

	public function uninstall(): void {
		$this->load->model('setting/event');
		$this->model_setting_event->deleteEventByCode('hutko_order_info'); // Cleanup old events if any
	}

	/**
	 * Native OpenCart Order Info hook.
	 * OC4 calls this method automatically if the payment method is 'hutko'.
	 * It renders the content into a Tab in the Order Info page.
	 */
	public function order(): string {
		$this->load->language('extension/hutko/payment/hutko');

		// In OC4, load->controller calls for order info don't always pass arguments, 
		// so we rely on the global request
		$order_id = isset($this->request->get['order_id']) ? (int)$this->request->get['order_id'] : 0;
		if (!$order_id) return '';

		$this->load->model('extension/hutko/payment/hutko');
		$transactions = $this->model_extension_hutko_payment_hutko->getTransactions($order_id);
		
		$data['transactions'] = [];
		foreach ($transactions as $t) {
			$payload_arr = json_decode($t['payload'], true);
		if (isset($payload_arr['request_data']['reservation_data'])) {
				$inner = json_decode(base64_decode($payload_arr['request_data']['reservation_data']), true);
				if ($inner) $payload_arr['request_data']['reservation_data'] = $inner;
			}
			
			// FIX: Pretty print with unescaped characters for better readability
			$pretty_payload = $payload_arr ? json_encode($payload_arr, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) : $t['payload'];				
			$data['transactions'][] = [
				'date'      => date($this->language->get('datetime_format'), strtotime($t['date_added'])),
				'ref'       => $t['hutko_ref'],
				'type'      => $t['type'],
				'status'    => $t['status'],
				'amount'    => $t['amount'] . ' ' . $t['currency'],
				'payload'   => $pretty_payload,
				'can_refund'=> ($t['type'] == 'callback' && $t['status'] == 'success')
			];
		}

		$data['order_id'] = $order_id;
		$data['user_token'] = $this->session->data['user_token'];
		
		$data['refund_url'] = $this->url->link('extension/hutko/payment/hutko.refund', 'user_token=' . $this->session->data['user_token'] . '&order_id=' . $order_id, true);
		$data['status_url'] = $this->url->link('extension/hutko/payment/hutko.status', 'user_token=' . $this->session->data['user_token'], true);
		$data['create_link_url'] = $this->url->link('extension/hutko/payment/hutko.create_payment_link', 'user_token=' . $this->session->data['user_token'] . '&order_id=' . $order_id, true);

		$data['text_payment_information'] = $this->language->get('text_payment_information');
		$data['text_hutko_refund_title'] = $this->language->get('text_hutko_refund_title');
		$data['button_hutko_refund'] = $this->language->get('button_hutko_refund');
		$data['button_hutko_status_check'] = $this->language->get('button_hutko_status_check');
		$data['button_create_link'] = 'Create New Payment Link';
		$data['text_confirm_refund'] = $this->language->get('text_confirm_refund');
		$data['text_loading'] = $this->language->get('text_loading');
		$data['text_no_transactions'] = 'No Hutko transactions recorded.';
		$data['entry_refund_amount'] = $this->language->get('entry_refund_amount');
		$data['entry_refund_comment'] = $this->language->get('entry_refund_comment');
		
		$data['text_create_link_info'] = 'Create a new payment link using current order totals.';

		return $this->load->view('extension/hutko/payment/hutko_order_info_panel', $data);
	}

public function create_payment_link(): void {
		$this->load->language('extension/hutko/payment/hutko');
		$this->load->model('extension/hutko/payment/hutko');
		$this->load->model('sale/order');

		$json = [];
		$order_id = (int)($this->request->get['order_id'] ?? 0);
		$order_info = $this->model_sale_order->getOrder($order_id);

		if ($order_info) {
			$hutko_ref = $order_id . '#ADM' . time(); 
			
			$request_data = $this->buildRequest($order_info, $hutko_ref);

			if (!$request_data) {
				$json['error'] = $this->language->get('error_payment_data_build');
			} else {
				$response = $this->api($this->checkout_url, $request_data);

				if (($response['response']['response_status'] ?? '') === 'success' && !empty($response['response']['checkout_url'])) {
					$url = $response['response']['checkout_url'];
					
					$this->model_extension_hutko_payment_hutko->logTransaction(
						$order_id,
						$hutko_ref,
						'payment_request_admin',
						'created',
						$request_data['amount'] / 100,
						$request_data['currency'],
						[
							'request_data' => $request_data,
							'checkout_url' => $url,
							'admin_user'   => $this->user->getUserName()
						]
					);

					if ((int)$order_info['order_status_id'] == 0) {
						$new_status_id = (int)$this->config->get('payment_hutko_new_order_status_id');
						if ($new_status_id <= 0) $new_status_id = 1; // Default to Pending
						
						$this->model_extension_hutko_payment_hutko->addOrderHistory($order_id, $new_status_id, 'Payment Link Created (Admin)', false);
					}

					$json['success'] = 'Payment Link Created Successfully';
					$json['url'] = $url;
				} else {
					$err = $response['response']['error_message'] ?? 'API Error';
					$json['error'] = $err;
					
					$this->model_extension_hutko_payment_hutko->logTransaction(
						$order_id,
						$hutko_ref,
						'payment_request_admin',
						'failed',
						$request_data['amount'] / 100,
						$request_data['currency'],
						['error' => $err, 'api_response' => $response]
					);
				}
			}
		} else {
			$json['error'] = 'Order not found';
		}

		$this->response->addHeader('Content-Type: application/json');
		$this->response->setOutput(json_encode($json));
	}

	public function refund(): void {
		$this->load->language('extension/hutko/payment/hutko');
		$this->load->model('extension/hutko/payment/hutko');
		$this->load->model('sale/order');

		$json = [];
		$order_id = (int)($this->request->post['order_id'] ?? 0);
		$amount = (float)($this->request->post['refund_amount'] ?? 0); 
		$comment = (string)($this->request->post['refund_comment'] ?? ''); 
		$hutko_ref = (string)($this->request->post['hutko_ref'] ?? ''); 
		
		if (empty($hutko_ref)) {
			// Find the successful payment if ref not provided
			$transactions = $this->model_extension_hutko_payment_hutko->getTransactions($order_id);
			foreach($transactions as $t) {
				if ($t['type'] == 'callback' && $t['status'] == 'success') {
					$hutko_ref = $t['hutko_ref'];
					break;
				}
			}
		}

		$order_info = $this->model_sale_order->getOrder($order_id);

		if ($hutko_ref && $order_info && $amount > 0) {
			$data = [
				'order_id'    => $hutko_ref,
				'merchant_id' => $this->config->get('payment_hutko_merchant_id'),
				'version'     => '1.0',
				'amount'      => round($amount * 100),
				'currency'    => $order_info['currency_code'],
				'comment'     => $comment
			];
			$data['signature'] = $this->sign($data);
			
			$response = $this->api($this->refund_url, $data);
			
			$this->model_extension_hutko_payment_hutko->logTransaction(
				$order_id,
				$hutko_ref,
				'refund',
				(($response['response']['reverse_status'] ?? '') === 'approved') ? 'success' : 'failed',
				$amount,
				$order_info['currency_code'],
				$response
			);

			if (($response['response']['reverse_status'] ?? '') === 'approved') {
				$json['success'] = $this->language->get('text_refund_success');
				$rev_amt = isset($response['response']['reversal_amount']) ? $response['response']['reversal_amount']/100 : $amount;
				
				$msg = sprintf($this->language->get('text_refund_success_comment'), 
					$hutko_ref, 
					$this->currency->format($rev_amt, $order_info['currency_code'], $order_info['currency_value']), 
					$comment
				);
				
				$this->model_extension_hutko_payment_hutko->addOrderHistory($order_id, $this->config->get('payment_hutko_refunded_status_id'), $msg, true);
			} else {
				$err = $response['response']['error_message'] ?? 'Unknown Error';
				$json['error'] = sprintf($this->language->get('text_refund_api_error'), $err);
			}
		} else {
			$json['error'] = $this->language->get('error_invalid_request');
		}

		$this->response->addHeader('Content-Type: application/json');
		$this->response->setOutput(json_encode($json));
	}

	public function status(): void {
		$this->load->language('extension/hutko/payment/hutko');
		$json = [];
		$ref = $this->request->post['hutko_transaction_ref'] ?? '';
		if ($ref) {
			$data = [
				'order_id'    => $ref,
				'merchant_id' => $this->config->get('payment_hutko_merchant_id'),
				'version'     => '1.0',
			];
			$data['signature'] = $this->sign($data);
			$response = $this->api($this->status_url, $data);
			
			if (($response['response']['response_status'] ?? '') === 'success') {
				$json['success'] = $this->language->get('text_status_success');
				unset($response['response']['response_signature_string'], $response['response']['signature']);
				$json['data'] = $response['response'];
			} else {
				$err = $response['response']['error_message'] ?? 'Unknown Error';
				$json['error'] = sprintf($this->language->get('text_status_api_error'), $err);
			}
		} else {
			$json['error'] = $this->language->get('error_missing_params');
		}
		$this->response->addHeader('Content-Type: application/json');
		$this->response->setOutput(json_encode($json));
	}

	private function displayLastDayLog() {
		if (!$this->config->get('payment_hutko_save_logs')) return $this->language->get('text_logs_disabled');
		$file = DIR_LOGS . 'error.log';
		if (!file_exists($file)) return sprintf($this->language->get('text_log_file_not_found'), 'error.log');
		$lines = file($file);
		$output = [];
		for ($i = count($lines) - 1; $i >= 0 && count($output) < 50; $i--) {
			if (strpos($lines[$i], 'Hutko Payment') !== false) $output[] = htmlspecialchars($lines[$i], ENT_QUOTES, 'UTF-8');
		}
		return empty($output) ? $this->language->get('text_no_logs_found') : implode('<br>', $output);
	}
	
	// =========================================================================
	// SHARED LOGIC START
	// MAINTENANCE WARNING: The following functions (buildRequest, getProducts, 
	// sign, api, logOC) must remain identical in Admin and Catalog controllers.
	// =========================================================================

	private function buildRequest($order, $hutko_ref) {
		$products_data = $this->getProducts($order['order_id'], $order);
		
		$total_products_sum = 0;
		foreach ($products_data as $p) {
			$total_products_sum += $p['total_amount'];
		}

		$totals_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "order_total WHERE order_id = '" . (int)$order['order_id'] . "' ORDER BY sort_order ASC");
		$shipping_cost = 0;
		foreach ($totals_query->rows as $t) {
			if ($t['code'] == 'shipping') {
				$shipping_cost += $this->currency->format($t['value'], $order['currency_code'], $order['currency_value'], false);
			}
		}

		$order_total_val = $this->currency->format($order['total'], $order['currency_code'], $order['currency_value'], false);
		
		if ($this->config->get('payment_hutko_include_discount_to_total')) {
			$amount_val = $order_total_val;
			if (!$this->config->get('payment_hutko_shipping_include')) {
				$amount_val -= $shipping_cost;
			}
		} else {
			$amount_val = $total_products_sum;
		}

		if ($amount_val < 0.01) $amount_val = 0.01;
		$total_cents = (int)round($amount_val * 100);

		$catalog_url = defined('HTTP_CATALOG') ? HTTP_CATALOG : HTTP_SERVER;
		$catalog_url = rtrim($catalog_url, '/') . '/';

		$response_url = $catalog_url . 'index.php?route=checkout/success';
		$callback_url = $catalog_url . 'index.php?route=extension/hutko/payment/hutko.callback';

		$reservation_data = [
			"cms_name"         => "OpenCart",
			"cms_version"      => VERSION,
			"shop_domain"      => preg_replace("(^https?://)", "", $catalog_url),
			"phonemobile"      => $order['telephone'],
			"customer_address" => $order['payment_address_1'] . ' ' . $order['payment_address_2'],
			"customer_country" => $order['shipping_iso_code_2'],
			"customer_name"    => $order['firstname'] . ' ' . $order['lastname'],
			"customer_email"   => $order['email'],
			"products"         => $products_data
		];

		$data = [
			'order_id'            => $hutko_ref,
			'merchant_id'         => $this->config->get('payment_hutko_merchant_id'),
			'amount'              => $total_cents,
			'currency'            => $order['currency_code'],
			'order_desc'          => 'Order #' . $order['order_id'],
			'response_url'        => $response_url,
			'server_callback_url' => $callback_url,
			'sender_email'        => $order['email'],
			'reservation_data'    => base64_encode(json_encode($reservation_data))
		];
		
		$data['signature'] = $this->sign($data);
		return $data;
	}

	private function getProducts(int $order_id, array $order_info): array {
		$products_data = [];
		$query = $this->db->query("SELECT * FROM `" . DB_PREFIX . "order_product` WHERE `order_id` = '" . (int)$order_id . "'");

		foreach ($query->rows as $product) {
			$unit_price = $this->currency->format($product['price'] + $product['tax'], $order_info['currency_code'], $order_info['currency_value'], false);
			$total_price = $this->currency->format($product['total'] + ($product['tax'] * $product['quantity']), $order_info['currency_code'], $order_info['currency_value'], false);

			$products_data[] = [
				"id"           => $product['product_id'],
				"name"         => $product['name'] . ' ' . $product['model'],
				"price"        => round((float)$unit_price, 2),
				"total_amount" => round((float)$total_price, 2),
				"quantity"     => (int)$product['quantity'],
			];
		}

		if ($this->config->get('payment_hutko_shipping_include')) {
			$totals = $this->db->query("SELECT * FROM " . DB_PREFIX . "order_total WHERE order_id = '" . (int)$order_id . "' AND code = 'shipping'");
			if ($totals->num_rows) {
				$shipping_val = $this->currency->format($totals->row['value'], $order_info['currency_code'], $order_info['currency_value'], false);
				if ($shipping_val > 0) {
					$products_data[] = [
						"id"           => $this->config->get('payment_hutko_shipping_product_code') ?: 'SHIPPING',
						"name"         => $this->config->get('payment_hutko_shipping_product_name') ?: 'Shipping',
						"price"        => round((float)$shipping_val, 2),
						"total_amount" => round((float)$shipping_val, 2),
						"quantity"     => 1,
					];
				}
			}
		}
		return $products_data;
	}

	private function sign($data) {
		$key = $this->config->get('payment_hutko_secret_key');
		$arr = array_filter($data, function($v){ return $v !== '' && $v !== null; });
		ksort($arr);
		$str = $key;
		foreach($arr as $v) $str .= '|' . $v;
		return sha1($str);
	}

	private function api($url, $data) {
		if ($this->config->get('payment_hutko_save_logs')) $this->logOC('Req: ' . json_encode($data));

		$ch = curl_init($url);
		curl_setopt($ch, CURLOPT_POST, 1);
		curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode(['request' => $data]));
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
		curl_setopt($ch, CURLOPT_TIMEOUT, 30);
		
		$res = curl_exec($ch);
		$error = curl_error($ch);
		curl_close($ch);

		if ($this->config->get('payment_hutko_save_logs')) {
			$this->logOC('Res: ' . $res);
			if ($error) $this->logOC('Curl Error: ' . $error);
		}
		
		return json_decode($res, true) ?: [];
	}

	private function logOC($msg) {
		$this->log->write("Hutko Payment: " . $msg);
	}
	// =========================================================================
	// SHARED LOGIC END
	// =========================================================================
}