<?php
defined('ABSPATH') || exit;

class Redsys_API {
    
    private $environment;
    private $api_client;

    public function __construct() {
        require_once dirname(__FILE__) . '/apiRedsysFinal.php';
        require_once dirname(__FILE__) . '/RESTConstants.php';
        
        $this->api_client = new RedsysAPI();
        $this->environment = get_option('eb_redsys_test_mode') === 'yes' ? 'test' : 'live';
    }

    /**
     * Create merchant parameters
     */
    public function createMerchantParameters($params) {
        // Convert params to JSON
        $json = json_encode($params);
        
        // Encode in base64
        return $this->api_client->encodeBase64($json);
    }

    /**
     * Create merchant signature
     */
    public function createMerchantSignature($key, $data) {
        return $this->api_client->createMerchantSignature($key, $data);
    }

    /**
     * Decode merchant parameters
     */
    public function decodeMerchantParameters($data) {
        $decoded = $this->api_client->decodeBase64($data);
        return json_decode($decoded, true);
    }

    /**
     * Check signature
     */
    public function check_signature($merchant_parameters, $signature, $key) {
        $calculated_signature = $this->api_client->createMerchantSignatureNotif($key, $merchant_parameters);
        return $signature === $calculated_signature;
    }

    /**
     * Get endpoint URL
     */
    public function get_endpoint() {
        if ($this->environment === 'test') {
            return 'https://sis-t.redsys.es:25443/sis/realizarPago';
        } else {
            return 'https://sis.redsys.es/sis/realizarPago';
        }
    }

    /**
     * Create notification signature
     */
    public function createNotificationSignature($key, $data) {
        return $this->api_client->createMerchantSignatureNotif($key, $data);
    }

    /**
     * Format order number
     */
    public function formatOrderNumber($booking_id) {
        // Ensure order number is exactly 12 digits
        return str_pad($booking_id, 12, '0', STR_PAD_LEFT);
    }

    /**
     * Format amount
     */
    public function formatAmount($amount) {
        // Convert to cents and ensure no decimal places
        return number_format($amount * 100, 0, '', '');
    }

    /**
     * Create future payment parameters
     */
    public function createFuturePaymentParams($params, $execution_date) {
        $params['DS_MERCHANT_TRANSACTIONTYPE'] = 'L'; // Deferred payment
        $params['DS_MERCHANT_DATEFRECUENCY'] = '1'; // Daily frequency
        $params['DS_MERCHANT_CHARGEEXPIRYDATE'] = date('d/m/Y', strtotime($execution_date));
        
        return $params;
    }

    /**
     * Create subscription parameters
     */
    public function createSubscriptionParams($params) {
        $params['DS_MERCHANT_TRANSACTIONTYPE'] = 'L';
        $params['DS_MERCHANT_COF_INI'] = 'S'; // Initial recurring payment
        $params['DS_MERCHANT_COF_TYPE'] = 'R'; // Recurring payment type
        
        return $params;
    }

    /**
     * Create subsequent payment parameters
     */
    public function createSubsequentPaymentParams($params, $reference_id) {
        $params['DS_MERCHANT_TRANSACTIONTYPE'] = '0';
        $params['DS_MERCHANT_IDENTIFIER'] = $reference_id;
        $params['DS_MERCHANT_DIRECTPAYMENT'] = 'true';
        
        return $params;
    }

    /**
     * Parse notification response
     */
    public function parseNotification($data) {
        if (!isset($data['Ds_SignatureVersion']) || 
            !isset($data['Ds_MerchantParameters']) || 
            !isset($data['Ds_Signature'])) {
            return false;
        }

        $decoded_params = $this->decodeMerchantParameters($data['Ds_MerchantParameters']);
        
        return array(
            'params' => $decoded_params,
            'signature' => $data['Ds_Signature']
        );
    }

    /**
     * Validate response code
     */
    public function isSuccessResponse($response_code) {
        // Response codes less than 100 indicate success
        return $response_code < 100;
    }

    /**
     * Get response message
     */
    public function getResponseMessage($response_code) {
        $messages = array(
            '0000' => __('Transaction authorized for payments and pre-authorizations', 'eb-redsys-gateway'),
            '0900' => __('Transaction authorized for refunds and confirmations', 'eb-redsys-gateway'),
            '0101' => __('Card expired', 'eb-redsys-gateway'),
            '0102' => __('Card temporarily suspended or under suspicion of fraud', 'eb-redsys-gateway'),
            '0104' => __('Operation not allowed for this type of card', 'eb-redsys-gateway'),
            '0116' => __('Insufficient funds', 'eb-redsys-gateway'),
            '0118' => __('Card not registered', 'eb-redsys-gateway'),
            '0129' => __('Security code (CVV2/CVC2) incorrect', 'eb-redsys-gateway'),
            '0180' => __('Card not recognized', 'eb-redsys-gateway'),
            '0184' => __('Cardholder authentication failed', 'eb-redsys-gateway'),
            '0190' => __('Transaction declined without specific reason', 'eb-redsys-gateway'),
            '0191' => __('Wrong expiration date', 'eb-redsys-gateway'),
            '0904' => __('Merchant not registered at FUC', 'eb-redsys-gateway'),
            '0909' => __('System error', 'eb-redsys-gateway'),
            '0912' => __('Issuer not available', 'eb-redsys-gateway'),
            '0913' => __('Duplicate order', 'eb-redsys-gateway'),
            '0944' => __('Wrong session', 'eb-redsys-gateway'),
            '0950' => __('Refund operation not allowed', 'eb-redsys-gateway'),
        );

        return isset($messages[$response_code]) 
            ? $messages[$response_code] 
            : __('Unknown error', 'eb-redsys-gateway');
    }

    /**
     * Log error
     */
    public function log_error($message, $data = array()) {
        if (function_exists('eb_log')) {
            $log_message = 'Redsys API Error: ' . $message;
            if (!empty($data)) {
                $log_message .= ' | Data: ' . print_r($data, true);
            }
            eb_log($log_message);
        }
    }
}