<?php

declare(strict_types=1);

namespace Yatra\PaymentGateways;

/**
 * Abstract Payment Gateway
 * Base class for all payment gateways
 */
abstract class AbstractPaymentGateway implements PaymentGatewayInterface
{
    protected string $id;
    protected string $title;
    protected string $description;
    protected string $icon = '';
    protected string $sandboxUrl = '';
    protected bool $isOffline = false;
    protected array $supports = [];
    protected array $config = [];

    public function __construct()
    {
        $this->loadConfig();
    }

    public function getId(): string
    {
        return $this->id;
    }

    public function getTitle(): string
    {
        return $this->title;
    }

    public function getDescription(): string
    {
        return $this->description;
    }

    public function getIcon(): string
    {
        // If icon is a relative path (starts with /), convert to full URL
        if (!empty($this->icon) && strpos($this->icon, 'http') !== 0) {
            // Priority 1: Check if icon is directly specified (e.g., 'paypal.svg', 'stripe.svg')
            if (strpos($this->icon, '.') !== false) {
                // Icon has extension, check in payment-gateways folder
                $iconPath = YATRA_PLUGIN_PATH . "assets/images/payment-gateways/{$this->icon}";
                if (file_exists($iconPath)) {
                    return YATRA_PLUGIN_URL . "assets/images/payment-gateways/{$this->icon}";
                }
            }
            
            // Priority 2: Try to derive icon name from gateway ID
            $iconName = $this->id;
            
          
            return YATRA_PLUGIN_URL . "assets/images/payment-gateways/{$iconName}.svg";
           
        }
        return $this->icon;
    }

    public function isOffline(): bool
    {
        return $this->isOffline;
    }

    public function getSandboxUrl(): string
    {
        return $this->sandboxUrl;
    }

    public function getSupports(): array
    {
        return $this->supports;
    }

    public function getConfig(): array
    {
        return $this->config;
    }

    /**
     * Load configuration from database
     */
    protected function loadConfig(): void
    {
        $allConfigs = get_option('yatra_gateway_configs', []);
        if (is_string($allConfigs)) {
            $allConfigs = maybe_unserialize($allConfigs);
        }
        $defaults = $this->getDefaultConfig();
        $stored = $allConfigs[$this->id] ?? null;
        if (!is_array($stored) || $stored === []) {
            $this->config = $defaults;

            return;
        }
        $this->config = array_merge($defaults, $stored);
    }

    /**
     * Get default configuration
     */
    protected function getDefaultConfig(): array
    {
        // PayLater gateway is enabled by default, others are disabled
        $defaults = ['enabled' => $this->id === 'pay_later'];
        foreach ($this->getConfigFields() as $field) {
            $defaults[$field['id']] = $field['default'] ?? '';
        }
        // Ensure 'enabled' is always present
        if (!isset($defaults['enabled'])) {
            $defaults['enabled'] = $this->id === 'pay_later';
        }
        return $defaults;
    }

    public function saveConfig(array $config): bool
    {
        $allConfigs = get_option('yatra_gateway_configs', []);
        if (is_string($allConfigs)) {
            $allConfigs = maybe_unserialize($allConfigs);
        }
        $allConfigs[$this->id] = array_merge($this->config, $config);
        return update_option('yatra_gateway_configs', $allConfigs);
    }

    public function isAvailable(): bool
    {
        return $this->isEnabled() && $this->isProperlyConfigured();
    }

    public function isProperlyConfigured(): bool
    {
        return true;
    }
    
    /**
     * Check if gateway is enabled in settings
     */
    public function isEnabled(): bool
    {
        return !empty($this->config['enabled'] ?? false);
    }

    /**
     * Get option key for this gateway
     */
    protected function getOptionKey(): string
    {
        return 'yatra_gateway_' . $this->id;
    }

    /**
     * Make HTTP request
     */
    protected function makeRequest(string $url, array $options = []): array
    {
        $response = wp_remote_request($url, $options);

        if (is_wp_error($response)) {
            return [
                'success' => false,
                'error' => $response->get_error_message(),
            ];
        }

        $body = wp_remote_retrieve_body($response);
        $code = wp_remote_retrieve_response_code($response);
        
        // Remove BOM (Byte Order Mark) that some APIs like Authorize.net return
        $body = preg_replace('/^\xEF\xBB\xBF/', '', $body);
        
        // Try to decode JSON
        $decoded = json_decode($body, true);

        return [
            'success' => $code >= 200 && $code < 300,
            'code' => $code,
            'body' => $decoded !== null ? $decoded : $body,
        ];
    }

    /**
     * Log gateway activity
     */
    protected function log(string $message, array $context = []): void
    {
        if (defined('WP_DEBUG') && WP_DEBUG) {
            }
    }

    // Default implementations that can be overridden
    public function handleWebhook(array $data): array
    {
        return ['success' => true];
    }

    public function processRefund(string $transactionId, float $amount): array
    {
        return [
            'success' => false,
            'error' => __('Refunds not supported by this gateway', 'yatra'),
        ];
    }

    /**
     * Check if gateway supports tokenization
     */
    public function supportsTokenization(): bool
    {
        return in_array('tokenization', $this->supports) || in_array('recurring', $this->supports);
    }

    /**
     * Check if gateway supports recurring payments
     */
    public function supportsRecurring(): bool
    {
        return in_array('recurring', $this->supports, true);
    }

    /**
     * Create a customer (default: not supported)
     */
    public function createCustomer(array $customerData): array
    {
        return [
            'success' => false,
            'error' => __('Customer creation not supported by this gateway', 'yatra'),
        ];
    }

    /**
     * Save payment method (default: not supported)
     */
    public function savePaymentMethod(string $customerId, array $paymentMethodData): array
    {
        return [
            'success' => false,
            'error' => __('Saving payment methods not supported by this gateway', 'yatra'),
        ];
    }

    /**
     * Charge saved payment method (default: not supported)
     */
    public function chargePaymentMethod(string $customerId, string $paymentMethodId, array $paymentData): array
    {
        return [
            'success' => false,
            'error' => __('Charging saved payment methods not supported by this gateway', 'yatra'),
        ];
    }

    /**
     * Delete payment method (default: not supported)
     */
    public function deletePaymentMethod(string $paymentMethodId): array
    {
        return [
            'success' => false,
            'error' => __('Deleting payment methods not supported by this gateway', 'yatra'),
        ];
    }

    /**
     * Get customer's payment methods (default: not supported)
     */
    public function getPaymentMethods(string $customerId): array
    {
        return [];
    }
}