<?php
/**
 * AluxPay Payment Gateway Class
 */

if (!defined('ABSPATH')) {
    exit;
}

class WC_Aluxpay_Payment_Gateway extends WC_Payment_Gateway {

    /**
     * Reusable: HTML notice for Thank You page + HTML emails
     */
    protected function get_generic_notice_html(): string {
        // Keep inline styles for email clients; translate strings
        $html .= '<p><strong>' . esc_html__( 'Thank you for your payment!', 'aluxpay-payment-gateway' ) . '</strong> ';
        $html .= esc_html__( 'Your order has been successfully processed, and a confirmation email has been sent from our webstore.', 'aluxpay-payment-gateway' ) . '</p>';

        $html .= '<h5>' . esc_html__( 'Important Note:', 'aluxpay-payment-gateway' ) . '</h5>';
        $html .= '<p>' . esc_html__( "Because of the nature of our business and how our website integrates with PayPal, you’ll also receive a PayPal payment confirmation email. That email will display a generic product name instead of the specific item(s) you purchased.", 'aluxpay-payment-gateway' ) . '</p>';

        $html .= '<p>' . esc_html__( 'Rest assured — your order is fully confirmed, and the webstore confirmation email contains the correct details of your purchase.', 'aluxpay-payment-gateway' ) . '</p>';

        $html .= '<p>' . esc_html__( "If you have any questions or need assistance, please don’t hesitate to contact our support team.", 'aluxpay-payment-gateway' ) . '</p>';

        // For frontend we can allow basic tags; for email we echo directly.
        $allowed = array(
            'p'   => array('style'=>true),
            'h5'  => array('style'=>true),
            'strong' => array(),
        );
        return wp_kses( $html, $allowed );
    }

    /**
     * Reusable: Plain-text version for plain emails
     */
    protected function get_generic_notice_plain(): string {
        $lines = array(
            __( 'Thank you for your payment! Your order has been successfully processed, and a confirmation email has been sent from our webstore.', 'aluxpay-payment-gateway' ),
            '',
            __( 'Important Note:', 'aluxpay-payment-gateway' ),
            __( "Because of the nature of our business and how our website integrates with PayPal, you’ll also receive a PayPal payment confirmation email. That email will display a generic product name instead of the specific item(s) you purchased.", 'aluxpay-payment-gateway' ),
            __( 'Rest assured — your order is fully confirmed, and the webstore confirmation email contains the correct details of your purchase.', 'aluxpay-payment-gateway' ),
            '',
            __( "If you have any questions or need assistance, please don’t hesitate to contact our support team.", 'aluxpay-payment-gateway' ),
        );
        return implode( PHP_EOL, $lines ) . PHP_EOL;
    }

    /**
     * Reusable: HTML notice for Failed Order emails
     */
    protected function get_failed_notice_html(): string {
        $html = '';
        $html .= '<p><strong>' . esc_html__( 'Payment Failed', 'aluxpay-payment-gateway' ) . '</strong></p>';
        $html .= '<p>' . esc_html__( 'Unfortunately, your payment could not be processed. This may have occurred for one of the following reasons:', 'aluxpay-payment-gateway' ) . '</p>';

        $html .= '<ul style="margin-left: 20px;">';
        $html .= '<li>' . esc_html__( 'Insufficient funds in your account', 'aluxpay-payment-gateway' ) . '</li>';
        $html .= '<li>' . esc_html__( 'Payment was cancelled during the process', 'aluxpay-payment-gateway' ) . '</li>';
        $html .= '<li>' . esc_html__( 'Payment method declined the transaction', 'aluxpay-payment-gateway' ) . '</li>';
        $html .= '<li>' . esc_html__( 'Technical issue during payment processing', 'aluxpay-payment-gateway' ) . '</li>';
        $html .= '</ul>';

        $html .= '<p>' . esc_html__( 'Your order has not been completed and no charges have been made to your account.', 'aluxpay-payment-gateway' ) . '</p>';

        $html .= '<h5>' . esc_html__( 'What to do next:', 'aluxpay-payment-gateway' ) . '</h5>';
        $html .= '<p>' . esc_html__( 'You can try placing your order again by visiting our website. If you continue to experience issues, please contact us for assistance.', 'aluxpay-payment-gateway' ) . '</p>';

        $html .= '<p>' . esc_html__( 'We apologize for any inconvenience this may have caused.', 'aluxpay-payment-gateway' ) . '</p>';

        $allowed = array(
            'p'   => array('style'=>true),
            'h5'  => array('style'=>true),
            'ul'  => array('style'=>true),
            'li'  => array(),
            'strong' => array(),
        );
        return wp_kses( $html, $allowed );
    }

    /**
     * Reusable: Plain-text version for Failed Order emails
     */
    protected function get_failed_notice_plain(): string {
        $lines = array(
            __( 'Payment Failed', 'aluxpay-payment-gateway' ),
            '',
            __( 'Unfortunately, your payment could not be processed. This may have occurred for one of the following reasons:', 'aluxpay-payment-gateway' ),
            '',
            '- ' . __( 'Insufficient funds in your account', 'aluxpay-payment-gateway' ),
            '- ' . __( 'Payment was cancelled during the process', 'aluxpay-payment-gateway' ),
            '- ' . __( 'Payment method declined the transaction', 'aluxpay-payment-gateway' ),
            '- ' . __( 'Technical issue during payment processing', 'aluxpay-payment-gateway' ),
            '',
            __( 'Your order has not been completed and no charges have been made to your account.', 'aluxpay-payment-gateway' ),
            '',
            __( 'What to do next:', 'aluxpay-payment-gateway' ),
            __( 'You can try placing your order again by visiting our website. If you continue to experience issues, please contact us for assistance.', 'aluxpay-payment-gateway' ),
            '',
            __( 'We apologize for any inconvenience this may have caused.', 'aluxpay-payment-gateway' ),
        );
        return implode( PHP_EOL, $lines ) . PHP_EOL;
    }


    /**
     * Constructor
     */
    public function __construct() {

        $this->id                 = 'aluxpay_payment_gateway';
        $this->icon               = ''; // URL to icon (optional)
        $this->method_title       = __('AluxPay Payment Gateway', 'aluxpay-payment-gateway');
        $this->method_description = __('Redirects customers to a standalone payment website for secure PayPal payments.', 'aluxpay-payment-gateway');
        $this->has_fields         = false;

        // Load the settings
        $this->init_form_fields();
        $this->init_settings();

        // Define user set variables
        $this->title              = $this->get_option('title');
        $this->description        = $this->get_option('description');
        $this->payment_url        = $this->get_option('payment_url');
        $this->enabled            = $this->get_option('enabled');
        $this->testmode           = 'yes' === $this->get_option('testmode');
        $this->debug              = 'yes' === $this->get_option('debug', 'no');

        // Logs
        if ($this->debug) {
            $this->log = wc_get_logger();
        }

        // Actions
        add_action('woocommerce_update_options_payment_gateways_' . $this->id, array($this, 'process_admin_options'));
        add_action('woocommerce_api_' . $this->id, array($this, 'webhook_handler'));
        add_action('woocommerce_thankyou_' . $this->id, array($this, 'thankyou_page'));

        // Customer Emails - Success
        add_action('woocommerce_email_before_order_table', array($this, 'email_instructions'), 10, 3);

        // Customer Emails - Failed Orders
        add_action('woocommerce_email_before_order_table', array($this, 'failed_email_instructions'), 10, 3);

    }

    /**
     * Initialize Gateway Settings Form Fields
     */
    public function init_form_fields() {

        $this->form_fields = array(
            'enabled' => array(
                'title'       => __('Enable/Disable', 'aluxpay-payment-gateway'),
                'label'       => __('Enable AluxPay Payment Gateway', 'aluxpay-payment-gateway'),
                'type'        => 'checkbox',
                'description' => '',
                'default'     => 'no'
            ),
            'title' => array(
                'title'       => __('Title', 'aluxpay-payment-gateway'),
                'type'        => 'text',
                'description' => __('This controls the title which the user sees during checkout.', 'aluxpay-payment-gateway'),
                'default'     => __(' PayPal or Credit/Debit Card Payment ', 'aluxpay-payment-gateway'),
                'desc_tip'    => true,
            ),
            'description' => array(
                'title'       => __('Description', 'aluxpay-payment-gateway'),
                'type'        => 'textarea',
                'description' => __('Payment method description that the customer will see on your checkout.', 'aluxpay-payment-gateway'),
                'default'     => __('You will be redirected to complete payment securely with PayPal or Credit Card.', 'aluxpay-payment-gateway'),
                'desc_tip'    => true,
            ),
            'payment_url' => array(
                'title'       => __('Payment Website URL', 'aluxpay-payment-gateway'),
                'type'        => 'text',
                'description' => __('The URL of your standalone payment website (e.g., https://payment.yoursite.com)', 'aluxpay-payment-gateway'),
                'default'     => 'http://localhost:5173/payment',
                'desc_tip'    => true,
            ),
            'testmode' => array(
                'title'       => __('Test mode', 'aluxpay-payment-gateway'),
                'label'       => __('Enable Test Mode', 'aluxpay-payment-gateway'),
                'type'        => 'checkbox',
                'description' => __('Place the payment gateway in test mode using test API keys.', 'aluxpay-payment-gateway'),
                'default'     => 'yes',
                'desc_tip'    => true,
            ),
            'debug' => array(
                'title'       => __('Debug log', 'aluxpay-payment-gateway'),
                'label'       => __('Enable logging', 'aluxpay-payment-gateway'),
                'type'        => 'checkbox',
                'description' => sprintf(__('Log events inside %s Note: this may log personal information. We recommend using this for debugging purposes only.', 'aluxpay-payment-gateway'), '<code>' . WC_Log_Handler_File::get_log_file_path($this->id) . '</code>'),
                'default'     => 'no',
            ),
        );
    }

    /**
     * Process the payment and return the result
     */
    public function process_payment($order_id) {

        $order = wc_get_order($order_id);

        if ($this->debug) {
            $this->log->info('Processing payment for order #' . $order_id, array('source' => $this->id));
        }

        // Mark as pending payment
        $order->update_status('pending', __('Awaiting payment via AluxPay Payment Gateway.', 'aluxpay-payment-gateway'));

        // Reduce stock levels
        wc_reduce_stock_levels($order_id);

        // Remove cart
        WC()->cart->empty_cart();

        // Build redirect URL with order parameters
        $redirect_url = $this->get_payment_redirect_url($order);

        if ($this->debug) {
            $this->log->info('Redirecting to: ' . $redirect_url, array('source' => $this->id));
        }

        // Return redirect
        return array(
            'result'   => 'success',
            'redirect' => $redirect_url
        );
    }

    /**
     * Build payment redirect URL
     */
    private function get_payment_redirect_url($order) {

        // Build description without special characters OR encode it
        $description = sprintf(
            __('Order %s from %s', 'aluxpay-payment-gateway'),
            $order->get_id(),
            get_bloginfo('name')
        );

        $params = array(
            'wc_order_id'    => $order->get_id(),
            'total'          => $order->get_total(),
            'currency'       => $order->get_currency(),
            'description'    => $description,
            'customer_email' => $order->get_billing_email(),
            'return_url'     => $this->get_return_url($order),
            'cancel_url'     => wc_get_checkout_url(),
            '_wpnonce'       => wp_create_nonce('cpg_payment_' . $order->get_id()),
        );

        // Add nonce for security
        $params['_wpnonce'] = wp_create_nonce('cpg_payment_' . $order->get_id());

        return add_query_arg($params, $this->payment_url);
    }

    /**
     * Webhook handler for payment updates
     */
    public function webhook_handler() {

        if ($this->debug) {
            $this->log->info('Webhook received', array('source' => $this->id));
        }

        // Get the raw POST data
        $raw_post = file_get_contents('php://input');
        $decoded  = json_decode($raw_post);

        if (!$decoded || !isset($decoded->order_id) || !isset($decoded->transaction_id)) {
            if ($this->debug) {
                $this->log->error('Invalid webhook data received', array('source' => $this->id));
            }
            status_header(400);
            die('Invalid data');
        }

        $order_id       = absint($decoded->order_id);
        $transaction_id = sanitize_text_field($decoded->transaction_id);
        $status         = sanitize_text_field($decoded->status);

        $order = wc_get_order($order_id);

        if (!$order) {
            if ($this->debug) {
                $this->log->error('Order not found: ' . $order_id, array('source' => $this->id));
            }
            status_header(404);
            die('Order not found');
        }

        // Process based on status
        if ($status === 'completed' || $status === 'COMPLETED') {

            // Payment complete
            $order->payment_complete($transaction_id);

            // Add order note
            $order->add_order_note(
                sprintf(__('Payment completed via AluxPay Payment Gateway. Transaction ID: %s', 'aluxpay-payment-gateway'), $transaction_id)
            );

            if ($this->debug) {
                $this->log->info('Payment completed for order #' . $order_id . ' Transaction ID: ' . $transaction_id, array('source' => $this->id));
            }

            status_header(200);
            die('Success');

        } else {

            // Payment failed
            $order->update_status('failed', __('Payment failed or was declined.', 'aluxpay-payment-gateway'));

            if ($this->debug) {
                $this->log->warning('Payment failed for order #' . $order_id, array('source' => $this->id));
            }

            status_header(200);
            die('Marked as failed');
        }
    }

    /**
     * Output for the order received page
     */
    public function thankyou_page($order_id) {

        /**if ($this->description) {
            echo wpautop(wptexturize($this->description));
        }*/

        $order = wc_get_order($order_id);

        if ($order && $order->get_status() === 'processing') {
            echo $this->get_generic_notice_html();
        }
    }

    /**
     * Add content to the WC emails for successful orders
     */
    public function email_instructions($order, $sent_to_admin, $plain_text = false) {

        /** if ($this->description && !$sent_to_admin && $this->id === $order->get_payment_method()) {
        *     echo wpautop(wptexturize($this->description)) . PHP_EOL;
        *} */

        if ( $sent_to_admin ) return; // customers only
        if ( ! $order instanceof WC_Order ) return;
        if ( $order->get_payment_method() !== $this->id ) return;

        // Only show for completed/processing orders
        if ( ! in_array( $order->get_status(), array( 'processing', 'completed' ) ) ) return;

        // Pick the right format for the email renderer
        if ( $plain_text ) {
            echo $this->get_generic_notice_plain();
        } else {
            echo $this->get_generic_notice_html();
        }
    }

    /**
     * Add content to the WC emails for failed orders
     */
    public function failed_email_instructions($order, $sent_to_admin, $plain_text = false) {

        if ( $sent_to_admin ) return; // customers only
        if ( ! $order instanceof WC_Order ) return;
        if ( $order->get_payment_method() !== $this->id ) return;

        // Only show for failed orders
        if ( $order->get_status() !== 'failed' ) return;

        // Pick the right format for the email renderer
        if ( $plain_text ) {
            echo $this->get_failed_notice_plain();
        } else {
            echo $this->get_failed_notice_html();
        }
    }
}