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

class EB_Redsys_Settings {
    private $option_group = 'eb_redsys_settings';
    private $page_slug = 'eb-redsys-settings';

    public function __construct() {
        add_action('admin_menu', array($this, 'add_settings_page'));
        add_action('admin_init', array($this, 'register_settings'));
        add_action('admin_enqueue_scripts', array($this, 'enqueue_admin_scripts'));
        add_filter('eb_payment_methods', array($this, 'add_payment_method'));
    }

    /**
     * Add settings page to menu
     */
    public function add_settings_page() {
        if (!function_exists('eb_get_option')) {
            add_menu_page(
                __('Redsys Gateway', 'eb-redsys-gateway'),
                __('Redsys Gateway', 'eb-redsys-gateway'),
                'manage_options',
                $this->page_slug,
                array($this, 'render_settings_page'),
                'dashicons-money-alt',
                85
            );
        } else {
            add_submenu_page(
                'eb_bookings',
                __('Redsys Gateway', 'eb-redsys-gateway'),
                __('Redsys Gateway', 'eb-redsys-gateway'),
                'manage_options',
                $this->page_slug,
                array($this, 'render_settings_page')
            );
        }
    }

    /**
     * Register plugin settings
     */
    public function register_settings() {
        register_setting($this->option_group, 'eb_redsys_enabled', array('default' => 'yes'));
        register_setting($this->option_group, 'eb_redsys_test_mode', array('default' => 'yes'));
        register_setting($this->option_group, 'eb_redsys_merchant_code');
        register_setting($this->option_group, 'eb_redsys_terminal');
        register_setting($this->option_group, 'eb_redsys_encryption_key');
        register_setting($this->option_group, 'eb_redsys_title', array(
            'default' => __('Credit Card (Redsys)', 'eb-redsys-gateway')
        ));
        register_setting($this->option_group, 'eb_redsys_description', array(
            'default' => __('Pay securely via credit card using Redsys.', 'eb-redsys-gateway')
        ));
        register_setting($this->option_group, 'eb_redsys_enable_future_payments', array('default' => 'no'));
        register_setting($this->option_group, 'eb_redsys_enable_subscriptions', array('default' => 'no'));

        // Register sections and fields
        add_settings_section(
            'eb_redsys_general_section',
            __('General Settings', 'eb-redsys-gateway'),
            array($this, 'render_general_section'),
            $this->page_slug
        );

        add_settings_section(
            'eb_redsys_api_section',
            __('API Credentials', 'eb-redsys-gateway'),
            array($this, 'render_api_section'),
            $this->page_slug
        );

        add_settings_section(
            'eb_redsys_advanced_section',
            __('Advanced Settings', 'eb-redsys-gateway'),
            array($this, 'render_advanced_section'),
            $this->page_slug
        );

        // General Fields
        $this->add_field('enabled', 'checkbox', __('Enable/Disable', 'eb-redsys-gateway'), 'general');
        $this->add_field('test_mode', 'checkbox', __('Test Mode', 'eb-redsys-gateway'), 'general');
        $this->add_field('title', 'text', __('Title', 'eb-redsys-gateway'), 'general');
        $this->add_field('description', 'textarea', __('Description', 'eb-redsys-gateway'), 'general');

        // API Fields
        $this->add_field('merchant_code', 'text', __('Merchant Code (FUC)', 'eb-redsys-gateway'), 'api');
        $this->add_field('terminal', 'text', __('Terminal Number', 'eb-redsys-gateway'), 'api');
        $this->add_field('encryption_key', 'password', __('Encryption Key', 'eb-redsys-gateway'), 'api');

        // Advanced Fields
        $this->add_field('enable_future_payments', 'checkbox', __('Future Payments', 'eb-redsys-gateway'), 'advanced');
        $this->add_field('enable_subscriptions', 'checkbox', __('Subscriptions', 'eb-redsys-gateway'), 'advanced');
    }

    /**
     * Add field to settings
     */
    private function add_field($name, $type, $label, $section) {
        add_settings_field(
            'eb_redsys_' . $name,
            $label,
            array($this, 'render_field'),
            $this->page_slug,
            'eb_redsys_' . $section . '_section',
            array(
                'name' => 'eb_redsys_' . $name,
                'type' => $type,
                'label' => $label
            )
        );
    }

    /**
     * Render field based on type
     */
    public function render_field($args) {
        $name = $args['name'];
        $type = $args['type'];
        $value = get_option($name);

        switch ($type) {
            case 'checkbox':
                ?>
                <label>
                    <input type="checkbox" 
                           name="<?php echo esc_attr($name); ?>" 
                           value="yes" 
                           <?php checked($value, 'yes'); ?>>
                    <?php esc_html_e('Enable', 'eb-redsys-gateway'); ?>
                </label>
                <?php
                break;

            case 'text':
                ?>
                <input type="text" 
                       name="<?php echo esc_attr($name); ?>" 
                       value="<?php echo esc_attr($value); ?>" 
                       class="regular-text">
                <?php
                break;

            case 'password':
                ?>
                <input type="password" 
                       name="<?php echo esc_attr($name); ?>" 
                       value="<?php echo esc_attr($value); ?>" 
                       class="regular-text">
                <?php
                break;

            case 'textarea':
                ?>
                <textarea name="<?php echo esc_attr($name); ?>" 
                          class="large-text" 
                          rows="3"><?php echo esc_textarea($value); ?></textarea>
                <?php
                break;
        }
    }

    /**
     * Render section descriptions
     */
    public function render_general_section() {
        echo '<p>' . esc_html__('Configure how Redsys appears on your site.', 'eb-redsys-gateway') . '</p>';
    }

    public function render_api_section() {
        echo '<p>' . esc_html__('Enter your Redsys API credentials. You can find these in your Redsys merchant dashboard.', 'eb-redsys-gateway') . '</p>';
    }

    public function render_advanced_section() {
        echo '<p>' . esc_html__('Advanced settings for special payment scenarios.', 'eb-redsys-gateway') . '</p>';
    }

    /**
     * Add Redsys to Eagle Booking payment methods
     */
    public function add_payment_method($methods) {
        if (get_option('eb_redsys_enabled') === 'yes') {
            $methods['redsys'] = array(
                'title' => get_option('eb_redsys_title', __('Credit Card (Redsys)', 'eb-redsys-gateway')),
                'description' => get_option('eb_redsys_description'),
                'action_type' => 'redsys'
            );
        }
        return $methods;
    }

    /**
     * Enqueue admin scripts
     */
    public function enqueue_admin_scripts($hook) {
        if (strpos($hook, $this->page_slug) !== false) {
            wp_enqueue_style(
                'eb-redsys-admin',
                EB_REDSYS_URL . 'assets/css/admin.css',
                array(),
                EB_REDSYS_VERSION
            );
        }
    }

    /**
     * Render the settings page
     */
    public function render_settings_page() {
        if (!current_user_can('manage_options')) {
            return;
        }
        ?>
        <div class="wrap">
            <h1><?php echo esc_html(get_admin_page_title()); ?></h1>

            <?php
            if (isset($_GET['settings-updated'])) {
                add_settings_error(
                    'eb_redsys_messages',
                    'eb_redsys_message',
                    __('Settings Saved', 'eb-redsys-gateway'),
                    'updated'
                );
            }
            settings_errors('eb_redsys_messages');
            ?>

            <form action="options.php" method="post">
                <?php
                settings_fields($this->option_group);
                do_settings_sections($this->page_slug);
                submit_button();
                ?>
            </form>

            <div class="eb-redsys-info postbox">
                <h3 class="hndle"><?php esc_html_e('Important Information', 'eb-redsys-gateway'); ?></h3>
                <div class="inside">
                    <h4><?php esc_html_e('Test Mode', 'eb-redsys-gateway'); ?></h4>
                    <p><?php esc_html_e('For testing, use these credentials:', 'eb-redsys-gateway'); ?></p>
                    <ul>
                        <li><?php esc_html_e('Test Card: 4548 8120 4940 0004', 'eb-redsys-gateway'); ?></li>
                        <li><?php esc_html_e('Expiry Date: 12/24', 'eb-redsys-gateway'); ?></li>
                        <li><?php esc_html_e('CVV2: 123', 'eb-redsys-gateway'); ?></li>
                    </ul>

                    <h4><?php esc_html_e('Getting Started', 'eb-redsys-gateway'); ?></h4>
                    <p><?php esc_html_e('To get your credentials:', 'eb-redsys-gateway'); ?></p>
                    <ol>
                        <li><?php esc_html_e('Log in to your Redsys merchant account', 'eb-redsys-gateway'); ?></li>
                        <li><?php esc_html_e('Go to Administration → Technical Configuration', 'eb-redsys-gateway'); ?></li>
                        <li><?php esc_html_e('Find your Merchant Code (FUC) and Terminal number', 'eb-redsys-gateway'); ?></li>
                        <li><?php esc_html_e('Generate your Encryption Key in the Security section', 'eb-redsys-gateway'); ?></li>
                    </ol>

                    <h4><?php esc_html_e('Support', 'eb-redsys-gateway'); ?></h4>
                    <p>
                        <?php
                        printf(
                            /* translators: %s: URL */
                            esc_html__('For support, please visit our %s.', 'eb-redsys-gateway'),
                            '<a href="https://support.informatiq.com" target="_blank">' . esc_html__('support center', 'eb-redsys-gateway') . '</a>'
                        );
                        ?>
                    </p>
                </div>
            </div>
        </div>
        <?php
    }
}