<?php
if (! defined('ABSPATH')) exit;  // if direct access

class class_accordions_post_meta_product
{

    public function __construct()
    {

        //meta box action for "accordions"
        add_action('add_meta_boxes', array($this, '_post_meta_product'));
        add_action('save_post', array($this, '_post_meta_product_save'));
    }


    public function _post_meta_product($post_type)
    {

        add_meta_box('accordions_product_metabox', __('Product FAQ Tab', 'accordions'), array($this, 'meta_box_accordions_data'), 'product', 'side', 'high');
    }






    public function meta_box_accordions_data($post)
    {


        global $post;
        wp_nonce_field('meta_boxes_accordions_wc_input', 'meta_boxes_accordions_wc_input_nonce');


        $accordions_id = get_post_meta($post->ID, 'accordions_id', true);
        $accordions_tab_title = get_post_meta($post->ID, 'accordions_tab_title', true);

        //var_dump($accordions_id);
?>


        <select style="width: 100%;" id="accordions_id" name="accordions_id">
            <option>Select accordion</option>
            <?php if (!empty($accordions_id)): ?>
                <option value="<?php echo esc_attr($accordions_id); ?>" selected><?php echo esc_html(get_the_title($accordions_id)); ?></option>
            <?php endif; ?>
        </select>

        <span class="clear-faq-tab button">Clear</span>

        <p>
            <input style="width: 100%;" type="text" placeholder="Tab title" value="<?php echo esc_attr($accordions_tab_title); ?>" name="accordions_tab_title">
        </p>


        <script>
            (function($) {

                $(document).ready(function() {
                    $(document).on('click', ".clear-faq-tab", function() {
                        $('#accordions_id').select2('destroy').val('').select2();
                    })

                    //console.log(accordions_ajax.nonce);

                    $('#accordions_id').select2({
                        ajax: {
                            url: accordions_ajax.accordions_ajaxurl, // AJAX URL is predefined in WordPress admin
                            dataType: 'json',
                            delay: 250, // delay in ms while typing when to perform a AJAX search
                            data: function(params) {
                                return {
                                    q: params.term, // search query
                                    action: 'accordions_ajax_wc_get_accordions', // AJAX action for admin-ajax.php
                                    "nonce": accordions_ajax.nonce,
                                };
                            },
                            processResults: function(data) {
                                var options = [];
                                if (data) {

                                    // data is the array of arrays, and each of them contains ID and the Label of the option
                                    $.each(data, function(index, text) { // do not forget that "index" is just auto incremented value
                                        options.push({
                                            id: text[0],
                                            text: text[1]
                                        });
                                    });

                                }
                                return {
                                    results: options
                                };
                            },
                            cache: true
                        },
                        minimumInputLength: 3, // the minimum of symbols to input before perform a search
                        allowClear: true,
                    });
                })
            })(jQuery);
        </script>

<?php


    }



    public function _post_meta_product_save($post_id)
    {

        global $post;


        $active_plugins = get_option('active_plugins');

        if (!empty($post) && $post->post_type == 'product' && in_array('woocommerce/woocommerce.php', (array) $active_plugins)) {



            /*
             * We need to verify this came from the our screen and with proper authorization,
             * because save_post can be triggered at other times.
             */

            // Check if our nonce is set.
            if (! isset($_POST['meta_boxes_accordions_wc_input_nonce']))
                return $post_id;

            $nonce = sanitize_text_field(wp_unslash($_POST['meta_boxes_accordions_wc_input_nonce']));

            // Verify that the nonce is valid.
            if (! wp_verify_nonce($nonce, 'meta_boxes_accordions_wc_input'))
                return $post_id;

            // If this is an autosave, our form has not been submitted, so we don't want to do anything.
            if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)
                return $post_id;



            /* OK, its safe for us to save the data now. */

            // Sanitize user input.
            $accordions_id = isset($_POST['accordions_id']) ? sanitize_text_field(wp_unslash($_POST['accordions_id'])) : '';
            $accordions_tab_title = isset($_POST['accordions_tab_title']) ? sanitize_text_field(wp_unslash($_POST['accordions_tab_title'])) : '';

            update_post_meta($post_id, 'accordions_id', $accordions_id);
            update_post_meta($post_id, 'accordions_tab_title', $accordions_tab_title);
        }
    }
}


new class_accordions_post_meta_product();