<?php
/**
 * AJAX Handlers
 *
 * All wp_ajax_ and wp_ajax_nopriv_ handlers live here.
 * Keep each handler focused and properly secured with nonce verification.
 */

// ─────────────────────────────────────────────────────────────────────────────
// Resource Tiles Block AJAX  (resource-tiles-block)
// ─────────────────────────────────────────────────────────────────────────────

add_action('wp_ajax_resource_ajax_action', 'sk_handle_resource_tiles_ajax');
add_action('wp_ajax_nopriv_resource_ajax_action', 'sk_handle_resource_tiles_ajax');

/**
 * Handle paginated AJAX requests for the simple resource-tiles-block.
 * Block sends: action, block_id, page_no, post_type, per_page, cta_text
 */
function sk_handle_resource_tiles_ajax()
{   
    // Added taxonomy and term_id NULL check for the resource_category listing pages
    // By default they will come NULL, on resource cat page there value comes
    $taxonomy = (!empty($_POST['taxonomy']) && $_POST['taxonomy'] !== 'null')
    ? sanitize_text_field($_POST['taxonomy'])
    : '';

    $term_id = (!empty($_POST['term_id']) && $_POST['term_id'] !== 'null')
    ? intval($_POST['term_id'])
    : '';
    $paged = isset($_POST['page_no']) ? max(1, intval($_POST['page_no'])) : 1;
    $per_page = isset($_POST['per_page']) ? max(1, min(100, intval($_POST['per_page']))) : 6;
    $type_label = isset($_POST['type_label']) ? sanitize_text_field($_POST['type_label']) : '';
    $cta_text = ( $_POST['cta_text'] !== 'null' && !empty($_POST['cta_text']) )  ? sanitize_text_field($_POST['cta_text']) : 'Read More';

    // post_type may be a plain string or a JSON array string (when ACF field is multi-select)
    $post_type_raw = isset($_POST['post_type']) ? wp_unslash($_POST['post_type']) : 'post';
    $decoded_type = json_decode($post_type_raw, true);

    if (is_array($decoded_type)) {
        $meta = sk_get_resource_metadata();
        $all_allowed = $meta['all_slugs'];

        // Validate each type against allowed list
        $post_type = array_values(array_filter($decoded_type, function ($t) use ($all_allowed) {
            return in_array(sanitize_key($t), $all_allowed, true);
        }));
        if (empty($post_type))
            $post_type = 'post';
    } else {
        $post_type = sanitize_text_field($post_type_raw);
    }

    require_once get_stylesheet_directory() . '/blocks/resource-tiles-block/query.php';
    require_once get_stylesheet_directory() . '/blocks/resource-tiles-block/template.php';

    $query = get_resource_query($post_type, $per_page, $paged, $taxonomy, $term_id);

    ob_start();
    if ($query->have_posts()) {
        while ($query->have_posts()) {
            $query->the_post();
            render_resource_card(get_the_ID(), $cta_text, $type_label, $taxonomy, $term_id);
        }
        wp_reset_postdata();
    }
    $cards = ob_get_clean();

    ob_start();
    render_resource_pagination($query->max_num_pages, $paged);
    $pagination = ob_get_clean();

    wp_send_json_success(array(
        'cards' => $cards,
        'pagination' => $pagination,
        'max_pages' => (int) $query->max_num_pages,
        'paged' => $paged,
    ));
}

// ─────────────────────────────────────────────────────────────────────────────
// All Resources With Filters Block AJAX  (all-resources-with-filters-block)
// ─────────────────────────────────────────────────────────────────────────────

add_action('wp_ajax_sk_filter_resources', 'sk_ajax_filter_resources');
add_action('wp_ajax_nopriv_sk_filter_resources', 'sk_ajax_filter_resources');

/**
 * Handle filter + paginate AJAX for the all-resources-with-filters-block.
 * Secured with a nonce. Block sends: nonce, type, category, paged, orderby,
 * order, per_page, block_types (JSON), cta_map (JSON).
 */
function sk_ajax_filter_resources()
{

    // 1. Nonce check
    if (!check_ajax_referer('sk_resource_filter', 'nonce', false)) {
        wp_send_json_error(array('message' => 'Security check failed.'), 403);
        wp_die();
    }

    // 2. Sanitize inputs & get metadata
    $meta = sk_get_resource_metadata();
    $all_allowed = $meta['all_slugs'];
    $type_label_map = $meta['labels'];
    $play_btn_types = $meta['play_buttons'];

    $type_raw = isset($_POST['type']) ? sanitize_text_field(wp_unslash($_POST['type'])) : 'initial';
    $category_raw = isset($_POST['category']) ? sanitize_text_field(wp_unslash($_POST['category'])) : 'initial';
    $paged = isset($_POST['paged']) ? max(1, (int) $_POST['paged']) : 1;
    $orderby = isset($_POST['orderby']) ? sanitize_key($_POST['orderby']) : 'date';
    $order = isset($_POST['order']) ? (strtoupper(sanitize_key($_POST['order'])) === 'ASC' ? 'ASC' : 'DESC') : 'DESC';
    $per_page = isset($_POST['per_page']) ? max(1, min(100, (int) $_POST['per_page'])) : 12;

    // 3. Build allowed post types (from block config)
    $block_types = array();
    $block_types_raw = isset($_POST['block_types']) ? sanitize_text_field(wp_unslash($_POST['block_types'])) : '';

    if (!empty($block_types_raw)) {
        $decoded = json_decode($block_types_raw, true);
        if (is_array($decoded)) {
            $block_types = array_values(
                array_filter($decoded, function ($t) use ($all_allowed) {
                    return in_array($t, $all_allowed, true);
                })
            );
        }
    }
    if (empty($block_types)) {
        $block_types = $all_allowed;
    }

    // Narrow to specific type if selected
    if ($type_raw !== 'initial' && in_array($type_raw, $block_types, true)) {
        $query_types = array($type_raw);
    } else {
        $query_types = $block_types;
    }

    // 4. Build WP_Query args
    $args = array(
        'post_type' => $query_types,
        'posts_per_page' => $per_page,
        'paged' => $paged,
        'post_status' => 'publish',
        'orderby' => $orderby,
        'order' => $order,
        'ignore_sticky_posts' => true,
    );

    if ($category_raw !== 'initial') {
        $args['tax_query'] = array(
            array(
                'taxonomy' => 'resource_category',
                'field' => 'slug',
                'terms' => $category_raw,
            ),
        );
    }

    // 5. Run query
    $query = new WP_Query($args);

    // 6. Decode CTA map from JS
    $cta_map = array();
    $cta_map_raw = isset($_POST['cta_map']) ? sanitize_text_field(wp_unslash($_POST['cta_map'])) : '';
    if (!empty($cta_map_raw)) {
        $decoded = json_decode($cta_map_raw, true);
        if (is_array($decoded)) {
            $cta_map = array_map('sanitize_text_field', $decoded);
        }
    }

    // 7. Render cards
    ob_start();

    if ($query->have_posts()):
        while ($query->have_posts()):
            $query->the_post();
            sk_render_all_resources_card(get_the_ID(), $type_label_map, $cta_map, $play_btn_types);
        endwhile;
        wp_reset_postdata();
    else:
        echo '<div class="no-posts-message"><p>No resources found matching your criteria.</p></div>';
    endif;

    $html = ob_get_clean();

    // 8. Return JSON
    wp_send_json_success(array(
        'html' => $html,
        'max_pages' => (int) $query->max_num_pages,
        'found' => (int) $query->found_posts,
        'paged' => $paged,
    ));

    wp_die();
}

// ─────────────────────────────────────────────────────────────────────────────
// Inline Script: Inject nonce + ajaxUrl for JS
// ─────────────────────────────────────────────────────────────────────────────

/**
 * Pass ajaxUrl and nonce to the frontend JS so filters/pagination work.
 */
function sk_enqueue_resource_filter_data()
{
    $data = array(
        'ajaxUrl' => admin_url('admin-ajax.php'),
        'nonce' => wp_create_nonce('sk_resource_filter'),
    );
    wp_register_script('sk-resource-filter-nonce', false, array(), null, true);
    wp_enqueue_script('sk-resource-filter-nonce');
    wp_add_inline_script(
        'sk-resource-filter-nonce',
        'var skResourceFilter = ' . wp_json_encode($data) . ';',
        'before'
    );
}
add_action('wp_enqueue_scripts', 'sk_enqueue_resource_filter_data');