<?php

/**
 * Generate a unique term slug should user decide to copy same term more than once.
 * 
 * @param string $slug The initial slug to check
 * @param string $taxonomy The taxonomy to check against
 * @return string Unique slug
 */
function taxopress_get_unique_term_slug($slug, $taxonomy) {
    $original_slug = $slug;
    $count = 1;
    
    while (term_exists($slug, $taxonomy)) {
        $slug = $original_slug . '-' . $count;
        $count++;
    }
    
    return $slug;
}

/**
 * Handle the save and deletion of terms data.
 */
function taxopress_process_terms()
{

    if (wp_doing_ajax()) {
        return;
    }

    if (!is_admin()) {
        return;
    }

    if(!current_user_can('simple_tags')){
        return;
    }

    if (empty($_GET)) {
        return;
    }

    if (!isset($_GET['page'])) {
        return;
    }
    if ('st_terms' !== $_GET['page']) {
        return;
    }

    if (isset($_REQUEST['action']) && $_REQUEST['action'] === 'taxopress-delete-terms') {
        $nonce = sanitize_text_field($_REQUEST['_wpnonce']);
        if (wp_verify_nonce($nonce, 'terms-action-request-nonce')) {
            $term = get_term(sanitize_text_field($_REQUEST['taxopress_terms']));
            wp_delete_term( $term->term_id, $term->taxonomy );
        }
        add_action('admin_notices', "taxopress_term_delete_success_admin_notice");
        add_filter('removable_query_args', 'taxopress_delete_terms_filter_removable_query_args');
    }

    if (isset($_REQUEST['action']) && $_REQUEST['action'] === 'taxopress-remove-from-posts') {
        $nonce = sanitize_text_field($_REQUEST['_wpnonce']);
        if (wp_verify_nonce($nonce, 'terms-action-request-nonce')) {
            $term = get_term(sanitize_text_field($_REQUEST['taxopress_terms']));
            $args = array(
                'post_type' => 'any',
                'posts_per_page' => -1,
                'tax_query' => array(
                    array(
                        'taxonomy' => $term->taxonomy,
                        'field' => 'id',
                        'terms' => $term->term_id
                    )
                )
            );
            $posts = get_posts($args);
            $counter = 0;
            foreach ( $posts as $post ){
                $remove = wp_remove_object_terms( $post->ID, $term->term_id, $term->taxonomy );
                if($remove){
				    clean_object_term_cache( $post->ID, $term->taxonomy );
				    clean_term_cache( $term->term_id, $term->taxonomy );
                    $counter ++;
                }
            }

        }
        add_action('admin_notices', "taxopress_term_posts_remov_success_admin_notice");
        add_filter('removable_query_args', 'taxopress_delete_terms_filter_removable_query_args');
    }

    if (isset($_REQUEST['action']) && $_REQUEST['action'] === 'taxopress-copy-term') {
        $nonce = sanitize_text_field($_REQUEST['_wpnonce']);
        if (wp_verify_nonce($nonce, 'terms-action-request-nonce')) {
            $term = get_term(sanitize_text_field($_REQUEST['taxopress_terms']));

            $taxopress_term_name = $term->name . ' Copy';
            $base_slug = $term->slug . '-copy';
            $taxopress_term_slug = taxopress_get_unique_term_slug($base_slug, $term->taxonomy);
            $taxopress_term_data = wp_insert_term($taxopress_term_name, $term->taxonomy, [
                'slug' => $taxopress_term_slug,
                'description' => $term->description,
            ]);
    
            if (!is_wp_error($taxopress_term_data)) {
                $taxopress_term_id = $taxopress_term_data['term_id'];
    
                $args = array(
                    'post_type' => 'any',
                    'posts_per_page' => -1,
                    'tax_query' => array(
                        array(
                            'taxonomy' => $term->taxonomy,
                            'field' => 'id',
                            'terms' => $term->term_id
                        )
                    )
                );
                $posts = get_posts($args);
                
                foreach ( $posts as $post ){
                    wp_set_object_terms( $post->ID, $taxopress_term_id, $term->taxonomy, true );
                }
            }
        }
        add_action('admin_notices', "taxopress_term_copy_success_admin_notice");
        add_filter('removable_query_args', 'taxopress_delete_terms_filter_removable_query_args');
    }
}
add_action('admin_init', 'taxopress_process_terms', 8);

/**
 * Successful term copy callback.
 */
function taxopress_term_copy_success_admin_notice()
{
    // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
    echo taxopress_admin_notices_helper(esc_html__('Term copied successfully.', 'simple-tags'), true);
}

/**
 * Successful deleted callback.
 */
function taxopress_term_delete_success_admin_notice()
{
    // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
    echo taxopress_admin_notices_helper(esc_html__('Term deleted successfully.', 'simple-tags'), false);
}

/**
 * Successful remove term from posts callback.
 */
function taxopress_term_posts_remov_success_admin_notice()
{
    // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
    echo taxopress_admin_notices_helper(esc_html__('Term removed from all posts successfully.', 'simple-tags'), true);
}

/**
 * Filters the list of query arguments which get removed from admin area URLs in WordPress.
 *
 * @link https://core.trac.wordpress.org/ticket/23367
 *
 * @param string[] $args Array of removable query arguments.
 * @return string[] Updated array of removable query arguments.
 */
function taxopress_delete_terms_filter_removable_query_args(array $args)
{
    return array_merge($args, [
        'action',
        'taxopress_terms',
        '_wpnonce',
    ]);
}