<?php
/**
 * Server-side rendering of the `core/archives` block.
 *
 * @package WordPress
 */

/**
 * Renders the `core/archives` block on server.
 *
 * @since 5.0.0
 *
 * @see WP_Widget_Archives
 *
 * @param array $attributes The block attributes.
 *
 * @return string Returns the post content with archives added.
 */
function render_block_core_archives( $attributes ) {
    $show_post_count = ! empty( $attributes['showPostCounts'] );
    $type            = $attributes['type'] ?? 'monthly';

    $class = 'wp-block-archives-list';

    if ( ! empty( $attributes['displayAsDropdown'] ) ) {

        $class = 'wp-block-archives-dropdown';

        $dropdown_id = wp_unique_id( 'wp-block-archives-' );
        $title       = __( 'Archives' );

        /** This filter is documented in wp-includes/widgets/class-wp-widget-archives.php */
        $dropdown_args = apply_filters(
            'widget_archives_dropdown_args',
            array(
                'type'            => $type,
                'format'          => 'option',
                'show_post_count' => $show_post_count,
            )
        );

        $dropdown_args['echo'] = 0;

        $archives = wp_get_archives( $dropdown_args );

        $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $class ) );

        switch ( $dropdown_args['type'] ) {
            case 'yearly':
                $label = __( 'Select Year' );
                break;
            case 'monthly':
                $label = __( 'Select Month' );
                break;
            case 'daily':
                $label = __( 'Select Day' );
                break;
            case 'weekly':
                $label = __( 'Select Week' );
                break;
            default:
                $label = __( 'Select Post' );
                break;
        }

        $show_label = empty( $attributes['showLabel'] ) ? ' screen-reader-text' : '';

        $block_content = '<label for="' . $dropdown_id . '" class="wp-block-archives__label' . $show_label . '">' . esc_html( $title ) . '</label>
        <select id="' . esc_attr( $dropdown_id ) . '" name="archive-dropdown">
        <option value="">' . esc_html( $label ) . '</option>' . $archives . '</select>';

        // Inject the dropdown script immediately after the select dropdown.
        $block_content .= block_core_archives_build_dropdown_script( $dropdown_id );

        return sprintf(
            '<div %1$s>%2$s</div>',
            $wrapper_attributes,
            $block_content
        );
    }

    /** This filter is documented in wp-includes/widgets/class-wp-widget-archives.php */
    $archives_args = apply_filters(
        'widget_archives_args',
        array(
            'type'            => $type,
            'show_post_count' => $show_post_count,
        )
    );

    $archives_args['echo'] = 0;

    $archives = wp_get_archives( $archives_args );

    $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $class ) );

    if ( empty( $archives ) ) {
        return sprintf(
            '<div %1$s>%2$s</div>',
            $wrapper_attributes,
            __( 'No archives to show.' )
        );
    }

    return sprintf(
        '<ul %1$s>%2$s</ul>',
        $wrapper_attributes,
        $archives
    );
}

/**
 * Generates the inline script for an archives dropdown field.
 *
 * @since 6.9.0
 *
 * @param string $dropdown_id ID of the dropdown field.
 *
 * @return string Returns the dropdown onChange redirection script.
 */
function block_core_archives_build_dropdown_script( $dropdown_id ) {
    ob_start();

    $exports = array( $dropdown_id, home_url() );
    ?>
    <script>
    ( ( [ dropdownId, homeUrl ] ) => {
        const dropdown = document.getElementById( dropdownId );
        function onSelectChange() {
            setTimeout( () => {
                if ( 'escape' === dropdown.dataset.lastkey ) {
                    return;
                }
                if ( dropdown.value ) {
                    location.href = dropdown.value;
                }
            }, 250 );
        }
        function onKeyUp( event ) {
            if ( 'Escape' === event.key ) {
                dropdown.dataset.lastkey = 'escape';
            } else {
                delete dropdown.dataset.lastkey;
            }
        }
        function onClick() {
            delete dropdown.dataset.lastkey;
        }
        dropdown.addEventListener( 'keyup', onKeyUp );
        dropdown.addEventListener( 'click', onClick );
        dropdown.addEventListener( 'change', onSelectChange );
    } )( <?php echo wp_json_encode( $exports, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ); ?> );
    </script>
    <?php
    return wp_get_inline_script_tag(
        trim( str_replace( array( '<script>', '</script>' ), '', ob_get_clean() ) ) .
        "\n//# sourceURL=" . rawurlencode( __FUNCTION__ )
    );
}

/**
 * Register archives block.
 *
 * @since 5.0.0
 */
function register_block_core_archives() {
    register_block_type_from_metadata(
        __DIR__ . '/archives',
        array(
            'render_callback' => 'render_block_core_archives',
        )
    );
}
add_action( 'init', 'register_block_core_archives' );