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

/**
 * Renders the `core/calendar` block on server.
 *
 * @param array $attributes The block attributes.
 *
 * @return string Returns the block content.
 */
function render_block_core_calendar( $attributes ) {
    global $monthnum, $year;

    $previous_monthnum = $monthnum;
    $previous_year     = $year;

    if ( isset( $attributes['month'] ) && isset( $attributes['year'] ) ) {
        $permalink_structure = get_option( 'permalink_structure' );
        if (
            strpos( $permalink_structure, '%monthnum%' ) !== false &&
            strpos( $permalink_structure, '%year%' ) !== false
        ) {
            // phpcs:ignore WordPress.WP.GlobalVariablesOverride.OverrideProhibited
            $monthnum = $attributes['month'];
            // phpcs:ignore WordPress.WP.GlobalVariablesOverride.OverrideProhibited
            $year = $attributes['year'];
        }
    }

    $wrapper_attributes = get_block_wrapper_attributes();
    $output             = sprintf(
        '<div %1$s>%2$s</div>',
        $wrapper_attributes,
        get_calendar( true, false )
    );

    // phpcs:ignore WordPress.WP.GlobalVariablesOverride.OverrideProhibited
    $monthnum = $previous_monthnum;
    // phpcs:ignore WordPress.WP.GlobalVariablesOverride.OverrideProhibited
    $year = $previous_year;

    return $output;
}

/**
 * Registers the `core/calendar` block on server.
 */
function register_block_core_calendar() {
    register_block_type_from_metadata(
        __DIR__ . '/calendar',
        array(
            'render_callback' => 'render_block_core_calendar',
        )
    );
}

add_action( 'init', 'register_block_core_calendar' );