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

/**
 * Returns the submenu visibility value with backward compatibility
 * for the deprecated openSubmenusOnClick attribute.
 *
 * This function centralizes the migration logic from the boolean
 * openSubmenusOnClick to the new submenuVisibility enum.
 *
 * Backward compatibility handling:
 * - Legacy blocks (saved before migration, never opened in editor):
 *   Have openSubmenusOnClick in database. Parent Navigation block passes it via context.
 *   We prioritize openSubmenusOnClick to preserve the original behavior.
 *
 * - Migrated blocks (opened in editor after migration):
 *   JavaScript deprecation removes openSubmenusOnClick and sets submenuVisibility.
 *   We use submenuVisibility since openSubmenusOnClick is null.
 *
 * - New blocks (created after migration):
 *   Only have submenuVisibility, openSubmenusOnClick is null.
 *   We use submenuVisibility.
 *
 * @since 6.9.0
 *
 * @param array $context Block context from parent Navigation block.
 * @return string The visibility mode: 'hover', 'click', or 'always'.
 */
function block_core_navigation_submenu_get_submenu_visibility( $context ) {
    $deprecated_open_submenus_on_click = $context['openSubmenusOnClick'] ?? null;

    // For backward compatibility, prioritize the legacy attribute if present. If it has been loaded and saved in the editor, then
    // the deprecated attribute will be replaced by submenuVisibility.
    if ( null !== $deprecated_open_submenus_on_click ) {
        // Convert boolean to string: true -> 'click', false -> 'hover'.
        return ! empty( $deprecated_open_submenus_on_click ) ? 'click' : 'hover';
    }

    $submenu_visibility = $context['submenuVisibility'] ?? null;

    // Use submenuVisibility for migrated/new blocks.
    return $submenu_visibility ?? 'hover';
}

// Path differs between source and build: '../navigation-link/shared/' in source, './navigation-link/shared/' in build.
if ( file_exists( __DIR__ . '/../navigation-link/shared/item-should-render.php' ) ) {
    require_once __DIR__ . '/../navigation-link/shared/item-should-render.php';
    require_once __DIR__ . '/../navigation-link/shared/render-submenu-icon.php';
} else {
    require_once __DIR__ . '/navigation-link/shared/item-should-render.php';
    require_once __DIR__ . '/navigation-link/shared/render-submenu-icon.php';
}

/**
 * Build an array with CSS classes and inline styles defining the font sizes
 * which will be applied to the navigation markup in the front-end.
 *
 * @since 5.9.0
 *
 * @param  array $context Navigation block context.
 * @return array Font size CSS classes and inline styles.
 */
function block_core_navigation_submenu_build_css_font_sizes( $context ) {
    // CSS classes.
    $font_sizes = array(
        'css_classes'   => array(),
        'inline_styles' => '',
    );

    $has_named_font_size  = array_key_exists( 'fontSize', $context );
    $has_custom_font_size = isset( $context['style']['typography']['fontSize'] );

    if ( $has_named_font_size ) {
        // Add the font size class.
        $font_sizes['css_classes'][] = sprintf( 'has-%s-font-size', $context['fontSize'] );
    } elseif ( $has_custom_font_size ) {
        // Add the custom font size inline style.
        $font_sizes['inline_styles'] = sprintf(
            'font-size: %s;',
            wp_get_typography_font_size_value(
                array(
                    'size' => $context['style']['typography']['fontSize'],
                )
            )
        );
    }

    return $font_sizes;
}

/**
 * Renders the `core/navigation-submenu` block.
 *
 * @since 5.9.0
 *
 * @param array    $attributes The block attributes.
 * @param string   $content    The saved content.
 * @param WP_Block $block      The parsed block.
 *
 * @return string Returns the post content with the legacy widget added.
 */
function render_block_core_navigation_submenu( $attributes, $content, $block ) {
    // Check if this navigation item should render based on post status.
    if ( defined( 'IS_GUTENBERG_PLUGIN' ) && IS_GUTENBERG_PLUGIN ) {
        if ( ! gutenberg_block_core_shared_navigation_item_should_render( $attributes, $block ) ) {
            return '';
        }
    }

    // Don't render the block's subtree if it has no label.
    if ( empty( $attributes['label'] ) ) {
        return '';
    }

    $font_sizes      = block_core_navigation_submenu_build_css_font_sizes( $block->context );
    $style_attribute = $font_sizes['inline_styles'];

    // Render inner blocks first to check if any menu items will actually display.
    $inner_blocks_html = '';
    foreach ( $block->inner_blocks as $inner_block ) {
        $inner_blocks_html .= $inner_block->render();
    }
    $has_submenu = ! empty( trim( $inner_blocks_html ) );

    $kind      = empty( $attributes['kind'] ) ? 'post_type' : str_replace( '-', '_', $attributes['kind'] );
    $is_active = ! empty( $attributes['id'] ) && get_queried_object_id() === (int) $attributes['id'] && ! empty( get_queried_object()->$kind );

    if ( is_post_type_archive() && ! empty( $attributes['url'] ) ) {
        $queried_archive_link = get_post_type_archive_link( get_queried_object()->name );
        if ( $attributes['url'] === $queried_archive_link ) {
            $is_active = true;
        }
    }

    $show_submenu_indicators = isset( $block->context['showSubmenuIcon'] ) && $block->context['showSubmenuIcon'];
    $computed_visibility     = block_core_navigation_submenu_get_submenu_visibility( $block->context );
    $open_on_click           = 'click' === $computed_visibility;
    $open_on_hover           = 'hover' === $computed_visibility;
    $open_on_hover_and_click = $open_on_hover && $show_submenu_indicators;

    $classes = array(
        'wp-block-navigation-item',
    );
    $classes = array_merge(
        $classes,
        $font_sizes['css_classes']
    );
    if ( $has_submenu ) {
        $classes[] = 'has-child';
    }
    if ( $open_on_click ) {
        $classes[] = 'open-on-click';
    }
    if ( $open_on_hover_and_click ) {
        $classes[] = 'open-on-hover-click';
    }
    if ( 'always' === $computed_visibility ) {
        $classes[] = 'open-always';
    }
    if ( $is_active ) {
        $classes[] = 'current-menu-item';
    }

    $wrapper_attributes = get_block_wrapper_attributes(
        array(
            'class' => implode( ' ', $classes ),
            'style' => $style_attribute,
        )
    );

    $label = '';

    if ( isset( $attributes['label'] ) ) {
        $label .= wp_kses_post( $attributes['label'] );
    }

    $aria_label = sprintf(
        /* translators: Accessibility text. %s: Parent page title. */
        __( '%s submenu' ),
        wp_strip_all_tags( $label )
    );

    $html = '<li ' . $wrapper_attributes . '>';

    // If Submenus open on hover or are always open, we render an anchor tag with attributes.
    // If submenu icons are set to show, we also render a submenu button, so the submenu can be opened on click.
    if ( ! $open_on_click ) {
        $item_url = $attributes['url'] ?? '';
        // Start appending HTML attributes to anchor tag.
        $html .= '<a class="wp-block-navigation-item__content"';

        // The href attribute on a and area elements is not required;
        // when those elements do not have href attributes they do not create hyperlinks.
        // But also The href attribute must have a value that is a valid URL potentially
        // surrounded by spaces.
        // see: https://html.spec.whatwg.org/multipage/links.html#links-created-by-a-and-area-elements.
        if ( ! empty( $item_url ) ) {
            $html .= ' href="' . esc_url( $item_url ) . '"';
        }

        if ( $is_active ) {
            $html .= ' aria-current="page"';
        }

        if ( isset( $attributes['opensInNewTab'] ) && true === $attributes['opensInNewTab'] ) {
            $html .= ' target="_blank"  ';
        }

        if ( isset( $attributes['rel'] ) ) {
            $html .= ' rel="' . esc_attr( $attributes['rel'] ) . '"';
        } elseif ( isset( $attributes['nofollow'] ) && $attributes['nofollow'] ) {
            $html .= ' rel="nofollow"';
        }

        if ( isset( $attributes['title'] ) ) {
            $html .= ' title="' . esc_attr( $attributes['title'] ) . '"';
        }

        $html .= '>';
        // End appending HTML attributes to anchor tag.

        $html .= '<span class="wp-block-navigation-item__label">';
        $html .= $label;
        $html .= '</span>';

        // Add description if available.
        if ( ! empty( $attributes['description'] ) ) {
            $html .= '<span class="wp-block-navigation-item__description">';
            $html .= wp_kses_post( $attributes['description'] );
            $html .= '</span>';
        }

        $html .= '</a>';
        // End anchor tag content.

        if ( $show_submenu_indicators && $has_submenu ) {
            // The submenu icon is rendered in a button here
            // so that there's a clickable element to open the submenu.
            $html .= '<button aria-label="' . esc_attr( $aria_label ) . '" class="wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle" aria-expanded="false">' . block_core_navigation_render_submenu_icon() . '</button>';
        }
    } else {
        $html .= '<button aria-label="' . esc_attr( $aria_label ) . '" class="wp-block-navigation-item__content wp-block-navigation-submenu__toggle" aria-expanded="false">';

        // Wrap title with span to isolate it from submenu icon.
        $html .= '<span class="wp-block-navigation-item__label">';

        $html .= $label;

        $html .= '</span>';

        // Add description if available.
        if ( ! empty( $attributes['description'] ) ) {
            $html .= '<span class="wp-block-navigation-item__description">';
            $html .= wp_kses_post( $attributes['description'] );
            $html .= '</span>';
        }

        $html .= '</button>';

        if ( $has_submenu ) {
            $html .= '<span class="wp-block-navigation__submenu-icon">' . block_core_navigation_render_submenu_icon() . '</span>';
        }
    }

    if ( $has_submenu ) {
        // Copy some attributes from the parent block to this one.
        // Ideally this would happen in the client when the block is created.
        if ( array_key_exists( 'overlayTextColor', $block->context ) ) {
            $attributes['textColor'] = $block->context['overlayTextColor'];
        }
        if ( array_key_exists( 'overlayBackgroundColor', $block->context ) ) {
            $attributes['backgroundColor'] = $block->context['overlayBackgroundColor'];
        }
        if ( array_key_exists( 'customOverlayTextColor', $block->context ) ) {
            $attributes['style']['color']['text'] = $block->context['customOverlayTextColor'];
        }
        if ( array_key_exists( 'customOverlayBackgroundColor', $block->context ) ) {
            $attributes['style']['color']['background'] = $block->context['customOverlayBackgroundColor'];
        }

        // This allows us to be able to get a response from wp_apply_colors_support.
        $block->block_type->supports['color'] = true;
        $colors_supports                      = wp_apply_colors_support( $block->block_type, $attributes );
        $css_classes                          = 'wp-block-navigation__submenu-container';
        if ( array_key_exists( 'class', $colors_supports ) ) {
            $css_classes .= ' ' . $colors_supports['class'];
        }

        $style_attribute = '';
        if ( array_key_exists( 'style', $colors_supports ) ) {
            $style_attribute = $colors_supports['style'];
        }

        if ( strpos( $inner_blocks_html, 'current-menu-item' ) ) {
            $tag_processor = new WP_HTML_Tag_Processor( $html );
            while ( $tag_processor->next_tag( array( 'class_name' => 'wp-block-navigation-item' ) ) ) {
                $tag_processor->add_class( 'current-menu-ancestor' );
            }
            $html = $tag_processor->get_updated_html();
        }

        $wrapper_attributes = get_block_wrapper_attributes(
            array(
                'class' => $css_classes,
                'style' => $style_attribute,
            )
        );

        $html .= sprintf(
            '<ul %s>%s</ul>',
            $wrapper_attributes,
            $inner_blocks_html
        );

    }

    $html .= '</li>';

    return $html;
}

/**
 * Register the navigation submenu block.
 *
 * @since 5.9.0
 *
 * @uses render_block_core_navigation_submenu()
 * @throws WP_Error An WP_Error exception parsing the block definition.
 */
function register_block_core_navigation_submenu() {
    register_block_type_from_metadata(
        __DIR__ . '/navigation-submenu',
        array(
            'render_callback' => 'render_block_core_navigation_submenu',
        )
    );
}
add_action( 'init', 'register_block_core_navigation_submenu' );