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

/**
* Build an array with CSS classes and inline styles defining the colors
* which will be applied to the pages markup in the front-end when it is a descendant of navigation.
*
* @since 5.8.0
*
* @param array $attributes Block attributes.
* @param array $context Navigation block context.
* @return array Colors CSS classes and inline styles.
*/
function block_core_page_list_build_css_colors( $attributes, $context ) {
$colors = array(
'css_classes' => array(),
'inline_styles' => '',
'overlay_css_classes' => array(),
'overlay_inline_styles' => '',
);

// Text color.
$has_named_text_color = array_key_exists( 'textColor', $context );
$has_picked_text_color = array_key_exists( 'customTextColor', $context );
$has_custom_text_color = isset( $context['style']['color']['text'] );

// If has text color.
if ( $has_custom_text_color || $has_picked_text_color || $has_named_text_color ) {
// Add has-text-color class.
$colors['css_classes'][] = 'has-text-color';
}

if ( $has_named_text_color ) {
// Add the color class.
$colors['css_classes'][] = sprintf( 'has-%s-color', _wp_to_kebab_case( $context['textColor'] ) );
} elseif ( $has_picked_text_color ) {
$colors['inline_styles'] .= sprintf( 'color: %s;', $context['customTextColor'] );
} elseif ( $has_custom_text_color ) {
// Add the custom color inline style.
$colors['inline_styles'] .= sprintf( 'color: %s;', $context['style']['color']['text'] );
}

// Background color.
$has_named_background_color = array_key_exists( 'backgroundColor', $context );
$has_picked_background_color = array_key_exists( 'customBackgroundColor', $context );
$has_custom_background_color = isset( $context['style']['color']['background'] );

// If has background color.
if ( $has_custom_background_color || $has_picked_background_color || $has_named_background_color ) {
// Add has-background class.
$colors['css_classes'][] = 'has-background';
}

if ( $has_named_background_color ) {
// Add the background-color class.
$colors['css_classes'][] = sprintf( 'has-%s-background-color', _wp_to_kebab_case( $context['backgroundColor'] ) );
} elseif ( $has_picked_background_color ) {
$colors['inline_styles'] .= sprintf( 'background-color: %s;', $context['customBackgroundColor'] );
} elseif ( $has_custom_background_color ) {
// Add the custom background-color inline style.
$colors['inline_styles'] .= sprintf( 'background-color: %s;', $context['style']['color']['background'] );
}

// Overlay text color.
$has_named_overlay_text_color = array_key_exists( 'overlayTextColor', $context );
$has_picked_overlay_text_color = array_key_exists( 'customOverlayTextColor', $context );

// If it has a text color.
if ( $has_named_overlay_text_color || $has_picked_overlay_text_color ) {
$colors['overlay_css_classes'][] = 'has-text-color';
}

// Give overlay colors priority, fall back to Navigation block colors, then global styles.
if ( $has_named_overlay_text_color ) {
$colors['overlay_css_classes'][] = sprintf( 'has-%s-color', _wp_to_kebab_case( $context['overlayTextColor'] ) );
} elseif ( $has_picked_overlay_text_color ) {
$colors['overlay_inline_styles'] .= sprintf( 'color: %s;', $context['customOverlayTextColor'] );
}

// Overlay background colors.
$has_named_overlay_background_color = array_key_exists( 'overlayBackgroundColor', $context );
$has_picked_overlay_background_color = array_key_exists( 'customOverlayBackgroundColor', $context );

// If has background color.
if ( $has_named_overlay_background_color || $has_picked_overlay_background_color ) {
$colors['overlay_css_classes'][] = 'has-background';
}

if ( $has_named_overlay_background_color ) {
$colors['overlay_css_classes'][] = sprintf( 'has-%s-background-color', _wp_to_kebab_case( $context['overlayBackgroundColor'] ) );
} elseif ( $has_picked_overlay_background_color ) {
$colors['overlay_inline_styles'] .= sprintf( 'background-color: %s;', $context['customOverlayBackgroundColor'] );
}

return $colors;
}

/**
* Build an array with CSS classes and inline styles defining the font sizes
* which will be applied to the pages markup in the front-end when it is a descendant of navigation.
*
* @since 5.8.0
*
* @param array $context Navigation block context.
* @return array Font size CSS classes and inline styles.
*/
function block_core_page_list_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;
}

/**
* Outputs Page list markup from an array of pages with nested children.
*
* @since 5.8.0
*
* @param boolean $open_submenus_on_click Whether to open submenus on click instead of hover.
* @param boolean $show_submenu_icons Whether to show submenu indicator icons.
* @param boolean $is_navigation_child If block is a child of Navigation block.
* @param array $nested_pages The array of nested pages.
* @param boolean $is_nested Whether the submenu is nested or not.
* @param array $active_page_ancestor_ids An array of ancestor ids for active page.
* @param array $colors Color information for overlay styles.
* @param integer $depth The nesting depth.
*
* @return string List markup.
*/
function block_core_page_list_render_nested_page_list( $open_submenus_on_click, $show_submenu_icons, $is_navigation_child, $nested_pages, $is_nested, $active_page_ancestor_ids = array(), $colors = array(), $depth = 0 ) {
if ( empty( $nested_pages ) ) {
return;
}
$front_page_id = (int) get_option( 'page_on_front' );
$markup = '';
foreach ( (array) $nested_pages as $page ) {
$css_class = $page['is_active'] ? ' current-menu-item' : '';
$aria_current = $page['is_active'] ? ' aria-current="page"' : '';
$style_attribute = '';

$css_class .= in_array( $page['page_id'], $active_page_ancestor_ids, true ) ? ' current-menu-ancestor' : '';
if ( isset( $page['children'] ) ) {
$css_class .= ' has-child';
}

if ( $is_navigation_child ) {
$css_class .= ' wp-block-navigation-item';

if ( $open_submenus_on_click ) {
$css_class .= ' open-on-click';
} elseif ( $show_submenu_icons ) {
$css_class .= ' open-on-hover-click';
}
}

$navigation_child_content_class = $is_navigation_child ? ' wp-block-navigation-item__content' : '';

// If this is the first level of submenus, include the overlay colors.
if ( ( ( 0 < $depth && ! $is_nested ) || $is_nested ) && isset( $colors['overlay_css_classes'], $colors['overlay_inline_styles'] ) ) {
$css_class .= ' ' . trim( implode( ' ', $colors['overlay_css_classes'] ) );
if ( '' !== $colors['overlay_inline_styles'] ) {
$style_attribute = sprintf( ' style="%s"', esc_attr( $colors['overlay_inline_styles'] ) );
}
}

if ( (int) $page['page_id'] === $front_page_id ) {
$css_class .= ' menu-item-home';
}

$title = wp_kses_post( $page['title'] );
$title = $title ? $title : __( '(no title)' );

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

$markup .= '<li class="wp-block-pages-list__item' . esc_attr( $css_class ) . '"' . $style_attribute . '>';

if ( isset( $page['children'] ) && $is_navigation_child && $open_submenus_on_click ) {
$markup .= '<button aria-label="' . esc_attr( $aria_label ) . '" class="' . esc_attr( $navigation_child_content_class ) . ' wp-block-navigation-submenu__toggle" aria-expanded="false">' . esc_html( $title ) .
'</button><span class="wp-block-page-list__submenu-icon wp-block-navigation__submenu-icon"><svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 12 12" fill="none" aria-hidden="true" focusable="false"><path d="M1.50002 4L6.00002 8L10.5 4" stroke-width="1.5"></path></svg></span>';
} else {
$markup .= '<a class="wp-block-pages-list__item__link' . esc_attr( $navigation_child_content_class ) . '" href="' . esc_url( $page['link'] ) . '"' . $aria_current . '>' . $title . '</a>';
}

if ( isset( $page['children'] ) ) {
if ( $is_navigation_child && $show_submenu_icons && ! $open_submenus_on_click ) {
$markup .= '<button aria-label="' . esc_attr( $aria_label ) . '" class="wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle" aria-expanded="false">';
$markup .= '<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 12 12" fill="none" aria-hidden="true" focusable="false"><path d="M1.50002 4L6.00002 8L10.5 4" stroke-width="1.5"></path></svg>';
$markup .= '</button>';
}
$markup .= '<ul class="wp-block-navigation__submenu-container">';
$markup .= block_core_page_list_render_nested_page_list( $open_submenus_on_click, $show_submenu_icons, $is_navigation_child, $page['children'], $is_nested, $active_page_ancestor_ids, $colors, $depth + 1 );
$markup .= '</ul>';
}
$markup .= '</li>';
}
return $markup;
}

/**
* Outputs nested array of pages
*
* @since 5.8.0
*
* @param array $current_level The level being iterated through.
* @param array $children The children grouped by parent post ID.
*
* @return array The nested array of pages.
*/
function block_core_page_list_nest_pages( $current_level, $children ) {
if ( empty( $current_level ) ) {
return;
}
foreach ( (array) $current_level as $key => $current ) {
if ( isset( $children[ $key ] ) ) {
$current_level[ $key ]['children'] = block_core_page_list_nest_pages( $children[ $key ], $children );
}
}
return $current_level;
}

/**
* Renders the `core/page-list` block on server.
*
* @since 5.8.0
*
* @param array $attributes The block attributes.
* @param string $content The saved content.
* @param WP_Block $block The parsed block.
*
* @return string Returns the page list markup.
*/
function render_block_core_page_list( $attributes, $content, $block ) {
static $block_id = 0;
++$block_id;

$parent_page_id = $attributes['parentPageID'];
$is_nested = $attributes['isNested'];

$all_pages = get_pages(
array(
'sort_column' => 'menu_order,post_title',
'order' => 'asc',
)
);

// If there are no pages, there is nothing to show.
if ( empty( $all_pages ) ) {
return;
}

$top_level_pages = array();

$pages_with_children = array();

$active_page_ancestor_ids = array();

foreach ( (array) $all_pages as $page ) {
$is_active = ! empty( $page->ID ) && ( get_queried_object_id() === $page->ID );

if ( $is_active ) {
$active_page_ancestor_ids = get_post_ancestors( $page->ID );
}

if ( $page->post_parent ) {
$pages_with_children[ $page->post_parent ][ $page->ID ] = array(
'page_id' => $page->ID,
'title' => $page->post_title,
'link' => get_permalink( $page ),
'is_active' => $is_active,
);
} else {
$top_level_pages[ $page->ID ] = array(
'page_id' => $page->ID,
'title' => $page->post_title,
'link' => get_permalink( $page ),
'is_active' => $is_active,
);

}
}

$colors = block_core_page_list_build_css_colors( $attributes, $block->context );
$font_sizes = block_core_page_list_build_css_font_sizes( $block->context );
$classes = array_merge(
$colors['css_classes'],
$font_sizes['css_classes']
);
$style_attribute = ( $colors['inline_styles'] . $font_sizes['inline_styles'] );
$css_classes = trim( implode( ' ', $classes ) );

$nested_pages = block_core_page_list_nest_pages( $top_level_pages, $pages_with_children );

if ( 0 !== $parent_page_id ) {
// If the parent page has no child pages, there is nothing to show.
if ( ! array_key_exists( $parent_page_id, $pages_with_children ) ) {
return;
}

$nested_pages = block_core_page_list_nest_pages(
$pages_with_children[ $parent_page_id ],
$pages_with_children
);
}

$is_navigation_child = array_key_exists( 'showSubmenuIcon', $block->context );

$open_submenus_on_click = array_key_exists( 'openSubmenusOnClick', $block->context ) ? $block->context['openSubmenusOnClick'] : false;

$show_submenu_icons = array_key_exists( 'showSubmenuIcon', $block->context ) ? $block->context['showSubmenuIcon'] : false;

$wrapper_markup = $is_nested ? '%2$s' : '<ul %1$s>%2$s</ul>';

$items_markup = block_core_page_list_render_nested_page_list( $open_submenus_on_click, $show_submenu_icons, $is_navigation_child, $nested_pages, $is_nested, $active_page_ancestor_ids, $colors );

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

return sprintf(
$wrapper_markup,
$wrapper_attributes,
$items_markup
);
}

/**
* Registers the `core/pages` block on server.
*
* @since 5.8.0
*/
function register_block_core_page_list() {
register_block_type_from_metadata(
__DIR__ . '/page-list',
array(
'render_callback' => 'render_block_core_page_list',
)
);
}
add_action( 'init', 'register_block_core_page_list' );