<?php

namespace AKSRT\WidgetSystem;

defined('ABSPATH') || exit;

/** Canonical 40 static areas plus five opt-in areas for each page. */
final class WidgetAreas {
	private const PAGE_CACHE_KEY = 'aksrt_widget_pages_v1';

	/** @return array<string, array{0:string,1:string,2:string}> */
	public static function definitions(): array {
		$areas = [
			'all_top_fluid'       => ['所有页面 - 顶部全宽', '显示在所有知识内容页面顶部。', 'fluid'],
			'all_bottom_fluid'    => ['所有页面 - 底部全宽', '显示在所有知识内容页面底部。', 'fluid'],
			'all_sidebar_top'     => ['所有页面 - 侧栏顶部', '显示在页面侧栏最上方。', 'sidebar'],
			'all_sidebar_bottom'  => ['所有页面 - 侧栏底部', '显示在页面侧栏最下方。', 'sidebar'],
		];
		$page_names = [
			'home'   => '首页',
			'single' => '文章页',
			'cat'    => '分类页',
			'tag'    => '标签页',
			'search' => '搜索页',
		];
		$positions = [
			'top_fluid'      => ['顶部全宽', 'fluid'],
			'top_content'    => ['主内容上面', 'content'],
			'bottom_content' => ['主内容下面', 'content'],
			'bottom_fluid'   => ['底部全宽', 'fluid'],
			'sidebar'        => ['侧边栏', 'sidebar'],
		];
		foreach ($page_names as $prefix => $page_name) {
			foreach ($positions as $suffix => [$position, $kind]) {
				$areas[$prefix . '_' . $suffix] = [
					$page_name . ' - ' . $position,
					sprintf('显示在%s的%s位置。', $page_name, $position),
					$kind,
				];
			}
		}
		foreach (['author' => '作者页', 'msg' => '消息中心'] as $prefix => $page_name) {
			$areas[$prefix . '_top_fluid'] = [$page_name . ' - 顶部全宽', '显示在' . $page_name . '内容顶部。', 'fluid'];
			$areas[$prefix . '_bottom_fluid'] = [$page_name . ' - 底部全宽', '显示在' . $page_name . '内容底部。', 'fluid'];
		}
		$areas['user_top_fluid'] = ['用户中心 - 顶部全宽', '显示在用户中心内容顶部。', 'fluid'];
		$areas['user_top_content'] = ['用户中心 - 内容区上面', '显示在用户中心主内容上面。', 'content'];
		$areas['user_bottom_fluid'] = ['用户中心 - 底部全宽', '显示在用户中心内容底部。', 'fluid'];
		$areas['newposts_sidebar_top'] = ['前台投稿 - 侧栏顶部', '显示在前台投稿侧栏顶部，并在移动端保留。', 'sidebar'];
		$areas['newposts_sidebar_bottom'] = ['前台投稿 - 侧栏底部', '显示在前台投稿侧栏底部，并在移动端保留。', 'sidebar'];
		$areas['all_footer'] = ['页脚内部', '显示在站点页脚内部。', 'content'];
		$areas['mobile_nav_fluid'] = ['移动菜单 - 底部', '显示在移动端抽屉菜单底部。', 'sidebar'];
		return $areas;
	}

	/** @return string[] */
	public static function static_ids(): array {
		return array_keys(self::definitions());
	}

	public static function register(): void {
		foreach (self::definitions() as $id => [$name, $description, $kind]) {
			self::register_area($id, $name, $description, $kind);
		}
		self::register_page_areas();
	}

	public static function render(string $id, string $class = ''): bool {
		if (!is_active_sidebar($id)) {
			return false;
		}
		$class = trim('aksrt-widget-area aksrt-widget-area--' . sanitize_html_class($id) . ' ' . $class);
		echo '<div class="' . esc_attr($class) . '" data-widget-area="' . esc_attr($id) . '">';
		dynamic_sidebar($id);
		echo '</div>';
		return true;
	}

	public static function flush_page_cache(): void {
		wp_cache_delete(self::PAGE_CACHE_KEY, 'aksrt');
	}

	private static function register_page_areas(): void {
		$page_ids = wp_cache_get(self::PAGE_CACHE_KEY, 'aksrt');
		if (!is_array($page_ids)) {
			$page_ids = get_posts([
				'post_type'              => 'page',
				'post_status'            => 'publish',
				'posts_per_page'         => -1,
				'fields'                 => 'ids',
				'orderby'                => 'date',
				'order'                  => 'ASC',
				'no_found_rows'          => true,
				'update_post_meta_cache' => false,
				'update_post_term_cache' => false,
				'meta_query'             => [
					[
						'key'   => 'widgets_register',
						'value' => '1',
					],
				],
			]);
			$page_ids = array_map('absint', $page_ids);
			wp_cache_set(self::PAGE_CACHE_KEY, $page_ids, 'aksrt');
		}

		$positions = [
			'sidebar'        => ['侧边栏', 'sidebar'],
			'top_fluid'      => ['顶部全宽', 'fluid'],
			'top_content'    => ['主内容上面', 'content'],
			'bottom_content' => ['主内容下面', 'content'],
			'bottom_fluid'   => ['底部全宽', 'fluid'],
		];
		foreach ($page_ids as $page_id) {
			$enabled = get_post_meta($page_id, 'widgets_register_container', true);
			if (!is_array($enabled)) {
				continue;
			}
			$title = wp_html_excerpt(get_the_title($page_id), 12, '…');
			foreach (array_values(array_unique(array_map('sanitize_key', $enabled))) as $position) {
				if (!isset($positions[$position])) {
					continue;
				}
				[$label, $kind] = $positions[$position];
				self::register_area(
					'page_' . $position . '_' . $page_id,
					sprintf('[页面：%1$s] - %2$s', $title, $label),
					sprintf('显示在页面“%1$s”的%2$s位置。', $title, $label),
					$kind
				);
			}
		}
	}

	private static function register_area(string $id, string $name, string $description, string $kind): void {
		register_sidebar([
			'id'            => $id,
			'name'          => __($name, 'aksrt'),
			'description'   => __($description, 'aksrt'),
			'before_widget' => '<section id="%1$s" class="aksrt-widget-shell aksrt-widget-shell--' . esc_attr($kind) . ' %2$s">',
			'after_widget'  => '</section>',
			'before_title'  => '<h3 class="aksrt-widget-shell__title">',
			'after_title'   => '</h3>',
		]);
	}
}