<?php
/**
 * AKSRT Fixed Homepage Helpers
 *
 * Rebuilds the homepage around a fixed legacy-like skeleton instead of the
 * old freeform home modules canvas.
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

if (!function_exists('aksrt_is_fixed_homepage_request')) {
	/**
	 * Whether the current request should use the fixed homepage layout.
	 */
	function aksrt_is_fixed_homepage_request(): bool {
		if (is_admin()) {
			return false;
		}

		return is_front_page() || is_home();
	}
}

if (!function_exists('aksrt_homepage_get_current_page')) {
	/**
	 * Resolve the current homepage page number for both blog and static-front
	 * pagination contexts.
	 */
	function aksrt_homepage_get_current_page(): int {
		return max(1, (int) get_query_var('paged'), (int) get_query_var('page'));
	}
}

if (!function_exists('aksrt_homepage_get_post_types')) {
	/**
	 * Homepage latest feed post types.
	 * Resources are ordinary posts with meta — always post.
	 *
	 * @return string[]
	 */
	function aksrt_homepage_get_post_types(): array {
		return ['post'];
	}
}


if (!function_exists('aksrt_homepage_get_tab_terms')) {
	/**
	 * Homepage category tabs with full config.
	 *
	 * Returns enabled tabs in config order, each with 'term', 'title', 'orderby'.
	 * Preserves every configured row in the saved order.
	 *
	 * @return array<int, array{term:WP_Term, title:string, orderby:string, term_id:int}>
	 */
	function aksrt_homepage_get_tab_configs(): array {
		if (!class_exists('\AKSRT\Settings\Settings')) {
			return [];
		}

		$structured_tabs = \AKSRT\Settings\Settings::homepage_tabs();
		if (empty($structured_tabs)) {
			return [];
		}

		$excluded_cat_ids = array_flip(\AKSRT\Settings\Settings::home_exclude_category_ids());
		$configs = [];

		foreach ($structured_tabs as $tab) {
			if ($tab['term_id'] <= 0) {
				continue;
			}
			if (isset($excluded_cat_ids[$tab['term_id']])) {
				continue;
			}

			$term = get_term($tab['term_id']);
			if (!$term || is_wp_error($term)) {
				continue;
			}
			if ($term->taxonomy !== 'category') {
				continue;
			}

			$configs[] = [
				'term'    => $term,
				'term_id' => (int) $tab['term_id'],
				'title'   => $tab['title'] !== '' ? $tab['title'] : $term->name,
				'orderby' => $tab['orderby'] ?: 'modified',
			];
		}

		return $configs;
	}

	/**
	 * Homepage category tabs — returns WP_Term objects for backward compat.
	 *
	 * @param int $limit Unused, reads from settings.
	 * @return WP_Term[]
	 */
	function aksrt_homepage_get_tab_terms(int $limit = 4): array {
		$configs = aksrt_homepage_get_tab_configs();
		return array_column($configs, 'term');
	}
}

if (!function_exists('aksrt_homepage_get_tab_posts_per_page')) {
	/**
	 * Per-tab homepage post count.
	 */
	function aksrt_homepage_get_tab_posts_per_page(): int {
		if (class_exists('\AKSRT\Settings\Settings')) {
			$count = \AKSRT\Settings\Settings::homepage_tab_posts_per_page();
			if ($count > 0) {
				return max(1, min(20, $count));
			}
		}

		return 6;
	}
}

if (!function_exists('aksrt_homepage_sticky_tabs_enabled')) {
	/**
	 * Whether homepage tabs should stick below the primary nav.
	 */
	function aksrt_homepage_sticky_tabs_enabled(): bool {
		if (class_exists('\AKSRT\Settings\Settings')) {
			return \AKSRT\Settings\Settings::homepage_sticky_tabs_enabled();
		}

		return true;
	}
}

if (!function_exists('aksrt_homepage_get_sort_mode')) {
	/**
	 * Current homepage main-stream sort mode.
	 */
	function aksrt_homepage_get_sort_mode(): string {
		$allowed = class_exists('\AKSRT\Settings\Settings')
			? \AKSRT\Settings\Settings::homepage_allowed_sorts()
			: ['modified', 'date', 'views', 'like', 'comment_count', 'favorite', 'rand'];
		$default_sort = class_exists('\AKSRT\Settings\Settings')
			? \AKSRT\Settings\Settings::homepage_default_sort()
			: 'modified';
		$override_sort = get_query_var('aksrt_homepage_sort_override');
		$sort = is_string($override_sort) && $override_sort !== ''
			? sanitize_key($override_sort)
			: (isset($_GET['home_sort']) ? sanitize_key(wp_unslash((string) $_GET['home_sort'])) : $default_sort);

		return in_array($sort, $allowed, true) ? $sort : $default_sort;
	}
}

if (!function_exists('aksrt_homepage_get_sort_items')) {
	/**
	 * Configured sort bar items for the main stream.
	 *
	 * @return array<string,string>
	 */
	function aksrt_homepage_get_sort_items(): array {
		$all_labels = class_exists('\AKSRT\Settings\Settings')
			? \AKSRT\Settings\Settings::homepage_sort_labels()
			: [
				'modified' => '更新', 'date' => '发布', 'views' => '浏览',
				'like' => '点赞', 'comment_count' => '评论', 'favorite' => '收藏', 'rand' => '随机',
			];

		$enabled_keys = class_exists('\AKSRT\Settings\Settings')
			? \AKSRT\Settings\Settings::home_list_sort_options()
			: array_keys($all_labels);

		$items = [];
		foreach ($enabled_keys as $key) {
			if (isset($all_labels[$key])) {
				$items[$key] = $all_labels[$key];
			}
		}

		return !empty($items) ? $items : ['modified' => '更新', 'date' => '发布'];
	}
}

if (!function_exists('aksrt_homepage_apply_sort_args')) {
	/**
	 * Apply sort args to a query configuration.
	 */
	function aksrt_homepage_apply_sort_args(array $args): array {
		$sort_mode = aksrt_homepage_get_sort_mode();

		// Meta sorts: keep posts without the meta key via OR NOT EXISTS so lists never collapse empty.
		$apply_meta_sort = static function (array $args, string $meta_key): array {
			$args['meta_key'] = $meta_key;
			$args['orderby']  = [
				'meta_value_num' => 'DESC',
				'date'           => 'DESC',
			];
			$args['meta_query'] = [
				'relation' => 'OR',
				[
					'key'     => $meta_key,
					'compare' => 'EXISTS',
				],
				[
					'key'     => $meta_key,
					'compare' => 'NOT EXISTS',
				],
			];
			return $args;
		};

		switch ($sort_mode) {
			case 'modified':
				$args['orderby'] = 'modified';
				$args['order'] = 'DESC';
				break;
			case 'views':
				// Canonical public views key (align hotspot consumers later).
				$args = $apply_meta_sort($args, 'aksrt_post_views');
				break;
			case 'like':
				$args = $apply_meta_sort($args, '_aksrt_like_count');
				break;
			case 'favorite':
				$args = $apply_meta_sort($args, '_aksrt_favorite_count');
				break;
			case 'comment_count':
				$args['orderby'] = 'comment_count';
				$args['order'] = 'DESC';
				break;
			case 'rand':
				$args['orderby'] = 'rand';
				unset($args['order']);
				break;
			case 'date':
			default:
				$args['orderby'] = 'date';
				$args['order'] = 'DESC';
				break;
		}

		return $args;
	}
}

if (!function_exists('aksrt_homepage_apply_named_sort_args')) {
	/**
	 * Apply a specific named sort to query args (used by per-tab orderby).
	 */
	function aksrt_homepage_apply_named_sort_args(array $args, string $sort_mode): array {
		$allowed = class_exists('\AKSRT\Settings\Settings')
			? \AKSRT\Settings\Settings::homepage_allowed_sorts()
			: ['modified', 'date', 'views', 'like', 'comment_count', 'favorite', 'rand'];

		if (!in_array($sort_mode, $allowed, true)) {
			$sort_mode = 'modified';
		}

		$previous = get_query_var('aksrt_homepage_sort_override');
		set_query_var('aksrt_homepage_sort_override', $sort_mode);
		$result = aksrt_homepage_apply_sort_args($args);
		set_query_var('aksrt_homepage_sort_override', $previous);

		return $result;
	}
}

if (!function_exists('aksrt_homepage_render_sortbar')) {
	/**
	 * Render the main-stream sort bar.
	 */
	function aksrt_homepage_render_sortbar(): void {
		if (class_exists('\AKSRT\Settings\Settings') && !\AKSRT\Settings\Settings::home_list_sort_enabled()) {
			return;
		}

		$current = aksrt_homepage_get_sort_mode();
		$sort_ajax_enabled = class_exists('\AKSRT\Settings\Settings')
			? \AKSRT\Settings\Settings::homepage_sort_ajax_enabled()
			: true;
		$is_dropdown = class_exists('\AKSRT\Settings\Settings')
			? \AKSRT\Settings\Settings::home_list_sort_dropdown()
			: false;
		$base_url = remove_query_arg('home_sort', get_pagenum_link(aksrt_homepage_get_current_page()));
		$sort_items = aksrt_homepage_get_sort_items();
		$all_labels = class_exists('\AKSRT\Settings\Settings')
			? \AKSRT\Settings\Settings::homepage_sort_labels()
			: $sort_items;
		?>
		<div class="aksrt-homepage__sortbar" data-sort-ajax="<?php echo $sort_ajax_enabled ? 'true' : 'false'; ?>" aria-label="<?php esc_attr_e('Homepage Sort', 'aksrt'); ?>">
			<?php if ($is_dropdown) : ?>
				<div class="aksrt-homepage__sortbar-dropdown">
					<button type="button" class="aksrt-homepage__sortbar-current" data-sort-dropdown-trigger>
						<?php echo esc_html($all_labels[$current] ?? $current); ?>
						<i class="fa fas fa-caret-down" aria-hidden="true"></i>
					</button>
					<div class="aksrt-homepage__sortbar-dropdown-menu" hidden>
						<?php foreach ($sort_items as $sort_key => $label) : ?>
							<a
								class="aksrt-homepage__sortbar-dropdown-item<?php echo $sort_key === $current ? ' is-active' : ''; ?>"
								href="<?php echo esc_url(add_query_arg('home_sort', $sort_key, $base_url)); ?>"
								data-sort="<?php echo esc_attr($sort_key); ?>"
							>
								<?php echo esc_html($label); ?>
							</a>
						<?php endforeach; ?>
					</div>
				</div>
			<?php else : ?>
				<div class="aksrt-homepage__sortbar-links">
					<?php foreach ($sort_items as $sort_key => $label) : ?>
						<a
							class="aksrt-homepage__sortbar-link<?php echo $sort_key === $current ? ' is-active' : ''; ?>"
							href="<?php echo esc_url(add_query_arg('home_sort', $sort_key, $base_url)); ?>"
							data-sort="<?php echo esc_attr($sort_key); ?>"
						>
							<?php echo esc_html($label); ?>
						</a>
					<?php endforeach; ?>
				</div>
			<?php endif; ?>
		</div>
		<?php
	}
}