<?php
/**
 * @package AKSRT
 */

namespace AKSRT\Widgets;


defined('ABSPATH') || exit;

/**
 * Homepage content widgets aligned to the fixed Zibll-like layout.
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

if (!function_exists('aksrt_home_widget_allowed_layouts')) {
	/**
	 * Allowed post-card layouts for homepage content widgets.
	 *
	 * @return array<string, string>
	 */
	function aksrt_home_widget_allowed_layouts(): array {
		return [
			'card'     => __('卡片', 'aksrt'),
			'list'     => __('列表', 'aksrt'),
			'grid-cms' => __('资源网格', 'aksrt'),
		];
	}
}

if (!function_exists('aksrt_home_widget_post_types')) {
	/**
	 * Post types used by homepage widgets.
	 *
	 * @return array<int, string>
	 */
	function aksrt_home_widget_post_types(): array {
		return ['post'];
	}
}

if (!function_exists('aksrt_home_widget_available_categories')) {
	/**
	 * Return categories for widget admin forms.
	 *
	 * @return array<int, \WP_Term>
	 */
	function aksrt_home_widget_available_categories(): array {
		$categories = get_categories([
			'taxonomy'   => 'category',
			'hide_empty' => false,
			'orderby'    => 'name',
			'order'      => 'ASC',
		]);

		return is_array($categories) ? $categories : [];
	}
}

if (!function_exists('aksrt_home_widget_fallback_category_ids')) {
	/**
	 * Pick top categories as fallback when widget instance has no selection.
	 *
	 * @param int $limit Maximum category ids to return.
	 * @return array<int, int>
	 */
	function aksrt_home_widget_fallback_category_ids(int $limit = 1): array {
		$limit = max(1, min(8, $limit));
		$terms = get_terms([
			'taxonomy'   => 'category',
			'orderby'    => 'count',
			'order'      => 'DESC',
			'number'     => $limit,
			'hide_empty' => true,
			'fields'     => 'ids',
		]);

		if (is_wp_error($terms) || !is_array($terms)) {
			return [];
		}

		return array_values(array_filter(array_map('absint', $terms)));
	}
}

if (!function_exists('aksrt_home_widget_normalize_category_ids')) {
	/**
	 * Normalize selected category ids.
	 *
	 * @param mixed $raw_ids Raw ids from widget instance.
	 * @param int   $limit   Maximum ids to keep.
	 * @return array<int, int>
	 */
	function aksrt_home_widget_normalize_category_ids($raw_ids, int $limit = 4): array {
		$ids = array_map('absint', (array) $raw_ids);
		$ids = array_values(array_filter($ids, static fn($id) => $id > 0));

		if ($limit > 0) {
			$ids = array_slice($ids, 0, $limit);
		}

		return $ids;
	}
}

if (!function_exists('aksrt_home_widget_resolve_layout')) {
	/**
	 * Sanitize requested widget post layout.
	 *
	 * @param mixed  $layout Layout value.
	 * @param string $default Default layout.
	 * @return string
	 */
	function aksrt_home_widget_resolve_layout($layout, string $default = 'card'): string {
		$allowed = array_keys(aksrt_home_widget_allowed_layouts());
		$layout  = is_string($layout) ? $layout : $default;

		return in_array($layout, $allowed, true) ? $layout : $default;
	}
}

if (!function_exists('aksrt_home_widget_resolve_context')) {
	/**
	 * Resolve widget area context from sidebar args.
	 */
	function aksrt_home_widget_resolve_context(array $args): string {
		if (function_exists('aksrt_widget_get_area_context')) {
			return aksrt_widget_get_area_context($args);
		}

		return 'homepage';
	}
}

if (!function_exists('aksrt_home_widget_effective_layout')) {
	/**
	 * Compact rich homepage widgets when placed into a sidebar area.
	 */
	function aksrt_home_widget_effective_layout(string $layout, string $context): string {
		if ($context === 'sidebar' && $layout !== 'list') {
			return 'list';
		}

		return $layout;
	}
}

if (!function_exists('aksrt_home_widget_effective_columns')) {
	/**
	 * Sidebar widgets should stay single-column.
	 */
	function aksrt_home_widget_effective_columns(int $columns, string $context): int {
		if ($context === 'sidebar') {
			return 1;
		}

		return max(1, min(4, $columns));
	}
}

if (!function_exists('aksrt_home_widget_render_header')) {
	/**
	 * Render a compact Zibll-like section header.
	 *
	 * @param string $title Section title.
	 * @param string $more_link Optional more link.
	 * @param string $more_text Optional more text.
	 * @return void
	 */
	function aksrt_home_widget_render_header(string $title, string $more_link = '', string $more_text = ''): void {
		?>
		<header class="aksrt-home-widget__header">
			<h3 class="aksrt-home-widget__title"><?php echo esc_html($title); ?></h3>
			<?php if ($more_link !== '') : ?>
				<a class="aksrt-home-widget__more" href="<?php echo esc_url($more_link); ?>">
					<?php echo esc_html($more_text !== '' ? $more_text : __('查看更多', 'aksrt')); ?>
				</a>
			<?php endif; ?>
		</header>
		<?php
	}
}

if (!function_exists('aksrt_home_widget_render_post_grid')) {
	/**
	 * Render posts for homepage widgets.
	 *
	 * Delegates to the unified shared renderer (aksrt_render_post_list).
	 *
	 * @param \WP_Query $query Posts query.
	 * @param string   $layout Card layout.
	 * @param int      $columns Desktop columns.
	 * @param string   $context Sidebar or homepage context.
	 * @return void
	 */
	function aksrt_home_widget_render_post_grid(\WP_Query $query, string $layout = 'card', int $columns = 3, string $context = 'homepage'): void {
		if (!$query->have_posts()) {
			echo function_exists('aksrt_get_widget_null') ? aksrt_get_widget_null(__('暂无内容', 'aksrt')) : '<p class="widget-empty">' . esc_html__('暂无内容', 'aksrt') . '</p>';
			wp_reset_postdata();
			return;
		}

		if ($context === 'sidebar') {
			$use_homepage_mini = function_exists('aksrt_is_fixed_homepage_request')
				&& aksrt_is_fixed_homepage_request()
				&& function_exists('aksrt_render_mini_list')
				&& (!class_exists('\AKSRT\Settings\Settings') || \AKSRT\Settings\Settings::homepage_sidebar_mini_enabled());

			if ($use_homepage_mini && function_exists('aksrt_render_mini_list')) {
				echo '<div class="widget-tab-posts__list widget-tab-posts__list--mini aksrt-home-widget__sidebar-list">';
				aksrt_render_mini_list($query, ['context' => 'sidebar', 'show_thumb' => true]);
				echo '</div>';
				return;
			}

			// Fallback: shared mini list (lazy thumbs + meta).
			if (function_exists('aksrt_render_mini_list')) {
				echo '<div class="widget-tab-posts__list widget-tab-posts__list--mini aksrt-home-widget__sidebar-list">';
				aksrt_render_mini_list($query, ['context' => 'sidebar', 'show_thumb' => true]);
				echo '</div>';
				return;
			}
			echo '<ul class="widget-tab-posts__list aksrt-home-widget__sidebar-list">';
			$ph = get_template_directory_uri() . '/assets/img/placeholder.svg';
			while ($query->have_posts()) {
				$query->the_post();
				$thumb = get_the_post_thumbnail_url(get_the_ID(), 'thumbnail');
				echo '<li class="widget-tab-posts__item">';
				if ($thumb) {
					echo '<a href="' . esc_url(get_permalink()) . '" class="widget-tab-posts__thumb"><img class="fit-cover aksrt-lazy lazyload" data-src="' . esc_url($thumb) . '" src="' . esc_url($ph) . '" alt="" loading="lazy" /></a>';
				}
				echo '<div class="widget-tab-posts__info">';
				echo '<a href="' . esc_url(get_permalink()) . '" class="widget-tab-posts__title">' . esc_html(get_the_title()) . '</a>';
				echo '<span class="widget-tab-posts__meta">' . esc_html(human_time_diff(get_the_time('U'), current_time('timestamp')) . __('前', 'aksrt')) . '</span>';
				echo '</div></li>';
			}
			echo '</ul>';
			wp_reset_postdata();
			return;
		}

		// Homepage / content area: delegate to shared renderer
		$layout  = aksrt_home_widget_resolve_layout($layout, 'card');
		$columns = max(1, min(4, $columns));

		if (function_exists('aksrt_render_post_list')) {
			aksrt_render_post_list($query, [
				'mode'     => $layout === 'grid-cms' ? 'grid-cms' : $layout,
				'context'  => 'widget',
				'columns'  => $columns,
			], true);
		} else {
			// Fallback: use template part
			$previous_layout = get_query_var('aksrt_post_card_layout', '');
			$previous_scene  = get_query_var('aksrt_post_card_scene', '');

			set_query_var('aksrt_post_card_layout', $layout);
			set_query_var('aksrt_post_card_scene', 'home');

			$classes = [
				'aksrt-home-widget__post-grid',
				'aksrt-home-widget__post-grid--' . $layout,
				'post-grid',
				'post-grid--' . $layout,
			];

			printf(
				'<div class="%1$s" style="--aksrt-widget-columns:%2$d;">',
				esc_attr(implode(' ', $classes)),
				(int) $columns
			);

			while ($query->have_posts()) {
				$query->the_post();
				get_template_part('templates/parts/content', 'post-card');
			}

			echo '</div>';

			set_query_var('aksrt_post_card_layout', $previous_layout);
			set_query_var('aksrt_post_card_scene', $previous_scene);
		}

		wp_reset_postdata();
	}
}

if (!function_exists('aksrt_home_widget_get_lazyload_args')) {
	/**
	 * Lazyload settings reused by category recommend widget.
	 *
	 * @return array{enabled: bool, placeholder_url: string}
	 */
	function aksrt_home_widget_get_lazyload_args(): array {
		$config = class_exists('\AKSRT\Settings\Settings')
			? \AKSRT\Settings\Settings::get_lazyload_config()
			: ['enabled' => false, 'placeholder_url' => ''];

		return [
			'enabled'         => ! empty($config['enabled']),
			'placeholder_url' => ! empty($config['placeholder_url'])
				? (string) $config['placeholder_url']
				: get_template_directory_uri() . '/assets/img/placeholder.svg',
		];
	}
}

/**
 * Homepage category block widget.
 */
class CategoryBlockWidget extends \WP_Widget {


	public function __construct() {
		parent::__construct(
			'aksrt_category_block',
			esc_html__('AKSRT 分类块', 'aksrt'),
			[
				'classname'                   => 'widget_aksrt_category_block',
				'description'                 => esc_html__('指定分类的最新内容区块，可挂载到首页内容挂载区。', 'aksrt'),
				'customize_selective_refresh' => true,
			]
		);
	}

	/**
	 * @return array{html:string,paginate_html:string,has_more:bool,page:int,max_pages:int,total:int}
	 */
	public static function query_payload(array $instance, int $page = 1, string $context = 'homepage'): array {
		$page        = max(1, $page);
		$category_id = self::resolve_category_id_static($instance);
		$count       = max(1, min(12, (int) ($instance['count'] ?? 6)));
		$columns     = aksrt_home_widget_effective_columns((int) ($instance['columns'] ?? 3), $context);
		$layout      = aksrt_home_widget_effective_layout(
			aksrt_home_widget_resolve_layout($instance['layout'] ?? 'card', 'card'),
			$context
		);
		$paginate = sanitize_key((string) ($instance['paginate'] ?? 'none'));
		if (!in_array($paginate, ['ajax', 'none', 'number'], true)) {
			$paginate = 'none';
		}

		$query_args = [
			'post_type'           => aksrt_home_widget_post_types(),
			'post_status'         => 'publish',
			'posts_per_page'      => $count,
			'paged'               => $page,
			'ignore_sticky_posts' => true,
		];
		if ($paginate === 'none') {
			$query_args['no_found_rows'] = true;
		}
		if ($category_id > 0) {
			$query_args['cat'] = $category_id;
		}

		$query = new \WP_Query($query_args);
		ob_start();
		aksrt_home_widget_render_post_grid($query, $layout, $columns, $context);
		$html = (string) ob_get_clean();
		if ($html === '' && $page === 1) {
			$html = function_exists('aksrt_get_widget_null')
				? aksrt_get_widget_null(__('暂无内容', 'aksrt'))
				: '<p class="widget-empty ajax-item">' . esc_html__('暂无内容', 'aksrt') . '</p>';
		}

		$max_pages = max(1, (int) $query->max_num_pages);
		$total     = (int) $query->found_posts;
		$has_more  = in_array($paginate, ['ajax', 'number'], true) && $page < $max_pages;
		$base_qs = [
			'count'    => $count,
			'cat'      => $category_id,
			'columns'  => $columns,
			'layout'   => $layout,
			'context'  => $context,
			'paginate' => $paginate,
		];
		$rest_base = add_query_arg($base_qs, rest_url('aksrt/v1/widgets/category-block'));
		$paginate_html = '';
		if ($paginate === 'ajax' && $has_more) {
			$next = add_query_arg(['page' => $page + 1], $rest_base);
			$paginate_html = function_exists('aksrt_get_ajax_next_paginate')
				? aksrt_get_ajax_next_paginate($total, $page, $count, $next)
				: '<div class="text-center theme-pagination ajax-pag"><div class="next-page ajax-next"><a href="' . esc_url($next) . '">' . esc_html__('加载更多', 'aksrt') . '</a></div></div>';
		} elseif ($paginate === 'number' && $max_pages > 1) {
			$paginate_html = function_exists('aksrt_get_ajax_number_paginate')
				? aksrt_get_ajax_number_paginate($total, $page, $count, $rest_base)
				: '<div class="ajax-pag hide"><div class="next-page ajax-next"><a href="#"></a></div></div>';
		} else {
			$paginate_html = '<div class="ajax-pag hide"><div class="next-page ajax-next"><a href="#"></a></div></div>';
		}

		return compact('html', 'paginate_html', 'has_more', 'page', 'max_pages', 'total');
	}

	public function widget($args, $instance): void {
		$context     = aksrt_home_widget_resolve_context($args);
		$category_id = self::resolve_category_id_static($instance);
		$term        = $category_id > 0 ? get_term($category_id, 'category') : null;
		$title       = apply_filters('widget_title', $instance['title'] ?? '', $instance, $this->id_base);
		$title       = $title !== '' ? $title : (($term && ! is_wp_error($term)) ? $term->name : __('精选分类', 'aksrt'));
		$show_more   = ! empty($instance['show_more']);
		$paginate    = sanitize_key((string) ($instance['paginate'] ?? 'none'));
		if (!in_array($paginate, ['ajax', 'none', 'number'], true)) {
			$paginate = 'none';
		}
		$instance['paginate'] = $paginate;

		$payload = self::query_payload($instance, 1, $context);

		echo $args['before_widget'];
		echo '<section class="aksrt-home-widget aksrt-home-widget--category-block">';

		aksrt_home_widget_render_header(
			(string) $title,
			($show_more && $term && ! is_wp_error($term)) ? (string) get_category_link($category_id) : '',
			__('查看分类', 'aksrt')
		);

		$rest = rest_url('aksrt/v1/widgets/category-block');
		echo '<div class="ajaxpager aksrt-home-widget__ajax" data-aksrt-ajaxpager data-aksrt-ajax-url="' . esc_url($rest) . '">';
		echo $payload['html']; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
		echo $payload['paginate_html']; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
		echo '<div class="post_ajax_loader" data-aksrt-ajax-loader data-aksrt-ajax-loader-hide hidden></div>';
		echo '</div>';

		echo '</section>';
		echo $args['after_widget'];
	}

	public function form($instance): void {
		$title       = (string) ($instance['title'] ?? '');
		$category_id = (int) ($instance['category_id'] ?? 0);
		$count       = (int) ($instance['count'] ?? 6);
		$columns     = (int) ($instance['columns'] ?? 3);
		$layout      = aksrt_home_widget_resolve_layout($instance['layout'] ?? 'card', 'card');
		$show_more   = ! empty($instance['show_more']);
		$categories  = aksrt_home_widget_available_categories();
		?>
		<p>
			<label for="<?php echo esc_attr($this->get_field_id('title')); ?>"><?php esc_html_e('标题：', 'aksrt'); ?></label>
			<input class="widefat" id="<?php echo esc_attr($this->get_field_id('title')); ?>" name="<?php echo esc_attr($this->get_field_name('title')); ?>" type="text" value="<?php echo esc_attr($title); ?>">
		</p>
		<p>
			<label for="<?php echo esc_attr($this->get_field_id('category_id')); ?>"><?php esc_html_e('分类：', 'aksrt'); ?></label>
			<select class="widefat" id="<?php echo esc_attr($this->get_field_id('category_id')); ?>" name="<?php echo esc_attr($this->get_field_name('category_id')); ?>">
				<option value="0"><?php esc_html_e('自动选择最热门分类', 'aksrt'); ?></option>
				<?php foreach ($categories as $category) : ?>
					<option value="<?php echo (int) $category->term_id; ?>" <?php selected($category_id, (int) $category->term_id); ?>>
						<?php echo esc_html($category->name); ?>
					</option>
				<?php endforeach; ?>
			</select>
		</p>
		<p>
			<label for="<?php echo esc_attr($this->get_field_id('count')); ?>"><?php esc_html_e('文章数量：', 'aksrt'); ?></label>
			<input class="tiny-text" id="<?php echo esc_attr($this->get_field_id('count')); ?>" name="<?php echo esc_attr($this->get_field_name('count')); ?>" type="number" min="1" max="12" value="<?php echo (int) $count; ?>">
		</p>
		<p>
			<label for="<?php echo esc_attr($this->get_field_id('columns')); ?>"><?php esc_html_e('桌面列数：', 'aksrt'); ?></label>
			<input class="tiny-text" id="<?php echo esc_attr($this->get_field_id('columns')); ?>" name="<?php echo esc_attr($this->get_field_name('columns')); ?>" type="number" min="1" max="4" value="<?php echo (int) $columns; ?>">
		</p>
		<p>
			<label for="<?php echo esc_attr($this->get_field_id('layout')); ?>"><?php esc_html_e('布局：', 'aksrt'); ?></label>
			<select class="widefat" id="<?php echo esc_attr($this->get_field_id('layout')); ?>" name="<?php echo esc_attr($this->get_field_name('layout')); ?>">
				<?php foreach (aksrt_home_widget_allowed_layouts() as $value => $label) : ?>
					<option value="<?php echo esc_attr($value); ?>" <?php selected($layout, $value); ?>>
						<?php echo esc_html($label); ?>
					</option>
				<?php endforeach; ?>
			</select>
		</p>
		<p>
			<input class="checkbox" type="checkbox" <?php checked($show_more); ?> id="<?php echo esc_attr($this->get_field_id('show_more')); ?>" name="<?php echo esc_attr($this->get_field_name('show_more')); ?>" value="1">
			<label for="<?php echo esc_attr($this->get_field_id('show_more')); ?>"><?php esc_html_e('显示分类链接', 'aksrt'); ?></label>
		</p>
		<p>
			<label><?php esc_html_e('分页', 'aksrt'); ?>
				<select name="<?php echo esc_attr($this->get_field_name('paginate')); ?>">
					<option value="none" <?php selected(($instance['paginate'] ?? 'none'), 'none'); ?>><?php esc_html_e('无', 'aksrt'); ?></option>
					<option value="ajax" <?php selected(($instance['paginate'] ?? ''), 'ajax'); ?>><?php esc_html_e('AJAX', 'aksrt'); ?></option>
					<option value="number" <?php selected(($instance['paginate'] ?? ''), 'number'); ?>><?php esc_html_e('数字分页', 'aksrt'); ?></option>
				</select>
			</label>
		</p>
		<?php if (function_exists('aksrt_widget_render_location_help')) { aksrt_widget_render_location_help('hybrid'); } ?>
		<?php
}

	public function update($new_instance, $old_instance): array {
		$business = [
			'title'       => sanitize_text_field($new_instance['title'] ?? ''),
			'category_id' => absint($new_instance['category_id'] ?? 0),
			'count'       => max(1, min(12, absint($new_instance['count'] ?? 6))),
			'columns'     => max(1, min(4, absint($new_instance['columns'] ?? 3))),
			'layout'      => aksrt_home_widget_resolve_layout($new_instance['layout'] ?? 'card', 'card'),
			'show_more'   => ! empty($new_instance['show_more']) ? 1 : 0,
			'paginate'    => in_array(sanitize_key((string) ($new_instance['paginate'] ?? 'none')), ['none', 'ajax', 'number'], true) ? sanitize_key((string) ($new_instance['paginate'] ?? 'none')) : 'none',
		]; return $business;
	}

	public static function resolve_category_id_static(array $instance): int {
		$category_id = absint($instance['category_id'] ?? 0);
		if ($category_id > 0) {
			return $category_id;
		}

		$fallback = aksrt_home_widget_fallback_category_ids(1);
		return $fallback[0] ?? 0;
	}

	private function resolve_category_id(array $instance): int {
		return self::resolve_category_id_static($instance);
	}
}