<?php
/**
 * Message center query and server-side fragment renderers.
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

/** @return array<string,string> */
function aksrt_message_center_views(): array {
	return [
		'unread' => __('未读消息', 'aksrt'),
		'posts'  => __('文章评论', 'aksrt'),
		'like'   => __('点赞喜欢', 'aksrt'),
		'system' => __('系统通知', 'aksrt'),
	];
}

function aksrt_normalize_message_view(string $view): string {
	$view = sanitize_key($view);
	return array_key_exists($view, aksrt_message_center_views()) ? $view : 'unread';
}

function aksrt_get_message_center_paginate_type(): string {
	$settings = class_exists('\AKSRT\Settings\Settings')
		? \AKSRT\Settings\Settings::notification_settings()
		: [];
	$type = sanitize_key((string) ($settings['paginate_type'] ?? 'ajax_lists'));
	return in_array($type, ['ajax_lists', 'default'], true) ? $type : 'ajax_lists';
}

function aksrt_message_category_for_type(string $type): string {
	$type = sanitize_key($type);
	if (str_starts_with($type, 'asset_')) {
		return '';
	}
	if (
		in_array($type, ['like', 'post_like', 'comment_like', 'follow', 'followed', 'hot'], true)
		|| str_starts_with($type, 'like_')
		|| str_starts_with($type, 'follow_')
		|| str_starts_with($type, 'followed_')
	) {
		return 'like';
	}
	if (
		in_array($type, ['posts', 'post', 'comment', 'comment_reply', 'comment_approved', 'pending_comments', 'favorite', 'post_favorite'], true)
		|| str_starts_with($type, 'comment_')
		|| str_starts_with($type, 'favorite_')
	) {
		return 'posts';
	}
	return 'system';
}

/** @return array<int,array<string,mixed>> */
function aksrt_get_message_center_items(int $user_id, string $view): array {
	$view = aksrt_normalize_message_view($view);
	$items = function_exists('aksrt_get_user_all_notifications')
		? aksrt_get_user_all_notifications($user_id)
		: [];

	return array_values(array_filter($items, static function (array $item) use ($view): bool {
		$category = aksrt_message_category_for_type((string) ($item['type'] ?? 'notice'));
		if ($category === '') {
			return false;
		}
		if ($view === 'unread') {
			return empty($item['read']);
		}
		return $category === $view;
	}));
}

/** @return array{unread:int,posts:int,like:int,system:int} */
function aksrt_get_message_center_counts(int $user_id): array {
	$counts = ['unread' => 0, 'posts' => 0, 'like' => 0, 'system' => 0];
	$items = function_exists('aksrt_get_user_all_notifications')
		? aksrt_get_user_all_notifications($user_id)
		: [];

	foreach ($items as $item) {
		$category = aksrt_message_category_for_type((string) ($item['type'] ?? 'notice'));
		if ($category === '' || !empty($item['read'])) {
			continue;
		}
		$counts['unread']++;
		$counts[$category]++;
	}
	return $counts;
}

/** @return array<string,mixed>|null */
function aksrt_get_message_center_item(int $user_id, int $notification_id): ?array {
	if ($user_id <= 0 || $notification_id <= 0) {
		return null;
	}
	global $wpdb;
	$table = class_exists('\AKSRT\Core\DBMigrator') ? \AKSRT\Core\DBMigrator::table('notification') : '';
	if ($table === '') return null;
	$row = $wpdb->get_row($wpdb->prepare(
		"SELECT id, type, title, description, target_url, is_read, created_at, read_at FROM {$table} WHERE id = %d AND user_id = %d",
		$notification_id,
		$user_id
	), ARRAY_A);
	if (!is_array($row) || aksrt_message_category_for_type((string) ($row['type'] ?? 'notice')) === '') return null;
	return [
		'id'         => (string) $row['id'],
		'type'       => (string) $row['type'],
		'title'      => (string) $row['title'],
		'desc'       => (string) ($row['description'] ?? ''),
		'url'        => (string) ($row['target_url'] ?? ''),
		'read'       => !empty($row['is_read']) ? 1 : 0,
		'created_at' => (string) ($row['created_at'] ?? ''),
		'read_at'    => (string) ($row['read_at'] ?? ''),
	];
}

function aksrt_message_icon_class(string $type): string {
	$icons = [
		'comment_reply'    => 'fa fas fa-comment-dots',
		'comment_approved' => 'fa fas fa-check-circle',
		'pending_comments' => 'fa fas fa-clock',
		'post_favorite'    => 'fa fas fa-star',
		'post_like'        => 'fa fas fa-heart',
		'comment_like'     => 'fa fas fa-thumbs-up',
		'followed'         => 'fa fas fa-user-plus',
		'download_ready'   => 'fa fas fa-download',
		'upload_moderation'=> 'fa fas fa-image',
		'verify_email'     => 'fa fas fa-envelope-open',
		'pay'              => 'fa fas fa-file-alt',
		'order_paid'       => 'fa fas fa-file-alt',
		'order_refund'     => 'fa fas fa-undo',
		'vip'              => 'fa fas fa-certificate',
		'pay_vip'          => 'fa fas fa-certificate',
		'medal'            => 'fa fas fa-certificate',
		'badge'            => 'fa fas fa-certificate',
		'ban_appeal'       => 'fa fas fa-gavel',
		'user_ban'         => 'fa fas fa-ban',
		'auth_apply'       => 'fa fas fa-id-badge',
		'auth_apply_reply' => 'fa fas fa-id-badge',
	];
	return $icons[$type] ?? 'fa fas fa-bell';
}

function aksrt_message_time(array $item): string {
	if (!empty($item['stateful'])) {
		return __('状态提醒', 'aksrt');
	}
	$created_at = (string) ($item['created_at'] ?? '');
	return $created_at !== '' ? get_date_from_gmt($created_at, 'Y-m-d H:i') : '';
}

function aksrt_render_message_center_nav(string $view, array $counts): void {
	$view = aksrt_normalize_message_view($view);
	?>
	<ul class="messages-nav__list">
		<?php foreach (aksrt_message_center_views() as $key => $label) : ?>
			<li>
				<a href="<?php echo esc_url(aksrt_get_messages_page_url($key)); ?>"
					class="messages-nav__item<?php echo $view === $key ? ' is-active' : ''; ?>"
					data-message-view="<?php echo esc_attr($key); ?>"
					<?php echo $view === $key ? 'aria-current="page"' : ''; ?>>
					<span><?php echo esc_html($label); ?></span>
					<span class="messages-nav__badge" data-type="<?php echo esc_attr($key); ?>" data-count="<?php echo esc_attr((string) ($counts[$key] ?? 0)); ?>"><?php echo esc_html((string) ($counts[$key] ?? 0)); ?></span>
				</a>
			</li>
		<?php endforeach; ?>
	</ul>
	<div class="messages-nav__actions">
		<button type="button" class="messages-nav__action-btn js-msg-mark-all-read"><?php esc_html_e('全部已读', 'aksrt'); ?></button>
		<button type="button" class="messages-nav__action-btn js-msg-clear-read"><?php esc_html_e('清除已读', 'aksrt'); ?></button>
	</div>
	<?php
}

function aksrt_render_message_item(array $item, string $view): void {
	$type = (string) ($item['type'] ?? 'notice');
	$id = (string) ($item['id'] ?? '');
	$title = (string) ($item['title'] ?? '');
	$description = (string) ($item['desc'] ?? '');
	$target_url = (string) ($item['url'] ?? '');
	$is_read = !empty($item['read']);
	$is_stateful = !empty($item['stateful']);
	?>
	<article class="message-item<?php echo $is_read ? '' : ' is-unread'; ?>" data-notification-id="<?php echo esc_attr($id); ?>">
		<span class="message-item__icon"><i class="<?php echo esc_attr(aksrt_message_icon_class($type)); ?>" aria-hidden="true"></i></span>
		<div class="message-item__body">
			<?php if (!$is_stateful) : ?>
				<button type="button" class="message-item__title js-msg-detail" data-id="<?php echo esc_attr($id); ?>" data-view="<?php echo esc_attr($view); ?>">
					<?php echo esc_html($title); ?>
					<?php if (!$is_read) : ?><span class="message-item__new-badge"><?php esc_html_e('新', 'aksrt'); ?></span><?php endif; ?>
				</button>
			<?php else : ?>
				<div class="message-item__title"><?php echo esc_html($title); ?></div>
			<?php endif; ?>
			<?php if ($description !== '') : ?><div class="message-item__desc"><?php echo esc_html($description); ?></div><?php endif; ?>
			<div class="message-item__time"><?php echo esc_html(aksrt_message_time($item)); ?></div>
		</div>
		<div class="message-item__actions">
			<?php if ($is_stateful && $target_url !== '') : ?><a href="<?php echo esc_url($target_url); ?>" class="message-item__action-btn"><?php esc_html_e('立即处理', 'aksrt'); ?></a><?php endif; ?>
			<?php if (!$is_stateful) : ?><button type="button" class="message-item__action-btn js-msg-detail" data-id="<?php echo esc_attr($id); ?>" data-view="<?php echo esc_attr($view); ?>"><?php esc_html_e('详情', 'aksrt'); ?></button><?php endif; ?>
			<?php if (!$is_stateful && !$is_read) : ?><button type="button" class="message-item__action-btn js-msg-mark-read" data-id="<?php echo esc_attr($id); ?>"><?php esc_html_e('已读', 'aksrt'); ?></button><?php endif; ?>
			<?php if (!$is_stateful) : ?><button type="button" class="message-item__action-btn message-item__action-btn--danger js-msg-delete" data-id="<?php echo esc_attr($id); ?>"><?php esc_html_e('删除', 'aksrt'); ?></button><?php endif; ?>
		</div>
	</article>
	<?php
}

function aksrt_render_message_center_list(int $user_id, string $view, int $page = 1): void {
	$items = aksrt_get_message_center_items($user_id, $view);
	$per_page = 20;
	$total_pages = max(1, (int) ceil(count($items) / $per_page));
	$page = max(1, min($total_pages, $page));
	$paginate_type = aksrt_get_message_center_paginate_type();
	$items = $paginate_type === 'ajax_lists'
		? array_slice($items, 0, $page * $per_page)
		: array_slice($items, ($page - 1) * $per_page, $per_page);

	if (!$items) {
		?>
		<div class="messages-empty"><span class="messages-empty__icon"><i class="fa fas fa-bell-slash"></i></span><p class="messages-empty__text"><?php esc_html_e('暂无消息', 'aksrt'); ?></p></div>
		<?php
		return;
	}
	?>
	<div class="messages-list">
		<?php foreach ($items as $item) { aksrt_render_message_item($item, $view); } ?>
		<?php
		if (function_exists('aksrt_get_message_placeholder')) {
			echo aksrt_get_message_placeholder(4); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- 固定骨架结构。
		}
		?>
	</div>
	<?php if ($total_pages > 1) : ?>
		<?php if ($paginate_type === 'ajax_lists' && $page < $total_pages) : ?>
			<nav class="messages-pagination messages-pagination--load-more" aria-label="<?php esc_attr_e('消息分页', 'aksrt'); ?>">
				<button type="button" class="messages-pagination__more" data-message-next-page="<?php echo esc_attr((string) ($page + 1)); ?>">
					<span><?php esc_html_e('加载更多消息', 'aksrt'); ?></span>
					<small><?php echo esc_html(sprintf(__('%1$d / %2$d 页', 'aksrt'), $page, $total_pages)); ?></small>
				</button>
			</nav>
		<?php elseif ($paginate_type === 'default') : ?>
			<?php
			$numbers = array_values(array_unique(array_filter([
				1,
				$page - 2,
				$page - 1,
				$page,
				$page + 1,
				$page + 2,
				$total_pages,
			], static fn(int $number): bool => $number >= 1 && $number <= $total_pages)));
			sort($numbers);
			$previous_number = 0;
			?>
			<nav class="messages-pagination messages-pagination--numbers" aria-label="<?php esc_attr_e('消息分页', 'aksrt'); ?>">
				<button type="button" class="messages-pagination__button messages-pagination__button--edge" data-message-page="<?php echo esc_attr((string) max(1, $page - 1)); ?>" aria-label="<?php esc_attr_e('上一页', 'aksrt'); ?>" <?php disabled($page, 1); ?>><i class="fa fas fa-angle-left" aria-hidden="true"></i></button>
				<?php foreach ($numbers as $number) : ?>
					<?php if ($previous_number > 0 && $number - $previous_number > 1) : ?><span class="messages-pagination__ellipsis" aria-hidden="true">…</span><?php endif; ?>
					<button type="button" class="messages-pagination__button<?php echo $number === $page ? ' is-current' : ''; ?>" data-message-page="<?php echo esc_attr((string) $number); ?>" <?php echo $number === $page ? 'aria-current="page"' : ''; ?> <?php disabled($number, $page); ?>><?php echo esc_html((string) $number); ?></button>
					<?php $previous_number = $number; ?>
				<?php endforeach; ?>
				<button type="button" class="messages-pagination__button messages-pagination__button--edge" data-message-page="<?php echo esc_attr((string) min($total_pages, $page + 1)); ?>" aria-label="<?php esc_attr_e('下一页', 'aksrt'); ?>" <?php disabled($page, $total_pages); ?>><i class="fa fas fa-angle-right" aria-hidden="true"></i></button>
			</nav>
		<?php endif; ?>
	<?php endif;
}

function aksrt_render_message_center_detail(array $item, string $view): void {
	$type = (string) ($item['type'] ?? 'notice');
	?>
	<article class="message-detail" data-notification-id="<?php echo esc_attr((string) ($item['id'] ?? '')); ?>">
		<header class="message-detail__header">
			<button type="button" class="message-detail__back" data-message-back data-view="<?php echo esc_attr($view); ?>"><i class="fa fas fa-arrow-left" aria-hidden="true"></i> <?php esc_html_e('返回消息列表', 'aksrt'); ?></button>
			<span class="message-detail__icon"><i class="<?php echo esc_attr(aksrt_message_icon_class($type)); ?>" aria-hidden="true"></i></span>
			<h2 class="message-detail__title"><?php echo esc_html((string) ($item['title'] ?? '')); ?></h2>
			<p class="message-detail__meta"><?php echo esc_html(aksrt_message_time($item)); ?></p>
		</header>
		<div class="message-detail__content"><?php echo wp_kses_post(wpautop(esc_html((string) ($item['desc'] ?? '')))); ?></div>
		<footer class="message-detail__actions">
			<button type="button" class="message-item__action-btn message-item__action-btn--danger js-msg-delete" data-id="<?php echo esc_attr((string) ($item['id'] ?? '')); ?>" data-detail="1"><?php esc_html_e('删除消息', 'aksrt'); ?></button>
		</footer>
	</article>
	<?php
}

add_action('wp_ajax_aksrt_load_message_center', function (): void {
	if (!is_user_logged_in()) {
		wp_send_json_error(['message' => __('请先登录', 'aksrt')], 401);
	}
	$nonce = isset($_POST['nonce']) ? (string) wp_unslash($_POST['nonce']) : '';
	if (!wp_verify_nonce($nonce, 'aksrt_public_nonce')) {
		wp_send_json_error(['message' => __('安全验证失败', 'aksrt')], 403);
	}

	$user_id = get_current_user_id();
	$view = aksrt_normalize_message_view((string) ($_POST['view'] ?? 'unread'));
	$page = max(1, absint($_POST['page'] ?? 1));
	$notification_id = absint($_POST['notification_id'] ?? 0);
	$detail = null;
	if ($notification_id > 0) {
		$detail = aksrt_get_message_center_item($user_id, $notification_id);
		if (!$detail) {
			wp_send_json_error(['message' => __('消息不存在或已删除', 'aksrt')], 404);
		}
		aksrt_mark_user_notification_read($user_id, (string) $notification_id);
		$detail['read'] = 1;
	}

	$counts = aksrt_get_message_center_counts($user_id);
	ob_start();
	aksrt_render_message_center_nav($view, $counts);
	$nav_html = (string) ob_get_clean();
	ob_start();
	if ($detail) {
		aksrt_render_message_center_detail($detail, $view);
	} else {
		aksrt_render_message_center_list($user_id, $view, $page);
	}
	$content_html = (string) ob_get_clean();

	wp_send_json_success([
		'view'          => $view,
		'page'          => $page,
		'detail'        => $notification_id,
		'paginate_type' => aksrt_get_message_center_paginate_type(),
		'nav'           => $nav_html,
		'content'       => $content_html,
		'unread'        => $counts['unread'],
	]);
});