<?php
/**
 * Forum view builder service.
 *
 * Extracted from AKSRT_Forum to isolate topic listing, home/stream views,
 * user-dimension queries, topic/compose views, stats, and sticky topics
 * into a cohesive read-path unit.
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

class AKSRT_Forum_View_Builder {
    use AKSRT_Forum_View_Builder_Part_1;
    use AKSRT_Forum_View_Builder_Part_2;


    private AKSRT_Forum $forum;

    public function __construct(AKSRT_Forum $forum) {
        $this->forum = $forum;
    }

    public function get_topic_list(array $args = []): array {
        $board_id = (int) ($args['board_id'] ?? 0);
        $limit = max(1, min(100, (int) ($args['limit'] ?? ($args['per_page'] ?? 20))));
        $page = max(1, (int) ($args['page'] ?? $args['paged'] ?? 1));
        $offset = array_key_exists('offset', $args)
            ? max(0, (int) $args['offset'])
            : ($page - 1) * $limit;
        $status = sanitize_key((string) ($args['status'] ?? 'publish'));
        $keyword = sanitize_text_field((string) ($args['keyword'] ?? ''));
        $visibility = sanitize_key((string) ($args['visibility'] ?? ''));
        $review_status = sanitize_key((string) ($args['review_status'] ?? ''));
        $author_id = (int) ($args['author_id'] ?? 0);
        $orderby = sanitize_key((string) ($args['orderby'] ?? 'date'));
        $viewer_user_id = (int) ($args['viewer_user_id'] ?? get_current_user_id());
        $include_hidden = !empty($args['include_hidden']);

        $query_args = [
            'post_type' => 'aksrt_forum_topic',
            'posts_per_page' => $limit,
            'offset' => $offset,
            'post_status' => $this->forum->normalize_post_status_query($status),
            'order' => 'DESC',
            'ignore_sticky_posts' => true,
        ];

        if ($orderby === 'views') {
            $query_args['orderby'] = 'meta_value_num';
            $query_args['meta_key'] = '_aksrt_views';
        } elseif ($orderby === 'recommend') {
            $query_args['orderby'] = 'meta_value_num';
            $query_args['meta_key'] = '_aksrt_recommend_score';
        } elseif ($orderby === 'comment_count') {
            $query_args['orderby'] = 'comment_count';
        } elseif ($orderby === 'score') {
            $query_args['orderby'] = 'meta_value_num';
            $query_args['meta_key'] = '_aksrt_score';
        } elseif ($orderby === 'favorites') {
            $query_args['orderby'] = 'meta_value_num';
            $query_args['meta_key'] = '_aksrt_favorite_count';
        } else {
            $query_args['orderby'] = 'date';
        }

        if ($keyword !== '') {
            $query_args['s'] = $keyword;
        }

        if ($author_id > 0) {
            $query_args['author'] = $author_id;
        }

        $plate_id = (int) ($args['plate_id'] ?? 0);
        $plate_ids = $args['plate_ids'] ?? [];
        if (!empty($plate_ids) && is_array($plate_ids)) {
            $query_args['meta_query'][] = [
                'key'     => '_aksrt_plate_id',
                'value'   => array_map('intval', $plate_ids),
                'type'    => 'NUMERIC',
                'compare' => 'IN',
            ];
        } elseif ($plate_id > 0) {
            $query_args['meta_query'][] = [
                'key'     => '_aksrt_plate_id',
                'value'   => $plate_id,
                'type'    => 'NUMERIC',
                'compare' => '=',
            ];
        } elseif ($board_id > 0) {
            $query_args['tax_query'] = [[
                'taxonomy' => 'aksrt_forum_board',
                'field' => 'term_id',
                'terms' => $board_id,
            ]];
        }

        $meta_query = [];
        if ($visibility !== '') {
            $meta_query[] = [
                'key' => '_aksrt_visibility',
                'value' => $visibility,
                'compare' => '=',
            ];
        }

        if ($review_status !== '') {
            $meta_query[] = [
                'key' => '_aksrt_review_status',
                'value' => $review_status,
                'compare' => '=',
            ];
        }

        if (!empty($meta_query)) {
            $query_args['meta_query'] = $meta_query;
        }

        $query = new WP_Query($query_args);
        $items = [];

        while ($query->have_posts()) {
            $query->the_post();
            $post = get_post(get_the_ID());
            if (!$post) {
                continue;
            }

            $topic = $this->forum->build_topic_payload($post, $viewer_user_id);
            if (!$include_hidden && !$topic['can_view']) {
                continue;
            }

            $items[] = $topic;
        }

        wp_reset_postdata();

        return [
            'items' => $items,
            'total' => (int) $query->found_posts,
            'max_pages' => (int) $query->max_num_pages,
            'page' => $page,
        ];
    }

    /**
     * Get forum homepage view.
     */
    public function get_home_view(int $user_id = 0): array {
        $boards = $this->forum->get_boards();
        $stats = $this->get_stats();
        $recent = $this->get_topic_list([
            'limit' => 10,
            'status' => 'publish',
            'viewer_user_id' => $user_id,
        ]);
        $hot = $this->get_topic_list([
            'limit' => 8,
            'status' => 'publish',
            'viewer_user_id' => $user_id,
            'orderby' => 'views',
        ]);

        $applications = [];
        if ($user_id > 0) {
            foreach ($boards as $board) {
                $applications[(int) $board['id']] = $this->forum->get_board_application_for_user($user_id, (int) $board['id']);
            }
        }

        $config = $this->forum->get_config();
        $home_tabs = $config['homepage']['tabs'] ?? [
            ['type' => 'follow', 'label' => '关注'],
            ['type' => 'synthesis', 'label' => '综合'],
            ['type' => 'plate', 'label' => '版块'],
        ];
        $active_index = (int) ($config['homepage']['tab_active_index'] ?? 1);
        $quick_posts = !empty($config['homepage']['quick_posts']);

        return [
            'boards' => $boards,
            'recent_topics' => $recent['items'],
            'hot_topics' => $hot['items'],
            'stats' => $stats,
            'permissions' => [
                'can_compose'    => $user_id > 0 && $this->forum->forum_user_can($user_id, 'compose_post'),
                'can_manage'     => $this->forum->is_forum_admin($user_id),
                'can_create_plate' => $this->forum->forum_user_can($user_id, 'plate_create'),
                'user_tier'      => $user_id > 0 ? $this->forum->get_user_plate_tier($user_id, 0) : AKSRT_Forum::TIER_NONE,
            ],
            'applications' => $applications,
            'home_tabs'    => $home_tabs,
            'active_index' => $active_index,
            'quick_posts'  => $quick_posts,
        ];
    }

    // ── §7.10 Tab data streams ──────────────────────────────────────────

    /**
     * Get topics from plates the user follows.
     *
     * @return array{items:array,total:int,max_pages:int}
     */
    public function get_follow_stream(int $user_id, int $page = 1, int $limit = 15): array {
        if ($user_id <= 0) {
            return ['items' => [], 'total' => 0, 'max_pages' => 1];
        }
        $follow_ids = get_user_meta($user_id, 'aksrt_follow_plate', true);
        $follow_ids = is_array($follow_ids) ? array_filter(array_map('intval', $follow_ids)) : [];
        if (empty($follow_ids)) {
            return ['items' => [], 'total' => 0, 'max_pages' => 1];
        }

        return $this->get_topic_list([
            'plate_ids'      => $follow_ids,
            'page'           => $page,
            'limit'          => $limit,
            'status'         => 'publish',
            'viewer_user_id' => $user_id,
        ]);
    }

    /**
     * Get synthesis (all topics) stream sorted by date.
     *
     * @return array{items:array,total:int,max_pages:int}
     */
    public function get_synthesis_stream(int $page = 1, int $limit = 15, int $viewer = 0): array {
        return $this->get_topic_list([
            'page'           => $page,
            'limit'          => $limit,
            'status'         => 'publish',
            'viewer_user_id' => $viewer,
        ]);
    }

    /**
     * Get pending-review topics for moderators.
     *
     * @return array{items:array,total:int,max_pages:int}
     */
    public function get_pending_stream(int $user_id, int $page = 1, int $limit = 15): array {
        if ($user_id <= 0 || !$this->forum->is_forum_admin($user_id)) {
            return ['items' => [], 'total' => 0, 'max_pages' => 1];
        }
        return $this->get_topic_list([
            'page'           => $page,
            'limit'          => $limit,
            'status'         => 'pending',
            'viewer_user_id' => $user_id,
            'include_hidden' => true,
        ]);
    }

    /**
     * AJAX: Load a forum home tab stream.
     */
    public function ajax_home_tab(): void {
        check_ajax_referer('aksrt_public_nonce', 'nonce');

        $tab_type = sanitize_key((string) ($_POST['tab_type'] ?? 'synthesis'));
        $page     = max(1, (int) ($_POST['page'] ?? 1));
        $user_id  = get_current_user_id();

        switch ($tab_type) {
            case 'follow':
                $result = $this->get_follow_stream($user_id, $page);
                break;
            case 'pending':
                $result = $this->get_pending_stream($user_id, $page);
                break;
            case 'plate':
                wp_send_json_success([
                    'html'      => '',
                    'type'      => 'plate',
                    'boards'    => $this->forum->get_boards(),
                    'total'     => 0,
                    'max_pages' => 1,
                    'page'      => 1,
                ]);
                return;
            default:
                $result = $this->get_synthesis_stream($page, 15, $user_id);
        }

        ob_start();
        if (!empty($result['items'])) {
            foreach ($result['items'] as $topic) {
                $this->render_topic_row($topic);
            }
        } else {
            echo '<div class="aksrt-forum__empty"><i class="far fa-comment-dots"></i><p>' . esc_html__('暂无内容', 'aksrt') . '</p></div>';
        }
        $html = ob_get_clean();

        wp_send_json_success([
            'html'      => $html,
            'type'      => $tab_type,
            'total'     => $result['total'],
            'max_pages' => $result['max_pages'],
            'page'      => $page,
            'has_more'  => $page < $result['max_pages'],
        ]);
    }

    /**
     * Render a single topic row (reusable for AJAX and initial render).
     */
    public function render_topic_row(array $topic): void {
        $board = !empty($topic['boards'][0]) ? $topic['boards'][0] : null;
        $names = $this->forum->get_config()['names'] ?? [];
        ?>
        <article class="aksrt-forum-topic-row">
            <div class="aksrt-forum-topic-row__avatar">
                <?php if (!empty($topic['author']['avatar_url'])) : ?>
                    <img src="<?php echo esc_url((string) $topic['author']['avatar_url']); ?>" alt="" width="40" height="40" loading="lazy">
                <?php endif; ?>
            </div>
            <div class="aksrt-forum-topic-row__body">
                <div class="aksrt-forum-topic-row__title-wrap">
                    <?php if (!empty($topic['sticky'])) : ?>
                        <span class="aksrt-forum-topic-row__badge aksrt-forum-topic-row__badge--sticky"><?php esc_html_e('置顶', 'aksrt'); ?></span>
                    <?php endif; ?>
                    <?php if (!empty($topic['featured'])) : ?>
                        <span class="aksrt-forum-topic-row__badge aksrt-forum-topic-row__badge--featured"><?php esc_html_e('精华', 'aksrt'); ?></span>
                    <?php endif; ?>
                    <?php if (($topic['bbs_type'] ?? '') === 'question') : ?>
                        <span class="aksrt-forum-topic-row__badge aksrt-forum-topic-row__badge--question"><?php echo esc_html($names['question_badge'] ?? __('提问', 'aksrt')); ?></span>
                    <?php endif; ?>
                    <h3 class="aksrt-forum-topic-row__title">
                        <a href="<?php echo esc_url((string) ($topic['permalink'] ?? '#')); ?>"><?php echo esc_html((string) ($topic['title'] ?? '')); ?></a>
                    </h3>
                </div>
                <div class="aksrt-forum-topic-row__meta">
                    <?php if ($board) : ?>
                        <a class="aksrt-forum-topic-row__board" href="<?php echo esc_url((string) ($board['url'] ?? '#')); ?>"><?php echo esc_html((string) ($board['name'] ?? '')); ?></a>
                    <?php endif; ?>
                    <span class="aksrt-forum-topic-row__author"><?php echo esc_html((string) ($topic['author']['display_name'] ?? '')); ?></span>
                    <span class="aksrt-forum-topic-row__time"><?php echo esc_html((string) ($topic['date'] ?? '')); ?></span>
                    <span><i class="fas fa-eye"></i> <?php echo esc_html(number_format_i18n((int) ($topic['views'] ?? 0))); ?></span>
                    <span><i class="fas fa-comment"></i> <?php echo esc_html(number_format_i18n((int) ($topic['comment_count'] ?? 0))); ?></span>
                </div>
            </div>
        </article>
        <?php
    }

    public function get_user_forum_topics(int $user_id, array $args = []): array {
        $status = $args['status'] ?? 'publish';
        $page   = max(1, (int) ($args['page'] ?? 1));
        $limit  = max(1, min(50, (int) ($args['limit'] ?? 10)));

        $query_args = [
            'post_type'      => 'aksrt_forum_topic',
            'author'         => $user_id,
            'post_status'    => $status,
            'posts_per_page' => $limit,
            'paged'          => $page,
            'orderby'        => 'date',
            'order'          => 'DESC',
        ];

        $query = new \WP_Query($query_args);
        $items = [];
        foreach ($query->posts as $post) {
            $items[] = $this->forum->build_topic_payload($post, $user_id);
        }

        return [
            'items'     => $items,
            'total'     => (int) $query->found_posts,
            'max_pages' => (int) $query->max_num_pages,
        ];
    }

    /**
     * Get a user's favorited forum topics.
     *
     * @return array{items:array,total:int,max_pages:int}
     */
    public function get_user_favorite_topics(int $user_id, int $page = 1, int $limit = 10): array {
        $fav_ids = get_user_meta($user_id, 'aksrt_favorite_forum_posts', true);
        $fav_ids = is_array($fav_ids) ? array_map('intval', array_filter($fav_ids)) : [];

        if (empty($fav_ids)) {
            return ['items' => [], 'total' => 0, 'max_pages' => 1];
        }

        $query = new \WP_Query([
            'post_type'      => 'aksrt_forum_topic',
            'post__in'       => $fav_ids,
            'post_status'    => 'publish',
            'posts_per_page' => $limit,
            'paged'          => $page,
            'orderby'        => 'post__in',
        ]);

        $items = [];
        foreach ($query->posts as $post) {
            $items[] = $this->forum->build_topic_payload($post, $user_id);
        }

        return [
            'items'     => $items,
            'total'     => (int) $query->found_posts,
            'max_pages' => (int) $query->max_num_pages,
        ];
    }

    /**
     * Get a user's managed plates (plates where user is moderator/author).
     *
     * @return array{owned:array,moderating:array}
     */
}