<?php
defined('ABSPATH') || exit;

trait AKSRT_Forum_Board_Service_Part_2 {


    /**
     * Get board page view (统一入口 CPT/taxonomy).
     */
    public function get_board_view(int $board_id, array $args = []): array {
        $user_id = (int) ($args['user_id'] ?? get_current_user_id());
        $page = max(1, (int) ($args['paged'] ?? $args['page'] ?? 1));
        $orderby = sanitize_key((string) ($args['orderby'] ?? $args['sort'] ?? ''));

        $board_page = class_exists('AKSRT_Settings')
            ? (AKSRT_Settings::get_forum_settings()['board_page'] ?? [])
            : [];
        $tabs = is_array($board_page['tabs'] ?? null) ? $board_page['tabs'] : [
            ['label' => '全部', 'sort' => 'date'],
            ['label' => '推荐', 'sort' => 'featured'],
            ['label' => '最新回复', 'sort' => 'last_reply'],
            ['label' => '热门', 'sort' => 'hot'],
            ['label' => '精华', 'sort' => 'essence'],
        ];
        $allowed_sorts = [];
        foreach ($tabs as $tab) {
            $sort = sanitize_key((string) ($tab['sort'] ?? ''));
            if ($sort !== '') {
                $allowed_sorts[] = $sort;
            }
        }
        if ($orderby === '' || !in_array($orderby, $allowed_sorts, true)) {
            $active_index = max(0, (int) ($board_page['tab_active_index'] ?? 0));
            $orderby = sanitize_key((string) ($tabs[$active_index]['sort'] ?? 'date'));
            if ($orderby === '') {
                $orderby = 'date';
            }
        }

        $compose_url = function_exists('aksrt_get_forum_compose_url')
            ? aksrt_get_forum_compose_url(['board' => $board_id])
            : home_url('/');
        $top_info = !isset($board_page['top_info']) || !empty($board_page['top_info']);

        if ($this->forum->is_plate_cpt_active()) {
            $view = $this->get_plate_view_compat($board_id, $user_id, $page, $orderby);
            $view['tabs'] = $tabs;
            $view['active_sort'] = $orderby;
            $view['top_info'] = $top_info;
            $view['compose_url'] = $compose_url;
            return $view;
        }

        $board = get_term($board_id, 'aksrt_forum_board');

        if (!$board || is_wp_error($board)) {
            return [
                'board' => null,
                'topics' => [],
                'sticky_topics' => [],
                'moderators' => [],
                'pagination' => ['page' => 1, 'max_pages' => 1, 'total' => 0],
                'permissions' => [],
                'application' => null,
                'board_options' => [],
                'tabs' => $tabs,
                'active_sort' => $orderby,
                'top_info' => $top_info,
                'compose_url' => function_exists('aksrt_get_forum_compose_url') ? aksrt_get_forum_compose_url() : home_url('/'),
            ];
        }

        $topics = $this->forum->get_topic_list([
            'board_id' => $board_id,
            'page' => $page,
            'limit' => 20,
            'status' => 'publish',
            'viewer_user_id' => $user_id,
            'orderby' => $orderby,
        ]);

        $sticky_topics = $this->forum->get_sticky_topics_for_board($board_id);
        $board_link = get_term_link($board);

        return [
            'board' => [
                'id' => $board_id,
                'name' => (string) $board->name,
                'description' => (string) $board->description,
                'content' => '',
                'icon' => (string) get_term_meta($board_id, '_aksrt_icon', true),
                'topic_count' => (int) $board->count,
                'reply_count' => 0,
                'today_reply_count' => 0,
                'views' => 0,
                'follow_count' => 0,
                'last_reply' => '',
                'last_post' => '',
                'url' => !is_wp_error($board_link) ? (string) $board_link : '',
                'thumbnail_url' => '',
                'author_id' => 0,
                'allow_view' => 'public',
            ],
            'topics' => $topics['items'],
            'sticky_topics' => array_slice($sticky_topics, 0, 5),
            'moderators' => $this->forum->get_board_moderator_profiles($board_id),
            'pagination' => [
                'page' => $topics['page'],
                'max_pages' => $topics['max_pages'],
                'total' => $topics['total'],
            ],
            'permissions' => [
                'can_compose' => $user_id > 0,
                'can_apply_moderator' => $user_id > 0 && !$this->forum->is_board_moderator($user_id, $board_id),
                'can_moderate' => $this->forum->is_board_moderator($user_id, $board_id),
            ],
            'application' => $user_id > 0 ? $this->forum->get_board_application_for_user($user_id, $board_id) : null,
            'board_options' => $this->get_boards(),
            'tabs' => $tabs,
            'active_sort' => $orderby,
            'top_info' => $top_info,
            'compose_url' => $compose_url,
        ];
    }

    /**
     * Plate CPT board view (backwards-compatible with get_board_view return shape).
     */
    private function get_plate_view_compat(int $plate_id, int $user_id, int $page, string $orderby = 'date'): array {
        $plate = $this->get_plate($plate_id);
        if (!$plate) {
            return [
                'board' => null,
                'topics' => [],
                'sticky_topics' => [],
                'moderators' => [],
                'pagination' => ['page' => 1, 'max_pages' => 1, 'total' => 0],
                'permissions' => [],
                'application' => null,
                'board_options' => [],
            ];
        }

        // Check access permission
        $allow_view = $plate['allow_view'] ?? 'public';
        if (!$this->can_view_plate($user_id, $plate_id, $allow_view)) {
            return [
                'board' => $plate,
                'topics' => [],
                'sticky_topics' => [],
                'moderators' => $this->get_plate_moderator_profiles($plate_id),
                'pagination' => ['page' => 1, 'max_pages' => 1, 'total' => 0],
                'permissions' => [
                    'can_compose' => false,
                    'can_apply_moderator' => false,
                    'can_moderate' => false,
                    'access_denied' => true,
                    'access_reason' => $allow_view,
                ],
                'application' => null,
                'board_options' => $this->get_boards(),
            ];
        }

        $topics = $this->forum->get_topic_list([
            'plate_id' => $plate_id,
            'page' => $page,
            'limit' => 20,
            'status' => 'publish',
            'viewer_user_id' => $user_id,
            'orderby' => $orderby,
        ]);

        $sticky_topics = $this->get_sticky_topics_for_plate($plate_id);

        return [
            'board' => $plate,
            'topics' => $topics['items'],
            'sticky_topics' => array_slice($sticky_topics, 0, 5),
            'moderators' => $this->get_plate_moderator_profiles($plate_id),
            'pagination' => [
                'page' => $topics['page'],
                'max_pages' => $topics['max_pages'],
                'total' => $topics['total'],
            ],
            'permissions' => [
                'can_compose'         => $user_id > 0 && $this->can_compose_in_plate($user_id, $plate_id),
                'can_apply_moderator' => $user_id > 0 && $this->forum->forum_user_can($user_id, 'moderator_apply'),
                'can_moderate'        => $this->forum->forum_user_can($user_id, 'topic_moderate', $plate_id),
                'can_manage_plate'    => $this->forum->forum_user_can($user_id, 'plate_manage', $plate_id),
                'can_manage_mods'     => $this->forum->forum_user_can($user_id, 'moderator_manage', $plate_id),
                'user_tier'           => $this->forum->get_user_plate_tier($user_id, $plate_id),
            ],
            'application' => $user_id > 0 ? $this->forum->get_board_application_for_user($user_id, $plate_id) : null,
            'board_options' => $this->get_boards(),
        ];
    }

    /**
     * Check if a user can view a plate (§7.2 板块阅读权限).
     */
    public function can_view_plate(int $user_id, int $plate_id, string $allow_view = ''): bool {
        if ($allow_view === '') {
            $allow_view = (string) (get_post_meta($plate_id, '_aksrt_allow_view', true) ?: 'public');
        }

        if ($allow_view === 'public') {
            return true;
        }

        if ($user_id <= 0) {
            return false;
        }

        if ($this->is_plate_moderator($user_id, $plate_id)) {
            return true;
        }

        if ($allow_view === 'login') {
            return true;
        }

        if ($allow_view === 'follow') {
            return $this->is_user_following_plate($user_id, $plate_id);
        }

        if ($allow_view === 'role') {
            $allowed_roles = get_post_meta($plate_id, '_aksrt_allow_view_roles', true);
            if (!is_array($allowed_roles) || empty($allowed_roles)) {
                return true;
            }
            $user = get_userdata($user_id);
            if (!$user) {
                return false;
            }
            return !empty(array_intersect($user->roles, $allowed_roles));
        }

        return true;
    }

    /**
     * Check if a user can compose in a plate (§7.2 板块发帖限制).
     */
    public function can_compose_in_plate(int $user_id, int $plate_id): bool {
        if ($user_id <= 0) {
            return false;
        }

        if ($this->is_plate_moderator($user_id, $plate_id)) {
            return true;
        }

        $add_limit = (string) (get_post_meta($plate_id, '_aksrt_add_limit', true) ?: 'all');
        if ($add_limit === 'all') {
            return true;
        }

        $user = get_userdata($user_id);
        if (!$user) {
            return false;
        }

        if ($add_limit === 'role') {
            $allowed_roles = get_post_meta($plate_id, '_aksrt_add_limit_roles', true);
            if (!is_array($allowed_roles) || empty($allowed_roles)) {
                return true;
            }
            return !empty(array_intersect($user->roles, $allowed_roles));
        }

        return true;
    }

    /**
     * Check if a user is following a plate (§7.2 关注).
     */
    public function is_user_following_plate(int $user_id, int $plate_id): bool {
        if ($user_id <= 0) {
            return false;
        }
        $follow_list = get_user_meta($user_id, 'aksrt_follow_plate', true);
        if (!is_array($follow_list)) {
            return false;
        }
        return in_array($plate_id, $follow_list, true);
    }

    /**
     * Toggle user follow on a plate (§7.2 关注/取消关注).
     *
     * @return array{followed:bool,follow_count:int}
     */
    public function toggle_follow_plate(int $user_id, int $plate_id): array {
        if ($user_id <= 0) {
            return ['followed' => false, 'follow_count' => 0];
        }

        $follow_list = get_user_meta($user_id, 'aksrt_follow_plate', true);
        if (!is_array($follow_list)) {
            $follow_list = [];
        }

        $followed = in_array($plate_id, $follow_list, true);
        if ($followed) {
            $follow_list = array_values(array_diff($follow_list, [$plate_id]));
        } else {
            $follow_list[] = $plate_id;
        }

        update_user_meta($user_id, 'aksrt_follow_plate', array_values(array_unique(array_map('intval', $follow_list))));

        // Update plate follow_count
        $count = $this->count_plate_followers($plate_id);
        update_post_meta($plate_id, '_aksrt_follow_count', $count);

        return [
            'followed' => !$followed,
            'follow_count' => $count,
        ];
    }

    /**
     * Count followers for a plate.
     */
    private function count_plate_followers(int $plate_id): int {
        global $wpdb;
        return (int) $wpdb->get_var($wpdb->prepare(
            "SELECT COUNT(*) FROM {$wpdb->usermeta}
             WHERE meta_key = 'aksrt_follow_plate'
             AND meta_value LIKE %s",
            '%i:' . $plate_id . ';%'
        ));
    }

    /**
     * Get plates a user follows.
     */
    public function get_user_followed_plates(int $user_id): array {
        $follow_list = get_user_meta($user_id, 'aksrt_follow_plate', true);
        if (!is_array($follow_list) || empty($follow_list)) {
            return [];
        }

        $plates = get_posts([
            'post_type'      => 'aksrt_forum_plate',
            'post__in'       => array_map('intval', $follow_list),
            'post_status'    => 'publish',
            'posts_per_page' => 100,
            'orderby'        => 'post__in',
        ]);

        $result = [];
        foreach ($plates as $plate) {
            $result[] = $this->build_plate_payload($plate);
        }
        return $result;
    }

    /**
     * Get a user's managed plates (plates where user is moderator/author).
     *
     * @return array{owned:array,moderating:array}
     */
    public function get_user_managed_plates(int $user_id): array {
        $owned = [];
        $moderating = [];

        if (!$this->forum->is_plate_cpt_active()) {
            return ['owned' => $owned, 'moderating' => $moderating];
        }

        // Plates where user is author (超级版主)
        $own_plates = get_posts([
            'post_type'      => 'aksrt_forum_plate',
            'author'         => $user_id,
            'post_status'    => 'publish',
            'posts_per_page' => 50,
            'orderby'        => 'title',
            'order'          => 'ASC',
        ]);
        foreach ($own_plates as $plate) {
            $owned[] = $this->build_plate_payload($plate);
        }

        // Plates where user is a moderator (in _aksrt_moderators list)
        global $wpdb;
        $mod_plate_ids = $wpdb->get_col($wpdb->prepare(
            "SELECT pm.post_id FROM {$wpdb->postmeta} pm
             INNER JOIN {$wpdb->posts} p ON p.ID = pm.post_id AND p.post_type = 'aksrt_forum_plate' AND p.post_status = 'publish'
             WHERE pm.meta_key = '_aksrt_moderators'",
        ));

        foreach ($mod_plate_ids as $plate_id) {
            $plate_id = (int) $plate_id;
            // Skip plates already in owned
            if (in_array($plate_id, wp_list_pluck($own_plates, 'ID'), true)) {
                continue;
            }
            $mods = get_post_meta($plate_id, '_aksrt_moderators', true);
            if (is_array($mods) && in_array($user_id, $mods, true)) {
                $plate = get_post($plate_id);
                if ($plate) {
                    $moderating[] = $this->build_plate_payload($plate);
                }
            }
        }

        return ['owned' => $owned, 'moderating' => $moderating];
    }

    // ── Plate utilities (extracted from facade) ──

    public function increment_plate_views(int $plate_id): void {
        if ($plate_id <= 0 || !$this->forum->is_plate_cpt_active()) {
            return;
        }
        $views = (int) get_post_meta($plate_id, '_aksrt_views', true);
        update_post_meta($plate_id, '_aksrt_views', $views + 1);
    }

    /**
     * Check if a plate qualifies as "hot" (§7.2 热门版块).
     */
    public function is_hot_plate(int $plate_id): bool {
        $config = $this->forum->get_config();
        $threshold = (int) ($config['other']['hot_plate_threshold'] ?? 100);
        $posts_count = (int) get_post_meta($plate_id, '_aksrt_posts_count', true);
        $follow_count = (int) get_post_meta($plate_id, '_aksrt_follow_count', true);
        return ($posts_count + $follow_count * 2) >= $threshold;
    }

    /**
     * Get plate categories (分区) with moderators.
     */
    public function get_plate_categories(): array {
        $terms = get_terms([
            'taxonomy'   => 'aksrt_plate_cat',
            'hide_empty' => false,
            'orderby'    => 'name',
            'order'      => 'ASC',
        ]);

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

        $categories = [];
        foreach ($terms as $term) {
            $term_id = (int) $term->term_id;
            $moderator_ids = get_term_meta($term_id, '_aksrt_cat_moderator', true);
            if (!is_array($moderator_ids)) {
                $moderator_ids = [];
            }

            $categories[] = [
                'id'          => $term_id,
                'name'        => (string) $term->name,
                'description' => (string) $term->description,
                'slug'        => (string) $term->slug,
                'count'       => (int) $term->count,
                'parent_id'   => (int) $term->parent,
                'moderators'  => array_values(array_unique(array_filter(array_map('intval', $moderator_ids)))),
                'add_limit'   => (string) (get_term_meta($term_id, '_aksrt_add_limit', true) ?: 'all'),
                'url'         => (string) get_term_link($term),
            ];
        }

        return $categories;
    }
}