<?php
/**
 * Forum REST controller.
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

class AKSRT_Admin_Forum_Controller extends AKSRT_Admin_Controller_Base {
    use AKSRT_Admin_Forum_Controller_Part_1;
    use AKSRT_Admin_Forum_Controller_Part_2;


    private static $instance = null;
    private $admin;

    public static function get_instance(): self {
        if (null === self::$instance) {
            self::$instance = new self();
        }

        return self::$instance;
    }

    public function set_admin(AKSRT_Admin $admin): void {
        $this->admin = $admin;
    }

    public function register_routes(): void {
        register_rest_route(self::API_NAMESPACE, '/forum/overview', [
            'methods' => 'GET',
            'callback' => [$this, 'get_overview'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/boards', [
            'methods' => 'GET',
            'callback' => [$this, 'get_boards'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/boards', [
            'methods' => 'POST',
            'callback' => [$this, 'create_board'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/boards/(?P<id>\d+)', [
            'methods' => 'POST',
            'callback' => [$this, 'update_board'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/boards/(?P<id>\d+)', [
            'methods' => 'DELETE',
            'callback' => [$this, 'delete_board'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/boards/reorder', [
            'methods' => 'POST',
            'callback' => [$this, 'reorder_boards'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/topics', [
            'methods' => 'GET',
            'callback' => [$this, 'get_topics'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/topics/(?P<id>\d+)', [
            'methods' => 'GET',
            'callback' => [$this, 'get_topic_detail'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/topics/(?P<id>\d+)/moderate', [
            'methods' => 'POST',
            'callback' => [$this, 'moderate_topic'],
            'permission_callback' => [$this, 'check_logged_in_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/topics/(?P<id>\d+)/vote', [
            'methods' => 'POST',
            'callback' => [$this, 'vote_topic'],
            'permission_callback' => [$this, 'check_logged_in_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/update-topic', [
            'methods' => 'POST',
            'callback' => [$this, 'update_topic_legacy'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/moderators', [
            'methods' => 'GET',
            'callback' => [$this, 'get_moderators'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/moderators', [
            'methods' => 'POST',
            'callback' => [$this, 'update_moderators'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        // Change moderator role
        register_rest_route(self::API_NAMESPACE, '/forum/moderators/role', [
            'methods' => 'POST',
            'callback' => [$this, 'change_moderator_role'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/moderator/apply', [
            'methods' => 'POST',
            'callback' => [$this, 'apply_moderator'],
            'permission_callback' => [$this, 'check_logged_in_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/moderator/applications', [
            'methods' => 'GET',
            'callback' => [$this, 'get_moderator_applications'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/moderator/applications/(?P<id>[A-Za-z0-9-]+)/review', [
            'methods' => 'POST',
            'callback' => [$this, 'review_moderator_application'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/topics/(?P<id>\d+)/favorite', [
            'methods' => 'POST',
            'callback' => [$this, 'toggle_favorite'],
            'permission_callback' => [$this, 'check_logged_in_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/topics/(?P<id>\d+)/score', [
            'methods' => 'POST',
            'callback' => [$this, 'score_topic'],
            'permission_callback' => [$this, 'check_logged_in_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/topics/(?P<id>\d+)/adopt', [
            'methods' => 'POST',
            'callback' => [$this, 'adopt_answer'],
            'permission_callback' => [$this, 'check_logged_in_permission'],
        ]);

        // §7.0 Plate CPT endpoints
        register_rest_route(self::API_NAMESPACE, '/forum/plates', [
            'methods' => 'GET',
            'callback' => [$this, 'get_plates'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/plates', [
            'methods' => 'POST',
            'callback' => [$this, 'create_plate'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/plates/(?P<id>\d+)', [
            'methods' => 'GET',
            'callback' => [$this, 'get_plate'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/plates/(?P<id>\d+)', [
            'methods' => 'POST',
            'callback' => [$this, 'update_plate'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/plates/(?P<id>\d+)', [
            'methods' => 'DELETE',
            'callback' => [$this, 'delete_plate'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/plates/reorder', [
            'methods' => 'POST',
            'callback' => [$this, 'reorder_plates'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        // §7.2 Follow plate
        register_rest_route(self::API_NAMESPACE, '/forum/plates/(?P<id>\d+)/follow', [
            'methods' => 'POST',
            'callback' => [$this, 'toggle_follow_plate'],
            'permission_callback' => [$this, 'check_logged_in_permission'],
        ]);

        // §7.2 Plate categories (分区)
        register_rest_route(self::API_NAMESPACE, '/forum/plate-categories', [
            'methods' => 'GET',
            'callback' => [$this, 'get_plate_categories'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        // §7.2 Sorted plates
        register_rest_route(self::API_NAMESPACE, '/forum/plates/sorted', [
            'methods' => 'GET',
            'callback' => [$this, 'get_sorted_plates'],
            'permission_callback' => '__return_true',
        ]);

        // §7.2 Front-end plate CRUD (forum admin/moderator)
        register_rest_route(self::API_NAMESPACE, '/forum/front/plates', [
            'methods' => 'POST',
            'callback' => [$this, 'frontend_create_plate'],
            'permission_callback' => [$this, 'check_logged_in_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/front/plates/(?P<id>\d+)', [
            'methods' => 'POST',
            'callback' => [$this, 'frontend_update_plate'],
            'permission_callback' => [$this, 'check_logged_in_permission'],
        ]);

        register_rest_route(self::API_NAMESPACE, '/forum/front/plates/(?P<id>\d+)', [
            'methods' => 'DELETE',
            'callback' => [$this, 'frontend_delete_plate'],
            'permission_callback' => [$this, 'check_logged_in_permission'],
        ]);
    }

    public function get_overview(): WP_REST_Response {
        $forum = $this->get_forum_service();
        if (!$forum) {
            return $this->success(['data' => ['stats' => [], 'boards' => [], 'recent_topics' => [], 'pending_applications' => []]]);
        }

        $pending_topics = $forum->get_topic_list([
            'limit' => 6,
            'status' => 'pending',
            'review_status' => AKSRT_Forum::REVIEW_PENDING,
            'viewer_user_id' => get_current_user_id(),
            'include_hidden' => true,
        ]);

        return $this->success([
            'data' => [
                'stats' => $forum->get_stats(),
                'boards' => array_slice($forum->get_boards(), 0, 6),
                'pending_topics' => $pending_topics['items'],
                'pending_applications' => array_slice($forum->get_moderator_application_list(['status' => AKSRT_Forum::APPLICATION_PENDING]), 0, 6),
            ],
        ]);
    }

    public function get_boards(): WP_REST_Response {
        $forum = $this->get_forum_service();
        $items = $forum ? $forum->get_boards() : [];

        return $this->success([
            'data' => [
                'items' => $items,
                'total' => count($items),
            ],
        ]);
    }

    public function create_board(WP_REST_Request $request): WP_REST_Response {
        $forum = $this->get_forum_service();
        if (!$forum) {
            return $this->error(__('论坛系统未启用', 'aksrt'));
        }

        $params = $this->get_json_params($request);
        $name = sanitize_text_field((string) ($params['name'] ?? ''));
        if ($name === '') {
            return $this->error(__('版块名称不能为空', 'aksrt'));
        }

        $term_id = $forum->create_board($params);
        if ($term_id <= 0) {
            return $this->error(__('创建版块失败', 'aksrt'));
        }

        return $this->success([
            'message' => __('版块已创建', 'aksrt'),
            'data' => ['id' => $term_id],
        ], 201);
    }

    public function update_board(WP_REST_Request $request): WP_REST_Response {
        $forum = $this->get_forum_service();
        if (!$forum) {
            return $this->error(__('论坛系统未启用', 'aksrt'));
        }

        $board_id = (int) $request->get_param('id');
        if ($board_id <= 0) {
            return $this->error(__('参数无效', 'aksrt'));
        }

        $success = $forum->update_board($board_id, $this->get_json_params($request));
        if (!$success) {
            return $this->error(__('版块更新失败', 'aksrt'));
        }

        return $this->success(['message' => __('版块已更新', 'aksrt')]);
    }

    public function delete_board(WP_REST_Request $request): WP_REST_Response {
        $forum = $this->get_forum_service();
        if (!$forum) {
            return $this->error(__('论坛系统未启用', 'aksrt'));
        }

        $board_id = (int) $request->get_param('id');
        if ($board_id <= 0) {
            return $this->error(__('参数无效', 'aksrt'));
        }

        $success = $forum->delete_board($board_id);
        if (!$success) {
            return $this->error(__('版块删除失败', 'aksrt'));
        }

        return $this->success(['message' => __('版块已删除', 'aksrt')]);
    }

    public function reorder_boards(WP_REST_Request $request): WP_REST_Response {
        $forum = $this->get_forum_service();
        if (!$forum) {
            return $this->error(__('论坛系统未启用', 'aksrt'));
        }

        $params = $this->get_json_params($request);
        $order = $params['order'] ?? [];
        if (!is_array($order) || empty($order)) {
            return $this->error(__('排序参数无效', 'aksrt'));
        }

        $forum->reorder_boards($order);

        return $this->success(['message' => __('排序已更新', 'aksrt')]);
    }

    // ================================================================
    // §7.0 Plate CPT handlers
    // ================================================================

    public function get_plates(WP_REST_Request $request): WP_REST_Response {
        $forum = $this->get_forum_service();
        if (!$forum) {
            return $this->success(['data' => ['items' => [], 'total' => 0]]);
        }

        $args = [];
        $parent = $request->get_param('parent');
        if ($parent !== null) {
            $args['parent'] = (int) $parent;
        }
        $plate_cat = $request->get_param('plate_cat');
        if ($plate_cat) {
            $args['plate_cat'] = (int) $plate_cat;
        }

        $items = $forum->get_plates($args);

        return $this->success([
            'data' => [
                'items' => $items,
                'total' => count($items),
            ],
        ]);
    }

    public function get_plate(WP_REST_Request $request): WP_REST_Response {
        $forum = $this->get_forum_service();
        if (!$forum) {
            return $this->error(__('论坛系统未启用', 'aksrt'));
        }

        $plate_id = (int) $request->get_param('id');
        $plate = $forum->get_plate($plate_id);
        if (!$plate) {
            return $this->error(__('版块不存在', 'aksrt'), 404);
        }

        return $this->success(['data' => $plate]);
    }

    public function create_plate(WP_REST_Request $request): WP_REST_Response {
        $forum = $this->get_forum_service();
        if (!$forum) {
            return $this->error(__('论坛系统未启用', 'aksrt'));
        }
        $params = $this->get_json_params($request);
        $name = sanitize_text_field((string) ($params['name'] ?? ''));
        if ($name === '') {
            return $this->error(__('版块名称不能为空', 'aksrt'));
        }

        $plate_id = $forum->create_plate($params);
        if ($plate_id <= 0) {
            return $this->error(__('创建版块失败', 'aksrt'));
        }

        return $this->success([
            'message' => __('版块已创建', 'aksrt'),
            'data' => ['id' => $plate_id],
        ], 201);
    }

}