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

namespace AKSRT\Forum;

defined('ABSPATH') || exit;

class TopicService {
    use TopicServicePart1;
    use TopicServicePart2;
    use TopicServicePart3;
    use TopicServicePart4;


    private Forum $forum;

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

    // ================================================================
    // Topic CRUD
    // ================================================================

    /**
     * Update topic content and editable governance metadata.
     *
     * @return bool|\WP_Error
     */
    public function update_topic(int $topic_id, array $data) {
        $post = get_post($topic_id);
        if (!$post || $post->post_type !== 'aksrt_forum_topic') {
            return new \WP_Error('invalid_topic', __('帖子不存在', 'aksrt'));
        }

        $update = ['ID' => $topic_id];

        if (isset($data['title'])) {
            $title = sanitize_text_field((string) $data['title']);
            if ($title === '') {
                return new \WP_Error('empty_title', __('标题不能为空', 'aksrt'));
            }
            $update['post_title'] = $title;
        }

        if (isset($data['content'])) {
            $content = wp_kses_post((string) $data['content']);
            if ($content === '') {
                return new \WP_Error('empty_content', __('内容不能为空', 'aksrt'));
            }
            $update['post_content'] = $content;
        }

        if (isset($data['excerpt'])) {
            $update['post_excerpt'] = sanitize_textarea_field((string) $data['excerpt']);
        }

        $result = wp_update_post($update, true);
        if (is_wp_error($result)) {
            return $result;
        }

        if (isset($data['tags']) && is_array($data['tags'])) {
            $tags = array_values(array_filter(array_map('sanitize_text_field', $data['tags'])));
            wp_set_object_terms($topic_id, $tags, 'aksrt_forum_tag');
        }

        $this->save_topic_governance_meta($topic_id, $data);

        return true;
    }

    /**
     * Create topic.
     *
     * @return array<string,mixed>|\WP_Error
     */
    public function create_topic(int $user_id, array $data) {
        if ($user_id <= 0) {
            return new \WP_Error('not_logged_in', __('请先登录', 'aksrt'));
        }

        $board_id = (int) ($data['board_id'] ?? 0);
        $title = sanitize_text_field((string) ($data['title'] ?? ''));
        $content = wp_kses_post((string) ($data['content'] ?? ''));
        $visibility = sanitize_key((string) ($data['visibility'] ?? Forum::VISIBILITY_PUBLIC));
        $special_topic = sanitize_text_field((string) ($data['special_topic'] ?? ''));
        $tags = is_array($data['tags'] ?? null) ? $data['tags'] : [];
        $bbs_type = sanitize_key((string) ($data['bbs_type'] ?? Forum::BBS_TYPE_STANDARD));
        if (!in_array($bbs_type, [Forum::BBS_TYPE_STANDARD, Forum::BBS_TYPE_QUESTION], true)) {
            $bbs_type = Forum::BBS_TYPE_STANDARD;
        }

        if ($board_id <= 0 || $title === '' || $content === '') {
            return new \WP_Error('invalid_payload', __('请填写所有必填项', 'aksrt'));
        }

        // §7.3: Strip unauthorized media from content based on compose capabilities
        $content = $this->sanitize_topic_content($user_id, $content);

        $board_ok = $this->assert_board($board_id);
        if (is_wp_error($board_ok)) {
            return $board_ok;
        }

        if (!isset($this->get_visibility_map()[$visibility])) {
            $visibility = Forum::VISIBILITY_PUBLIC;
        }

        $can_publish = $this->can_user_publish_directly($user_id, $board_id);
        $post_status = $can_publish ? 'publish' : 'pending';
        $review_status = $can_publish ? Forum::REVIEW_APPROVED : Forum::REVIEW_PENDING;

        $post_id = wp_insert_post([
            'post_title' => $title,
            'post_content' => $content,
            'post_status' => $post_status,
            'post_author' => $user_id,
            'post_type' => 'aksrt_forum_topic',
        ], true);

        if (is_wp_error($post_id)) {
            return $post_id;
        }

        $this->attach_topic_to_board((int) $post_id, $board_id);

        $clean_tags = array_values(array_filter(array_map('sanitize_text_field', $tags)));
        if (count($clean_tags) > 5) {
            $clean_tags = array_slice($clean_tags, 0, 5);
        }
        if (!empty($clean_tags)) {
            wp_set_object_terms($post_id, $clean_tags, 'aksrt_forum_tag');
        }

        $topic_cat = sanitize_text_field((string) ($data['topic_cat'] ?? ''));
        if ($topic_cat !== '' && taxonomy_exists('aksrt_forum_topic_cat')) {
            wp_set_object_terms($post_id, [$topic_cat], 'aksrt_forum_topic_cat');
        }

        update_post_meta($post_id, '_aksrt_visibility', $visibility);
        update_post_meta($post_id, '_aksrt_review_status', $review_status);

        if ($visibility === Forum::VISIBILITY_CREDITS) {
            $credits_cost = max(0, (int) ($data['credits_cost'] ?? 0));
            update_post_meta($post_id, '_aksrt_credits_cost', $credits_cost);
            update_post_meta($post_id, '_aksrt_pay_credits', $credits_cost);
            if (isset($data['credits_vip1']) && (string) $data['credits_vip1'] !== '') {
                update_post_meta($post_id, '_aksrt_credits_vip1', max(0, (int) $data['credits_vip1']));
            }
            if (isset($data['credits_vip2']) && (string) $data['credits_vip2'] !== '') {
                update_post_meta($post_id, '_aksrt_credits_vip2', max(0, (int) $data['credits_vip2']));
            }
            update_post_meta($post_id, '_aksrt_pay_hide_part', !empty($data['pay_hide_part']) ? 1 : 0);
        }
        if ($visibility === Forum::VISIBILITY_PAY) {
            $pay_price = sanitize_text_field((string) ($data['pay_price'] ?? ''));
            update_post_meta($post_id, '_aksrt_pay_price', $pay_price);
            if (isset($data['pay_vip1_price']) && (string) $data['pay_vip1_price'] !== '') {
                $v1 = max(0, (float) $data['pay_vip1_price']);
                update_post_meta($post_id, '_aksrt_pay_vip1_price', $v1);
                update_post_meta($post_id, '_aksrt_pay_vip_price', $v1);
            }
            if (isset($data['pay_vip2_price']) && (string) $data['pay_vip2_price'] !== '') {
                update_post_meta($post_id, '_aksrt_pay_vip2_price', max(0, (float) $data['pay_vip2_price']));
            }
            update_post_meta($post_id, '_aksrt_pay_hide_part', !empty($data['pay_hide_part']) ? 1 : 0);
            update_post_meta($post_id, '_aksrt_topic_coupon_s', !empty($data['topic_coupon_s']) ? 1 : 0);
        }
        if ($visibility === Forum::VISIBILITY_ROLE) {
            $roles = isset($data['visibility_roles']) && is_array($data['visibility_roles'])
                ? array_map('sanitize_key', $data['visibility_roles']) : [];
            update_post_meta($post_id, '_aksrt_visibility_roles', $roles);
        }

        update_post_meta($post_id, '_aksrt_special_topic', $special_topic);
        // 置顶分级 0~3（§7.3）：新建主题默认不置顶。
        update_post_meta($post_id, '_aksrt_sticky', Forum::STICKY_NONE);
        update_post_meta($post_id, '_aksrt_featured', '0');
        update_post_meta($post_id, '_aksrt_locked', '0');
        update_post_meta($post_id, '_aksrt_views', 0);
        update_post_meta($post_id, '_aksrt_last_reply', (string) get_post_field('post_date', $post_id));
        update_post_meta($post_id, '_aksrt_bbs_type', $bbs_type);
        if ($bbs_type === Forum::BBS_TYPE_QUESTION) {
            update_post_meta($post_id, '_aksrt_question_status', Forum::QUESTION_UNSOLVED);
        }

        $this->save_cover_meta($post_id, $data);

        $vote_meta = $this->prepare_vote_meta($data);
        $this->save_vote_meta($post_id, $vote_meta);

        if ($post_status === 'publish') {
            $this->forum->sync_board_count($board_id);
        }

        if (class_exists('\AKSRT\Credits\Earn') && $post_status === 'publish') {
            do_action('aksrt_forum_topic_created', $user_id, $post_id);
        }

        if ($post_status === 'pending') {
            $this->forum->notify_topic_pending($post_id, $user_id);
        }

        return [
            'post_id' => $post_id,
            'message' => $post_status === 'publish'
                ? __('主题已发布', 'aksrt')
                : __('主题已提交审核，审核通过后对外展示', 'aksrt'),
            'redirect' => $post_status === 'publish'
                ? get_permalink($post_id)
                : add_query_arg('compose_status', 'pending', aksrt_get_forum_home_url()),
        ];
    }

    // ================================================================
    // Board / plate attachment helpers
    // ================================================================

    /**
     * Validate board_id as plate CPT post ID when plate is active, else taxonomy term.
     *
     * @return true|\WP_Error
     */
    private function assert_board(int $board_id, string $error_message = '') {
        if ($error_message === '') {
            $error_message = __('版块不存在', 'aksrt');
        }

        if ($board_id <= 0) {
            return new \WP_Error('invalid_board', $error_message);
        }

        if ($this->forum->is_plate_cpt_active()) {
            $post = get_post($board_id);
            if (!$post || $post->post_type !== 'aksrt_forum_plate' || $post->post_status !== 'publish') {
                return new \WP_Error('invalid_board', $error_message);
            }
            return true;
        }

        $board = get_term($board_id, 'aksrt_forum_board');
        if (!$board || is_wp_error($board)) {
            return new \WP_Error('invalid_board', $error_message);
        }

        return true;
    }

    /**
     * Attach a topic to a board.
     * Plate CPT active: store `_aksrt_plate_id` only (native association).
     * Otherwise: taxonomy term on aksrt_forum_board.
     */
    private function attach_topic_to_board(int $topic_id, int $board_id): void {
        if ($topic_id <= 0 || $board_id <= 0) {
            return;
        }

        if ($this->forum->is_plate_cpt_active()) {
            update_post_meta($topic_id, '_aksrt_plate_id', $board_id);
            return;
        }

        if (taxonomy_exists('aksrt_forum_board')) {
            wp_set_object_terms($topic_id, [$board_id], 'aksrt_forum_board');
        }
    }

    // ================================================================
    // Topic moderation
    // ================================================================
}