<?php
// +----------------------------------------------------------------------
// | YwxApp [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2026-2036 http://ywxapp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Author: ywxapp<admin@ywxapp.cn>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace addon\blog\controller;

use addon\blog\model\BlogArticle as ArticleModel;
use addon\blog\model\BlogComment as CommentModel;
use think\facade\Request;
use think\facade\View;
use think\facade\Session;
use think\facade\Db;

/**
 * Comment 类
 *
 * @author ywxapp <admin@ywxapp.cn>
 */
class Comment extends BlogFrontend
{
    /**
     * 公开访问（登录校验由方法内部通过 $this->auth 处理，会员统一以 uid 标识）
     * @var array
     */
    protected $noNeedLogin = ['*'];

    /**
     * 发表评论
     */
    public function add()
    {
        if (! $this->auth->isLogin) {
            return json(['code' => 0, 'msg' => '请先登录']);
        }
        $uid = $this->auth->model->uid;

        // 限流：同一用户 N 秒内只能发一条，防灌水/刷屏（0 = 不限）
        $interval = max(0, (int) config('blog.comment_interval', 10));
        if ($interval > 0 && \think\facade\Cache::get('blog_comment_lock:' . $uid)) {
            return json(['code' => 0, 'msg' => '评论太频繁，请稍后再试']);
        }

        $data = Request::post();

        $validate = new \think\Validate([
            'content|评论内容' => 'require|min:5|max:500',
            'article_id|文章ID' => 'require|number',
            'parent_id|父评论ID' => 'number'
        ]);

        if (!$validate->check($data)) {
            return json(['code' => 0, 'msg' => $validate->getError()]);
        }

        // 只能给「已发布 + 审核通过」的文章评论：
        // 否则草稿/待审/驳回文章会成为垃圾评论入口，也泄露未公开内容
        $article = ArticleModel::where('id', $data['article_id'])
            ->where('status', 1)
            ->where('audit_status', 2)
            ->find();
        if (!$article) {
            return json(['code' => 0, 'msg' => '文章不存在或不可评论']);
        }

        if ($data['parent_id'] > 0) {
            $parentComment = CommentModel::find($data['parent_id']);
            if (!$parentComment || $parentComment->aid != $data['article_id']) {
                return json(['code' => 0, 'msg' => '回复的评论不存在']);
            }
        }

        // 先做 HTML 白名单净化（防 XSS），再做敏感词替换
        $content = \addon\blog\library\HtmlSanitizer::clean((string) $data['content']);
        $sensitiveWords = ['垃圾', '广告', '违法', '政治'];
        $content = str_replace($sensitiveWords, '***', $content);

        $comment = new CommentModel();
        $comment->uid = $uid;
        $comment->aid = $data['article_id'];
        $comment->pid = $data['parent_id'] ?? 0;
        $comment->content = $content;
        // 评论审核：need_audit 开启时先审后发（0=待审核，见 install.sql 注释），否则直接显示
        $needAudit = (int) config('blog.need_audit');
        $comment->status = $needAudit ? 0 : 1;
        $comment->ip = Request::ip();
        $comment->user_agent = Request::server('HTTP_USER_AGENT');
        $comment->save();

        // 只有直接显示的评论才计数；待审核的等后台审核通过后再累加
        if (!$needAudit) {
            $article->comment_count = Db::raw('comment_count + 1');
            $article->save();
        }

        if ($interval > 0) {
            \think\facade\Cache::set('blog_comment_lock:' . $uid, 1, $interval);
        }

        return json([
            'code' => 1,
            'msg' => '评论发表成功',
            'data' => [
                'id' => $comment->id,
                'content' => $comment->content,
                'create_at' => $comment->create_text,
                // 前端渲染取 d.user.*，键名必须一致（原先返回 member，导致新评论显示 undefined）
                'user' => [
                    'uid' => $uid,
                    'nickname' => $this->auth->model->nickname,
                    'avatar' => $this->auth->model->avatar ?? '/static/images/avatar.png'
                ],
                // 保留 member 兼容旧前端
                'member' => [
                    'uid' => $uid,
                    'nickname' => $this->auth->model->nickname,
                    'avatar' => $this->auth->model->avatar ?? '/static/images/avatar.png'
                ],
                'parent_id' => $comment->pid
            ]
        ]);
    }

    /**
     * 删除评论
     */
    public function delete($id)
    {
        if (! $this->auth->isLogin) {
            return json(['code' => 0, 'msg' => '请先登录']);
        }
        $uid = $this->auth->model->uid;

        $comment = CommentModel::find($id);
        if (!$comment) {
            return json(['code' => 0, 'msg' => '评论不存在']);
        }

        if ($comment->uid != $uid) {
            return json(['code' => 0, 'msg' => '无权限操作']);
        }

        // 先统计将被删除的条数（含子评论），避免计数漂移（原先固定 -1）
        $deletedCount = $this->countWithChildren((int) $id);
        $this->deleteCommentWithChildren($id);

        $article = ArticleModel::find($comment->aid);
        if ($article) {
            $article->comment_count = Db::raw('comment_count - ' . max(1, $deletedCount));
            $article->save();
        }

        return json(['code' => 1, 'msg' => '评论已删除']);
    }

    /**
     * 递归统计评论及其子评论的条数
     */
    private function countWithChildren(int $id): int
    {
        $count = 1;
        $childIds = CommentModel::where('pid', $id)->column('id');
        foreach ($childIds as $childId) {
            $count += $this->countWithChildren((int) $childId);
        }
        return $count;
    }

    /**
     * 递归删除评论及其子评论
     */
    private function deleteCommentWithChildren($commentId)
    {
        $comment = CommentModel::find($commentId);
        if ($comment) {
            $children = CommentModel::where('pid', $commentId)->select();
            foreach ($children as $child) {
                $this->deleteCommentWithChildren($child->id);
            }
            $comment->delete();
        }
    }

    /**
     * 评论点赞
     */
    public function like($id)
    {
        if (! $this->auth->isLogin) {
            return json(['code' => 0, 'msg' => '请先登录']);
        }
        $uid = $this->auth->model->uid;

        $comment = CommentModel::find($id);
        if (!$comment) {
            return json(['code' => 0, 'msg' => '评论不存在']);
        }

        $likeKey = "comment_like_{$id}_{$uid}";
        if (Session::get($likeKey)) {
            Session::delete($likeKey);
            $comment->like_count = max(0, $comment->like_count - 1);
            $action = 'cancel';
        } else {
            Session::set($likeKey, true);
            $comment->like_count += 1;
            $action = 'add';
        }

        $comment->save();

        return json([
            'code' => 1,
            'msg' => $action == 'add' ? '点赞成功' : '已取消点赞',
            'count' => $comment->like_count,
            'action' => $action
        ]);
    }
}