<?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\model;

use ywxapp\model\BaseModel;


class BlogCategory extends BaseModel
{

    // 设置数据表名
    protected $name = 'blog_category';

    // 设置主键
    protected $pk = 'id';

    // 自动写入时间戳
    protected $autoWriteTimestamp = 'int';
    protected $createTime = 'create_at';
    protected $updateTime = 'update_at';

    // 定义允许写入的字段
    protected $allowField = [
        'uid', 'pid', 'name', 'description', 'sort', 'status'
    ];

    // 设置字段类型
    protected $type = [
        'uid'       => 'int',
        'pid'       => 'int',
        'sort'      => 'int',
        'status'    => 'int',
        'create_at' => 'int',
        'update_at' => 'int'
    ];

    // 定义关联 - 文章
    
    public function articles()
    {
        return $this->hasMany(BlogArticle::class, 'cid');
    }

    // 定义关联 - 父级分类
    
    public function parent()
    {
        return $this->belongsTo(self::class, 'pid');
    }

    // 定义关联 - 子分类
    
    public function children()
    {
        return $this->hasMany(self::class, 'pid');
    }

    // 获取文章数量
    
    public function getArticleCount()
    {
        return $this->articles()->where('status', 1)->count();
    }

    // 检查分类是否可用
    
    public function isActive()
    {
        return $this->status === 1;
    }

    /**
     * 获取某会员「可用」的分类：自己创建的(uid=$uid) + 全局共享的(uid=0)
     * 用于会员中心写文章时的分类下拉。
     */
    public static function getAvailable(int $uid)
    {
        return self::where('status', 1)
            ->where(function ($query) use ($uid) {
                $query->where('uid', 0)->whereOr('uid', $uid);
            })
            ->order('sort', 'asc')
            ->select();
    }

    // 获取分类树形结构
    
    public static function getCategoryTree()
    {
        $categories = self::order('sort', 'asc')->select()->toArray();
        return self::buildTree($categories);
    }

    // 递归构建树形结构
    
    private static function buildTree($items, $parentId = 0)
    {
        $tree = [];
        foreach ($items as $item) {
            if (($item['pid'] ?? 0) == $parentId) {
                $children = self::buildTree($items, $item['id']);
                if ($children) {
                    $item['children'] = $children;
                }
                $tree[] = $item;
            }
        }
        return $tree;
    }
}