<?php
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// +----------------------------------------------------------------------
// | 全局缓存类
// +----------------------------------------------------------------------
namespace addons\cms\library;

use think\facade\Cache;

class Cache_factory
{
    protected static $instance = null;

    protected $cacheList = [
        'Category'   => [
            'name'   => '栏目索引',
            'model'  => 'Category',
            'action' => 'category_cache',
        ],
        'Model'      => [
            'name'   => '模型列表',
            'model'  => 'Models',
            'action' => 'model_cache',
        ],
        'ModelField' => [
            'name'   => '模型字段',
            'model'  => 'ModelField',
            'action' => 'model_field_cache',
        ],
    ];

    /**
     * @param 缓存实例化
     * @return static
     */
    public static function instance($options = [])
    {
        if (is_null(self::$instance)) {
            self::$instance = new self($options);
        }
        return self::$instance;
    }

    /**
     * 获取缓存
     * @param type $name 缓存名称
     * @return null
     */
    public function get($name)
    {
        $cache = Cache::get($name);
        if (!empty($cache)) {
            return $cache;
        } else {
            //尝试生成缓存
            return $this->runUpdate($name);
        }
        return null;
    }

    /**
     * 写入缓存
     * @param string $name 缓存变量名
     * @param type $value 存储数据
     * @param type $expire 有效时间（秒）
     * @return boolean
     */
    public function set($name, $value, $expire = null)
    {
        return Cache::tag('cms')->set($name, $value, $expire);
    }

    /**
     * 删除缓存
     * @param string $name 缓存变量名
     * @return boolean
     */
    public function remove($name)
    {
        return Cache::delete($name);
    }

    /**
     * 更新缓存
     * @param type $name 缓存key
     * @return boolean
     */
    public function runUpdate($name)
    {
        if (empty($name)) {
            return false;
        }
        //查询缓存key
        $cacheList = $this->cacheList;
        foreach ($cacheList as $k => $v) {
            $modelClass = "\\addons\\cms\\model\\{$v['model']}";
            $model      = new $modelClass;
            if ($v['action']) {
                $action = $v['action'];
                $model->$action(); //执行方法
            }
        }
        //再次加载
        return Cache::get($name);
    }

}