<?php
/** .-------------------------------------------------------------------
 * | Software: [HDCMS framework]
 * | Site: www.hdcms.com
 * |-------------------------------------------------------------------
 * | Author: 向军 <2300071698@qq.com>
 * | WeChat: aihoudun
 * | Copyright (c) 2012-2019, www.houdunwang.com. All Rights Reserved.
 * '-------------------------------------------------------------------*/
namespace hdphp\cache;

use Exception;

/**
 * 文件缓存处理
 * Class File
 *
 * @package Hdphp\Cache
 * @author 向军 <2300071698@qq.com>
 */
class File implements InterfaceCache {

	//缓存目录
	private $dir = 'storage/cache';

	public function __construct() {
		$this->connect();
	}

	//连接
	public function connect() {
		if ( ! is_dir( $this->dir ) && ! mkdir( $this->dir, 0755, TRUE ) ) {
			throw new Exception( "缓存目录创建失败" );
		}
	}

	//设置缓存目录
	public function dir( $dir ) {
		if ( is_dir( $dir ) || mkdir( $dir, 0755, TRUE ) ) {
			$this->dir = $dir;
		}

		return $this;
	}

	//缓存文件
	private function getFile( $name ) {
		return $this->dir . '/' . md5( $name ) . ".php";
	}

	//设置
	public function set( $name, $data, $expire = 3600 ) {
		$file = $this->getFile( $name );

		//缓存时间
		$expire = sprintf( "%010d", $expire );

		$data = "<?php\n//" . $expire . serialize( $data ) . "\n?>";

		return file_put_contents( $file, $data );
	}

	//获取
	public function get( $name ) {
		$file = $this->getFile( $name );

		//缓存文件不存在
		if ( ! is_file( $file ) ) {
			return NULL;
		}

		$content = file_get_contents( $file );

		$expire = intval( substr( $content, 8, 10 ) );

		//修改时间
		$mtime = filemtime( $file );

		//缓存失效处理
		if ( $expire > 0 && $mtime + $expire < time() ) {
			return @unlink( $file );
		}

		return unserialize( substr( $content, 18, - 3 ) );
	}

	//删除
	public function del( $name ) {
		$file = $this->getFile( $name );

		return is_file( $file ) && unlink( $file );
	}

	//刷新缓存池
	public function flush() {
		return Dir::del( $this->dir );
	}
}