<?php
// +----------------------------------------------------------------------
// | TOPThink [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2011 http://topthink.com All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id$
namespace Think;
class Cookie {

    static protected $config    =   [
        'prefix'    =>  '', // cookie 名称前缀
        'expire'    =>  0, // cookie 保存时间
        'path'      =>  '/', // cookie 保存路径
        'domain'    =>  '', // cookie 有效域名        
    ];

    /**
     * Cookie初始化
     * @param array $config
     * @return void
     */
    static public function init($config=[]){
        self::$config     = array_merge(self::$config, array_change_key_case($config));
    }

    /**
     * 设置或者获取cookie作用域（前缀）
     * @param string $prefix
     * @return string|void
     */
    static public function prefix($prefix=''){
        if(empty($prefix)) {
            return self::$config['prefix'];
        }else{
            self::$config['prefix']   =   $prefix;
        }
    }

    /**
     * Cookie 设置、获取、删除
     * @param string $name cookie名称
     * @param mixed $value cookie值
     * @param mixed $options cookie参数
     * @return mixed
     */
    static public function set($name, $value='', $option=null) {
        // 参数设置(会覆盖黙认设置)
        if (!is_null($option)) {
            if (is_numeric($option))
                $option = array('expire' => $option);
            elseif (is_string($option))
                parse_str($option, $option);
            $config =   array_merge(self::$config, array_change_key_case($option));
        }else{
            $config =   self::$config;
        }
        $name = $config['prefix'] . $name;
        // 设置cookie
        if(is_array($value)){
            $value  = 'think:'.json_encode(array_map('urlencode',$value));
        }
        $expire = !empty($config['expire']) ? time() + intval($config['expire']) : 0;
        setcookie($name, $value, $expire, $config['path'], $config['domain']);
        $_COOKIE[$name] = $value;
    }

    /**
     * Cookie获取
     * @param string $name cookie名称
     * @param string $prefix cookie前缀
     * @return mixed
     */
    static public function get($name, $prefix='') {
        $prefix =   $prefix?$prefix:self::$config['prefix'];
        $name = $prefix . $name;
        if(isset($_COOKIE[$name])){
            $value =    $_COOKIE[$name];
            if(0===strpos($value,'think:')){
                $value  =   substr($value,6);
                return array_map('urldecode',json_decode($value,true));
            }else{
                return $value;
            }
        }else{
            return null;
        }
    }

    /**
     * Cookie删除
     * @param string $name cookie名称
     * @param string $prefix cookie前缀
     * @return mixed
     */
    static public function delete($name, $prefix='') {
        $prefix =   $prefix?$prefix:self::$config['prefix'];
        $name = $prefix . $name;
        setcookie($name, '', time() - 3600, self::$config['path'], self::$config['domain']);
        unset($_COOKIE[$name]); // 删除指定cookie
    }

    /**
     * Cookie清空
     * @param string $prefix cookie前缀
     * @return mixed
     */
    static public function clear($prefix='') {
        // 清除指定前缀的所有cookie
        if (empty($_COOKIE))
            return;
        // 要删除的cookie前缀，不指定则删除config设置的指定前缀
        $prefix = $prefix ? $prefix: self::$config['prefix'];
        if ($prefix) {// 如果前缀为空字符串将不作处理直接返回
            foreach ($_COOKIE as $key => $val) {
                if (0 === strpos($key, $prefix)) {
                    setcookie($key, '', time() - 3600, self::$config['path'], self::$config['domain']);
                    unset($_COOKIE[$key]);
                }
            }
        }else{
            unset($_COOKIE);
        }
        return;
    }
}