<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2015 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think\controller;

abstract class rest {

    protected   $_method    =   ''; // 当前请求类型
    protected   $_type      =   ''; // 当前资源类型
    // 输出类型
    protected   $restMethodList           =   'get|post|put|delete';
    protected   $restDefaultMethod        =   'get';
    protected   $restTypeList             =   'html|xml|json|rss';
    protected   $restDefaultType          =   'html';
    protected   $restOutputType           =   [ // REST允许输出的资源类型列表
            'xml'   =>  'application/xml',
            'json'  =>  'application/json',
            'html'  =>  'text/html',
        ];
    
   /**
     * 架构函数 取得模板对象实例
     * @access public
     */
    public function __construct() {
        // 资源类型检测
        if(''==__EXT__) { // 自动检测资源类型
            $this->_type   =  $this->getAcceptType();
        }elseif(!preg_match('/\('.$this->restTypeList.')$/i',__EXT__)) {
            // 资源类型非法 则用默认资源类型访问
            $this->_type   =  $this->restDefaultType;
        }else{
            $this->_type   =  __EXT__;
        }
        // 请求方式检测
        $method  =  strtolower($_SERVER['REQUEST_METHOD']);
        if(false === stripos($this->restMethodList,$method)) {
            // 请求方式非法 则用默认请求方法
            $method = $this->restDefaultMethod;
        }
        $this->_method = $method;
    }

    /**
     * REST 调用
     * @access public
     * @param string $method 方法名
     * @param array $args 参数
     * @return mixed
     */
    public function _empty($method,$args) {
        if(method_exists($this,$method.'_'.$this->_method.'_'.$this->_type)) { // RESTFul方法支持
            $fun  =  $method.'_'.$this->_method.'_'.$this->_type;
        }elseif($this->_method == $this->restDefaultMethod && method_exists($this,$method.'_'.$this->_type) ){
            $fun  =  $method.'_'.$this->_type;
        }elseif($this->_type == $this->restDefaultType && method_exists($this,$method.'_'.$this->_method) ){
            $fun  =  $method.'_'.$this->_method;
        }
        if(isset($fun)) {
            $this->$fun();
        }else{
            // 抛出异常
            throw new \think\Exception(L('_ERROR_ACTION_:').ACTION_NAME);
        }
    }

    /**
     * 输出返回数据
     * @access protected
     * @param mixed $data 要返回的数据
     * @param String $type 返回类型 JSON XML
     * @param integer $code HTTP状态
     * @return void
     */
    protected function response($data,$type='',$code=200) {
        Response::sendHttpStatus($code);
        Response::returnData($data,strtolower($type)));
    }

    /**
     * 获取当前请求的Accept头信息
     * @return string
     */
    static public function getAcceptType(){
        $type = [
            'html'  =>  'text/html,application/xhtml+xml,*/*',
            'xml'   =>  'application/xml,text/xml,application/x-xml',
            'json'  =>  'application/json,text/x-json,application/jsonrequest,text/json',
            'js'    =>  'text/javascript,application/javascript,application/x-javascript',
            'css'   =>  'text/css',
            'rss'   =>  'application/rss+xml',
            'yaml'  =>  'application/x-yaml,text/yaml',
            'atom'  =>  'application/atom+xml',
            'pdf'   =>  'application/pdf',
            'text'  =>  'text/plain',
            'png'   =>  'image/png',
            'jpg'   =>  'image/jpg,image/jpeg,image/pjpeg',
            'gif'   =>  'image/gif',
            'csv'   =>  'text/csv'
        ];
        
        foreach($type as $key=>$val){
            $array   =  explode(',',$val);
            foreach($array as $k=>$v){
                if(stristr($_SERVER['HTTP_ACCEPT'], $v)) {
                    return $key;
                }
            }
        }
        return false;
    }
}