<?php
namespace App\Api\Service;

use Illuminate\Support\Facades\Request;
use Illuminate\Support\Facades\Validator;

/**
 * API服务端总入口
 * @author Flc <2016-7-31 11:27:09>
 */
class Server
{
    /**
     * 请求参数
     * @var array
     */
    protected $params = [];

    /**
     * API请求Method名
     * @var string
     */
    protected $method;

    /**
     * app_id
     * @var string
     */
    protected $app_id;

    /**
     * app_secret
     * @var string
     */
    protected $app_secret;

    /**
     * 回调数据格式
     * @var string
     */
    protected $format = 'json';

    /**
     * 签名方法
     * @var string
     */
    protected $sign_method = 'md5';

    /**
     * 是否输出错误码
     * @var boolean
     */
    protected $error_code_show = false;

    /**
     * 初始化
     * @param Error $error Error对象
     */
    public function __construct(Error $error)
    {
        $this->params = Request::all();
        $this->error  = $error;
    }

    /**
     * api服务入口执行
     * @param  Request $request 请求参数
     * @return [type]           [description]
     */
    public function run($request)
    {
        // A.1 初步校验
        $rules    = [
            'app_id'      => 'required',
            'method'      => 'required',
            'format'      => 'in:,json',
            'sign_method' => 'in:,md5',
            'nonce'       => 'required|string|min:1|max:32|',
            'sign'        => 'required',
        ];
        $messages = [
            'app_id.required' => '1001',
            'method.required' => '1003',
            'format.in'       => '1004', 
            'sign_method.in'  => '1005', 
            'nonce.required'  => '1010',
            'nonce.string'    => '1011',
            'nonce.min'       => '1012',
            'nonce.max'       => '1012',
            'sign.required'   => '1006'
        ];

        $v = Validator::make($this->params, $rules, $messages);

        if ($v->fails()) {
            
            return $this->response(['status' => false, 'code' => $v->messages()->first()]);
        }

        // A.2 赋值对象
        $this->format      = !empty($this->params['format']) ? $this->params['format'] : $this->format;
        $this->sign_method = !empty($this->params['sign_method']) ? $this->params['sign_method'] : $this->sign_method;
        $this->app_id      = $this->params['app_id'];
        $this->method      = $this->params['method'];
        // B. appid校验
        $app = App::getInstance($this->app_id)->info();
        if (! $app) 
            return $this->response(['status' => false, 'code' => '1002']);

        $this->app_secret = $app->app_secret;
        // C. 校验签名
        $signRes = config('app.debug')?['status'=>true]:$this->checkSign($this->params);
        if (! $signRes || ! $signRes['status']) {
            return $this->response(['status' => false, 'code' => $signRes['code']]);
        }
        // D. 校验接口名
        // D.1 通过方法名获取类名
        $this->method=str_replace('.','\\',$this->method);
        $className = self::getClassName($this->method);

        // D.2 判断类名是否存在
        $classPath = __NAMESPACE__ . '\\Response\\' . $className;


        if (!$className || !class_exists($classPath)) {

            return $this->response(['status' => false, 'code' => '1008']);
        }

        // D.3 判断方法是否存在
        if (! method_exists($classPath, 'run')) {
            return $this->response(['status' => false, 'code' => '1009']);
        }

        $this->classname = $classPath;
        // X 如果有uid 要验证
        if(!empty($this->params['uid'])&&!empty($this->params['token'])&&!$this->checkToken($this->params['uid'],$this->params['token'])){
            return $this->response(['status' => false, 'code' => '1014']);
        }

        // E. api接口分发
        $class = new $classPath;
        return $this->response((array) $class->run($this->params,$request));
    }

    /**
     * 检查token和uid是否一致
     * @param $uid
     * @param $token
     * @return bool
     */
    protected function checkToken($uid,$token){
        if(md5(sha1($uid))==$token){
            return true;
        }
        return false;
    }
    /**
     * 校验签名
     * @param  [type] $params [description]
     * @return [type]         [description]
     */
    protected function checkSign($params)
    {
        $sign = array_key_exists('sign', $params) ? $params['sign'] : '';

        if (empty($sign))
            return array('status' => false, 'code' => '1006');

        unset($params['sign']);
        
        if ($sign != $this->generateSign($params)){
            info('pay error'.$params['method']);
           // return array('status' => false, 'code' => '1007');
        }

        return array('status' => true, 'code' => '200');
    }

    /**
     * 生成签名
     * @param  array $params 待校验签名参数
     * @return string|false 
     */
    protected function generateSign($params)
    {
        if ($this->sign_method == 'md5') 
            return $this->generateMd5Sign($params);

        return false;
    }

    /**
     * md5方式签名
     * @param  array $params 待签名参数
     * @return string         
     */
    protected function generateMd5Sign($params)
    {
        ksort($params);

        $tmps = array();
        foreach ($params as $k => $v) {
            $tmps[] = $k . $v;
        }

        $string = $this->app_secret . implode('', $tmps) . $this->app_secret;

        return strtoupper(md5($string));
    }


    /**
     * 通过方法名转换为对应的类名
     * @param  string $method 方法名
     * @return string|false         
     */
    protected function getClassName($method)
    {
        $methods = explode('.', $method);
        
        if (!is_array($methods))
            return false;

        $tmp = array();
        foreach ($methods as $value) {
            $tmp[] = ucwords($value);
        }

        $className = implode('', $tmp);
        return $className;
    }

    /**
     * 输出结果
     * @param  array $result 结果
     * @return response         
     */
    protected function response(array $result)
    {
        if (! array_key_exists('msg', $result) && array_key_exists('code', $result)) {
            $result['msg'] = $this->getError($result['code']);
        }

        if ($this->format == 'json') {
            return response()->json($result);
        }

        return false;        
    }

    /**
     * 返回错误内容
     * @param  string $code 错误码
     * @return string       
     */
    protected function getError($code)
    {
        return $this->error->getError($code, $this->error_code_show);
    }
}