<?php
namespace apiret;

class Api
{
    private static $response;
    private $state = [];

    private $config = [
        'status_var' => 'status',
        'message_var' => 'message',
        'data_var' => 'data',
        'states' => [
            'success' => [
                'status' => 200,
                'message' => '操作成功！',
                'data' => []
            ],
            'error' => [
                'status' => 2001,
                'message' => '操作错误！',
                'data' => []
            ],
        ]
    ];

    private function __construct($errno)
    {
        isset($errno) || die('请确认返回类型!');
        $this->config = config('apiret');
        $this->state = $this->config['states'][$errno];
        return $this;
    }

    // 单例
	public static function result($errno): Api
    {
		if (!self::$response) {
			self::$response = new self($errno);
		}
        return self::$response;
	}

    // 写入返回信息
    public function message($message=''): Api
    {
        $message ? $this->state[$this->config['message_var']] = $message : '';
        return $this;
    }

    // 返回错误
    public static function error($msg='', $data=[], $status_code = 200): \think\response\Json
    {
        $ins = self::result('error');
        if ($msg) {
            $ins = $ins->message($msg);
        }

        return $ins->response($data, $status_code);
    }

    // 返回成功
    public static function success($msg='', $data=[], $status_code = 200): \think\response\Json
    {
        $ins = self::result('success');
        if ($msg) {
            $ins = $ins->message($msg);
        }

        return $ins->response($data, $status_code);
    }

    // 返回结果
    public function response($data=[], $status_code = 200): \think\response\Json
    {
        $this->state[$this->config['data_var']] = $data;
        return \think\Response::create($this->state, 'json', $status_code);
    }
}