<?php
namespace apiRes;

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

    private $default_states = [
        'success' => [
            'errno' => 0,
            'errmsg' => '操作成功！',
            'data' => []
        ],
        'error' => [
            'errno' => 2001,
            'errmsg' => '操作错误！',
            'data' => []
        ],
        'NoData' => [
            'errno' => 2002,
            'errmsg' => '没有数据！',
            'data' => []
        ],
        'NotLoggedIn' => [
            'errno' => 2003,
            'errmsg' => '未登录',
            'data' => []
        ]
    ];

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

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

    // 返回错误
    public static function error($msg='', $data=[], $to_array=false)
    {
        $ins = self::result('error');
        if ($msg) {
            $ins = $ins->message($msg);
        }

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

    // 返回成功
    public static function success($msg='', $data=[], $to_array=false)
    {
        $ins = self::result('success');
        if ($msg) {
            $ins = $ins->message($msg);
        }

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

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

    // 返回结果
    public function response($data=[], $to_array=false)
    {
        if (!empty($data)) {
            $this->state['data'] = $data;
        }
        if (request()->isJson() || $to_array) {
            $output = $this->state;
        } else {
            $output = json_encode($this->state, JSON_UNESCAPED_UNICODE);
        }
        return $output;
    }

    /**
     * 转成数组
     */
    public function toArray()
    {
        if (is_array($this->state)) {
            return $this->state;
        }
        return json_decode($this->state, true);
    }
}