<?php

namespace app\common\Service\Pay;

use GuzzleHttp\Client;
use GuzzleHttp\Exception\RequestException;
use Psr\Http\Client\ClientInterface;
use Psr\Http\Client\ClientExceptionInterface;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;

/**
 * 本 HttpClient 主要为了解决 yansongda\pay Http 必须继承 ClientInterface 问题（fa 框架的 GuzzleHttp\client 为 6.* 未继承 psr ClientInterface
 * 也可直接将本类当作 GuzzleHttp\Client 使用
 */
class HttpClient implements ClientInterface
{
    /**
     * GuzzleHttp Client 实例
     * @var Client
     */
    protected $client;

    /**
     * 单例实例
     * @var HttpClient
     */
    private static $instance;

    /**
     * 构造函数
     * @param array $config
     */
    public function __construct(array $config = [])
    {
        $this->client = new Client($config);
    }

    /**
     * 获取单例实例
     * @param array $config
     * @return HttpClient
     */
    public static function instance(array $config = [])
    {
        if (!static::$instance instanceof static) {
            static::$instance = new static($config);
        }
        return static::$instance;
    }

    /**
     * 发送 PSR-7 请求并返回 PSR-7 响应
     * 
     * @param RequestInterface $request
     * @return ResponseInterface
     * @throws ClientExceptionInterface 如果发生错误且无法完成请求
     */
    public function sendRequest(RequestInterface $request): ResponseInterface
    {
        try {
            return $this->client->send($request);
        } catch (RequestException $e) {
            // 将 GuzzleHttp 异常转换为 PSR 客户端异常
            throw new class($e->getMessage(), $e->getCode(), $e) extends \RuntimeException implements ClientExceptionInterface {
                // PSR ClientExceptionInterface 实现
            };
        }
    }

    /**
     * 魔术方法，将其他方法调用代理到 GuzzleHttp Client
     * 使其能够当作 GuzzleHttp\Client 使用
     * 
     * @param string $method
     * @param array $arguments
     * @return mixed
     */
    public function __call($method, $arguments)
    {
        return $this->client->{$method}(...$arguments);
    }

    /**
     * 获取底层的 GuzzleHttp Client
     * @return Client
     */
    public function getClient()
    {
        return $this->client;
    }

    /**
     * 设置 GuzzleHttp Client
     * @param Client $client
     * @return $this
     */
    public function setClient(Client $client)
    {
        $this->client = $client;
        return $this;
    }
}