<?php

namespace App\Services;

use Illuminate\Support\Facades\Http;

class LinkosService
{
    const BASE_URL = 'http://service.easylinkin.com/api';

    /**
     * @param  string  $apiKey
     * @param  string  $apiSecret
     */
    public function __construct(
        protected readonly string $apiKey,
        protected readonly string $apiSecret,
    ) {
    }

    /**
     * 发起 GET 请求
     *
     * @param  string  $url
     * @param  array  $query
     * @return array
     */
    public function get(string $url, array $query = []): array
    {
        return $this->request('GET', $url, [
            'query' => $query,
        ]);
    }

    /**
     * 发起 POST 请求
     *
     * @param  string  $url
     * @param  array  $data
     * @return array
     */
    public function post(string $url, array $data = []): array
    {
        return $this->request('POST', $url, [
            'json' => $data,
            // 'form_params' => $data,
        ]);
    }

    /**
     * 发起 HTTP 请求
     *
     * @param  string  $method
     * @param  string  $url
     * @param  array  $options
     * @return array
     */
    protected function request(string $method, string $url, array $options = []): array
    {
        // 随机字符串
        $nonce = $this->nonce();
        // 毫秒时间戳
        $timestamp = now()->getTimestampMs();

        $options['headers'] = array_merge([
            'Content-Type' => 'application/json',
            'api-key' => $this->apiKey,
            'Nonce' => $nonce,
            'Timestamp' => $timestamp,
            'Signature' => $this->sign($nonce, $timestamp),
        ], $options['headers'] ?? []);

        $response = Http::baseUrl(static::BASE_URL)->send($method, $url, $options);

        // HTTP request returned status code 500: {"msg":"系统异常,接口调用失败","code":"default","success":false}
        $response->throw();

        return $response->json();
    }

    /**
     * 生成签名
     *
     * @param  string  $nonce
     * @param  int  $timestamp
     * @return string
     */
    public function sign(string $nonce, int $timestamp): string
    {
        return sha1($nonce.$timestamp.$this->apiSecret);
    }

    /**
     * @param  int  $length
     * @param  string  $charset
     * @return string
     */
    protected function nonce(int $length = 8, string $charset = '0123456789'): string
    {
        $max = strlen($charset) - 1;

        $nonce = '';

        for ($i = 0; $i < $length; $i++) {
            $nonce .= $charset[mt_rand(0, $max)];
        }

        return $nonce;
    }
}