<?php

namespace App\Services\Sstbc;

use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;
use RuntimeException;

class SstbcApiClient
{
    protected function baseUrl(): string
    {
        return rtrim((string) config('sstbc.base_url'), '/');
    }

    protected function timeout(): int
    {
        return max(5, (int) config('sstbc.http_timeout_seconds', 30));
    }

    public function getAccessToken(bool $forceRefresh = false): string
    {
        $cacheKey = 'sstbc_api_access_token';

        if ($forceRefresh) {
            Cache::forget($cacheKey);
        }

        return (string) Cache::remember($cacheKey, now()->addHours(23), function () {
            $username = (string) config('sstbc.username');
            $password = (string) config('sstbc.password');

            if ($username === '' || $password === '') {
                throw new RuntimeException('SSTBC API 账号未配置，请在 .env 中设置 SSTBC_API_USERNAME / SSTBC_API_PASSWORD');
            }

            $response = Http::timeout($this->timeout())
                ->acceptJson()
                ->post($this->baseUrl().'/api/admin/auth/login', [
                    'username' => $username,
                    'password' => $password,
                ]);

            if (! $response->successful()) {
                throw new RuntimeException('SSTBC 登录失败：'.$response->body());
            }

            $token = (string) ($response->json('access_token') ?? '');
            if ($token === '') {
                throw new RuntimeException('SSTBC 登录响应缺少 access_token');
            }

            return $token;
        });
    }

    /**
     * @param  array<string, mixed>  $params
     * @return array<string, mixed>
     */
    public function fetchCourses(array $params = []): array
    {
        return $this->requestCourses($params, false);
    }

    /**
     * @param  array<string, mixed>  $params
     * @return array<string, mixed>
     */
    protected function requestCourses(array $params, bool $retried): array
    {
        $token = $this->getAccessToken($retried);

        $query = array_merge([
            'page' => 1,
            'page_size' => 10,
            'sort_name' => 'start_date',
            'sort_type' => 'DESC',
            'show_relation' => ['type_detail'],
        ], $params);

        $response = Http::timeout($this->timeout())
            ->acceptJson()
            ->withToken($token)
            ->get($this->baseUrl().'/api/admin/courses/index', $query);

        if ($response->status() === 401 && ! $retried) {
            return $this->requestCourses($params, true);
        }

        if (! $response->successful()) {
            throw new RuntimeException('SSTBC 课程列表请求失败：'.$response->body());
        }

        /** @var array<string, mixed> $body */
        $body = $response->json() ?? [];

        return $body;
    }
}