<?php

namespace Modules\EcommerceFinance\Services\Jushuitan;

use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;
use RuntimeException;
use Throwable;

/**
 * 聚水潭（聚石塔 / 阿里巴巴奇门）开放平台客户端。
 *
 * 复刻工作平台 JSCrm 的鉴权与调用方式：
 *  - 基础参数：app_key, customerId, format, method, simplify, timestamp, v, sign
 *  - 签名（奇门 MD5）：MD5( secret + 依次拼接每个基础参数的 键名+键值(跳过 sign) + body + secret )，转大写十六进制
 *  - 发送：基础参数放 URL query，业务参数 body 作为 JSON 请求体
 *
 * 只读取数用途，带超时与重试。凭证来自 config('jushuitan')，缺失即拒绝请求。
 */
class QimenClient
{
    /** 参与签名的基础参数顺序，必须与工作平台 BaseRequestModel 声明顺序一致。 */
    private const SIGN_ORDER = ['app_key', 'customerId', 'format', 'method', 'simplify', 'timestamp', 'v'];

    public function __construct(private readonly array $config)
    {
    }

    public static function fromConfig(): self
    {
        return new self((array) config('jushuitan'));
    }

    /**
     * 调用一个奇门接口，返回解析后的数组。
     *
     * @param string $method 接口方法名，如 erp.sctrade.query
     * @param array  $body   业务参数
     * @return array 聚水潭返回的 JSON 解析结果
     */
    public function call(string $method, array $body): array
    {
        $this->assertConfigured();

        $bodyJson = json_encode($body, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        if ($bodyJson === false) {
            throw new RuntimeException('聚水潭请求体序列化失败。');
        }

        $baseParams = $this->baseParams($method);
        $baseParams['sign'] = $this->sign($baseParams, $bodyJson);

        $sync = $this->config['sync'] ?? [];
        $timeout = (int) ($sync['request_timeout'] ?? 30);
        $retries = max((int) ($sync['retry_times'] ?? 5), 1);
        $retrySleep = (int) ($sync['retry_sleep_ms'] ?? 1000);

        $response = Http::withOptions(['query' => $baseParams])
            ->withHeaders(['Content-Type' => 'application/json'])
            ->timeout($timeout)
            ->retry($retries, $retrySleep)
            ->withBody($bodyJson, 'application/json')
            ->post($this->gatewayUrl());

        if ($response->failed()) {
            Log::warning('聚水潭奇门接口 HTTP 失败。', ['method' => $method, 'status' => $response->status()]);
            throw new RuntimeException("聚水潭接口 {$method} 请求失败：HTTP {$response->status()}");
        }

        $data = $response->json();
        if (! is_array($data)) {
            throw new RuntimeException("聚水潭接口 {$method} 返回非 JSON。");
        }

        // 奇门通常以 code=0 / issuccess 标识成功，具体字段以实际返回为准，此处仅做基础校验。
        return $data;
    }

    /** @return array<string,string> */
    private function baseParams(string $method): array
    {
        return [
            'app_key'    => (string) ($this->config['app_key'] ?? ''),
            'customerId' => (string) ($this->config['customer_id'] ?? ''),
            'format'     => (string) ($this->config['format'] ?? 'json'),
            'method'     => $method,
            'simplify'   => (string) ($this->config['simplify'] ?? 'true'),
            'timestamp'  => now()->format('Y-m-d H:i:s'),
            'v'          => (string) ($this->config['version'] ?? '2'),
        ];
    }

    /**
     * 奇门 MD5 签名。等价于工作平台 ErpApiHelper.SignTopRequest：
     * raw = secret + Σ(key+value，按固定顺序，跳过 sign) + body + secret
     */
    private function sign(array $baseParams, string $bodyJson): string
    {
        $secret = (string) ($this->config['app_secret'] ?? '');
        $raw = $secret;
        foreach (self::SIGN_ORDER as $key) {
            $value = $baseParams[$key] ?? null;
            if ($value !== null && $value !== '') {
                $raw .= $key . $value;
            }
        }
        $raw .= $bodyJson . $secret;

        return strtoupper(md5($raw));
    }

    private function gatewayUrl(): string
    {
        $url = trim((string) ($this->config['gateway_url'] ?? ''));
        if ($url === '') {
            throw new RuntimeException('未配置聚水潭奇门网关地址（JST_QIMEN_URL）。');
        }

        return $url;
    }

    private function assertConfigured(): void
    {
        foreach (['app_key' => 'JST_APP_KEY', 'app_secret' => 'JST_APP_SECRET', 'customer_id' => 'JST_CUSTOMER_ID'] as $key => $env) {
            if (trim((string) ($this->config[$key] ?? '')) === '') {
                throw new RuntimeException("未配置聚水潭凭证 {$env}，已拒绝请求（不会同步任何数据）。");
            }
        }
    }
}