<?php

namespace App\Module\Transfer\Services;

use App\Module\Transfer\Models\TransferApp;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

/**
 * 外部API服务
 * 处理与外部应用的API交互
 */
class ExternalApiService
{
    /**
     * 创建转出订单
     *
     * @param TransferApp $app 应用配置
     * @param array $data 订单数据
     * @return array
     */
    public static function createOutOrder(TransferApp $app, array $data): array
    {
        try {
            if (empty($app->order_out_create_url)) {
                return ['success' => false, 'message' => '未配置转出创建API'];
            }

            // 添加签名
            $data['timestamp'] = time();
            $data['signature'] = self::generateSignature($data, $app);

            // 发送HTTP请求
            $response = Http::timeout(30)
                ->post($app->order_out_create_url, $data);

            if ($response->successful()) {
                $result = $response->json();

                Log::info('External API create out order success', [
                    'app_id' => $app->id,
                    'url' => $app->order_out_create_url,
                    'request' => $data,
                    'response' => $result
                ]);

                return [
                    'success' => true,
                    'data' => $result,
                    'message' => '创建成功'
                ];
            } else {
                $error = "HTTP {$response->status()}: {$response->body()}";

                Log::error('External API create out order failed', [
                    'app_id' => $app->id,
                    'url' => $app->order_out_create_url,
                    'error' => $error
                ]);

                return [
                    'success' => false,
                    'message' => $error
                ];
            }

        } catch (\Exception $e) {
            Log::error('External API create out order exception', [
                'app_id' => $app->id,
                'error' => $e->getMessage()
            ]);

            return [
                'success' => false,
                'message' => $e->getMessage()
            ];
        }
    }

    /**
     * 查询转出订单状态
     *
     * @param TransferApp $app 应用配置
     * @param string $outOrderId 外部订单ID
     * @return array
     */
    public static function queryOutOrder(TransferApp $app, string $outOrderId): array
    {
        try {
            if (empty($app->order_out_info_url)) {
                return ['success' => false, 'message' => '未配置转出查询API'];
            }

            $params = [
                'out_order_id' => $outOrderId,
                'timestamp' => time()
            ];
            $params['signature'] = self::generateSignature($params, $app);

            $response = Http::timeout(30)
                ->get($app->order_out_info_url, $params);

            if ($response->successful()) {
                $result = $response->json();

                return [
                    'success' => true,
                    'data' => $result,
                    'message' => '查询成功'
                ];
            } else {
                return [
                    'success' => false,
                    'message' => "HTTP {$response->status()}: {$response->body()}"
                ];
            }

        } catch (\Exception $e) {
            return [
                'success' => false,
                'message' => $e->getMessage()
            ];
        }
    }

    /**
     * 查询转入订单状态
     *
     * @param TransferApp $app 应用配置
     * @param string $outOrderId 外部订单ID
     * @return array
     */
    public static function queryInOrder(TransferApp $app, string $outOrderId): array
    {
        try {
            if (empty($app->order_in_info_url)) {
                return ['success' => false, 'message' => '未配置转入查询API'];
            }

            $params = [
                'out_order_id' => $outOrderId,
                'timestamp' => time()
            ];
            $params['signature'] = self::generateSignature($params, $app);

            $response = Http::timeout(30)
                ->get($app->order_in_info_url, $params);

            if ($response->successful()) {
                $result = $response->json();

                return [
                    'success' => true,
                    'data' => $result,
                    'message' => '查询成功'
                ];
            } else {
                return [
                    'success' => false,
                    'message' => "HTTP {$response->status()}: {$response->body()}"
                ];
            }

        } catch (\Exception $e) {
            return [
                'success' => false,
                'message' => $e->getMessage()
            ];
        }
    }

    /**
     * 发送回调通知
     *
     * @param TransferApp $app 应用配置
     * @param array $data 回调数据
     * @return array
     */
    public static function sendCallback(TransferApp $app, array $data): array
    {
        try {
            if (empty($app->order_callback_url)) {
                return ['success' => false, 'message' => '未配置回调URL'];
            }

            // 添加签名
            $data['signature'] = self::generateSignature($data, $app);

            $response = Http::timeout(30)
                ->post($app->order_callback_url, $data);

            if ($response->successful()) {
                $result = $response->json();

                Log::info('External API callback success', [
                    'app_id' => $app->id,
                    'url' => $app->order_callback_url,
                    'response' => $result
                ]);

                return [
                    'success' => true,
                    'data' => $result,
                    'message' => '回调成功'
                ];
            } else {
                $error = "HTTP {$response->status()}: {$response->body()}";

                Log::error('External API callback failed', [
                    'app_id' => $app->id,
                    'url' => $app->order_callback_url,
                    'error' => $error
                ]);

                return [
                    'success' => false,
                    'message' => $error
                ];
            }

        } catch (\Exception $e) {
            Log::error('External API callback exception', [
                'app_id' => $app->id,
                'error' => $e->getMessage()
            ]);

            return [
                'success' => false,
                'message' => $e->getMessage()
            ];
        }
    }

    /**
     * 生成API签名
     *
     * @param array $data 数据
     * @param TransferApp $app 应用配置
     * @return string
     */
    private static function generateSignature(array $data, TransferApp $app): string
    {
        // 移除signature字段
        unset($data['signature']);

        // 按key排序
        ksort($data);

        // 拼接字符串
        $string = '';
        foreach ($data as $key => $value) {
            if (is_array($value)) {
                $value = json_encode($value, JSON_UNESCAPED_UNICODE);
            }
            $string .= $key . '=' . $value . '&';
        }

        // 添加密钥（这里使用应用keyname作为密钥，实际项目中应该有专门的密钥字段）
        $string .= 'key=' . $app->keyname;

        // 生成MD5签名
        return md5($string);
    }

    /**
     * 验证API签名
     *
     * @param array $data 数据
     * @param TransferApp $app 应用配置
     * @return bool
     */
    public static function verifySignature(array $data, TransferApp $app): bool
    {
        $signature = $data['signature'] ?? '';
        $expectedSignature = self::generateSignature($data, $app);

        return hash_equals($expectedSignature, $signature);
    }
}