using System.Text.Json;
using SKIT.FlurlHttpClient.Wechat.TenpayV3;
using SKIT.FlurlHttpClient.Wechat.TenpayV3.Settings;
using Tiku.Application.Commerce;

namespace Tiku.Infrastructure.Commerce;

internal sealed class WechatPayProvider : IPaymentProvider
{
    public string Provider => PaymentProviders.WechatPay;

    public Task<CreatePaymentProviderResult> CreatePaymentAsync(
        PaymentProviderAccount account,
        CreatePaymentProviderRequest request,
        CancellationToken cancellationToken = default)
    {
        _ = BuildClient(account);
        throw new PaymentProviderException(
            "WeChat Pay SDK is configured; checkout call is enabled in the commerce checkout batch.",
            "wechat_pay_checkout_not_enabled");
    }

    public Task<PaymentNotificationResult> ParsePaymentNotificationAsync(
        PaymentProviderAccount account,
        PaymentNotificationRequest request,
        CancellationToken cancellationToken = default)
    {
        _ = BuildClient(account);
        throw new PaymentProviderException(
            "WeChat Pay SDK is configured; notification parsing is enabled in the notification batch.",
            "wechat_pay_notification_not_enabled");
    }

    private static WechatTenpayClient BuildClient(PaymentProviderAccount account)
    {
        var options = new WechatTenpayClientOptions
        {
            MerchantId = Required(account.ConfigPublic, "merchantId", "mchId", "mchid"),
            MerchantV3Secret = Required(account.SecretPayload, "apiV3Key", "merchantV3Secret"),
            MerchantCertificateSerialNumber = Required(account.ConfigPublic, "certificateSerialNumber", "serialNo"),
            MerchantCertificatePrivateKey = Required(account.SecretPayload, "privateKey", "merchantCertificatePrivateKey"),
            PlatformAuthScheme = PlatformAuthScheme.PublicKey,
            PlatformPublicKeyManager = new InMemoryPublicKeyManager()
        };

        return WechatTenpayClientBuilder.Create(options).Build();
    }

    private static string Required(JsonElement element, params string[] keys)
    {
        if (element.ValueKind == JsonValueKind.Object)
        {
            foreach (var key in keys)
            {
                if (element.TryGetProperty(key, out var property) &&
                    property.ValueKind == JsonValueKind.String &&
                    !string.IsNullOrWhiteSpace(property.GetString()))
                {
                    return property.GetString()!;
                }
            }
        }

        throw new PaymentProviderException(
            "WeChat Pay provider configuration is incomplete.",
            "wechat_pay_config_incomplete");
    }
}