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public class AzureService : IAzureService
{
private readonly ArmClient _client;
private readonly SubscriptionResource _subscription;
private readonly ResourceGroupResource _resourceGroup;

public AzureService(string resourceGroupName)
{
_client = new ArmClient(new DefaultAzureCredential());
_subscription = _client.GetDefaultSubscription();
_resourceGroup = _subscription.GetResourceGroup(resourceGroupName);
}

public async Task AddSubdomainAsync(string appServiceName, string subdomain)
{
var appService = await GetAppServiceAsync(appServiceName);

var subdomainParts = subdomain.Split('.');
var subdomainName = string.Join('.', subdomainParts.Take(subdomainParts.Length - 2));
var txtRecordName = $"asuid.{subdomainName}";

var hostNameBindingData = new HostNameBindingData
{
SslState = HostNameBindingSslState.SniEnabled
};

var operation = await appService.GetSiteHostNameBindings().CreateOrUpdateAsync(WaitUntil.Completed, subdomain, hostNameBindingData);

// Add CNAME record
await AddCNameRecordAsync("pit-services.one", subdomainName, $"{appServiceName}.azurewebsites.net");

// Add TXT record for domain verification
await AddTxtRecordAsync("pit-services.one", txtRecordName, appService.Data.CustomDomainVerificationId);
}

public async Task AddCNameRecordAsync(string dnsZoneName, string recordSetName, string alias)
{
var dnsZone = await GetDnsZoneAsync(dnsZoneName);
var cnameRecordSetData = new DnsCnameRecordData
{
TtlInSeconds = 3600,
Cname = alias
};

var cnameRecordSet = await dnsZone.GetDnsCnameRecords().CreateOrUpdateAsync(WaitUntil.Completed, recordSetName, cnameRecordSetData);
}

public async Task AddTxtRecordAsync(string dnsZoneName, string recordSetName, string value)
{
var dnsZone = await GetDnsZoneAsync(dnsZoneName);
var txtRecordSetData = new DnsTxtRecordData
{
TtlInSeconds = 3600,
DnsTxtRecords = { new DnsTxtRecordInfo { Values = { value } } }
};

var txtRecordSet = await dnsZone.GetDnsTxtRecords().CreateOrUpdateAsync(WaitUntil.Completed, recordSetName, txtRecordSetData);
}

private async Task GetDnsZoneAsync(string dnsZoneName)
{
return await _resourceGroup.GetDnsZoneAsync(dnsZoneName);
}

public async Task GetAppServiceAsync(string appServiceName)
{
return await _resourceGroup.GetWebSiteAsync(appServiceName);
}
}