[BotAuthentication]
public class MessagesController : ApiController
{
    /// <summary>
    /// POST: api/Messages
    /// Receive a message from a user and reply to it
    /// </summary>
    public async Task<Message> Post([FromBody]Message message)
    {
        if (message.Type == "Message")
        {
            // calculate something for us to return
            int length = (message.Text ?? string.Empty).Length;

            // return our reply to the user
            return message.CreateReplyMessage($"You sent {length} characters");
        }
        else
        {
            return HandleSystemMessage(message);
        }
    }

    private Message HandleSystemMessage(Message message)
    {
        if (message.Type == "Ping")
        {
            Message reply = message.CreateReplyMessage();
            reply.Type = "Ping";
            return reply;
        }
        else if (message.Type == "DeleteUserData")
        {
            // Implement user deletion here
            // If we handle user deletion, return a real message
        }
        else if (message.Type == "BotAddedToConversation")
        {
        }
        else if (message.Type == "BotRemovedFromConversation")
        {
        }
        else if (message.Type == "UserAddedToConversation")
        {
        }
        else if (message.Type == "UserRemovedFromConversation")
        {
        }
        else if (message.Type == "EndOfConversation")
        {
        }

        return null;
    }
}

[Serializable]
public class CardToCardTransfer
{
	[Prompt("Номер карты отправителя:")]
	[Describe("Номер карты, с которой Вы хотите перевести деньги")]
	public string SourceCardNumber;

	[Prompt("Номер карты получателя:")]
	[Describe("Номер карты, на которую Вы хотите перевести деньги")]
	public string DestinationCardNumber;

	[Prompt("VALID THRU (месяц):")]
	[Describe("VALID THRU (месяц)")]
	public Month ValidThruMonth;

	[Prompt("VALID THRU (год):")]
	[Describe("VALID THRU (год)")]
	[Numeric(2016, 2050)]
	public int ValidThruYear;

	[Prompt("CVV:")]
	[Describe("CVV (три цифры на обороте карточки)")]
	public string CVV;

	[Prompt("Сумма перевода (руб):")]
	[Describe("Сумма перевода (руб)")]
	public int Amount;

	[Prompt("Комиссия (руб):")]
	[Describe("Комиссия (руб)")]
	public double Fee;
}

 public static class CardToCardFormBuilder
{
	public static IForm<CardToCardTransfer> MakeForm()
	{
		FormBuilder<CardToCardTransfer> _order = new FormBuilder<CardToCardTransfer>(); 
		
		return _order
			.Message("Добро пожаловать в сервис перевода денег с карты на карту!")
			.Field(nameof(CardToCardTransfer.SourceCardNumber))
			.Field(nameof(CardToCardTransfer.ValidThruMonth))
			.Field(nameof(CardToCardTransfer.ValidThruYear))
			.Field(nameof(CardToCardTransfer.DestinationCardNumber), null, validateCard)
			.Field(nameof(CardToCardTransfer.CVV))
			.Field(nameof(CardToCardTransfer.Amount))                
			.OnCompletionAsync(async (context, cardTocardTransfer) =>
			{                    
				Debug.WriteLine("{0}", cardTocardTransfer);
			})
			.Build();
	}
}

public static class CardToCardFormBuilder
{
	public static IForm<CardToCardTransfer> MakeForm()
	{
		FormBuilder<CardToCardTransfer> _order = new FormBuilder<CardToCardTransfer>();
		
		ValidateAsyncDelegate<CardToCardTransfer> validateCard =
			async (state, value) =>
			{
				var cardNumber = value as string;
				string errorMessage;

				ValidateResult result = new ValidateResult();
				result.IsValid = CardValidator.IsCardValid(cardNumber, out errorMessage);
				result.Feedback = errorMessage;

				return result;
			};

		return _order
			.Message("Добро пожаловать в сервис перевода денег с карты на карту!")
			.Field(nameof(CardToCardTransfer.SourceCardNumber), null, validateCard)
			.Field(nameof(CardToCardTransfer.Fee), state => false)
			.Field(nameof(CardToCardTransfer.ValidThruMonth))
			.Field(nameof(CardToCardTransfer.ValidThruYear))
			.Field(nameof(CardToCardTransfer.DestinationCardNumber), null, validateCard)
			.Field(nameof(CardToCardTransfer.CVV))
			.Field(nameof(CardToCardTransfer.Amount), null,
			async (state, value) =>
			{
				int amount = int.Parse(value.ToString());

				var alfabankService = new AlfabankService();                    
				string auth = await alfabankService.AuthorizePartner();
				state.Fee = (double) await alfabankService.GetCommission(auth, state.SourceCardNumber, state.DestinationCardNumber, amount);                   

				ValidateResult result = new ValidateResult();
				result.IsValid = true;
				return result;
			})
			.Confirm("Вы хотите перевести {Amount} рублей с карты {SourceCardNumber} на карту {DestinationCardNumber}? Комиссия составит {Fee} рублей. (y/n)")
			.OnCompletionAsync(async (context, cardTocardTransfer) =>
			{                    
				Debug.WriteLine("{0}", cardTocardTransfer);
			})
			.Build();
	}
}

[BotAuthentication]
public class MessagesController : ApiController
{
	internal static IDialog<CardToCardTransfer> MakeRoot()
	{
		return Chain.From(() => FormDialog.FromForm(CardToCardFormBuilder.MakeForm))
			.Do(async (context, order) =>
			{
				try
				{
					var completed = await order;

					var alfaService = new AlfabankService();
					string expDate = completed.ValidThruYear.ToString() + ((int)completed.ValidThruMonth).ToString("D2");
					string confirmationUrl = await alfaService.TransferMoney(completed.SourceCardNumber, expDate, completed.CVV, completed.DestinationCardNumber, completed.Amount);

					await context.PostAsync($"Осталось только подтвердить платеж. Перейдите по адресу {confirmationUrl}");
				}
				catch (FormCanceledException<CardToCardTransfer> e)
				{
					string reply;
					if (e.InnerException == null)
					{
						reply = $"Вы прервали операцию, попробуем позже!";
					}
					else
					{
						reply = "Извините, произошла ошибка. Попробуйте позже.";
					}
					await context.PostAsync(reply);
				}
			});
	}

	/// <summary>
	/// POST: api/Messages
	/// Receive a message from a user and reply to it
	/// </summary>
	public async Task<Message> Post([FromBody]Message message)
	{
		if (message.Type == "Message")
		{
			return await Conversation.SendAsync(message, MakeRoot);
		}
		else
		{
			return HandleSystemMessage(message);
		}
	}