using System;
using System.Globalization;
using System.Linq;
using System.Threading.Tasks;
using BTCPayServer.Data;
using BTCPayServer.Filters;
using BTCPayServer.Payments;
using BTCPayServer.Services;
using Microsoft.AspNetCore.Mvc;
using NBitcoin;

namespace BTCPayServer.Controllers
{
    public partial class UIInvoiceController
    {
        public class FakePaymentRequest
        {
            public Decimal Amount { get; set; }
            public string CryptoCode { get; set; } = "BTC";
        }

        public class MineBlocksRequest
        {
            public int BlockCount { get; set; } = 1;
            public string CryptoCode { get; set; } = "BTC";
        }

        [HttpPost("i/{invoiceId}/test-payment")]
        [CheatModeRoute]
        public async Task<IActionResult> TestPayment(string invoiceId, FakePaymentRequest request, [FromServices] Cheater cheater)
        {
            var invoice = await _InvoiceRepository.GetInvoice(invoiceId);
            var store = await _StoreRepository.FindStore(invoice.StoreId);

            // TODO support altcoins, not just bitcoin - and make it work for LN-only invoices
            var isSats = request.CryptoCode.ToUpper(CultureInfo.InvariantCulture) == "SATS";
            var cryptoCode = isSats ? "BTC" : request.CryptoCode;
            var network = _NetworkProvider.GetNetwork<BTCPayNetwork>(cryptoCode);
            var paymentMethodId = new [] {store.GetDefaultPaymentId()}.Concat(store.GetEnabledPaymentIds(_NetworkProvider))
                .FirstOrDefault(p => p != null && p.CryptoCode == cryptoCode && p.PaymentType == PaymentTypes.BTCLike);
            var bitcoinAddressString = invoice.GetPaymentMethod(paymentMethodId).GetPaymentMethodDetails().GetPaymentDestination();
            var bitcoinAddressObj = BitcoinAddress.Create(bitcoinAddressString, network.NBitcoinNetwork);
            var amount = new Money(request.Amount, isSats ? MoneyUnit.Satoshi : MoneyUnit.BTC);

            try
            {
                var paymentMethod = invoice.GetPaymentMethod(paymentMethodId);
                var rate = paymentMethod.Rate;
                var txid = (await cheater.CashCow.SendToAddressAsync(bitcoinAddressObj, amount)).ToString();

                // TODO The value of totalDue is wrong. How can we get the real total due? invoice.Price is only correct if this is the 2nd payment, not for a 3rd or 4th payment. 
                var totalDue = invoice.Price;
                return Ok(new
                {
                    Txid = txid,
                    AmountRemaining = (totalDue - (amount.ToUnit(MoneyUnit.BTC) * rate)) / rate,
                    SuccessMessage = "Created transaction " + txid
                });
            }
            catch (Exception e)
            {
                return BadRequest(new
                {
                    ErrorMessage = e.Message,
                    AmountRemaining = invoice.Price
                });
            }
        }

        [HttpPost("i/{invoiceId}/mine-blocks")]
        [CheatModeRoute]
        public IActionResult MineBlock(string invoiceId, MineBlocksRequest request, [FromServices] Cheater cheater)
        {
            // TODO support altcoins, not just bitcoin
            var blockRewardBitcoinAddress = cheater.CashCow.GetNewAddress();
            try
            {
                if (request.BlockCount > 0)
                {
                    cheater.CashCow.GenerateToAddress(request.BlockCount, blockRewardBitcoinAddress);
                    return Ok(new
                    {
                        SuccessMessage = "Mined " + request.BlockCount + " blocks"
                    });
                }
                return BadRequest(new
                {
                    ErrorMessage = "Number of blocks should be > 0"
                });
            }
            catch (Exception e)
            {
                return BadRequest(new
                {
                    ErrorMessage = e.Message
                });
            }
        }

        [HttpPost("i/{invoiceId}/expire")]
        [CheatModeRoute]
        public async Task<IActionResult> TestExpireNow(string invoiceId, [FromServices] Cheater cheater)
        {
            try
            {
                await cheater.UpdateInvoiceExpiry(invoiceId, DateTimeOffset.Now);
                return Ok(new { SuccessMessage = "Invoice is now expired." });
            }
            catch (Exception e)
            {
                return BadRequest(new { ErrorMessage = e.Message });
            }
        }
    }
}