public void BuildTransactionFeeTooLowThrowsWalletException()
        {
            Assert.Throws <WalletException>(() =>
            {
                var walletFeePolicy = new Mock <IWalletFeePolicy>();
                walletFeePolicy.Setup(w => w.GetFeeRate(FeeType.Low.ToConfirmations()))
                .Returns(new FeeRate(0));

                var wallet          = WalletTestsHelpers.GenerateBlankWallet("myWallet1", "password");
                var accountKeys     = WalletTestsHelpers.GenerateAccountKeys(wallet, "password", "m/44'/0'/0'");
                var spendingKeys    = WalletTestsHelpers.GenerateAddressKeys(wallet, accountKeys.ExtPubKey, "0/0");
                var destinationKeys = WalletTestsHelpers.GenerateAddressKeys(wallet, accountKeys.ExtPubKey, "0/1");
                var changeKeys      = WalletTestsHelpers.GenerateAddressKeys(wallet, accountKeys.ExtPubKey, "1/0");

                var address = new HdAddress
                {
                    Index        = 0,
                    HdPath       = $"m/44'/0'/0'/0/0",
                    Address      = spendingKeys.Address.ToString(),
                    Pubkey       = spendingKeys.PubKey.ScriptPubKey,
                    ScriptPubKey = spendingKeys.Address.ScriptPubKey,
                    Transactions = new List <TransactionData>()
                };

                var chain = new ConcurrentChain(wallet.Network);
                WalletTestsHelpers.AddBlocksWithCoinbaseToChain(wallet.Network, chain, address);

                wallet.AccountsRoot.ElementAt(0).Accounts.Add(new HdAccount
                {
                    Index             = 0,
                    Name              = "account1",
                    HdPath            = "m/44'/0'/0'",
                    ExtendedPubKey    = accountKeys.ExtPubKey,
                    ExternalAddresses = new List <HdAddress> {
                        address
                    },
                    InternalAddresses = new List <HdAddress>
                    {
                        new HdAddress {
                            Index        = 0,
                            HdPath       = $"m/44'/0'/0'/1/0",
                            Address      = changeKeys.Address.ToString(),
                            Pubkey       = changeKeys.PubKey.ScriptPubKey,
                            ScriptPubKey = changeKeys.Address.ScriptPubKey,
                            Transactions = new List <TransactionData>()
                        }
                    }
                });

                var dataDir       = "TestData/WalletTransactionHandlerTest/BuildTransactionFeeTooLowThrowsWalletException";
                var walletManager = new WalletManager(this.LoggerFactory.Object, Network.Main, chain, NodeSettings.Default(), new Mock <WalletSettings>().Object,
                                                      new DataFolder(new NodeSettings(args: new string[] { $"-datadir={dataDir}" }).DataDir), walletFeePolicy.Object, new Mock <IAsyncLoopFactory>().Object, new NodeLifetime(), DateTimeProvider.Default);
                var walletTransactionHandler = new WalletTransactionHandler(this.LoggerFactory.Object, walletManager, walletFeePolicy.Object, Network.Main);

                walletManager.Wallets.Add(wallet);

                var walletReference = new WalletAccountReference
                {
                    AccountName = "account1",
                    WalletName  = "myWallet1"
                };

                walletTransactionHandler.BuildTransaction(CreateContext(walletReference, "password", destinationKeys.PubKey.ScriptPubKey, new Money(7500), FeeType.Low, 0));
            });
        }
        public void FundTransaction_Given__a_wallet_has_enough_inputs__When__adding_inputs_to_an_existing_transaction__Then__the_transaction_is_funded_successfully()
        {
            DataFolder dataFolder = CreateDataFolder(this);

            var wallet           = WalletTestsHelpers.GenerateBlankWallet("myWallet1", "password");
            var accountKeys      = WalletTestsHelpers.GenerateAccountKeys(wallet, "password", "m/44'/0'/0'");
            var spendingKeys     = WalletTestsHelpers.GenerateAddressKeys(wallet, accountKeys.ExtPubKey, "0/0");
            var destinationKeys1 = WalletTestsHelpers.GenerateAddressKeys(wallet, accountKeys.ExtPubKey, "0/1");
            var destinationKeys2 = WalletTestsHelpers.GenerateAddressKeys(wallet, accountKeys.ExtPubKey, "0/2");
            var destinationKeys3 = WalletTestsHelpers.GenerateAddressKeys(wallet, accountKeys.ExtPubKey, "0/3");

            var address = new HdAddress
            {
                Index        = 0,
                HdPath       = $"m/44'/0'/0'/0/0",
                Address      = spendingKeys.Address.ToString(),
                Pubkey       = spendingKeys.PubKey.ScriptPubKey,
                ScriptPubKey = spendingKeys.Address.ScriptPubKey,
                Transactions = new List <TransactionData>()
            };

            // wallet with 4 coinbase outputs of 50 = 200 Bitcoin
            var chain = new ConcurrentChain(wallet.Network);

            WalletTestsHelpers.AddBlocksWithCoinbaseToChain(wallet.Network, chain, address, 4);

            wallet.AccountsRoot.ElementAt(0).Accounts.Add(new HdAccount
            {
                Index             = 0,
                Name              = "account1",
                HdPath            = "m/44'/0'/0'",
                ExtendedPubKey    = accountKeys.ExtPubKey,
                ExternalAddresses = new List <HdAddress> {
                    address
                },
                InternalAddresses = new List <HdAddress>()
            });

            var walletFeePolicy = new Mock <IWalletFeePolicy>();

            walletFeePolicy.Setup(w => w.GetFeeRate(FeeType.Low.ToConfirmations())).Returns(new FeeRate(20000));
            var overrideFeeRate = new FeeRate(20000);

            var walletManager = new WalletManager(this.LoggerFactory.Object, Network.Main, chain, NodeSettings.Default(), new Mock <WalletSettings>().Object,
                                                  dataFolder, walletFeePolicy.Object, new Mock <IAsyncLoopFactory>().Object, new NodeLifetime(), DateTimeProvider.Default);
            var walletTransactionHandler = new WalletTransactionHandler(this.LoggerFactory.Object, walletManager, walletFeePolicy.Object, Network.Main);

            walletManager.Wallets.Add(wallet);

            var walletReference = new WalletAccountReference
            {
                AccountName = "account1",
                WalletName  = "myWallet1"
            };

            // create a trx with 3 outputs 50 + 50 + 49 = 149 BTC
            var context = new TransactionBuildContext(walletReference,
                                                      new[]
            {
                new Recipient {
                    Amount = new Money(50, MoneyUnit.BTC), ScriptPubKey = destinationKeys1.PubKey.ScriptPubKey
                },
                new Recipient {
                    Amount = new Money(50, MoneyUnit.BTC), ScriptPubKey = destinationKeys2.PubKey.ScriptPubKey
                },
                new Recipient {
                    Amount = new Money(49, MoneyUnit.BTC), ScriptPubKey = destinationKeys3.PubKey.ScriptPubKey
                }
            }
                                                      .ToList(), "password")
            {
                MinConfirmations = 0,
                FeeType          = FeeType.Low
            };

            var fundTransaction = walletTransactionHandler.BuildTransaction(context);

            Assert.Equal(3, fundTransaction.Inputs.Count);  // 3 inputs
            Assert.Equal(4, fundTransaction.Outputs.Count); // 3 outputs with change

            // remove the change output
            fundTransaction.Outputs.Remove(fundTransaction.Outputs.First(f => f.ScriptPubKey == context.ChangeAddress.ScriptPubKey));
            // remove 2 inputs they will be added back by fund transaction
            fundTransaction.Inputs.RemoveAt(2);
            fundTransaction.Inputs.RemoveAt(1);
            Assert.Single(fundTransaction.Inputs); // 3 inputs

            var fundTransactionClone = fundTransaction.Clone();
            var fundContext          = new TransactionBuildContext(walletReference, new List <Recipient>(), "password")
            {
                MinConfirmations = 0,
                FeeType          = FeeType.Low
            };

            fundContext.OverrideFeeRate = overrideFeeRate;
            walletTransactionHandler.FundTransaction(fundContext, fundTransaction);

            foreach (var input in fundTransactionClone.Inputs) // all original inputs are still in the trx
            {
                Assert.Contains(fundTransaction.Inputs, a => a.PrevOut == input.PrevOut);
            }

            Assert.Equal(3, fundTransaction.Inputs.Count);  // we expect 3 inputs
            Assert.Equal(4, fundTransaction.Outputs.Count); // we expect 4 outputs
            Assert.Equal(new Money(150, MoneyUnit.BTC) - fundContext.TransactionFee, fundTransaction.TotalOut);

            Assert.Contains(fundTransaction.Outputs, a => a.ScriptPubKey == destinationKeys1.PubKey.ScriptPubKey);
            Assert.Contains(fundTransaction.Outputs, a => a.ScriptPubKey == destinationKeys2.PubKey.ScriptPubKey);
            Assert.Contains(fundTransaction.Outputs, a => a.ScriptPubKey == destinationKeys3.PubKey.ScriptPubKey);
        }
        public void EstimateFeeWithLowFeeMatchesBuildTxLowFee()
        {
            var dataFolder = CreateDataFolder(this);

            Wallet wallet          = WalletTestsHelpers.GenerateBlankWallet("myWallet1", "password");
            var    accountKeys     = WalletTestsHelpers.GenerateAccountKeys(wallet, "password", "m/44'/0'/0'");
            var    spendingKeys    = WalletTestsHelpers.GenerateAddressKeys(wallet, accountKeys.ExtPubKey, "0/0");
            var    destinationKeys = WalletTestsHelpers.GenerateAddressKeys(wallet, accountKeys.ExtPubKey, "0/1");

            HdAddress address = new HdAddress
            {
                Index        = 0,
                HdPath       = $"m/44'/0'/0'/0/0",
                Address      = spendingKeys.Address.ToString(),
                Pubkey       = spendingKeys.PubKey.ScriptPubKey,
                ScriptPubKey = spendingKeys.Address.ScriptPubKey,
                Transactions = new List <TransactionData>()
            };

            ConcurrentChain chain = new ConcurrentChain(wallet.Network);

            WalletTestsHelpers.AddBlocksWithCoinbaseToChain(wallet.Network, chain, address);
            TransactionData addressTransaction = address.Transactions.First();

            wallet.AccountsRoot.ElementAt(0).Accounts.Add(new HdAccount
            {
                Index             = 0,
                Name              = "account1",
                HdPath            = "m/44'/0'/0'",
                ExtendedPubKey    = accountKeys.ExtPubKey,
                ExternalAddresses = new List <HdAddress> {
                    address
                },
                InternalAddresses = new List <HdAddress>()
            });

            var walletFeePolicy = new Mock <IWalletFeePolicy>();

            walletFeePolicy.Setup(w => w.GetFeeRate(FeeType.Low.ToConfirmations()))
            .Returns(new FeeRate(20000));

            var walletManager = new WalletManager(this.LoggerFactory.Object, Network.Main, chain, NodeSettings.Default(), new Mock <WalletSettings>().Object,
                                                  dataFolder, walletFeePolicy.Object, new Mock <IAsyncLoopFactory>().Object, new NodeLifetime(), DateTimeProvider.Default);
            WalletTransactionHandler walletTransactionHandler = new WalletTransactionHandler(this.LoggerFactory.Object, walletManager, walletFeePolicy.Object, Network.Main);

            walletManager.Wallets.Add(wallet);

            WalletAccountReference walletReference = new WalletAccountReference
            {
                AccountName = "account1",
                WalletName  = "myWallet1"
            };

            // Context to build requires password in order to sign transaction.
            TransactionBuildContext buildContext = CreateContext(walletReference, "password", destinationKeys.PubKey.ScriptPubKey, new Money(7500), FeeType.Low, 0);

            walletTransactionHandler.BuildTransaction(buildContext);

            // Context for estimate does not need password.
            TransactionBuildContext estimateContext = CreateContext(walletReference, null, destinationKeys.PubKey.ScriptPubKey, new Money(7500), FeeType.Low, 0);
            Money fee = walletTransactionHandler.EstimateFee(estimateContext);

            Assert.Equal(fee, buildContext.TransactionFee);
        }
        public void BuildTransactionNoChangeAdressesLeftCreatesNewChangeAddress()
        {
            DataFolder dataFolder = CreateDataFolder(this);

            var wallet          = WalletTestsHelpers.GenerateBlankWallet("myWallet1", "password");
            var accountKeys     = WalletTestsHelpers.GenerateAccountKeys(wallet, "password", "m/44'/0'/0'");
            var spendingKeys    = WalletTestsHelpers.GenerateAddressKeys(wallet, accountKeys.ExtPubKey, "0/0");
            var destinationKeys = WalletTestsHelpers.GenerateAddressKeys(wallet, accountKeys.ExtPubKey, "0/1");

            var address = new HdAddress
            {
                Index        = 0,
                HdPath       = $"m/44'/0'/0'/0/0",
                Address      = spendingKeys.Address.ToString(),
                Pubkey       = spendingKeys.PubKey.ScriptPubKey,
                ScriptPubKey = spendingKeys.Address.ScriptPubKey,
                Transactions = new List <TransactionData>()
            };

            var chain = new ConcurrentChain(wallet.Network);

            WalletTestsHelpers.AddBlocksWithCoinbaseToChain(wallet.Network, chain, address);
            var addressTransaction = address.Transactions.First();

            wallet.AccountsRoot.ElementAt(0).Accounts.Add(new HdAccount
            {
                Index             = 0,
                Name              = "account1",
                HdPath            = "m/44'/0'/0'",
                ExtendedPubKey    = accountKeys.ExtPubKey,
                ExternalAddresses = new List <HdAddress> {
                    address
                },
                InternalAddresses = new List <HdAddress>()
            });

            var walletFeePolicy = new Mock <IWalletFeePolicy>();

            walletFeePolicy.Setup(w => w.GetFeeRate(FeeType.Low.ToConfirmations()))
            .Returns(new FeeRate(20000));

            var walletManager = new WalletManager(this.LoggerFactory.Object, Network.Main, chain, NodeSettings.Default(), new Mock <WalletSettings>().Object, dataFolder,
                                                  walletFeePolicy.Object, new Mock <IAsyncLoopFactory>().Object, new NodeLifetime(), DateTimeProvider.Default);
            var walletTransactionHandler = new WalletTransactionHandler(this.LoggerFactory.Object, walletManager, walletFeePolicy.Object, Network.Main);

            walletManager.Wallets.Add(wallet);

            var walletReference = new WalletAccountReference
            {
                AccountName = "account1",
                WalletName  = "myWallet1"
            };

            var context           = CreateContext(walletReference, "password", destinationKeys.PubKey.ScriptPubKey, new Money(7500), FeeType.Low, 0);
            var transactionResult = walletTransactionHandler.BuildTransaction(context);

            var result = new Transaction(transactionResult.ToHex());
            var expectedChangeAddressKeys = WalletTestsHelpers.GenerateAddressKeys(wallet, accountKeys.ExtPubKey, "1/0");

            Assert.Single(result.Inputs);
            Assert.Equal(addressTransaction.Id, result.Inputs[0].PrevOut.Hash);

            Assert.Equal(2, result.Outputs.Count);
            var output = result.Outputs[0];

            Assert.Equal((addressTransaction.Amount - context.TransactionFee - 7500), output.Value);
            Assert.Equal(expectedChangeAddressKeys.Address.ScriptPubKey, output.ScriptPubKey);

            output = result.Outputs[1];
            Assert.Equal(7500, output.Value);
            Assert.Equal(destinationKeys.PubKey.ScriptPubKey, output.ScriptPubKey);

            Assert.Equal(addressTransaction.Amount - context.TransactionFee, result.TotalOut);
            Assert.NotNull(transactionResult.GetHash());
            Assert.Equal(result.GetHash(), transactionResult.GetHash());
        }