IOS-8253 Show alert with available amout to send for Kaspa

BlockchainSdk/Blockchains/Kaspa/KaspaTransactionBuilder.swift

@@ -22,31 +22,16 @@ class KaspaTransactionBuilder {
  }
 
  func availableAmount() -> Amount {
- let inputs = unspentOutputs
+ let inputs = Array(unspentOutputs.prefix(maxInputCount))
  let availableAmountInSatoshi = inputs.reduce(0) { $0 + $1.amount }
  return Amount(with: blockchain, value: Decimal(availableAmountInSatoshi) / blockchain.decimalValue)
  }
 
- func unspentOutputsCount(for amount: Amount) -> Int {
- return unspentOutputs.count
- }
-
- func setUnspentOutputs(_ unspentOutputs: [BitcoinUnspentOutput]) {
- let sortedOutputs = unspentOutputs.sorted {
- $0.amount > $1.amount
- }
-
- self.unspentOutputs = Array(sortedOutputs.prefix(maxInputCount))
+ func setUnspentOutputs(_ unspentOutputs: [BitcoinUnspentOutput]) { 
+ self.unspentOutputs = unspentOutputs.sorted { $0.amount > $1.amount }
  }
 
  func buildForSign(_ transaction: Transaction) throws -> (KaspaTransaction, [Data]) {
- let availableInputValue = self.availableAmount()
-
- guard transaction.amount.type == availableInputValue.type,
- transaction.amount <= availableInputValue else {
- throw WalletError.failedToBuildTx
- }
-
  let destinationAddressScript = try scriptPublicKey(address: transaction.destinationAddress).hexString.lowercased()
 
  var outputs: [KaspaOutput] = [

BlockchainSdk/Blockchains/Kaspa/KaspaWalletManager.swift

@@ -148,7 +148,13 @@ extension KaspaWalletManager: WithdrawalNotificationProvider {
 
 extension KaspaWalletManager: MaximumAmountRestrictable {
  func validateMaximumAmount(amount: Amount, fee: Amount) throws {
- let amountAvailableToSend = txBuilder.availableAmount() - fee
+ var amountAvailableToSend = txBuilder.availableAmount() - fee
+
+ let change = amount - amountAvailableToSend
+ if change > .zeroCoin(for: wallet.blockchain), change < dustValue {
+ amountAvailableToSend = amountAvailableToSend - (dustValue - change)
+ }
+
  if amount <= amountAvailableToSend {
  return
  }