core: Add TaprootWitness.sigVersion (#5954)

* core: Add TaprootWitness.sigVersion

* Remove uneeded pattern match

* Be more precise with types

core/src/main/scala/org/bitcoins/core/crypto/TxSigComponent.scala

@@ -448,12 +448,8 @@ case class TaprootTxSigComponent(
 
   override val witnessVersion: WitnessVersion1.type = WitnessVersion1
 
-  override def sigVersion: SigVersionTaproot = {
+  override def sigVersion: SigVersionTaproot = witness.sigVersion
-    witness match {
+
-      case _: TaprootKeyPath => SigVersionTaprootKeySpend
-      case _: TaprootScriptPath | _: TaprootUnknownPath => SigVersionTapscript
-    }
-  }
 }
 
 object BaseTxSigComponent {

core/src/main/scala/org/bitcoins/core/protocol/script/ScriptWitness.scala

@@ -1,6 +1,7 @@
 package org.bitcoins.core.protocol.script
 
 import org.bitcoins.core.protocol.CompactSizeUInt
+import org.bitcoins.core.protocol.script.LeafVersion.UnknownLeafVersion
 import org.bitcoins.core.script.constant.{OP_0, ScriptNumberOperation}
 import org.bitcoins.core.serializers.script.{
   RawScriptWitnessParser,
@@ -236,6 +237,8 @@ sealed trait TaprootWitness extends ScriptWitness {
       CryptoUtil.sha256(cmpct.bytes ++ annex)
     }
   }
+
+  def sigVersion: SigVersionTaproot
 }
 
 object TaprootWitness extends Factory[TaprootWitness] {
@@ -277,6 +280,9 @@ case class TaprootKeyPath(
         Vector(signature.bytes)
     }
   }
+
+  override def sigVersion: SigVersionTaprootKeySpend.type =
+    SigVersionTaprootKeySpend
 }
 
 object TaprootKeyPath extends Factory[TaprootKeyPath] {
@@ -401,6 +407,14 @@ case class TaprootScriptPath(stack: Vector[ByteVector]) extends TaprootWitness {
     * defined as in BIP340. Fail if this point is not on the curve.
     */
   def p: XOnlyPubKey = controlBlock.p
+
+  def leafVersion: LeafVersion = controlBlock.leafVersion
+
+  override def sigVersion: SigVersionTapscript.type = leafVersion match {
+    case LeafVersion.Tapscript => SigVersionTapscript
+    case UnknownLeafVersion(toByte) =>
+      sys.error(s"Unknown leaf version=$toByte, cannot determine sigVersion")
+  }
 }
 
 object TaprootScriptPath extends Factory[TaprootScriptPath] {
@@ -567,4 +581,9 @@ case class TaprootUnknownPath(stack: Vector[ByteVector])
       None
     }
   }
+
+  override def sigVersion: SigVersionTaproot = {
+    // default to tapscript for unknown leafver and sigversion?
+    SigVersionTapscript
+  }
 }