feat(tui): render tx inputs explicitly

Co-Authored-By: Virgil <virgil@lethean.io>

tui/explorer_model.go

@@ -309,14 +309,7 @@ func (m *ExplorerModel) viewTxDetail() string {
 	if len(tx.Vin) > 0 {
 		b.WriteString(" Inputs:\n")
 		for i, in := range tx.Vin {
-			switch v := in.(type) {
-			case types.TxInputGenesis:
-				b.WriteString(fmt.Sprintf("  [%d] coinbase height=%d\n", i, v.Height))
-			case types.TxInputToKey:
-				b.WriteString(fmt.Sprintf("  [%d] to_key amount=%d key_image=%x\n", i, v.Amount, v.KeyImage[:4]))
-			default:
-				b.WriteString(fmt.Sprintf("  [%d] %T\n", i, v))
-			}
+			b.WriteString(fmt.Sprintf("  [%d] %s\n", i, describeTxInput(in)))
 		}
 	}
 
@@ -357,6 +350,25 @@ func describeTxOutTarget(target types.TxOutTarget) string {
 	}
 }
 
+// describeTxInput renders a human-readable summary for transaction inputs in
+// the explorer tx detail view.
+func describeTxInput(input types.TxInput) string {
+	switch v := input.(type) {
+	case types.TxInputGenesis:
+		return fmt.Sprintf("coinbase height=%d", v.Height)
+	case types.TxInputToKey:
+		return fmt.Sprintf("to_key amount=%d key_image=%x", v.Amount, v.KeyImage[:4])
+	case types.TxInputHTLC:
+		return fmt.Sprintf("htlc origin=%q amount=%d key_image=%x", v.HTLCOrigin, v.Amount, v.KeyImage[:4])
+	case types.TxInputMultisig:
+		return fmt.Sprintf("multisig amount=%d sigs=%d out=%x", v.Amount, v.SigsCount, v.MultisigOutID[:4])
+	case types.TxInputZC:
+		return fmt.Sprintf("zc inputs=%d key_image=%x", len(v.KeyOffsets), v.KeyImage[:4])
+	default:
+		return fmt.Sprintf("%T", v)
+	}
+}
+
 // loadBlocks refreshes the block list from the chain store.
 // Blocks are listed from newest (top) to oldest.
 func (m *ExplorerModel) loadBlocks() {

tui/explorer_model_test.go

@@ -10,6 +10,8 @@ import (
 	"testing"
 
 	tea "github.com/charmbracelet/bubbletea"
+
+	"dappco.re/go/core/blockchain/types"
 )
 
 func TestExplorerModel_View_Good_BlockList(t *testing.T) {
@@ -174,3 +176,52 @@ func TestExplorerModel_ViewBlockDetail_Good_CoinbaseOnly(t *testing.T) {
 		t.Errorf("block detail should contain 'coinbase only' for blocks with no TxHashes, got:\n%s", out)
 	}
 }
+
+func TestDescribeTxInput_Good(t *testing.T) {
+	tests := []struct {
+		name  string
+		input types.TxInput
+		want  string
+	}{
+		{
+			name:  "genesis",
+			input: types.TxInputGenesis{Height: 12},
+			want:  "coinbase height=12",
+		},
+		{
+			name: "to_key",
+			input: types.TxInputToKey{
+				Amount:   42,
+				KeyImage: types.KeyImage{0xaa, 0xbb, 0xcc, 0xdd},
+			},
+			want: "to_key amount=42 key_image=aabbccdd",
+		},
+		{
+			name: "htlc",
+			input: types.TxInputHTLC{
+				HTLCOrigin: "origin-hash",
+				Amount:     7,
+				KeyImage:   types.KeyImage{0x10, 0x20, 0x30, 0x40},
+			},
+			want: `htlc origin="origin-hash" amount=7 key_image=10203040`,
+		},
+		{
+			name: "multisig",
+			input: types.TxInputMultisig{
+				Amount:        99,
+				SigsCount:     3,
+				MultisigOutID: types.Hash{0x01, 0x02, 0x03, 0x04},
+			},
+			want: "multisig amount=99 sigs=3 out=01020304",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := describeTxInput(tt.input)
+			if got != tt.want {
+				t.Fatalf("describeTxInput() = %q, want %q", got, tt.want)
+			}
+		})
+	}
+}