From 1275140334d3cf41292230fe380e38f4f5442b69 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Peter=20Jas=CC=8Cko?= <peter.jasko@vacuumlabs.com>
Date: Thu, 23 Nov 2023 23:38:25 +0100
Subject: [PATCH] feat(cardano): drep ui

---
 core/src/apps/cardano/layout.py | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/core/src/apps/cardano/layout.py b/core/src/apps/cardano/layout.py
index 0205c624062..6858c2cb59c 100644
--- a/core/src/apps/cardano/layout.py
+++ b/core/src/apps/cardano/layout.py
@@ -5,6 +5,7 @@
     ButtonRequestType,
     CardanoAddressType,
     CardanoCertificateType,
+    CardanoDRepType,
     CardanoNativeScriptType,
 )
 from trezor.strings import format_amount
@@ -559,6 +560,10 @@ async def confirm_certificate(
         assert certificate.deposit is not None  # validate_certificate
         props.append(("Deposit:", format_coin_amount(certificate.deposit, network_id)))
 
+    elif certificate.type == CardanoCertificateType.VOTE_DELEGATION:
+        assert certificate.drep is not None  # validate_certificate
+        props.append(_format_drep(certificate.drep))
+
     await confirm_properties(
         "confirm_certificate",
         "Confirm transaction",
@@ -734,6 +739,28 @@ def _format_stake_credential(
         raise ValueError
 
 
+def _format_drep(drep: messages.CardanoDRep) -> tuple[str, str]:
+    if drep.type == CardanoDRepType.KEY_HASH:
+        assert drep.key_hash is not None  # validate_drep
+        return (
+            "Delegating to key hash:",
+            bech32.encode(bech32.HRP_KEY_HASH, drep.key_hash),
+        )
+    elif drep.type == CardanoDRepType.SCRIPT_HASH:
+        assert drep.script_hash is not None  # validate_drep
+        return (
+            "Delegating to script:",
+            bech32.encode(bech32.HRP_SCRIPT_HASH, drep.script_hash),
+        )
+    elif drep.type == CardanoDRepType.ABSTAIN:
+        return ("Delegating to:", "Abstain")
+    elif drep.type == CardanoDRepType.NO_CONFIDENCE:
+        return ("Delegating to:", "No Confidence")
+    else:
+        # should be unreachable unless there's a bug in validation
+        raise ValueError
+
+
 async def confirm_cvote_registration_delegation(
     public_key: str,
     weight: int,