From afafe25291d5d7d608f8bc8ece95bdb4f5bf298f Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Sun, 1 Nov 2026 17:49:15 +0000
Subject: [PATCH] Decompile fn_13477
 (UIMerchantItemPurchaseMSGWnd::SetPurchase)

Batch #9656 by doczeira: 0 byte-identical, 1 confirmed by peer review.

- fn_13477 UIMerchantItemPurchaseMSGWnd::SetPurchase: logic confirmed by peer review

Peer-reviewed-by: ragnarok-clanker, tayoba, dori
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
---
 Source/UI/Edit/UIEditCtrl.cpp                 | 21 ++++++++++++++++++-
 Source/UI/Shop/UIMerchantItemPurchaseMSGWnd.h |  5 ++---
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/Source/UI/Edit/UIEditCtrl.cpp b/Source/UI/Edit/UIEditCtrl.cpp
index 7b653f9b..f99fbb37 100644
--- a/Source/UI/Edit/UIEditCtrl.cpp
+++ b/Source/UI/Edit/UIEditCtrl.cpp
@@ -7159,7 +7159,7 @@ int UIMerchantItemPurchaseMSGWnd::SendMsg(UIWindow* sender, int message, std::in
 
   switch (a) {
   case 184:
-    static_cast<CMode*>(g_charViewMode)->SendMsg(83, reinterpret_cast<std::intptr_t>(this->m_controls), this->unknown_00D0, 0, 0);
+    static_cast<CMode*>(g_charViewMode)->SendMsg(83, this->purchaseIndex, this->unknown_00D0, 0, 0);
   case 185:
     g_windowMgr.CloseWindow(230);
     reinterpret_cast<ClientItemLists*>(&g_session)->ClearItems1760And1748();
@@ -7307,6 +7307,25 @@ bool UIItemStoreSubWnd::sub_996C90() {
 }
 
 // OFFSET: 0x00996E30
+// FUNCTION: fn_13477
+void UIMerchantItemPurchaseMSGWnd::SetPurchase(int value, int amount) {
+  this->purchaseIndex = value;
+  this->unknown_00D0 = amount;
+
+  int total = 0;
+  const int count = reinterpret_cast<const SessionMessengerContext*>(&g_session)->GetList10Size();
+  for (int i = 0; i < count; ++i) {
+    ITEM_INFO item;
+    item = g_session.GetItem1760At(i);
+    if (item.unknown_0000[1] > 0) {
+      total += item.quantity * item.unknown_0014[0];
+    }
+  }
+
+  const std::string text = IntToSignedString(total, true, false) + std::string(LookupMessage(2328));
+  this->secondLine->SetText(text.c_str(), 0);
+  this->Invalidate();
+}
 
 // OFFSET: 0x00857420
 // FUNCTION: fn_10762
diff --git a/Source/UI/Shop/UIMerchantItemPurchaseMSGWnd.h b/Source/UI/Shop/UIMerchantItemPurchaseMSGWnd.h
index e00a9a84..4a302d3c 100644
--- a/Source/UI/Shop/UIMerchantItemPurchaseMSGWnd.h
+++ b/Source/UI/Shop/UIMerchantItemPurchaseMSGWnd.h
@@ -21,12 +21,11 @@ public:
   /* 00C0 */ UIStaticText* secondLine;
   /* 00C4 */ UIBitmapButton* buyButton;
   /* 00C8 */ UIBitmapButton* cancelButton;
+  /* 00CC */ int purchaseIndex;
+  /* 00D0 */ int unknown_00D0;
 
 protected:
   UIButtonContext* m_controls;
-
-public:
-  /* 00D0 */ int unknown_00D0;
 };
 
 #endif