Core/Items: Add durability sell penalty when selling damaged items to vendors

(cherry picked from commit 32cd598d03413033413d5a4ee10a17679b4432d8)

src/server/game/Entities/Item/Item.cpp

@@ -1380,7 +1380,7 @@ void Item::SetCount(uint32 value)
     }
 }
 
-uint64 Item::CalculateDurabilityRepairCost(float discount) const
+uint64 Item::CalculateDurabilityRepairCost(float discount, bool useRateConfig /*= true*/) const
 {
     uint32 maxDurability = m_itemData->MaxDurability;
     if (!maxDurability)
@@ -1411,7 +1411,7 @@ uint64 Item::CalculateDurabilityRepairCost(float discount) const
         dmultiplier = durabilityCost->ArmorSubClassCost[itemTemplate->GetSubClass()];
 
     uint64 cost = std::round(lostDurability * dmultiplier * durabilityQualityEntry->Data * GetRepairCostMultiplier());
-    cost = uint64(cost * discount * sWorld->getRate(RATE_REPAIRCOST));
+    cost = uint64(cost * discount * (useRateConfig ? sWorld->getRate(RATE_REPAIRCOST) : 1));
 
     if (cost == 0) // Fix for ITEM_QUALITY_ARTIFACT
         cost = 1;
@@ -1419,6 +1419,11 @@ uint64 Item::CalculateDurabilityRepairCost(float discount) const
     return cost;
 }
 
+uint64 Item::CalculateDurabilitySellPenalty() const
+{
+    return CalculateDurabilityRepairCost(1.0f, false);
+}
+
 bool Item::HasEnchantRequiredSkill(Player const* player) const
 {
     // Check all enchants for required skill

src/server/game/Entities/Item/Item.h

@@ -271,7 +271,8 @@ class TC_GAME_API Item : public Object
         void SetInTrade(bool b = true) { mb_in_trade = b; }
         bool IsInTrade() const { return mb_in_trade; }
 
-        uint64 CalculateDurabilityRepairCost(float discount) const;
+        uint64 CalculateDurabilityRepairCost(float discount, bool useRateConfig = true) const;
+        uint64 CalculateDurabilitySellPenalty() const;
 
         bool HasEnchantRequiredSkill(Player const* player) const;
         uint32 GetEnchantRequiredLevel() const;

src/server/game/Entities/Player/Player.cpp

@@ -23922,6 +23922,15 @@ Optional<SellResult> Player::CanSellItemToVendor(Item const* item, uint32 amount
         return SELL_ERR_CANT_SELL_ITEM;
 
     uint64 money = uint64(sellPrice) * amount;
+    uint64 durabilityPenalty = item->CalculateDurabilitySellPenalty();
+
+    if (durabilityPenalty)
+    {
+        if (durabilityPenalty > money)
+            money = 1;
+        else
+            money -= durabilityPenalty;
+    }
 
     using BuybackStorageType = std::remove_cvref_t<decltype(m_activePlayerData->BuybackPrice[0])>;
     if (money > std::numeric_limits<BuybackStorageType>::max()) // ensure sell price * amount doesn't overflow buyback price
@@ -23933,6 +23942,15 @@ Optional<SellResult> Player::CanSellItemToVendor(Item const* item, uint32 amount
 Optional<SellResult> Player::SellItemToVendor(Item* item, uint32 amount)
 {
     uint64 money = uint64(item->GetSellPrice(this)) * amount;
+    uint64 durabilityPenalty = item->CalculateDurabilitySellPenalty();
+
+    if (durabilityPenalty)
+    {
+        if (durabilityPenalty > money)
+            money = 1;
+        else
+            money -= durabilityPenalty;
+    }
 
     if (!ModifyMoney(money)) // ensure player doesn't exceed gold limit
         return SELL_ERR_CANT_SELL_ITEM;