auction: GetAuctionSellItemInfo answers maxStack and link, as the patched 1.12 Lua reads

crates/benilla-ui/src/script/auction.rs

@@ -250,7 +250,19 @@ fn row_at(model: &Model, kind: &str, index: usize) -> Option<AuctionItemRow> {
 
 /// The sell slot's `(name, texture, count, quality, canUse, stackValue)`, `stackValue` being the
 /// vendor price times the stack: the base of the suggested opening price and the deposit.
-fn sell_item_info(model: &Model) -> Option<(String, Option<String>, u32, i64, bool, u32)> {
+#[allow(clippy::type_complexity)]
+fn sell_item_info(
+    model: &Model,
+) -> Option<(
+    String,
+    Option<String>,
+    u32,
+    i64,
+    bool,
+    u32,
+    u32,
+    Option<String>,
+)> {
     let it = model.auction_sell_item.as_ref()?;
     // The real stack size, not the split-carry field: the deposit is per stack.
     let count = cursor::held_count(model, it);
@@ -259,6 +271,9 @@ fn sell_item_info(model: &Model) -> Option<(String, Option<String>, u32, i64, bo
     let quality = it.quality.map_or(-1, i64::from);
     let sell_price = template.map_or(0, |v| v.sell_price);
     let can_use = super::item_stats::item_usable_by_id(model, it.item_id);
+    // The item's stack size, the seventh value the patched 1.12 Lua reads for its deposit
+    // (`Blizzard_AuctionUI.lua:1123`); 1 when the template is unknown, so the arithmetic is safe.
+    let max_stack = template.map_or(1, |v| v.stackable.max(1));
     Some((
         name,
         it.texture.clone(),
@@ -266,6 +281,8 @@ fn sell_item_info(model: &Model) -> Option<(String, Option<String>, u32, i64, bo
         quality,
         can_use,
         sell_price.saturating_mul(count),
+        max_stack,
+        it.link.clone(),
     ))
 }
 
@@ -682,13 +699,16 @@ pub(super) fn install(lua: &Lua) -> mlua::Result<()> {
         lua.create_function(|lua, minutes: u32| {
             let model = lua.app_data_ref::<Model>().expect("model app_data");
             let rate = model.auction.as_ref().map_or(0, |a| a.deposit_percent);
-            let stack_value = sell_item_info(&model).map_or(0, |(_, _, _, _, _, v)| v);
+            let stack_value = sell_item_info(&model).map_or(0, |(_, _, _, _, _, v, _, _)| v);
             Ok(i64::from(deposit_for(rate, stack_value, minutes)))
         })?,
     )?;
 
-    // GetAuctionSellItemInfo() → name, texture, count, quality, canUse, price: six values always.
-    // An empty slot answers count 1 and quality -1: the stock Lua reads `count > 1` unguarded.
+    // GetAuctionSellItemInfo() → name, texture, count, quality, canUse, price, maxStack, link: the
+    // eight the patched 1.12 Lua reads (`Blizzard_AuctionUI.lua:1123` reads `maxStack` for the
+    // deposit; the era's own six plus the stacked-item pair). An empty slot answers count 1,
+    // quality -1 and maxStack 1: the stock Lua reads `count > 1` and does `maxStack - stackSize`
+    // unguarded, so both must be numbers.
     g.set(
         "GetAuctionSellItemInfo",
         lua.create_function(|lua, ()| {
@@ -696,7 +716,8 @@ pub(super) fn install(lua: &Lua) -> mlua::Result<()> {
                 let model = lua.app_data_ref::<Model>().expect("model app_data");
                 sell_item_info(&model)
             };
-            let Some((name, texture, count, quality, can_use, price)) = info else {
+            let Some((name, texture, count, quality, can_use, price, max_stack, link)) = info
+            else {
                 return Ok(MultiValue::from_vec(vec![
                     Value::Nil,
                     Value::Nil,
@@ -704,6 +725,8 @@ pub(super) fn install(lua: &Lua) -> mlua::Result<()> {
                     Value::Integer(-1),
                     Value::Nil,
                     Value::Integer(0),
+                    Value::Integer(1),
+                    Value::Nil,
                 ]));
             };
             Ok(MultiValue::from_vec(vec![
@@ -720,6 +743,11 @@ pub(super) fn install(lua: &Lua) -> mlua::Result<()> {
                 Value::Integer(quality),
                 flag(can_use),
                 Value::Integer(i64::from(price)),
+                Value::Integer(i64::from(max_stack)),
+                match &link {
+                    Some(l) => Value::String(lua.create_string(l)?),
+                    None => Value::Nil,
+                },
             ]))
         })?,
     )?;