render text when hover over market

features/retailer.lua

@@ -586,6 +586,12 @@ function Retailer.add_market(group_name, market_entity)
     set_market_group_name(market_entity.position, group_name)
 end
 
+---Returns the group name of the market, nil if not registered.
+---@param market_entity LuaEntity
+function Retailer.get_market_group_name(market_entity)
+    return get_market_group_name(market_entity.position)
+end
+
 ---Sets an item for all the group_name markets.
 ---@param group_name string
 ---@param prototype table with item name and price

map_gen/maps/crash_site/outpost_builder.lua

@@ -17,6 +17,7 @@ local concat = table.concat
 local floor = math.floor
 local format = string.format
 local tostring = tostring
+local draw_text = rendering.draw_text
 
 local b = require 'map_gen.shared.builders'
 
@@ -1750,6 +1751,51 @@ local function coin_mined(event)
     end
 end
 
+local function market_selected(event)
+    local player = game.get_player(event.player_index)
+    if not player or not player.valid then
+        return
+    end
+
+    local selected = player.selected
+
+    if not selected or not selected.valid or selected.name ~= 'market' then
+        return
+    end
+
+    local group = Retailer.get_market_group_name(selected)
+    local prototype = Retailer.get_items(group)['upgrade']
+
+    if prototype.disabled then
+        return
+    end
+
+    local args = {
+        text = nil,
+        target = selected,
+        target_offset = nil,
+        alignment = 'center',
+        surface = selected.surface,
+        color = {1, 1, 1},
+        players = {player},
+        scale = 1.5,
+        scale_with_zoom = true,
+        time_to_live = 180
+    }
+
+    args.text = prototype.name_label
+    args.target_offset = {0, -5}
+    draw_text(args)
+
+    args.text = 'Price: ' .. prototype.price
+    args.target_offset = {0, -4}
+    draw_text(args)
+
+    args.text = prototype.description
+    args.target_offset = {0, -3}
+    draw_text(args)
+end
+
 Event.add(defines.events.on_tick, tick)
 Event.add(defines.events.on_entity_died, turret_died)
 
@@ -1763,4 +1809,6 @@ Event.add(defines.events.on_player_mined_item, coin_mined)
 
 Event.add(Retailer.events.on_market_purchase, do_outpost_upgrade)
 
+Event.add(defines.events.on_selected_entity_changed, market_selected)
+
 return Public