add max balance and adjust store list

api.lua

@@ -61,7 +61,11 @@ function x_marketplace.set_player_balance(name, amount)
 	local new_balance = balance + amount
 
 	if new_balance < 0 then
-		return false
+		return false, "below"
+	end
+
+	if new_balance > x_marketplace.max_balance then
+		return false, "above"
 	end
 
 	player:set_attribute("balance", new_balance)

chatcommands.lua

@@ -104,7 +104,11 @@ minetest.register_chatcommand("mp", {
 				player:set_wielded_item(ItemStack(""))
 
 				local sell_price = store_item.sell * item_count
-				local new_balance = x_marketplace.set_player_balance(caller, sell_price)
+				local new_balance, msg = x_marketplace.set_player_balance(caller, sell_price)
+
+				if msg == "above" then
+					return false, minetest.colorize(colors.yellow, "MARKET PLACE: You will go above the maximum balance if you sell this item. Transaction cancelled.")
+				end
 
 				return true, minetest.colorize(colors.green, "MARKET PLACE: You sold "..item_count.." item(s) of "..item_name.." for "..sell_price.." BitGold. Your new balance is: "..new_balance.." BitGold")
 			else
@@ -215,23 +219,33 @@ minetest.register_chatcommand("mp", {
 			if store_item then
 				local inv = player:get_inventory("main")
 				local itemstack = ItemStack(params[2])
+				local balance = x_marketplace.get_player_balance(caller)
+				local new_balance = 0
 				local amount = 0
 
 				for k, v in ipairs(inv:get_list("main")) do
 					if v:get_name() == params[2] then
-						local amount_removed = v:get_count()
-						inv:remove_item("main", v)
+						local amount_to_remove = v:get_count()
 
-						if amount_removed > itemstack:get_stack_max() then
-							amount_removed = itemstack:get_stack_max()
+						if amount_to_remove > itemstack:get_stack_max() then
+							amount_to_remove = itemstack:get_stack_max()
 						end
 
-						amount = amount + amount_removed
+						amount = amount + amount_to_remove
+
+						if balance + amount * store_item.sell > x_marketplace.max_balance then
+							amount = amount - amount_to_remove
+							minetest.chat_send_player(caller, minetest.colorize(colors.yellow, "MARKET PLACE: We couldn't buy all your items without going above your maximum balance."))
+							break
+						else
+							new_balance = balance + amount * store_item.sell
+							inv:remove_item("main", v)
+						end
 					end
 				end
 
 				local sell_price = amount * store_item.sell
-				local new_balance = x_marketplace.set_player_balance(caller, sell_price)
+				new_balance, msg = x_marketplace.set_player_balance(caller, sell_price)
 
 				return true, minetest.colorize(colors.green, "MARKET PLACE: You sold "..amount.." item(s) of "..params[2].." for "..sell_price.." BitGold. Your new balance is: "..new_balance.." BitGold")
 			else

init.lua

@@ -2,6 +2,7 @@
 -- @module x_marketplace
 -- @author SaKeL
 x_marketplace = {}
+x_marketplace.max_balance = 1000000 -- one million
 
 local path = minetest.get_modpath("x_marketplace")
 

store_list.lua

@@ -144,10 +144,10 @@ x_marketplace.store_list = {
 	-- 	buy = 0.00,
 	-- 	sell = 0.00
 	-- },
-	["default:diamondblock"] = {
-		buy = 16200.00,
-		sell = 1.00
-	},
+	-- ["default:diamondblock"] = {
+	-- 	buy = 16200.00,
+	-- 	sell = 1.00
+	-- },
 	["default:dirt"] = {
 		buy = 1.00,
 		sell = 0.25
@@ -264,10 +264,10 @@ x_marketplace.store_list = {
 		buy = 4.00,
 		sell = 1.00
 	},
-	["default:mese"] = {
-		buy = 16200.00,
-		sell = 1.00
-	},
+	-- ["default:mese"] = {
+	-- 	buy = 16200.00,
+	-- 	sell = 1.00
+	-- },
 	["default:mese_post_light"] = {
 		buy = 128.00,
 		sell = 0.25
@@ -380,10 +380,10 @@ x_marketplace.store_list = {
 		buy = 0.80,
 		sell = 0.20
 	},
-	["default:steelblock"] = {
-		buy = 2430.00,
-		sell = 1
-	},
+	-- ["default:steelblock"] = {
+	-- 	buy = 2430.00,
+	-- 	sell = 1
+	-- },
 	["default:stone"] = {
 		buy = 2.00,
 		sell = 0.50