kotlin setup

src/main/java/dev/plex/shop/ShopMenu.kt

@@ -0,0 +1,34 @@
+package dev.plex.shop
+
+import dev.plex.player.PlexPlayer
+import dev.plex.shop.item.AbstractItem
+import dev.plex.util.minimessage.SafeMiniMessage
+import org.bukkit.Bukkit
+import org.bukkit.entity.Player
+import org.bukkit.inventory.Inventory
+
+/**
+ * @author Taah
+ * @project plex-shop
+ * @since 11:21 PM [10-06-2022]
+ *
+ */
+class ShopMenu {
+    companion object {
+        val ITEMS = mapOf<Int, AbstractItem>()
+    }
+
+    fun open(plexPlayer: PlexPlayer)
+    {
+        val player: Player? = plexPlayer.player
+        val inventory: Inventory = constructInventory()
+        player?.openInventory(inventory)
+    }
+
+    private fun constructInventory(): Inventory
+    {
+        val inventory: Inventory = Bukkit.createInventory(null, 54, SafeMiniMessage.mmDeserialize("<gold>Shop"))
+        ITEMS.forEach { (t, u) ->  inventory.setItem(t, u.item) }
+        return inventory
+    }
+}

src/main/java/dev/plex/shop/item/AbstractItem.kt

@@ -0,0 +1,18 @@
+package dev.plex.shop.item
+
+import dev.plex.cache.DataUtils
+import dev.plex.player.PlexPlayer
+import org.bukkit.inventory.ItemStack
+import java.util.concurrent.CompletableFuture
+
+abstract class AbstractItem(val item: ItemStack, private val cost: Double)
+{
+    fun purchase(player: PlexPlayer)
+    {
+        player.coins.minus(this.cost);
+        player.player?.inventory?.addItem(this.item);
+        CompletableFuture.runAsync {
+            DataUtils.update(player);
+        }
+    }
+}