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[cavedroid.git] / core / src / ru / deadsoftware / cavedroid / game / model / item / InventoryItem.kt

diff --git a/core/src/ru/deadsoftware/cavedroid/game/model/item/InventoryItem.kt b/core/src/ru/deadsoftware/cavedroid/game/model/item/InventoryItem.kt
index 6c1598315cb5037813c8a385ddb06f5f062846ea..3cd406b731f5e2e0dc8a128926a4baef24d5a246 100644 (file)
--- a/core/src/ru/deadsoftware/cavedroid/game/model/item/InventoryItem.kt
+++ b/core/src/ru/deadsoftware/cavedroid/game/model/item/InventoryItem.kt
@@ -9,26 +9,68 @@ import ru.deadsoftware.cavedroid.misc.utils.drawSprite
 import ru.deadsoftware.cavedroid.misc.utils.drawString
 import ru.deadsoftware.cavedroid.misc.utils.px
 import java.io.Serializable
+import kotlin.contracts.ExperimentalContracts
+import kotlin.contracts.contract
 
 class InventoryItem @JvmOverloads constructor(
     val itemKey: String,
-    var amount: Int = 1,
+    _amount: Int = 1,
 ) : Serializable {
 
+    var amount = _amount
+        set(value) {
+            field = if (value < 0) {
+                0
+            } else {
+                value
+            }
+        }
+
     @Transient
-    lateinit var item: Item
-        private set
+    private var _item: Item? = null
+
+    var item: Item
+        get() {
+            requireNotNull(_item) { "_item is null" }
+            return _item.takeIf { amount > 0 } ?: throw IllegalArgumentException("Accessing item with zero amount")
+        }
+        private set (value) {
+            _item = value
+        }
 
     @JvmOverloads
-    constructor(_item: Item, amount: Int = 1) : this(_item.params.key, amount) {
-        item = _item
+    constructor(item: Item, amount: Int = 1) : this(item.params.key, amount) {
+        _item = item
     }
 
     fun init(gameItemsHolder: GameItemsHolder) {
-        if (this::item.isInitialized) {
+        if (_item != null) {
             return
         }
-        item = gameItemsHolder.getItem(itemKey)
+        _item = gameItemsHolder.getItem(itemKey)
+    }
+
+    @JvmOverloads
+    fun add(count: Int = 1) {
+        if (count > 0 && Int.MAX_VALUE - count < amount) {
+            throw IllegalArgumentException("$amount + $count exceeds Int.MAX_VALUE")
+        }
+
+        amount += count
+    }
+
+    @JvmOverloads
+    fun subtract(count: Int = 1) {
+        if (count < 0) {
+            throw IllegalArgumentException("Can't subtract negative amount")
+        }
+
+        add(-count)
+    }
+
+    @JvmOverloads
+    fun canBeAdded(count: Int = 1): Boolean {
+        return amount + count <= item.params.maxStack
     }
 
     private fun drawAmountText(spriteBatch: SpriteBatch, text: String,  x: Float, y: Float) {
@@ -58,7 +100,9 @@ class InventoryItem @JvmOverloads constructor(
         }
 
         val sprite = item.sprite
-        spriteBatch.drawSprite(sprite, x, y)
+        val placeableMarginTop = (item as? Item.Placeable)?.block?.params?.spriteMargins?.top ?: 0
+        val placeableMarginLeft = (item as? Item.Placeable)?.block?.params?.spriteMargins?.left ?: 0
+        spriteBatch.drawSprite(sprite, x + placeableMarginLeft, y + placeableMarginTop)
 
         if (amount < 2) {
             return
@@ -87,4 +131,12 @@ class InventoryItem @JvmOverloads constructor(
         }
     }
 
+    companion object {
+
+        @OptIn(ExperimentalContracts::class)
+        fun InventoryItem?.isNoneOrNull(): Boolean {
+            contract { returns(false) implies(this@isNoneOrNull != null) }
+            return this?.item == null || this.item.isNone()
+        }
+    }
 }