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

   1 package ru.deadsoftware.cavedroid.game.model.item
   2
   3 import com.badlogic.gdx.graphics.Color
   4 import com.badlogic.gdx.graphics.g2d.SpriteBatch
   5 import com.badlogic.gdx.graphics.glutils.ShapeRenderer
   6 import ru.deadsoftware.cavedroid.game.GameItemsHolder
   7 import ru.deadsoftware.cavedroid.game.model.dto.SaveDataDto
   8 import ru.deadsoftware.cavedroid.misc.Assets
   9 import ru.deadsoftware.cavedroid.misc.Saveable
  10 import ru.deadsoftware.cavedroid.misc.utils.drawSprite
  11 import ru.deadsoftware.cavedroid.misc.utils.drawString
  12 import ru.deadsoftware.cavedroid.misc.utils.px
  13 import kotlin.contracts.ExperimentalContracts
  14 import kotlin.contracts.contract
  15
  16 class InventoryItem @JvmOverloads constructor(
  17     val itemKey: String,
  18     _amount: Int = 1,
  19 ) :  Saveable {
  20
  21     var amount = _amount
  22         set(value) {
  23             field = if (value < 0) {
  24                 0
  25             } else {
  26                 value
  27             }
  28         }
  29
  30     private var _item: Item? = null
  31
  32     var item: Item
  33         get() {
  34             requireNotNull(_item) { "_item is null" }
  35             return _item.takeIf { amount > 0 } ?: throw IllegalArgumentException("Accessing item with zero amount")
  36         }
  37         private set (value) {
  38             _item = value
  39         }
  40
  41     @JvmOverloads
  42     constructor(item: Item, amount: Int = 1) : this(item.params.key, amount) {
  43         _item = item
  44     }
  45
  46     fun init(gameItemsHolder: GameItemsHolder) {
  47         if (_item != null) {
  48             return
  49         }
  50         _item = gameItemsHolder.getItem(itemKey)
  51     }
  52
  53     @JvmOverloads
  54     fun add(count: Int = 1) {
  55         if (count > 0 && Int.MAX_VALUE - count < amount) {
  56             throw IllegalArgumentException("$amount + $count exceeds Int.MAX_VALUE")
  57         }
  58
  59         amount += count
  60     }
  61
  62     @JvmOverloads
  63     fun subtract(count: Int = 1) {
  64         if (count < 0) {
  65             throw IllegalArgumentException("Can't subtract negative amount")
  66         }
  67
  68         add(-count)
  69     }
  70
  71     @JvmOverloads
  72     fun canBeAdded(count: Int = 1): Boolean {
  73         return amount + count <= item.params.maxStack
  74     }
  75
  76     private fun drawAmountText(spriteBatch: SpriteBatch, text: String,  x: Float, y: Float) {
  77         spriteBatch.drawString(text, x + 1, y + 1, Color.BLACK)
  78         spriteBatch.drawString(text, x, y, Color.WHITE)
  79     }
  80
  81     fun drawSelected(spriteBatch: SpriteBatch, x: Float, y: Float) {
  82         if (item.isNone()) {
  83             return
  84         }
  85
  86         val sprite = item.sprite
  87         val amountString = amount.toString()
  88         spriteBatch.drawSprite(sprite, x - 10f, y - 10f, rotation = 0f, width = 20f, height = 20f)
  89         drawAmountText(
  90             spriteBatch = spriteBatch,
  91             text = amountString,
  92             x = x + 10f - Assets.getStringWidth(amountString) + 1f,
  93             y = y + 10f - Assets.getStringHeight(amountString) + 1f
  94         )
  95     }
  96
  97     fun draw(spriteBatch: SpriteBatch, shapeRenderer: ShapeRenderer, x: Float, y: Float) {
  98         if (item.isNone()) {
  99             return
 100         }
 101
 102         val sprite = item.sprite
 103         val placeableMarginTop = (item as? Item.Placeable)?.block?.params?.spriteMargins?.top ?: 0
 104         val placeableMarginLeft = (item as? Item.Placeable)?.block?.params?.spriteMargins?.left ?: 0
 105         spriteBatch.drawSprite(sprite, x + placeableMarginLeft, y + placeableMarginTop)
 106
 107         if (amount < 2) {
 108             return
 109         }
 110
 111         if (item.isTool()) {
 112             spriteBatch.end()
 113             shapeRenderer.begin(ShapeRenderer.ShapeType.Filled)
 114             shapeRenderer.color = Color.GREEN
 115             shapeRenderer.rect(
 116                 /* x = */ x,
 117                 /* y = */ y + 1.px - 2,
 118                 /* width = */ 1.px * (amount.toFloat() / item.params.maxStack.toFloat()),
 119                 /* height = */ 2f
 120             )
 121             shapeRenderer.end()
 122             spriteBatch.begin()
 123         } else {
 124             val amountString = amount.toString()
 125             drawAmountText(
 126                 spriteBatch = spriteBatch,
 127                 text = amountString,
 128                 x = x + 1.px - Assets.getStringWidth(amountString),
 129                 y = y + 1.px - Assets.getStringHeight(amountString)
 130             )
 131         }
 132     }
 133
 134     override fun getSaveData(): SaveDataDto.InventoryItemSaveData {
 135         return SaveDataDto.InventoryItemSaveData(
 136             version = SAVE_DATA_VERSION,
 137             itemKey = itemKey,
 138             amount = amount,
 139         )
 140     }
 141
 142     companion object {
 143         private const val SAVE_DATA_VERSION = 1
 144
 145         @OptIn(ExperimentalContracts::class)
 146         fun InventoryItem?.isNoneOrNull(): Boolean {
 147             contract { returns(false) implies(this@isNoneOrNull != null) }
 148             return this?.item == null || this.item.isNone()
 149         }
 150
 151
 152         fun fromSaveData(
 153             saveData: SaveDataDto.InventoryItemSaveData,
 154             gameItemsHolder: GameItemsHolder? = null
 155         ): InventoryItem {
 156             saveData.verifyVersion(SAVE_DATA_VERSION)
 157
 158             val inventoryItem = InventoryItem(saveData.itemKey, saveData.amount)
 159             gameItemsHolder?.let(inventoryItem::init)
 160
 161             return inventoryItem
 162         }
 163     }
 164
 165 }