Add I/O slots to fluid hoppers

src/main/kotlin/net/shadowfacts/extrahoppers/block/fluid/ContainerFluidHopper.kt

@@ -0,0 +1,35 @@
+package net.shadowfacts.extrahoppers.block.fluid
+
+import net.minecraft.entity.player.InventoryPlayer
+import net.minecraft.inventory.Slot
+import net.minecraft.util.math.BlockPos
+import net.minecraftforge.items.SlotItemHandler
+import net.shadowfacts.shadowmc.inventory.ContainerBase
+
+/**
+ * @author shadowfacts
+ */
+class ContainerFluidHopper(val hopper: TileEntityFluidHopper, playerInv: InventoryPlayer, pos: BlockPos): ContainerBase(pos) {
+
+	init {
+		addSlotToContainer(SlotHopperIO(hopper, 0, 26, 35))
+		addSlotToContainer(SlotHopperIO(hopper, 1, 134, 35))
+
+		for (i in 0..2) {
+			for (j in 0..8) {
+				addSlotToContainer(Slot(playerInv, j + i * 9 + 9, 8 + j * 18, 84 + i * 18))
+			}
+		}
+
+		for (k in 0..8) {
+			this.addSlotToContainer(Slot(playerInv, k, 8 + k * 18, 142))
+		}
+	}
+
+	private class SlotHopperIO(val hopper: TileEntityFluidHopper, index: Int, x: Int, y: Int): SlotItemHandler(hopper.ioInventory, index, x, y) {
+		override fun onSlotChanged() {
+			hopper.markDirty()
+		}
+	}
+
+}

src/main/kotlin/net/shadowfacts/extrahoppers/block/fluid/GUIFluidHopper.kt

@@ -13,7 +13,7 @@ import net.shadowfacts.shadowmc.ui.dsl.container
  */
 object GUIFluidHopper {
 
-	private val BG = ResourceLocation("shadowmc", "textures/gui/blank.png")
+	private val BG = ResourceLocation(MOD_ID, "textures/gui/fluid_hopper.png")
 
 	fun create(hopper: TileEntityFluidHopper, container: Container): GuiContainer {
 		return container(container) {

src/main/kotlin/net/shadowfacts/extrahoppers/block/fluid/TileEntityFluidHopper.kt

@@ -1,6 +1,7 @@
 package net.shadowfacts.extrahoppers.block.fluid
 
 import net.minecraft.block.BlockLiquid
+import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
 import net.minecraft.util.EnumFacing
 import net.minecraft.util.ITickable
@@ -8,13 +9,21 @@ import net.minecraftforge.common.capabilities.Capability
 import net.minecraftforge.fluids.Fluid.BUCKET_VOLUME
 import net.minecraftforge.fluids.FluidStack
 import net.minecraftforge.fluids.FluidTank
+import net.minecraftforge.fluids.FluidUtil
 import net.minecraftforge.fluids.capability.CapabilityFluidHandler.FLUID_HANDLER_CAPABILITY
+import net.minecraftforge.fluids.capability.CapabilityFluidHandler.FLUID_HANDLER_ITEM_CAPABILITY
+import net.minecraftforge.fluids.capability.IFluidHandlerItem
 import net.minecraftforge.fml.common.network.NetworkRegistry
+import net.minecraftforge.items.ItemStackHandler
 import net.shadowfacts.extrahoppers.EHConfig
 import net.shadowfacts.extrahoppers.block.base.TileEntityHopperBase
 import net.shadowfacts.extrahoppers.util.FluidUtils
 import net.shadowfacts.extrahoppers.util.filter.Filter
 import net.shadowfacts.extrahoppers.util.filter.FluidFilter
+import net.shadowfacts.extrahoppers.util.getFluidHandler
+import net.shadowfacts.extrahoppers.util.hasFluidHandler
+import net.shadowfacts.forgelin.extensions.get
+import net.shadowfacts.forgelin.extensions.set
 import net.shadowfacts.shadowmc.ShadowMC
 import net.shadowfacts.shadowmc.network.PacketRequestTEUpdate
 import net.shadowfacts.shadowmc.network.PacketUpdateTE
@@ -43,6 +52,21 @@ open class TileEntityFluidHopper(inverted: Boolean, advanced: Boolean): TileEnti
 			return fluid == null || fluidValiator(fluid)
 		}
 	}
+	val ioInventory = object: ItemStackHandler(2) {
+		override fun insertItem(slot: Int, stack: ItemStack, simulate: Boolean): ItemStack {
+			if (!stack.hasFluidHandler()) return stack
+//			val stackHandler = stack.getFluidHandler()
+//			when (slot) {
+//				0 -> { // insert fluid
+//					if (stackHandler.drain(tank.fill(stackHandler.drain(tank.capacity - tank.fluidAmount, false), false), false) == null) return stack
+//				}
+//				1 -> { // extract fluid
+//					if (tank.drain(stackHandler.fill(tank.drain(tank.fluidAmount, false), false), false) == null) return stack
+//				}
+//			}
+			return super.insertItem(slot, stack, simulate)
+		}
+	}
 
 	protected open val fluidValiator: (FluidStack) -> Boolean = { true }
 
@@ -67,6 +91,9 @@ open class TileEntityFluidHopper(inverted: Boolean, advanced: Boolean): TileEnti
 
 			if (!checkRedstone()) return
 
+			extractFromItem()
+			insertIntoItem()
+
 			if (handlerCooldown <= 0) {
 				handleFluidHandlers()
 			}
@@ -76,6 +103,28 @@ open class TileEntityFluidHopper(inverted: Boolean, advanced: Boolean): TileEnti
 		}
 	}
 
+	private fun extractFromItem() {
+		val stack = ioInventory[0]
+		if (!stack.isEmpty) {
+			val res = FluidUtil.tryEmptyContainer(stack, tank, tank.capacity - tank.fluidAmount, null, true)
+			if (res.isSuccess) {
+				ioInventory[0] = res.result
+				save()
+			}
+		}
+	}
+
+	private fun insertIntoItem() {
+		val stack = ioInventory[1]
+		if (!stack.isEmpty) {
+			val res = FluidUtil.tryFillContainer(stack, tank, tank.fluidAmount, null, true)
+			if (res.isSuccess) {
+				ioInventory[1] = res.result
+				save()
+			}
+		}
+	}
+
 	private fun handleFluidHandlers() {
 		val transferOut = transferOut()
 		val transferIn = transferIn()
@@ -156,14 +205,16 @@ open class TileEntityFluidHopper(inverted: Boolean, advanced: Boolean): TileEnti
 	}
 
 	override fun writeToNBT(tag: NBTTagCompound): NBTTagCompound {
-		tank.writeToNBT(tag)
+		tag.setTag("tank", tank.writeToNBT(NBTTagCompound()))
+		tag.setTag("ioInventory", ioInventory.serializeNBT())
 		tag.setInteger("handlerCooldown", handlerCooldown)
 		tag.setInteger("worldCooldown", worldCooldown)
 		return super.writeToNBT(tag)
 	}
 
 	override fun readFromNBT(tag: NBTTagCompound) {
-		tank.readFromNBT(tag)
+		tank.readFromNBT(tag.getCompoundTag("tank"))
+		ioInventory.deserializeNBT(tag.getCompoundTag("ioInventory"))
 		handlerCooldown = tag.getInteger("handlerCooldown")
 		worldCooldown = tag.getInteger("worldCooldown")
 		super.readFromNBT(tag)

src/main/kotlin/net/shadowfacts/extrahoppers/block/inventory/ContainerInventoryHopper.kt

@@ -52,7 +52,7 @@ class ContainerInventoryHopper(val hopper: TileEntityInventoryHopper, playerInv:
 	}
 
 	override fun transferStackInSlot(player: EntityPlayer, index: Int): ItemStack {
-		if (index in hopper.inventory.slots..hopper.inventory.slots + 5) {
+		if (index in hopper.inventory.slots..hopper.inventory.slots + 5) { // if the slot is a filter slot
 			return ItemStack.EMPTY
 		}
 		return super.transferStackInSlot(player, index)

src/main/kotlin/net/shadowfacts/extrahoppers/block/wooden_fluid/GUIWoodenFluidHopper.kt

@@ -14,7 +14,7 @@ import net.shadowfacts.shadowmc.ui.dsl.container
  */
 object GUIWoodenFluidHopper {
 
-	private val BG = ResourceLocation("shadowmc", "textures/gui/blank.png")
+	private val BG = ResourceLocation(MOD_ID, "textures/gui/fluid_hopper.png")
 
 	fun create(hopper: TileEntityFluidHopper, container: Container): GuiContainer {
 		return container(container) {

src/main/kotlin/net/shadowfacts/extrahoppers/gui/GUIHandler.kt

@@ -5,6 +5,7 @@ import net.minecraft.inventory.Container
 import net.minecraft.util.math.BlockPos
 import net.minecraft.world.World
 import net.minecraftforge.fml.common.network.IGuiHandler
+import net.shadowfacts.extrahoppers.block.fluid.ContainerFluidHopper
 import net.shadowfacts.extrahoppers.block.inventory.ContainerInventoryHopper
 import net.shadowfacts.extrahoppers.block.fluid.GUIFluidHopper
 import net.shadowfacts.extrahoppers.block.fluid.TileEntityFluidHopper
@@ -32,21 +33,23 @@ object GUIHandler: IGuiHandler {
 
 	override fun getClientGuiElement(ID: Int, player: EntityPlayer, world: World, x: Int, y: Int, z: Int): Any? {
 		val pos = BlockPos(x, y, z)
+		val tile = world.getTileEntity(pos)
 		return when (ID) {
-			INVERTED_HOPPER, ADVANCED_HOPPER -> GUIInventoryHopper(getServerGuiElement(ID, player, world, x, y, z)!!, world.getTileEntity(pos) as TileEntityInventoryHopper)
-			FLUID_HOPPER -> GUIFluidHopper.create(world.getTileEntity(pos) as TileEntityFluidHopper, getServerGuiElement(ID, player, world, x, y, z)!!)
+			INVERTED_HOPPER, ADVANCED_HOPPER -> GUIInventoryHopper(getServerGuiElement(ID, player, world, x, y, z)!!, tile as TileEntityInventoryHopper)
+			FLUID_HOPPER -> GUIFluidHopper.create(tile as TileEntityFluidHopper, getServerGuiElement(ID, player, world, x, y, z)!!)
+			WOODEN_FLUID_HOPPER -> GUIWoodenFluidHopper.create(tile as TileEntityFluidHopper, getServerGuiElement(ID, player, world, x, y, z)!!)
 			WOODEN_HOPPER -> GUIWoodenHopper(getServerGuiElement(ID, player, world, x, y, z)!!)
-			WOODEN_FLUID_HOPPER -> GUIWoodenFluidHopper.create(world.getTileEntity(pos) as TileEntityFluidHopper, getServerGuiElement(ID, player, world, x, y, z)!!)
 			else -> null
 		}
 	}
 
 	override fun getServerGuiElement(ID: Int, player: EntityPlayer, world: World, x: Int, y: Int, z: Int): Container? {
 		val pos = BlockPos(x, y, z)
+		val tile = world.getTileEntity(pos)
 		return when (ID) {
-			INVERTED_HOPPER, ADVANCED_HOPPER -> ContainerInventoryHopper(world.getTileEntity(pos) as TileEntityInventoryHopper, player.inventory, pos)
-			FLUID_HOPPER, WOODEN_FLUID_HOPPER -> ContainerPlayerInv(pos, player.inventory)
-			WOODEN_HOPPER -> ContainerWoodenHopper(world.getTileEntity(pos) as TileEntityWoodenHopper, player.inventory, pos)
+			INVERTED_HOPPER, ADVANCED_HOPPER -> ContainerInventoryHopper(tile as TileEntityInventoryHopper, player.inventory, pos)
+			FLUID_HOPPER, WOODEN_FLUID_HOPPER -> ContainerFluidHopper(tile as TileEntityFluidHopper, player.inventory, pos)
+			WOODEN_HOPPER -> ContainerWoodenHopper(tile as TileEntityWoodenHopper, player.inventory, pos)
 			else -> null
 		}
 	}

src/main/kotlin/net/shadowfacts/extrahoppers/util/StackUtils.kt

@@ -0,0 +1,17 @@
+package net.shadowfacts.extrahoppers.util
+
+import net.minecraft.item.ItemStack
+import net.minecraftforge.fluids.capability.CapabilityFluidHandler.FLUID_HANDLER_CAPABILITY
+import net.minecraftforge.fluids.capability.CapabilityFluidHandler.FLUID_HANDLER_ITEM_CAPABILITY
+import net.minecraftforge.fluids.capability.IFluidHandler
+
+/**
+ * @author shadowfacts
+ */
+fun ItemStack.hasFluidHandler(): Boolean {
+	return hasCapability(FLUID_HANDLER_CAPABILITY, null) || hasCapability(FLUID_HANDLER_ITEM_CAPABILITY, null)
+}
+
+fun ItemStack.getFluidHandler(): IFluidHandler {
+	return getCapability(FLUID_HANDLER_CAPABILITY, null) ?: getCapability(FLUID_HANDLER_ITEM_CAPABILITY, null) ?: throw RuntimeException("Expected fluid handler or fluid handler item capability on $this")
+}