Terminal: Rudimentary stack extraction

This is slightly more efficient, and removes the need for interfaces to
observe their inventories for changes (something that's not possible in
Vanilla).

src/main/kotlin/net/shadowfacts/phycon/PhysicalConnectivity.kt

@@ -1,9 +1,17 @@
 package net.shadowfacts.phycon
 
 import net.fabricmc.api.ModInitializer
+import net.fabricmc.fabric.api.container.ContainerFactory
+import net.fabricmc.fabric.api.container.ContainerProviderRegistry
+import net.minecraft.container.Container
+import net.minecraft.entity.player.PlayerEntity
+import net.minecraft.util.Identifier
+import net.minecraft.util.PacketByteBuf
 import net.shadowfacts.phycon.init.PhyBlockEntities
 import net.shadowfacts.phycon.init.PhyBlocks
 import net.shadowfacts.phycon.init.PhyItems
+import net.shadowfacts.phycon.network.block.terminal.TerminalBlock
+import net.shadowfacts.phycon.network.block.terminal.TerminalContainer
 
 /**
  * @author shadowfacts
@@ -16,5 +24,13 @@ object PhysicalConnectivity: ModInitializer {
 		PhyBlocks.init()
 		PhyBlockEntities.init()
 		PhyItems.init()
+		ContainerProviderRegistry.INSTANCE.registerFactory(TerminalContainer.ID, ContainerFactory(::createTerminalContainer))
 	}
+
+	private fun createTerminalContainer(syncId: Int, identifier: Identifier, player: PlayerEntity, buf: PacketByteBuf): Container {
+		val pos = buf.readBlockPos()
+		val terminalEntity = PhyBlocks.TERMINAL.getBlockEntity(player.world, pos)!!
+		return TerminalContainer(syncId, player.inventory, terminalEntity)
+	}
+
 }

src/main/kotlin/net/shadowfacts/phycon/PhysicalConnectivityClient.kt

@@ -0,0 +1,22 @@
+package net.shadowfacts.phycon
+
+import net.fabricmc.api.ClientModInitializer
+import net.fabricmc.fabric.api.client.screen.ContainerScreenFactory
+import net.fabricmc.fabric.api.client.screen.ScreenProviderRegistry
+import net.minecraft.client.MinecraftClient
+import net.minecraft.util.Identifier
+import net.shadowfacts.phycon.network.block.terminal.TerminalContainer
+import net.shadowfacts.phycon.network.block.terminal.TerminalScreen
+
+/**
+ * @author shadowfacts
+ */
+object PhysicalConnectivityClient: ClientModInitializer {
+	override fun onInitializeClient() {
+		ScreenProviderRegistry.INSTANCE.registerFactory(TerminalContainer.ID, ContainerScreenFactory(::createTerminalScreen))
+	}
+
+	fun createTerminalScreen(container: TerminalContainer): TerminalScreen {
+		return TerminalScreen(container, MinecraftClient.getInstance().player.inventory)
+	}
+}

src/main/kotlin/net/shadowfacts/phycon/network/block/netinterface/InterfaceBlockEntity.kt

@@ -3,13 +3,11 @@ package net.shadowfacts.phycon.network.block.netinterface
 import alexiil.mc.lib.attributes.SearchOptions
 import alexiil.mc.lib.attributes.item.GroupedItemInv
 import alexiil.mc.lib.attributes.item.ItemAttributes
-import net.minecraft.item.ItemStack
 import net.minecraft.util.math.Direction
 import net.shadowfacts.phycon.api.packet.Packet
 import net.shadowfacts.phycon.init.PhyBlockEntities
 import net.shadowfacts.phycon.network.DeviceBlockEntity
-import net.shadowfacts.phycon.network.packet.ReadAllPacket
-import net.shadowfacts.phycon.network.packet.RequestReadAllPacket
+import net.shadowfacts.phycon.network.packet.*
 
 /**
  * @author shadowfacts
@@ -28,24 +26,39 @@ class InterfaceBlockEntity: DeviceBlockEntity(PhyBlockEntities.INTERFACE) {
 		inventory = ItemAttributes.GROUPED_INV.getFirstOrNull(world, offsetPos, option)
 	}
 
-	override fun handlePacket(packet: Packet) {
-		when (packet) {
-			is RequestReadAllPacket -> handleReadAll(packet)
-		}
-	}
-
-	fun handleReadAll(packet: RequestReadAllPacket) {
-		enqueueToSingle(ReadAllPacket(readAll(), macAddress, packet.source))
-	}
-
-	fun readAll(): Map<ItemStack, Int> {
+	private fun getInventory(): GroupedItemInv? {
 		// if we don't have an inventory, try to get one
 		// this happens when readAll is called before a neighbor state changes, such as immediately after world load
 		if (inventory == null) updateInventory()
+		return inventory
+	}
 
-		return inventory?.let {
-			it.storedStacks.associateWith(it::getAmount)
-		} ?: mapOf()
+	override fun handlePacket(packet: Packet) {
+		when (packet) {
+			is RequestInventoryPacket -> handleRequestInventory(packet)
+			is LocateStackPacket -> handleLocateStack(packet)
+			is ExtractStackPacket -> handleExtractStack(packet)
+		}
+	}
+
+	private fun handleRequestInventory(packet: RequestInventoryPacket) {
+		getInventory()?.also { inv ->
+			enqueueToSingle(ReadInventoryPacket(inv, macAddress, packet.source))
+		}
+	}
+
+	private fun handleLocateStack(packet: LocateStackPacket) {
+		getInventory()?.also { inv ->
+			val amount = inv.getAmount(packet.stack)
+			enqueueToSingle(StackLocationPacket(packet.stack, amount, this, macAddress, packet.source))
+		}
+	}
+
+	private fun handleExtractStack(packet: ExtractStackPacket) {
+		getInventory()?.also { inv ->
+			val extracted = inv.extract(packet.stack, packet.amount)
+			enqueueToSingle(ItemStackPacket(extracted, macAddress, packet.source))
+		}
 	}
 
 }

src/main/kotlin/net/shadowfacts/phycon/network/block/terminal/TerminalBlock.kt

@@ -31,8 +31,8 @@ class TerminalBlock: BlockWithEntity<TerminalBlockEntity>(Settings.of(Material.M
 
 	override fun createBlockEntity(world: BlockView) = TerminalBlockEntity()
 
-	override fun activate(blockState_1: BlockState?, world_1: World?, blockPos_1: BlockPos?, playerEntity_1: PlayerEntity?, hand_1: Hand?, blockHitResult_1: BlockHitResult?): Boolean {
-		getBlockEntity(world_1!!, blockPos_1!!)!!.onActivate()
+	override fun activate(state: BlockState, world: World, pos: BlockPos, player: PlayerEntity, hand: Hand, hitResult: BlockHitResult): Boolean {
+		getBlockEntity(world, pos)!!.onActivate(player)
 		return true
 	}
 

src/main/kotlin/net/shadowfacts/phycon/network/block/terminal/TerminalBlockEntity.kt

@@ -1,57 +1,227 @@
 package net.shadowfacts.phycon.network.block.terminal
 
+import alexiil.mc.lib.attributes.item.GroupedItemInv
 import alexiil.mc.lib.attributes.item.ItemStackCollections
-import it.unimi.dsi.fastutil.objects.Object2IntMap
+import alexiil.mc.lib.attributes.item.ItemStackUtil
+import net.fabricmc.fabric.api.block.entity.BlockEntityClientSerializable
+import net.fabricmc.fabric.api.container.ContainerProviderRegistry
+import net.minecraft.entity.ItemEntity
+import net.minecraft.entity.player.PlayerEntity
+import net.minecraft.inventory.BasicInventory
+import net.minecraft.inventory.Inventory
+import net.minecraft.inventory.InventoryListener
 import net.minecraft.item.ItemStack
+import net.minecraft.nbt.CompoundTag
+import net.minecraft.nbt.ListTag
 import net.shadowfacts.phycon.api.packet.Packet
 import net.shadowfacts.phycon.api.util.MACAddress
 import net.shadowfacts.phycon.init.PhyBlockEntities
 import net.shadowfacts.phycon.network.DeviceBlockEntity
 import net.shadowfacts.phycon.network.block.netinterface.InterfaceBlockEntity
-import net.shadowfacts.phycon.network.packet.DeviceRemovedPacket
-import net.shadowfacts.phycon.network.packet.ReadAllPacket
-import net.shadowfacts.phycon.network.packet.RequestReadAllPacket
+import net.shadowfacts.phycon.network.packet.*
+import net.shadowfacts.phycon.util.fromTag
+import net.shadowfacts.phycon.util.toTag
 import java.util.*
+import kotlin.math.min
 
 /**
  * @author shadowfacts
  */
-class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL) {
+class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL), InventoryListener, BlockEntityClientSerializable {
 
-	private val inventoryCache = mutableMapOf<MACAddress, Map<ItemStack, Int>>()
+	companion object {
+		val LOCATE_REQUEST_TIMEOUT = 40 // ticks
+	}
+
+	private val inventoryCache = mutableMapOf<MACAddress, GroupedItemInv>()
+	val internalBuffer = BasicInventory(18)
+
+	private val pendingRequests = LinkedList<StackLocateRequest>()
+
+	private var observers = 0
+	val cachedNetItems = ItemStackCollections.intMap()
+	var cachedSortedNetItems = listOf<ItemStack>()
+	var counter = 0
+
+	init {
+		internalBuffer.addListener(this)
+	}
 
 	override fun handlePacket(packet: Packet) {
 		when (packet) {
-			is ReadAllPacket -> handleReadAll(packet)
+			is ReadInventoryPacket -> handleReadInventory(packet)
 			is DeviceRemovedPacket -> handleDeviceRemoved(packet)
+			is StackLocationPacket -> handleStackLocation(packet)
+			is ItemStackPacket -> handleItemStack(packet)
 		}
 	}
 
-	private fun handleReadAll(packet: ReadAllPacket) {
-		inventoryCache[packet.source] = packet.items
-
-		println("new items: ${computeNetItems()}")
+	private fun handleReadInventory(packet: ReadInventoryPacket) {
+		inventoryCache[packet.source] = packet.inventory
+		updateNetItems()
+		sync()
 	}
 
 	private fun handleDeviceRemoved(packet: DeviceRemovedPacket) {
 		inventoryCache.remove(packet.source)
+		updateNetItems()
+		sync()
 	}
 
-	fun computeNetItems(): Map<ItemStack, Int> {
-		val net = ItemStackCollections.intMap()
-		for (map in inventoryCache.values) {
-			for ((stack, amount) in map) {
-				net.mergeInt(stack, amount) { a, b -> a + b }
+	private fun handleStackLocation(packet: StackLocationPacket) {
+		val request = pendingRequests.firstOrNull {
+			ItemStackUtil.areEqualIgnoreAmounts(it.stack, packet.stack)
+		}
+		if (request != null) {
+			request.results.add(packet.amount to packet.sourceInterface)
+			if (request.totalResultAmount >= request.amount || counter - request.timestamp >= LOCATE_REQUEST_TIMEOUT || request.results.size >= inventoryCache.size) {
+				pendingRequests.remove(request)
+				stackLocateRequestCompleted(request)
 			}
 		}
-		return net
 	}
 
-	fun onActivate() {
+	private fun handleItemStack(packet: ItemStackPacket) {
+		// todo: handle merging stacks into the buffer better?
+		for (i in 0 until internalBuffer.invSize) {
+			if (internalBuffer.getInvStack(i).isEmpty) {
+				internalBuffer.setInvStack(i, packet.stack)
+				return
+			}
+		}
+		// todo: calculate entity spawn point by finding non-obstructed location
+		val entity = ItemEntity(world!!, pos.x.toDouble(), pos.y + 1.0, pos.z.toDouble(), packet.stack)
+		world!!.spawnEntity(entity)
+	}
+
+	private fun updateNetItems() {
+		cachedNetItems.clear()
+		for (inventory in inventoryCache.values) {
+			for (stack in inventory.storedStacks) {
+				val amount = inventory.getAmount(stack)
+				cachedNetItems.mergeInt(stack, amount) { a, b -> a + b }
+			}
+		}
+		// todo: is the map necessary or is just the sorted list enough?
+		cachedSortedNetItems = cachedNetItems.object2IntEntrySet().sortedByDescending { it.intValue }.map {
+			val stack = it.key.copy()
+			stack.count = it.intValue
+			stack
+		}
+	}
+
+	fun addObserver() {
+		observers++
+	}
+
+	fun removeObserver() {
+		observers--
+	}
+
+	override fun tick() {
+		super.tick()
+
+		if (observers > 0 && (++counter % 20) == 0) {
+			if (world!!.isClient) {
+				println(cachedNetItems)
+			} else {
+				updateNetItems()
+				sync()
+			}
+		}
+	}
+
+	fun onActivate(player: PlayerEntity) {
 		if (!world!!.isClient) {
+			updateNetItems()
+			sync()
+
 			inventoryCache.clear()
-			enqueueToSingle(RequestReadAllPacket(macAddress))
+			enqueueToSingle(RequestInventoryPacket(macAddress))
+			ContainerProviderRegistry.INSTANCE.openContainer(TerminalContainer.ID, player) { buf ->
+				buf.writeBlockPos(pos)
+			}
+		}
+		addObserver()
+	}
+
+	fun requestItem(stack: ItemStack, amount: Int = stack.count) {
+		pendingRequests.add(StackLocateRequest(stack, amount, counter))
+		enqueueToSingle(LocateStackPacket(stack, macAddress))
+	}
+
+	private fun stackLocateRequestCompleted(request: StackLocateRequest) {
+		// todo: also sort results by interface priority
+		val sortedResults = request.results.sortedByDescending { it.first }.toMutableList()
+		var amountRequested = 0
+		while (amountRequested < request.amount && sortedResults.isNotEmpty()) {
+			val (sourceAmount, sourceInterface) = sortedResults.removeAt(0)
+			val amountToRequest = min(sourceAmount, request.amount - amountRequested)
+			amountRequested += amountToRequest
+			enqueueToSingle(ExtractStackPacket(request.stack, amountToRequest, macAddress, sourceInterface.macAddress))
+		}
+	}
+
+	override fun onInvChange(inv: Inventory) {
+		if (inv == internalBuffer && !world!!.isClient) {
+			markDirty()
+			sync()
+		}
+	}
+
+	override fun toTag(tag: CompoundTag): CompoundTag {
+		tag.put("InternalBuffer", internalBuffer.toTag())
+		return super.toTag(tag)
+	}
+
+	override fun fromTag(tag: CompoundTag) {
+		super.fromTag(tag)
+		internalBuffer.fromTag(tag.getList("InternalBuffer", 10))
+	}
+
+	override fun toClientTag(tag: CompoundTag): CompoundTag {
+		tag.put("InternalBuffer", internalBuffer.toTag())
+		val list = ListTag()
+		tag.put("CachedNetItems", list)
+		for ((stack, amount) in cachedNetItems) {
+			val entryTag = stack.toTag(CompoundTag())
+			entryTag.putInt("NetAmount", amount)
+			list.add(entryTag)
+		}
+		return tag
+	}
+
+	override fun fromClientTag(tag: CompoundTag) {
+		tag.getList("InternalBuffer", 10)?.also { list ->
+			if (list.isNotEmpty()) {
+				internalBuffer.fromTag(list)
+			} else {
+				// todo: should this clear or just do nothing?
+				internalBuffer.clear()
+			}
+		}
+		val list = tag.getList("CachedNetItems", 10)
+		cachedNetItems.clear()
+		for (entryTag in list) {
+			val stack = ItemStack.fromTag(entryTag as CompoundTag)
+			val netAmount = entryTag.getInt("NetAmount")
+			cachedNetItems[stack] = netAmount
+		}
+		cachedSortedNetItems = cachedNetItems.object2IntEntrySet().sortedByDescending { it.intValue }.map {
+			val stack = it.key.copy()
+			stack.count = it.intValue
+			stack
 		}
 	}
 
 }
+
+data class StackLocateRequest(
+		val stack: ItemStack,
+		val amount: Int,
+		val timestamp: Int,
+		var results: MutableSet<Pair<Int, InterfaceBlockEntity>> = mutableSetOf()
+) {
+	val totalResultAmount: Int
+		get() = results.fold(0) { acc, (amount, _) -> acc + amount }
+}

src/main/kotlin/net/shadowfacts/phycon/network/block/terminal/TerminalContainer.kt

@@ -0,0 +1,73 @@
+package net.shadowfacts.phycon.network.block.terminal
+
+import net.minecraft.container.Container
+import net.minecraft.container.Slot
+import net.minecraft.container.SlotActionType
+import net.minecraft.entity.player.PlayerEntity
+import net.minecraft.entity.player.PlayerInventory
+import net.minecraft.item.ItemStack
+import net.minecraft.util.Identifier
+import net.shadowfacts.phycon.PhysicalConnectivity
+import kotlin.math.max
+
+/**
+ * @author shadowfacts
+ */
+class TerminalContainer(syncId: Int, playerInv: PlayerInventory, val terminal: TerminalBlockEntity): Container(null, syncId) {
+
+	companion object {
+		val ID = Identifier(PhysicalConnectivity.MODID, "terminal")
+	}
+
+	init {
+		// network
+		for (y in 0 until 6) {
+			for (x in 0 until 9) {
+				addSlot(TerminalFakeSlot(terminal, y * 9 + x, 66 + x * 18, 18 + y * 18))
+			}
+		}
+
+		// internal buffer
+		for (y in 0 until 6) {
+			for (x in 0 until 3) {
+				addSlot(Slot(terminal.internalBuffer, y * 3 + x, 8 + x * 18, 18 + y * 18))
+			}
+		}
+
+		// player inv
+		for (y in 0 until 3) {
+			for (x in 0 until 9) {
+				addSlot(Slot(playerInv, x + y * 9 + 9, 66 + x * 18, 140 + y * 18))
+			}
+		}
+		// hotbar
+		for (x in 0 until 9) {
+			addSlot(Slot(playerInv, x, 66 + x * 18, 198))
+		}
+	}
+
+	override fun canUse(player: PlayerEntity): Boolean {
+		return true
+	}
+
+	override fun close(player: PlayerEntity) {
+		super.close(player)
+
+		terminal.removeObserver()
+	}
+
+	override fun onSlotClick(slotId: Int, clickData: Int, actionType: SlotActionType, player: PlayerEntity): ItemStack {
+		if (actionType == SlotActionType.QUICK_MOVE) {
+			if (slotId < 54) {
+				// the slot clicked was one of the network stacks
+				val slot = slotList[slotId]
+				val stack = slotList[slotId].stack
+				if (!stack.isEmpty && !player.world.isClient) {
+					terminal.requestItem(stack, max(stack.count, stack.maxCount))
+				}
+				return ItemStack.EMPTY
+			}
+		}
+		return super.onSlotClick(slotId, clickData, actionType, player)
+	}
+}

src/main/kotlin/net/shadowfacts/phycon/network/block/terminal/TerminalFakeSlot.kt

@@ -0,0 +1,61 @@
+package net.shadowfacts.phycon.network.block.terminal
+
+import net.minecraft.container.Slot
+import net.minecraft.entity.player.PlayerEntity
+import net.minecraft.inventory.Inventory
+import net.minecraft.item.ItemStack
+
+/**
+ * @author shadowfacts
+ */
+class TerminalFakeSlot(val terminal: TerminalBlockEntity, slot: Int, x: Int, y: Int): Slot(FakeInventory(terminal, slot), slot, x, y) {
+
+	override fun canInsert(stack: ItemStack): Boolean {
+		return false
+	}
+
+	override fun setStack(stack: ItemStack) {
+	}
+
+	override fun canTakeItems(player: PlayerEntity): Boolean {
+		return false
+	}
+
+}
+
+class FakeInventory(val terminal: TerminalBlockEntity, val slot: Int): Inventory {
+	override fun getInvStack(_slot: Int): ItemStack {
+		if (slot >= terminal.cachedSortedNetItems.size) return ItemStack.EMPTY
+		return terminal.cachedSortedNetItems[slot]
+	}
+
+	override fun markDirty() {
+	}
+
+	override fun clear() {
+	}
+
+	override fun setInvStack(p0: Int, p1: ItemStack?) {
+	}
+
+	override fun removeInvStack(p0: Int): ItemStack {
+		return ItemStack.EMPTY
+	}
+
+	override fun canPlayerUseInv(p0: PlayerEntity?): Boolean {
+		return false
+	}
+
+	override fun getInvSize(): Int {
+		return 1
+	}
+
+	override fun takeInvStack(p0: Int, p1: Int): ItemStack {
+		return ItemStack.EMPTY
+	}
+
+	override fun isInvEmpty(): Boolean {
+		return false
+	}
+
+}

src/main/kotlin/net/shadowfacts/phycon/network/block/terminal/TerminalScreen.kt

@@ -0,0 +1,40 @@
+package net.shadowfacts.phycon.network.block.terminal
+
+import com.mojang.blaze3d.platform.GlStateManager
+import net.minecraft.client.gui.screen.ingame.AbstractContainerScreen
+import net.minecraft.entity.player.PlayerInventory
+import net.minecraft.text.LiteralText
+import net.minecraft.util.Identifier
+import net.shadowfacts.phycon.PhysicalConnectivity
+
+/**
+ * @author shadowfacts
+ */
+// todo: translate title
+class TerminalScreen(container: TerminalContainer, playerInv: PlayerInventory): AbstractContainerScreen<TerminalContainer>(container, playerInv, LiteralText("Terminal")) {
+	companion object {
+		val BACKGROUND = Identifier(PhysicalConnectivity.MODID, "textures/gui/terminal.png")
+	}
+
+	init {
+		containerWidth = 252
+		containerHeight = 222
+	}
+
+	override fun drawForeground(mouseX: Int, mouseY: Int) {
+		font.draw(title.asFormattedString(), 65f, 6f, 0x404040)
+		font.draw(playerInventory.displayName.asFormattedString(), 65f, containerHeight - 94f, 0x404040)
+		// todo: translate this
+		font.draw("Buffer", 7f, 6f, 0x404040)
+	}
+
+	override fun drawBackground(delta: Float, mouseX: Int, mouseY: Int) {
+		GlStateManager.color4f(1f, 1f, 1f, 1f)
+		minecraft!!.textureManager.bindTexture(BACKGROUND)
+		val x = (width - containerWidth) / 2
+		val y = (height - containerHeight) / 2
+		blit(x, y, 0, 0, containerWidth, containerHeight)
+
+	}
+
+}

src/main/kotlin/net/shadowfacts/phycon/network/packet/ExtractStackPacket.kt

@@ -0,0 +1,10 @@
+package net.shadowfacts.phycon.network.packet
+
+import net.minecraft.item.ItemStack
+import net.shadowfacts.phycon.api.util.MACAddress
+
+/**
+ * @author shadowfacts
+ */
+class ExtractStackPacket(val stack: ItemStack, val amount: Int, source: MACAddress, destination: MACAddress): BasePacket(source, destination) {
+}

src/main/kotlin/net/shadowfacts/phycon/network/packet/ItemStackPacket.kt

@@ -0,0 +1,10 @@
+package net.shadowfacts.phycon.network.packet
+
+import net.minecraft.item.ItemStack
+import net.shadowfacts.phycon.api.util.MACAddress
+
+/**
+ * @author shadowfacts
+ */
+class ItemStackPacket(val stack: ItemStack, source: MACAddress, destination: MACAddress): BasePacket(source, destination) {
+}

src/main/kotlin/net/shadowfacts/phycon/network/packet/LocateStackPacket.kt

@@ -0,0 +1,10 @@
+package net.shadowfacts.phycon.network.packet
+
+import net.minecraft.item.ItemStack
+import net.shadowfacts.phycon.api.util.MACAddress
+
+/**
+ * @author shadowfacts
+ */
+class LocateStackPacket(val stack: ItemStack, source: MACAddress, destination: MACAddress = MACAddress.BROADCAST): BasePacket(source, destination) {
+}

src/main/kotlin/net/shadowfacts/phycon/network/packet/ReadInventoryPacket.kt

@@ -1,13 +1,13 @@
 package net.shadowfacts.phycon.network.packet
 
-import net.minecraft.item.ItemStack
+import alexiil.mc.lib.attributes.item.GroupedItemInv
 import net.shadowfacts.phycon.api.util.MACAddress
 
 /**
  * @author shadowfacts
  */
-class ReadAllPacket(
-		val items: Map<ItemStack, Int>,
+class ReadInventoryPacket(
+		val inventory: GroupedItemInv,
 		source: MACAddress,
 		destination: MACAddress
 ): BasePacket(source, destination)

src/main/kotlin/net/shadowfacts/phycon/network/packet/RequestInventoryPacket.kt

@@ -0,0 +1,8 @@
+package net.shadowfacts.phycon.network.packet
+
+import net.shadowfacts.phycon.api.util.MACAddress
+
+/**
+ * @author shadowfacts
+ */
+class RequestInventoryPacket(source: MACAddress, destination: MACAddress = MACAddress.BROADCAST): BasePacket(source, destination)

src/main/kotlin/net/shadowfacts/phycon/network/packet/RequestReadAllPacket.kt

@@ -1,8 +0,0 @@
-package net.shadowfacts.phycon.network.packet
-
-import net.shadowfacts.phycon.api.util.MACAddress
-
-/**
- * @author shadowfacts
- */
-class RequestReadAllPacket(source: MACAddress, destination: MACAddress = MACAddress.BROADCAST): BasePacket(source, destination)

src/main/kotlin/net/shadowfacts/phycon/network/packet/StackLocationPacket.kt

@@ -0,0 +1,18 @@
+package net.shadowfacts.phycon.network.packet
+
+import net.minecraft.item.ItemStack
+import net.shadowfacts.phycon.api.util.MACAddress
+import net.shadowfacts.phycon.network.block.netinterface.InterfaceBlockEntity
+
+/**
+ * @author shadowfacts
+ */
+// todo: better name with LocateStackPacket
+class StackLocationPacket(
+		val stack: ItemStack,
+		val amount: Int,
+		val sourceInterface: InterfaceBlockEntity,
+		source: MACAddress,
+		destination: MACAddress
+): BasePacket(source, destination) {
+}

src/main/kotlin/net/shadowfacts/phycon/util/nbt.kt

@@ -0,0 +1,34 @@
+package net.shadowfacts.phycon.util
+
+import net.minecraft.inventory.BasicInventory
+import net.minecraft.item.ItemStack
+import net.minecraft.nbt.CompoundTag
+import net.minecraft.nbt.ListTag
+import java.lang.RuntimeException
+
+/**
+ * @author shadowfacts
+ */
+fun BasicInventory.toTag(): ListTag {
+	val list = ListTag()
+	for (slot in 0 until invSize) {
+		val stack = getInvStack(slot)
+		if (!stack.isEmpty) {
+			val stackTag = stack.toTag(CompoundTag())
+			stackTag.putInt("Slot", slot)
+			list.add(stackTag)
+		}
+	}
+	return list
+}
+
+fun BasicInventory.fromTag(list: ListTag) {
+	if (list.listType != 10) throw RuntimeException("Can't decode BasicInventory from list tag that does not contain compound tags")
+	this.clear()
+	for (tag in list) {
+		val compound = tag as CompoundTag
+		val stack = ItemStack.fromTag(compound)
+		val slot = compound.getInt("Slot")
+		setInvStack(slot, stack)
+	}
+}

src/main/resources/fabric.mod.json

@@ -19,6 +19,12 @@
         "adapter": "kotlin",
         "value": "net.shadowfacts.phycon.PhysicalConnectivity"
       }
+    ],
+    "client": [
+      {
+        "adapter": "kotlin",
+        "value": "net.shadowfacts.phycon.PhysicalConnectivityClient"
+      }
     ]
   },
   "mixins": [