Terminal: Add basic insertion into inventories

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

@@ -1,8 +1,10 @@
 package net.shadowfacts.phycon.network.block.netinterface
 
 import alexiil.mc.lib.attributes.SearchOptions
+import alexiil.mc.lib.attributes.Simulation
 import alexiil.mc.lib.attributes.item.GroupedItemInv
 import alexiil.mc.lib.attributes.item.ItemAttributes
+import net.minecraft.entity.ItemEntity
 import net.minecraft.util.math.Direction
 import net.shadowfacts.phycon.api.packet.Packet
 import net.shadowfacts.phycon.init.PhyBlockEntities
@@ -38,6 +40,8 @@ class InterfaceBlockEntity: DeviceBlockEntity(PhyBlockEntities.INTERFACE) {
 			is RequestInventoryPacket -> handleRequestInventory(packet)
 			is LocateStackPacket -> handleLocateStack(packet)
 			is ExtractStackPacket -> handleExtractStack(packet)
+			is CheckCapacityPacket -> handleCheckCapacity(packet)
+            is ItemStackPacket -> handleItemStack(packet)
 		}
 	}
 
@@ -61,4 +65,30 @@ class InterfaceBlockEntity: DeviceBlockEntity(PhyBlockEntities.INTERFACE) {
 		}
 	}
 
+	private fun handleCheckCapacity(packet: CheckCapacityPacket) {
+		getInventory()?.also { inv ->
+			val remaining = inv.attemptInsertion(packet.stack, Simulation.SIMULATE)
+			val couldAccept = packet.stack.count - remaining.count
+			sendToSingle(CapacityPacket(packet.stack, couldAccept, this, macAddress, packet.source))
+		}
+	}
+
+	private fun handleItemStack(packet: ItemStackPacket) {
+		val inventory = getInventory()
+		if (inventory != null) {
+			val remaining = inventory.insert(packet.stack)
+			if (!remaining.isEmpty) {
+				// todo: should this send whatever was left back to the terminal instead of dropping it?
+				// todo: calculate entity spawn point by finding non-obstructed location
+				val entity = ItemEntity(world!!, pos.x.toDouble(), pos.y + 1.0, pos.z.toDouble(), remaining)
+				world!!.spawnEntity(entity)
+			}
+		} else {
+			// todo: should the stack back to the terminal instead of dropping it?
+			// 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)
+		}
+	}
+
 }

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

@@ -3,6 +3,7 @@ package net.shadowfacts.phycon.network.block.terminal
 import alexiil.mc.lib.attributes.item.GroupedItemInv
 import alexiil.mc.lib.attributes.item.ItemStackCollections
 import alexiil.mc.lib.attributes.item.ItemStackUtil
+import it.unimi.dsi.fastutil.ints.Int2ObjectArrayMap
 import net.fabricmc.fabric.api.block.entity.BlockEntityClientSerializable
 import net.fabricmc.fabric.api.screenhandler.v1.ExtendedScreenHandlerFactory
 import net.minecraft.block.BlockState
@@ -37,12 +38,14 @@ class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL), Invento
 
 	companion object {
 		val LOCATE_REQUEST_TIMEOUT = 40 // ticks
+        val INSERTION_TIMEOUT = 40
 	}
 
 	private val inventoryCache = mutableMapOf<MACAddress, GroupedItemInv>()
 	val internalBuffer = TerminalBufferInventory(18)
 
 	private val pendingRequests = LinkedList<StackLocateRequest>()
+    private val pendingInsertions = Int2ObjectArrayMap<PendingStackInsertion>()
 
 	private var observers = 0
 	val cachedNetItems = ItemStackCollections.intMap()
@@ -59,6 +62,7 @@ class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL), Invento
 			is DeviceRemovedPacket -> handleDeviceRemoved(packet)
 			is StackLocationPacket -> handleStackLocation(packet)
 			is ItemStackPacket -> handleItemStack(packet)
+			is CapacityPacket -> handleCapacity(packet)
 		}
 	}
 
@@ -94,6 +98,24 @@ class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL), Invento
 			val entity = ItemEntity(world!!, pos.x.toDouble(), pos.y + 1.0, pos.z.toDouble(), remaining)
 			world!!.spawnEntity(entity)
 		}
+
+		// this happens outside the normal update loop because by receiving the item stack packet
+		// we "know" how much the count in the source inventory has changed
+		updateNetItems()
+		sync()
+	}
+
+	private fun handleCapacity(packet: CapacityPacket) {
+		val insertion = pendingInsertions.values.firstOrNull {
+			ItemStackUtil.areEqualIgnoreAmounts(packet.stack, it.stack)
+		}
+		if (insertion != null) {
+			insertion.results.add(packet.capacity to packet.receivingInterface)
+			if (insertion.totalCapacity >= insertion.stack.count || counter - insertion.timestamp >= INSERTION_TIMEOUT || insertion.results.size >= inventoryCache.size) {
+				pendingInsertions.remove(insertion.bufferSlot)
+				completeInsertion(insertion)
+			}
+		}
 	}
 
 	private fun updateNetItems() {
@@ -112,6 +134,18 @@ class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL), Invento
 		}
 	}
 
+	private fun beginInsertions() {
+		if (world!!.isClient) return
+
+		for (slot in 0 until internalBuffer.size()) {
+			if (internalBuffer.getMode(slot) != TerminalBufferInventory.Mode.TO_NETWORK) continue
+			if (slot in pendingInsertions) continue
+			val stack = internalBuffer.getStack(slot)
+			pendingInsertions[slot] = PendingStackInsertion(slot, stack, counter)
+			sendToSingle(CheckCapacityPacket(stack, macAddress, MACAddress.BROADCAST))
+		}
+	}
+
 	fun addObserver() {
 		observers++
 	}
@@ -126,6 +160,7 @@ class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL), Invento
 				println(cachedNetItems)
 			} else {
 				updateNetItems()
+                beginInsertions()
 				sync()
 			}
 		}
@@ -171,6 +206,24 @@ class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL), Invento
 		}
 	}
 
+	private fun completeInsertion(insertion: PendingStackInsertion) {
+		// todo: also sort results by interface priority
+		val sortedResults = insertion.results.sortedBy { it.first }.toMutableList()
+		val remaining = insertion.stack
+		while (!remaining.isEmpty && sortedResults.isNotEmpty()) {
+			val (capacity, receivingInterface) = sortedResults.removeAt(0)
+			if (capacity <= 0) continue
+			sendToSingle(ItemStackPacket(remaining.copy(), macAddress, receivingInterface.macAddress))
+			// todo: the interface should confirm how much was actually inserted, in case of race condition
+			remaining.count -= capacity
+		}
+        internalBuffer.setStack(insertion.bufferSlot, remaining)
+
+		// as with extracting, we "know" the new amounts and so can update instantly without actually sending out packets
+		updateNetItems()
+		sync()
+	}
+
 	override fun onInventoryChanged(inv: Inventory) {
 		if (inv == internalBuffer && world != null && !world!!.isClient) {
 			markDirty()
@@ -234,3 +287,13 @@ data class StackLocateRequest(
 	val totalResultAmount: Int
 		get() = results.fold(0) { acc, (amount, _) -> acc + amount }
 }
+
+data class PendingStackInsertion(
+	val bufferSlot: Int,
+	val stack: ItemStack,
+	val timestamp: Int,
+	val results: MutableSet<Pair<Int, InterfaceBlockEntity>> = mutableSetOf(),
+) {
+	val totalCapacity: Int
+		get() = results.fold(0) { acc, (amount, _) -> acc + amount }
+}

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

@@ -14,6 +14,7 @@ class TerminalBufferInventory(size: Int): SimpleInventory(size) {
 		TO_NETWORK, FROM_NETWORK, UNASSIGNED
 	}
 
+	// todo: modes should be saved to NBT
 	private val modes = Array(size) { Mode.UNASSIGNED }
 
 	fun insertFromNetwork(stack: ItemStack): ItemStack {
@@ -56,4 +57,12 @@ class TerminalBufferInventory(size: Int): SimpleInventory(size) {
 		super.setStack(slot, stack)
 	}
 
+	fun getMode(slot: Int): Mode {
+		return modes[slot]
+	}
+
+	fun markSlot(slot: Int, mode: Mode) {
+		modes[slot] = mode
+	}
+
 }

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

@@ -83,6 +83,13 @@ class TerminalScreenHandler(syncId: Int, playerInv: PlayerInventory, val termina
 				}
 			}
 			return ItemStack.EMPTY
+		} else if (slotId in 54 until 72) {
+			// internal buffer
+			if (actionType == SlotActionType.PICKUP && !player.inventory.cursorStack.isEmpty) {
+				// placing cursor stack into buffer
+				val bufferSlot = slotId - 54 // subtract 54 to convert the handler slot ID to a valid buffer index
+				terminal.internalBuffer.markSlot(bufferSlot, TerminalBufferInventory.Mode.TO_NETWORK)
+			}
 		}
 		return super.onSlotClick(slotId, clickData, actionType, player)
 	}

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

@@ -0,0 +1,11 @@
+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
+ */
+class CapacityPacket(val stack: ItemStack, val capacity: Int, val receivingInterface: InterfaceBlockEntity, source: MACAddress, destination: MACAddress): BasePacket(source, destination) {
+}

src/main/kotlin/net/shadowfacts/phycon/network/packet/CheckCapacityPacket.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 CheckCapacityPacket(val stack: ItemStack, source: MACAddress, destination: MACAddress): BasePacket(source, destination) {
+}