add proper container and do some syncy stuff and save

src/main/kotlin/org/neoflock/neocomputers/entity/RackEntity.kt

@@ -1,19 +1,113 @@
 package org.neoflock.neocomputers.entity
 
 import net.minecraft.core.BlockPos
+import net.minecraft.core.Direction
+import net.minecraft.core.HolderLookup
+import net.minecraft.core.NonNullList
+import net.minecraft.nbt.CompoundTag
+import net.minecraft.network.FriendlyByteBuf
 import net.minecraft.network.chat.Component
+import net.minecraft.server.level.ServerPlayer
+import net.minecraft.world.ContainerHelper
 import net.minecraft.world.MenuProvider
 import net.minecraft.world.entity.player.Inventory
 import net.minecraft.world.entity.player.Player
 import net.minecraft.world.inventory.AbstractContainerMenu
+import net.minecraft.world.item.ItemStack
 import net.minecraft.world.level.block.entity.BlockEntity
 import net.minecraft.world.level.block.state.BlockState
+import org.neoflock.neocomputers.NeoComputers
+import org.neoflock.neocomputers.block.DeviceBlockEntity
 import org.neoflock.neocomputers.gui.menu.RackMenu
+import org.neoflock.neocomputers.network.DeviceNode
+import org.neoflock.neocomputers.network.Networking
+import org.neoflock.neocomputers.utils.GenericContainer
+
+class RackEntity(pos: BlockPos, state: BlockState) : DeviceBlockEntity(BlockEntities.RACK_ENTITY.get(), pos, state), MenuProvider, GenericContainer {
+    val stacks: NonNullList<ItemStack> = NonNullList<ItemStack>.withSize(4, ItemStack.EMPTY)
+
+    var conns = mutableListOf(
+        -1, -1, -1, -1,
+        -1, -1, -1, -1,
+        -1, -1, -1, -1,
+        -1, -1, -1, -1
+    )
+
+    var relayMode = false
+
+    val node: DeviceNode = object : DeviceNode() {
+        override var reachability: Networking.Visibility = Networking.Visibility.NONE
+
+        override fun writeFullStateCommit(buf: FriendlyByteBuf) {
+            super.writeFullStateCommit(buf)
+            buf.writeBoolean(relayMode)
+
+
+            for (conn in conns) {
+                buf.writeInt(conn)
+            }
+        }
+
+        override fun processCommit(buf: FriendlyByteBuf) {
+            super.processCommit(buf)
+            relayMode = buf.readBoolean()
+
+            for (i in 0..15) {
+                conns[i] = buf.readInt()
+            }
+        }
+
+        override fun processScreenInteraction(player: ServerPlayer, buf: FriendlyByteBuf) {
+            super.processScreenInteraction(player, buf)
+            relayMode = buf.readBoolean()
+
+            val slot = buf.readInt()
+            NeoComputers.LOGGER.info(slot.toString())
+            for (i in 0..3) {
+                conns[slot*4+i] = buf.readInt()
+                NeoComputers.LOGGER.info("{} {}", slot*4+i, conns[slot*4+i])
+            }
+            setChanged()
+        }
+
+        override fun encodeScreenData(player: ServerPlayer, buf: FriendlyByteBuf) {
+            super.encodeScreenData(player, buf)
+            buf.writeBoolean(relayMode)
+
+            for (conn in conns) {
+                buf.writeInt(conn)
+            }
+        }
+    }
 
-class RackEntity(pos: BlockPos, state: BlockState) : BlockEntity(BlockEntities.RACK_ENTITY.get(), pos, state), MenuProvider {
     override fun getDisplayName(): Component? = Component.literal("Rack")
 
     override fun createMenu(i: Int, inventory: Inventory, player: Player): AbstractContainerMenu {
-        return RackMenu(i, inventory)
+        return RackMenu(i, inventory, this)
     }
+
+    override fun getDeviceNodes(): List<DeviceNode> = listOf(node)
+
+    override fun getNodeFromSide(directionToRequester: Direction): DeviceNode? = node
+
+    override fun loadAdditional(tag: CompoundTag, registries: HolderLookup.Provider) {
+        super.loadAdditional(tag, registries)
+        ContainerHelper.loadAllItems(tag, getItems(), registries)
+        relayMode = tag.getBoolean("relay")
+
+        val connarray = tag.getIntArray("conns")
+        if (connarray.size == 16) conns = connarray.toMutableList()
+    }
+
+    override fun saveAdditional(tag: CompoundTag, registries: HolderLookup.Provider) {
+        super.saveAdditional(tag, registries)
+        ContainerHelper.saveAllItems(tag, getItems(), registries)
+        tag.putBoolean("relay", relayMode)
+        tag.putIntArray("conns", conns.toIntArray())
+    }
+
+//    override fun getItems(): NonNullList<ItemStack> = items
+    override fun getItems(): NonNullList<ItemStack> = stacks
+
+    override fun stillValid(player: Player): Boolean = true
 }