bunch of cards

src/main/kotlin/org/neoflock/neocomputers/item/TunnelCard.kt

@@ -0,0 +1,39 @@
+package org.neoflock.neocomputers.item
+
+import net.minecraft.network.chat.Component
+import net.minecraft.world.item.Item
+import net.minecraft.world.item.ItemStack
+import net.minecraft.world.item.TooltipFlag
+import org.neoflock.neocomputers.gui.widget.ComponentRoles
+import org.neoflock.neocomputers.network.Networking
+import org.neoflock.neocomputers.utils.Formatting
+
+class TunnelCard: Item(Properties()), ComponentItem {
+    // yes, we're counting TUNNEL as a conventional networking card
+    override fun getComponentRoles(itemStack: ItemStack): Set<String> = setOf(ComponentRoles.CARD, ComponentRoles.NETWORK)
+
+    override fun getComponentTier(itemStack: ItemStack): Int = 3
+
+    override fun whenComponentPlaced(itemStack: ItemStack, newRole: String) {
+        ensureHasAddress(itemStack)
+        super.whenComponentPlaced(itemStack, newRole)
+    }
+
+    // TODO: Tunnel Component
+    override fun toComponentNode(itemStack: ItemStack): Networking.Node? = null
+
+    override fun appendHoverText(
+        itemStack: ItemStack,
+        tooltipContext: TooltipContext,
+        list: MutableList<Component?>,
+        tooltipFlag: TooltipFlag
+    ) {
+        if(tooltipFlag.isAdvanced) {
+            val addr = itemStack.get(DataComponents.ADDRESS)
+            val addrComp = if(addr == null) Component.translatable("neocomputers.noaddr") else Component.literal(addr)
+            list.addLast(addrComp)
+            // TODO: show max packet size and whatnot
+        }
+        super.appendHoverText(itemStack, tooltipContext, list, tooltipFlag)
+    }
+}