package net.shadowfacts.phycon.block.inserter

import net.minecraft.entity.player.PlayerEntity
import net.minecraft.entity.player.PlayerInventory
import net.minecraft.item.ItemStack
import net.minecraft.network.PacketByteBuf
import net.minecraft.screen.ScreenHandler
import net.minecraft.screen.slot.Slot
import net.minecraft.screen.slot.SlotActionType
import net.minecraft.util.Identifier
import net.shadowfacts.phycon.PhysicalConnectivity
import net.shadowfacts.phycon.init.PhyBlocks
import net.shadowfacts.phycon.init.PhyScreens
import net.shadowfacts.phycon.util.GhostSlot
import net.shadowfacts.phycon.util.copyWithCount
import kotlin.math.min

/**
 * @author shadowfacts
 */
class InserterScreenHandler(
	syncId: Int,
	playerInv: PlayerInventory,
	val inserter: InserterBlockEntity,
): ScreenHandler(PhyScreens.INSERTER, syncId) {

	companion object {
		val ID = Identifier(PhysicalConnectivity.MODID, "inserter")
	}

	constructor(syncId: Int, playerInv: PlayerInventory, buf: PacketByteBuf):
			this(
				syncId,
				playerInv,
				PhyBlocks.INSERTER.getBlockEntity(playerInv.player.world, buf.readBlockPos())!!
			)

	init {
		// fake slot
		addSlot(GhostSlot(inserter, 31, 20))

		// player inv
		for (y in 0 until 3) {
			for (x in 0 until 9) {
				addSlot(Slot(playerInv, x + y * 9 + 9, 8 + x * 18, 51 + y * 18))
			}
		}

		// hotbar
		for (x in 0 until 9) {
			addSlot(Slot(playerInv, x, 8 + x * 18, 109))
		}
	}

	private fun stackToExtractChanged() {
		inserter.amountToExtract = min(inserter.stackToExtract.maxCount, inserter.amountToExtract)
	}

	override fun canUse(player: PlayerEntity): Boolean {
		return true
	}

	override fun onSlotClick(slotId: Int, clickData: Int, actionType: SlotActionType, player: PlayerEntity) {
		// fake slot
		if (slotId == 0) {
			if (cursorStack.isEmpty) {
				inserter.stackToExtract = ItemStack.EMPTY
			} else {
				inserter.stackToExtract = cursorStack.copyWithCount(1)
			}
			stackToExtractChanged()
		}
		super.onSlotClick(slotId, clickData, actionType, player)
	}

	override fun transferSlot(player: PlayerEntity, slotId: Int): ItemStack {
		val slot = slots[slotId]
		inserter.stackToExtract = slot.stack.copyWithCount(1)
		stackToExtractChanged()
		return ItemStack.EMPTY
	}

}