package net.shadowfacts.phycon.network.block.terminal

import net.minecraft.screen.slot.Slot
import net.minecraft.screen.slot.SlotActionType
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.util.Identifier
import net.shadowfacts.phycon.PhysicalConnectivity
import net.shadowfacts.phycon.init.PhyBlocks
import net.shadowfacts.phycon.init.PhyScreens
import kotlin.math.ceil
import kotlin.math.min

/**
 * @author shadowfacts
 */
class TerminalScreenHandler(syncId: Int, playerInv: PlayerInventory, val terminal: TerminalBlockEntity): ScreenHandler(PhyScreens.TERMINAL_SCREEN_HANDLER, syncId) {

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

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

	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 (slotId in 0 until 54) {
			// the slot clicked was one of the network stacks
			if (actionType == SlotActionType.QUICK_MOVE) {
				val stack = slots[slotId].stack
				if (!stack.isEmpty && !player.world.isClient) {
					terminal.requestItem(stack, min(stack.count, stack.maxCount))
				}
			} else if (actionType == SlotActionType.PICKUP && clickData == 1) {
				if (clickData == 1) {
					// right click, request half stack
					val stack = slots[slotId].stack
					if (!stack.isEmpty && !player.world.isClient) {
						terminal.requestItem(stack, ceil(min(stack.count, stack.maxCount) / 2f).toInt())
					}
				} else {
					// todo: left click, show amount dialog
				}
			}
			return ItemStack.EMPTY
		}
		return super.onSlotClick(slotId, clickData, actionType, player)
	}
}