@file:UseSerializers(DashlessUUIDSerializer::class)

package moe.nea.firmament.features.inventory

import com.mojang.blaze3d.systems.RenderSystem
import java.util.UUID
import org.lwjgl.glfw.GLFW
import kotlinx.serialization.Serializable
import kotlinx.serialization.UseSerializers
import kotlinx.serialization.serializer
import net.minecraft.client.gui.screen.ingame.HandledScreen
import net.minecraft.entity.player.PlayerInventory
import net.minecraft.screen.GenericContainerScreenHandler
import net.minecraft.screen.slot.Slot
import net.minecraft.screen.slot.SlotActionType
import net.minecraft.util.Identifier
import moe.nea.firmament.annotations.Subscribe
import moe.nea.firmament.events.HandledScreenForegroundEvent
import moe.nea.firmament.events.HandledScreenKeyPressedEvent
import moe.nea.firmament.events.HandledScreenKeyReleasedEvent
import moe.nea.firmament.events.IsSlotProtectedEvent
import moe.nea.firmament.events.ScreenChangeEvent
import moe.nea.firmament.events.SlotRenderEvents
import moe.nea.firmament.features.FirmamentFeature
import moe.nea.firmament.gui.config.ManagedConfig
import moe.nea.firmament.keybindings.SavedKeyBinding
import moe.nea.firmament.mixins.accessor.AccessorHandledScreen
import moe.nea.firmament.util.CommonSoundEffects
import moe.nea.firmament.util.MC
import moe.nea.firmament.util.SBData
import moe.nea.firmament.util.SkyBlockIsland
import moe.nea.firmament.util.data.ProfileSpecificDataHolder
import moe.nea.firmament.util.json.DashlessUUIDSerializer
import moe.nea.firmament.util.mc.ScreenUtil.getSlotByIndex
import moe.nea.firmament.util.mc.SlotUtils.swapWithHotBar
import moe.nea.firmament.util.mc.displayNameAccordingToNbt
import moe.nea.firmament.util.mc.loreAccordingToNbt
import moe.nea.firmament.util.render.drawGuiTexture
import moe.nea.firmament.util.render.drawLine
import moe.nea.firmament.util.skyblockUUID
import moe.nea.firmament.util.unformattedString

object SlotLocking : FirmamentFeature {
	override val identifier: String
		get() = "slot-locking"

	@Serializable
	data class Data(
		val lockedSlots: MutableSet<Int> = mutableSetOf(),
		val lockedSlotsRift: MutableSet<Int> = mutableSetOf(),
		val lockedUUIDs: MutableSet<UUID> = mutableSetOf(),
		val boundSlots: MutableMap<Int, Int> = mutableMapOf()
	)

	object TConfig : ManagedConfig(identifier, Category.INVENTORY) {
		val lockSlot by keyBinding("lock") { GLFW.GLFW_KEY_L }
		val lockUUID by keyBindingWithOutDefaultModifiers("lock-uuid") {
			SavedKeyBinding(GLFW.GLFW_KEY_L, shift = true)
		}
		val slotBind by keyBinding("bind") { GLFW.GLFW_KEY_L }
		val slotBindRequireShift by toggle("require-quick-move") { true }
	}

	override val config: TConfig
		get() = TConfig

	object DConfig : ProfileSpecificDataHolder<Data>(serializer(), "locked-slots", ::Data)

	val lockedUUIDs get() = DConfig.data?.lockedUUIDs

	val lockedSlots
		get() = when (SBData.skyblockLocation) {
			SkyBlockIsland.RIFT -> DConfig.data?.lockedSlotsRift
			null -> null
			else -> DConfig.data?.lockedSlots
		}

	fun isSalvageScreen(screen: HandledScreen<*>?): Boolean {
		if (screen == null) return false
		return screen.title.unformattedString.contains("Salvage Item")
	}

	fun isTradeScreen(screen: HandledScreen<*>?): Boolean {
		if (screen == null) return false
		val handler = screen.screenHandler as? GenericContainerScreenHandler ?: return false
		if (handler.inventory.size() < 9) return false
		val middlePane = handler.inventory.getStack(handler.inventory.size() - 5)
		if (middlePane == null) return false
		return middlePane.displayNameAccordingToNbt?.unformattedString == "⇦ Your stuff"
	}

	fun isNpcShop(screen: HandledScreen<*>?): Boolean {
		if (screen == null) return false
		val handler = screen.screenHandler as? GenericContainerScreenHandler ?: return false
		if (handler.inventory.size() < 9) return false
		val sellItem = handler.inventory.getStack(handler.inventory.size() - 5)
		if (sellItem == null) return false
		if (sellItem.displayNameAccordingToNbt?.unformattedString == "Sell Item") return true
		val lore = sellItem.loreAccordingToNbt
		return (lore.lastOrNull() ?: return false).unformattedString == "Click to buyback!"
	}

	@Subscribe
	fun onSalvageProtect(event: IsSlotProtectedEvent) {
		if (event.slot == null) return
		if (!event.slot.hasStack()) return
		if (event.slot.stack.displayNameAccordingToNbt?.unformattedString != "Salvage Items") return
		val inv = event.slot.inventory
		var anyBlocked = false
		for (i in 0 until event.slot.index) {
			val stack = inv.getStack(i)
			if (IsSlotProtectedEvent.shouldBlockInteraction(null, SlotActionType.THROW, stack))
				anyBlocked = true
		}
		if (anyBlocked) {
			event.protectSilent()
		}
	}

	@Subscribe
	fun onProtectUuidItems(event: IsSlotProtectedEvent) {
		val doesNotDeleteItem = event.actionType == SlotActionType.SWAP
			|| event.actionType == SlotActionType.PICKUP
			|| event.actionType == SlotActionType.QUICK_MOVE
			|| event.actionType == SlotActionType.QUICK_CRAFT
			|| event.actionType == SlotActionType.CLONE
			|| event.actionType == SlotActionType.PICKUP_ALL
		val isSellOrTradeScreen =
			isNpcShop(MC.handledScreen) || isTradeScreen(MC.handledScreen) || isSalvageScreen(MC.handledScreen)
		if ((!isSellOrTradeScreen || event.slot?.inventory !is PlayerInventory)
			&& doesNotDeleteItem
		) return
		val stack = event.itemStack ?: return
		val uuid = stack.skyblockUUID ?: return
		if (uuid in (lockedUUIDs ?: return)) {
			event.protect()
		}
	}

	@Subscribe
	fun onProtectSlot(it: IsSlotProtectedEvent) {
		if (it.slot != null && it.slot.inventory is PlayerInventory && it.slot.index in (lockedSlots ?: setOf())) {
			it.protect()
		}
	}

	@Subscribe
	fun onQuickMoveBoundSlot(it: IsSlotProtectedEvent) {
		val boundSlots = DConfig.data?.boundSlots ?: mapOf()
		val isValidAction =
			it.actionType == SlotActionType.QUICK_MOVE || (it.actionType == SlotActionType.PICKUP && !TConfig.slotBindRequireShift)
		if (!isValidAction) return
		val handler = MC.handledScreen?.screenHandler ?: return
		val slot = it.slot
		if (slot != null && it.slot.inventory is PlayerInventory) {
			val boundSlot = boundSlots.entries.find {
				it.value == slot.index || it.key == slot.index
			} ?: return
			it.protectSilent()
			val inventorySlot = MC.handledScreen?.getSlotByIndex(boundSlot.value, true)
			inventorySlot?.swapWithHotBar(handler, boundSlot.key)
		}
	}

	@Subscribe
	fun onLockUUID(it: HandledScreenKeyPressedEvent) {
		if (!it.matches(TConfig.lockUUID)) return
		val inventory = MC.handledScreen ?: return
		inventory as AccessorHandledScreen

		val slot = inventory.focusedSlot_Firmament ?: return
		val stack = slot.stack ?: return
		val uuid = stack.skyblockUUID ?: return
		val lockedUUIDs = lockedUUIDs ?: return
		if (uuid in lockedUUIDs) {
			lockedUUIDs.remove(uuid)
		} else {
			lockedUUIDs.add(uuid)
		}
		DConfig.markDirty()
		CommonSoundEffects.playSuccess()
		it.cancel()
	}


	@Subscribe
	fun onLockSlotKeyRelease(it: HandledScreenKeyReleasedEvent) {
		val inventory = MC.handledScreen ?: return
		inventory as AccessorHandledScreen
		val slot = inventory.focusedSlot_Firmament
		val storedSlot = storedLockingSlot ?: return

		if (it.matches(TConfig.slotBind) && slot != storedSlot && slot != null && slot.isHotbar() != storedSlot.isHotbar()) {
			storedLockingSlot = null
			val hotBarSlot = if (slot.isHotbar()) slot else storedSlot
			val invSlot = if (slot.isHotbar()) storedSlot else slot
			val boundSlots = DConfig.data?.boundSlots ?: return
			lockedSlots?.remove(hotBarSlot.index)
			lockedSlots?.remove(invSlot.index)
			boundSlots.entries.removeIf {
				it.value == invSlot.index
			}
			boundSlots[hotBarSlot.index] = invSlot.index
			DConfig.markDirty()
			CommonSoundEffects.playSuccess()
			return
		}
		if (it.matches(TConfig.lockSlot) && slot == storedSlot) {
			storedLockingSlot = null
			toggleSlotLock(slot)
			return
		}
		if (it.matches(TConfig.slotBind)) {
			storedLockingSlot = null
		}
	}

	@Subscribe
	fun onRenderAllBoundSlots(event: HandledScreenForegroundEvent) {
		val boundSlots = DConfig.data?.boundSlots ?: return
		fun findByIndex(index: Int) = event.screen.getSlotByIndex(index, true)
		val accScreen = event.screen as AccessorHandledScreen
		val sx = accScreen.x_Firmament
		val sy = accScreen.y_Firmament
		boundSlots.entries.forEach {
			val hotbarSlot = findByIndex(it.key) ?: return@forEach
			val inventorySlot = findByIndex(it.value) ?: return@forEach

			val (hotX, hotY) = hotbarSlot.lineCenter()
			val (invX, invY) = inventorySlot.lineCenter()
			event.context.drawLine(
				invX + sx, invY + sy,
				hotX + sx, hotY + sy,
				me.shedaniel.math.Color.ofOpaque(0x00FF00)
			)
			event.context.drawBorder(hotbarSlot.x + sx,
			                         hotbarSlot.y + sy,
			                         16, 16, 0xFF00FF00u.toInt())
			event.context.drawBorder(inventorySlot.x + sx,
			                         inventorySlot.y + sy,
			                         16, 16, 0xFF00FF00u.toInt())
		}
	}

	@Subscribe
	fun onRenderCurrentDraggingSlot(event: HandledScreenForegroundEvent) {
		val draggingSlot = storedLockingSlot ?: return
		val accScreen = event.screen as AccessorHandledScreen
		val hoveredSlot = accScreen.focusedSlot_Firmament
			?.takeIf { it.inventory is PlayerInventory }
			?.takeIf { it == draggingSlot || it.isHotbar() != draggingSlot.isHotbar() }
		val sx = accScreen.x_Firmament
		val sy = accScreen.y_Firmament
		val (borderX, borderY) = draggingSlot.lineCenter()
		event.context.drawBorder(draggingSlot.x + sx, draggingSlot.y + sy, 16, 16, 0xFF00FF00u.toInt())
		if (hoveredSlot == null) {
			event.context.drawLine(
				borderX + sx, borderY + sy,
				event.mouseX, event.mouseY,
				me.shedaniel.math.Color.ofOpaque(0x00FF00)
			)
		} else if (hoveredSlot != draggingSlot) {
			val (hovX, hovY) = hoveredSlot.lineCenter()
			event.context.drawLine(
				borderX + sx, borderY + sy,
				hovX + sx, hovY + sy,
				me.shedaniel.math.Color.ofOpaque(0x00FF00)
			)
			event.context.drawBorder(hoveredSlot.x + sx,
			                         hoveredSlot.y + sy,
			                         16, 16, 0xFF00FF00u.toInt())
		}
	}

	fun Slot.lineCenter(): Pair<Int, Int> {
		return if (isHotbar()) {
			x + 9 to y
		} else {
			x + 9 to y + 17
		}
	}


	fun Slot.isHotbar(): Boolean {
		return index < 9
	}

	@Subscribe
	fun onScreenChange(event: ScreenChangeEvent) {
		storedLockingSlot = null
	}

	var storedLockingSlot: Slot? = null

	fun toggleSlotLock(slot: Slot) {
		val lockedSlots = lockedSlots ?: return
		val boundSlots = DConfig.data?.boundSlots ?: mutableMapOf()
		if (slot.inventory is PlayerInventory) {
			if (boundSlots.entries.removeIf {
					it.value == slot.index || it.key == slot.index
				}) {
				// intentionally do nothing
			} else if (slot.index in lockedSlots) {
				lockedSlots.remove(slot.index)
			} else {
				lockedSlots.add(slot.index)
			}
			DConfig.markDirty()
			CommonSoundEffects.playSuccess()
		}
	}

	@Subscribe
	fun onLockSlot(it: HandledScreenKeyPressedEvent) {
		val inventory = MC.handledScreen ?: return
		inventory as AccessorHandledScreen

		val slot = inventory.focusedSlot_Firmament ?: return
		if (slot.inventory !is PlayerInventory) return
		if (it.matches(TConfig.slotBind)) {
			storedLockingSlot = storedLockingSlot ?: slot
			return
		}
		if (!it.matches(TConfig.lockSlot)) {
			return
		}
		toggleSlotLock(slot)
	}

	@Subscribe
	fun onRenderSlotOverlay(it: SlotRenderEvents.After) {
		val isSlotLocked = it.slot.inventory is PlayerInventory && it.slot.index in (lockedSlots ?: setOf())
		val isUUIDLocked = (it.slot.stack?.skyblockUUID) in (lockedUUIDs ?: setOf())
		if (isSlotLocked || isUUIDLocked) {
			RenderSystem.disableDepthTest()
			it.context.drawGuiTexture(
				it.slot.x, it.slot.y, 0,
				16, 16,
				when {
					isSlotLocked ->
						(Identifier.of("firmament:slot_locked"))

					isUUIDLocked ->
						(Identifier.of("firmament:uuid_locked"))

					else ->
						error("unreachable")
				}
			)
			RenderSystem.enableDepthTest()
		}
	}
}