package net.shadowfacts.phycon.block.terminal

import com.mojang.blaze3d.systems.RenderSystem
import net.minecraft.client.MinecraftClient
import net.minecraft.client.gui.DrawableHelper
import net.minecraft.client.gui.screen.ingame.HandledScreen
import net.minecraft.client.gui.widget.AbstractButtonWidget
import net.minecraft.client.gui.widget.AbstractPressableButtonWidget
import net.minecraft.client.gui.widget.ButtonWidget
import net.minecraft.client.gui.widget.TextFieldWidget
import net.minecraft.client.util.math.MatrixStack
import net.minecraft.entity.player.PlayerInventory
import net.minecraft.item.ItemStack
import net.minecraft.screen.slot.Slot
import net.minecraft.screen.slot.SlotActionType
import net.minecraft.text.LiteralText
import net.minecraft.text.Text
import net.minecraft.text.TranslatableText
import net.minecraft.util.Identifier
import net.minecraft.util.math.MathHelper
import net.shadowfacts.phycon.PhysicalConnectivity
import net.shadowfacts.phycon.networking.C2STerminalRequestItem
import net.shadowfacts.phycon.networking.C2STerminalUpdateDisplayedItems
import net.shadowfacts.phycon.util.SortMode
import net.shadowfacts.phycon.util.next
import net.shadowfacts.phycon.util.prev
import org.lwjgl.glfw.GLFW
import java.lang.NumberFormatException
import kotlin.math.ceil
import kotlin.math.floor
import kotlin.math.min
import kotlin.math.roundToInt

/**
 * @author shadowfacts
 */
// todo: translate title
class TerminalScreen(handler: TerminalScreenHandler, playerInv: PlayerInventory, title: Text): HandledScreen<TerminalScreenHandler>(handler, playerInv, title) {
	companion object {
		private val BACKGROUND = Identifier(PhysicalConnectivity.MODID, "textures/gui/terminal.png")
		private val DIALOG = Identifier(PhysicalConnectivity.MODID, "textures/gui/terminal_amount.png")
	}

	private lateinit var searchBox: TextFieldWidget
	private lateinit var sortButton: SortButton
	var sortButtonX: Int = 0
		private set
	var sortButtonY = 0
		private set
	private lateinit var amountBox: TextFieldWidget
	private var dialogStack = ItemStack.EMPTY
	private var showingAmountDialog = false
		set(value) {
			val oldValue = field
			field = value
			for (e in dialogChildren) {
				e.visible = value
			}
			amountBox.isVisible
			searchBox.setSelected(!value)
			amountBox.setSelected(value)
			if (value && !oldValue) {
				amountBox.text = "1"
			}
		}
	private var dialogChildren = mutableListOf<AbstractButtonWidget>()

	private var scrollPosition = 0f
	private var isDraggingScrollThumb = false
	private val trackMinY = 18
	private val trackHeight = 106
	private val thumbHeight = 15
	private val thumbWidth = 12
	private val scrollThumbTop: Int
		get() = trackMinY + (scrollPosition * (trackHeight - thumbHeight)).roundToInt()

	private val dialogWidth = 158
	private val dialogHeight = 62

	init {
		backgroundWidth = 252
		backgroundHeight = 222
	}

	override fun init() {
		super.init()

		children.clear()
		dialogChildren.clear()

		client!!.keyboard.setRepeatEvents(true)

		searchBox = TextFieldWidget(textRenderer, x + 138, y + 6, 80, 9, LiteralText("Search"))
		searchBox.setMaxLength(50)
		// setHasBorder is actually setDrawsBackground
		searchBox.setHasBorder(false)
		searchBox.isVisible = true
		searchBox.setSelected(true)
		searchBox.setEditableColor(0xffffff)
		addChild(searchBox)

		sortButtonX = x + 256
		sortButtonY = y
		sortButton = SortButton(sortButtonX, sortButtonY, handler.sortMode, {
			requestUpdatedItems()
		}, ::renderTooltip)
		addButton(sortButton)

		val dialogMinX = width / 2 - dialogWidth / 2
		val dialogMinY = height / 2 - dialogHeight / 2
		amountBox = TextFieldWidget(textRenderer, dialogMinX + 8, dialogMinY + 27, 80, 9, LiteralText("Amount"))
		amountBox.setHasBorder(false)
		amountBox.isVisible = false
		amountBox.setSelected(false)
		amountBox.setEditableColor(0xffffff)
		amountBox.setTextPredicate {
			if (it.isEmpty()) {
				true
			} else {
				try {
					Integer.parseInt(it) > 0
				} catch (e: NumberFormatException) {
					false
				}
			}
		}
		dialogChildren.add(amountBox)

		val plusOne = SmallButton(dialogMinX + 7, dialogMinY + 7, 28, LiteralText("+1")) {
			amountBox.intValue += 1
		}
		dialogChildren.add(plusOne)

		val plusTen = SmallButton(dialogMinX + 7 + 28 + 3, dialogMinY + 7, 28, LiteralText("+10")) {
			amountBox.intValue = ceil((amountBox.intValue + 1) / 10.0).toInt() * 10
		}
		dialogChildren.add(plusTen)

		val plusHundred = SmallButton(dialogMinX + 7 + (28 + 3) * 2, dialogMinY + 7, 28, LiteralText("+100")) {
			amountBox.intValue = ceil((amountBox.intValue + 1) / 100.0).toInt() * 100
		}
		dialogChildren.add(plusHundred)

		val minusOne = SmallButton(dialogMinX + 7, dialogMinY + 39, 28, LiteralText("-1")) {
			amountBox.intValue -= 1
		}
		dialogChildren.add(minusOne)

		val minusTen = SmallButton(dialogMinX + 7 + 28 + 3, dialogMinY + 39, 28, LiteralText("-10")) {
			amountBox.intValue = floor((amountBox.intValue - 1) / 10.0).toInt() * 10
		}
		dialogChildren.add(minusTen)

		val minusHundred = SmallButton(dialogMinX + 7 + (28 + 3) * 2, dialogMinY + 39, 28, LiteralText("-100")) {
			amountBox.intValue = floor((amountBox.intValue - 1) / 100.0).toInt() * 100
		}
		dialogChildren.add(minusHundred)

		// 101,25
		val request = ButtonWidget(dialogMinX + 101, dialogMinY + 21, 50, 20, LiteralText("Request")) {
			doDialogRequest()
		}
		dialogChildren.add(request)

		requestUpdatedItems()
	}

	private fun requestUpdatedItems() {
		val player = MinecraftClient.getInstance().player!!
		player.networkHandler.sendPacket(C2STerminalUpdateDisplayedItems(handler.terminal, searchBox.text, sortButton.mode, scrollPosition))
	}

	override fun tick() {
		super.tick()
		searchBox.tick()
		amountBox.tick()
	}

	override fun drawForeground(matrixStack: MatrixStack, mouseX: Int, mouseY: Int) {
		textRenderer.draw(matrixStack, title, 65f, 6f, 0x404040)
		textRenderer.draw(matrixStack, playerInventory.displayName, 65f, backgroundHeight - 94f, 0x404040)
		textRenderer.draw(matrixStack, TranslatableText("gui.phycon.terminal_buffer"), 7f, 6f, 0x404040)
	}

	override fun drawBackground(matrixStack: MatrixStack, delta: Float, mouseX: Int, mouseY: Int) {
		// if the dialog is open, the background gradient will be drawn in front of the main terminal gui
		if (!showingAmountDialog) {
			renderBackground(matrixStack)
		}

		RenderSystem.color4f(1f, 1f, 1f, 1f)
		client!!.textureManager.bindTexture(BACKGROUND)
		val x = (width - backgroundWidth) / 2
		val y = (height - backgroundHeight) / 2
		drawTexture(matrixStack, x, y, 0, 0, backgroundWidth, backgroundHeight)

		// scroll thumb
		drawTexture(matrixStack, x + 232, y + scrollThumbTop, 52, 230, thumbWidth, thumbHeight)
	}

	@ExperimentalUnsignedTypes
	override fun render(matrixStack: MatrixStack, mouseX: Int, mouseY: Int, delta: Float) {
		if (showingAmountDialog) {
			RenderSystem.pushMatrix()
			// items are rendered at some stupidly high z offset. item amounts at an even higher one
			RenderSystem.translatef(0f, 0f, -350f)

			// fake the mouse x/y while showing a dialog so slot mouseover highlights aren't drawn
			super.render(matrixStack, -1, -1, delta)

			RenderSystem.popMatrix()
		} else {
			super.render(matrixStack, mouseX, mouseY, delta)
		}

		searchBox.render(matrixStack, mouseX, mouseY, delta)

		if (showingAmountDialog) {
			renderBackground(matrixStack)

			RenderSystem.color4f(1f, 1f, 1f, 1f)
			client!!.textureManager.bindTexture(DIALOG)
			val dialogMinX = width / 2 - dialogWidth / 2
			val dialogMinY = height / 2 - dialogHeight / 2
			drawTexture(matrixStack, dialogMinX, dialogMinY, 0, 0, dialogWidth, dialogHeight)

			for (e in dialogChildren) {
				e.render(matrixStack, mouseX, mouseY, delta)
			}
		} else {
			drawMouseoverTooltip(matrixStack, mouseX, mouseY)
		}
	}

	@ExperimentalUnsignedTypes
	fun drawSlotUnderlay(matrixStack: MatrixStack, slot: Slot) {
		if (!handler.isBufferSlot(slot.id)) {
			return
		}

		val mode = handler.terminal.internalBuffer.getMode(slot.id - handler.bufferSlotsStart)
		val color: UInt = when (mode) {
			TerminalBufferInventory.Mode.TO_NETWORK -> 0xFFFF0000u
			TerminalBufferInventory.Mode.FROM_NETWORK -> 0xFF00FF00u
			else -> return
		}
		DrawableHelper.fill(matrixStack, slot.x, slot.y, slot.x + 16, slot.y + 16, color.toInt())
	}

	private fun isPointInsScrollThumb(mouseX: Double, mouseY: Double): Boolean {
		val x = (width - backgroundWidth) / 2
		val y = (height - backgroundHeight) / 2
		val thumbMinX = x + 232
		val thumbMaxX = thumbMinX + thumbWidth
		val thumbMinY = y + scrollThumbTop
		val thumbMaxY = thumbMinY + thumbHeight
		return mouseX >= thumbMinX && mouseX < thumbMaxX && mouseY >= thumbMinY && mouseY < thumbMaxY
	}

	override fun onMouseClick(slot: Slot?, invSlot: Int, clickData: Int, type: SlotActionType?) {
		super.onMouseClick(slot, invSlot, clickData, type)

		// don't unfocus the search box on mouse click
		searchBox.setSelected(true)

		if (slot != null && !slot.stack.isEmpty && handler.isNetworkSlot(slot.id)) {
			val stack = slot.stack

			if (type == SlotActionType.QUICK_MOVE) {
				// shift click, request full stack
				requestItem(stack, min(stack.count, stack.maxCount))
			} else if (type == SlotActionType.PICKUP) {
				if (clickData == 1) {
					// right click, request half stack
					requestItem(stack, ceil(min(stack.count, stack.maxCount) / 2f).toInt())
				} else {
					dialogStack = stack
					showingAmountDialog = true
					searchBox.setSelected(false)
				}
			}
		}
	}

	override fun mouseClicked(mouseX: Double, mouseY: Double, button: Int): Boolean {
		if (showingAmountDialog) {
			for (e in dialogChildren) {
				if (e.mouseClicked(mouseX, mouseY, button)) {
					return true
				}
			}
			return false
		} else {
			if (isPointInsScrollThumb(mouseX, mouseY)) {
				isDraggingScrollThumb = true
				return true
			}

			return super.mouseClicked(mouseX, mouseY, button)
		}
	}

	override fun mouseDragged(mouseX: Double, mouseY: Double, button: Int, deltaX: Double, deltaY: Double): Boolean {
		if (showingAmountDialog) {
			return false
		} else if (isDraggingScrollThumb) {
			scrollPosition = (mouseY.toFloat() - (y + trackMinY) - 7.5f) / (trackHeight - 15)
			scrollPosition = MathHelper.clamp(scrollPosition, 0f, 1f)
			requestUpdatedItems()
			return true
		} else {
			return super.mouseDragged(mouseX, mouseY, button, deltaX, deltaY)
		}
	}

	override fun mouseMoved(d: Double, e: Double) {
		if (showingAmountDialog) {
		} else {
			super.mouseMoved(d, e)
		}
	}

	override fun mouseReleased(d: Double, e: Double, i: Int): Boolean {
		if (showingAmountDialog) {
			return false
		} else {
			isDraggingScrollThumb = false

			return super.mouseReleased(d, e, i)
		}
	}

	override fun mouseScrolled(mouseX: Double, mouseY: Double, amount: Double): Boolean {
		if (showingAmountDialog) {
			return false
		} else {
			var newOffsetInRows = handler.currentScrollOffsetInRows() - amount.toInt()
			newOffsetInRows = MathHelper.clamp(newOffsetInRows, 0, handler.maxScrollOffsetInRows())
			val newScrollPosition = newOffsetInRows / handler.maxScrollOffsetInRows().toFloat()
			scrollPosition = newScrollPosition
			requestUpdatedItems()

			return super.mouseScrolled(mouseX, mouseY, amount)
		}
	}

	override fun charTyped(c: Char, i: Int): Boolean {
		if (showingAmountDialog) {
			return amountBox.charTyped(c, i)
		} else {
			val oldText = searchBox.text
			if (searchBox.charTyped(c, i)) {
				if (searchBox.text != oldText) {
					scrollPosition = 0f
					requestUpdatedItems()
				}
				return true
			}

			return super.charTyped(c, i)
		}
	}

	override fun keyPressed(key: Int, j: Int, k: Int): Boolean {
		if (showingAmountDialog) {
			return when (key) {
				GLFW.GLFW_KEY_ESCAPE -> {
					showingAmountDialog = false
					true
				}
				GLFW.GLFW_KEY_ENTER -> {
					doDialogRequest()
					true
				}
				else -> {
					amountBox.keyPressed(key, j, k)
				}
			}
		} else {
			val oldText = searchBox.text
			if (searchBox.keyPressed(key, j, k)) {
				if (searchBox.text != oldText) {
					scrollPosition = 0f
					requestUpdatedItems()
				}
				return true
			}
			return if (searchBox.isFocused && searchBox.isVisible && key != GLFW.GLFW_KEY_ESCAPE) {
				true
			} else {
				super.keyPressed(key, j, k)
			}
		}
	}

	private fun doDialogRequest() {
		showingAmountDialog = false
		requestItem(dialogStack, amountBox.intValue)
	}

	private fun requestItem(stack: ItemStack, amount: Int) {
		val netHandler = MinecraftClient.getInstance().player!!.networkHandler
		val packet = C2STerminalRequestItem(handler.terminal, stack, amount)
		netHandler.sendPacket(packet)
	}

	private var TextFieldWidget.intValue: Int
		get() = if (text.isEmpty()) 0 else Integer.parseInt(text)
		set(value) {
			text = value.toString()
			setSelected(true)
		}

	class SmallButton(x: Int, y: Int, width: Int, title: Text, action: PressAction): ButtonWidget(x, y, width, 14, title, action) {
		@ExperimentalUnsignedTypes
		override fun renderButton(matrixStack: MatrixStack, mouseX: Int, mouseY: Int, delta: Float) {
			val client = MinecraftClient.getInstance()
			client.textureManager.bindTexture(DIALOG)
			RenderSystem.color4f(1f, 1f, 1f, 1f)
			val v = if (isHovered) 142 else 128
			RenderSystem.enableBlend()
			RenderSystem.defaultBlendFunc()
			RenderSystem.enableDepthTest()
			drawTexture(matrixStack, x, y, 0, v, width / 2, height)
			drawTexture(matrixStack, x + width / 2, y, 200 - width / 2, v, width / 2, height)
			drawCenteredText(matrixStack, client.textRenderer, message, x + width / 2, y + (height - 8) / 2, 0xffffffffu.toInt())
		}
	}

	class SortButton(
		x: Int,
		y: Int,
		var mode: SortMode,
		val onChange: (SortMode) -> Unit,
		val doRenderTooltip: (MatrixStack, Text, Int, Int) -> Unit
	): AbstractPressableButtonWidget(x, y, 20, 20, LiteralText("")) {
		override fun onPress() {}

		override fun mouseClicked(mouseX: Double, mouseY: Double, button: Int): Boolean {
			if ((button == 0 || button == 1) && clicked(mouseX, mouseY)) {
				val newVal = if (button == 0) mode.next else mode.prev
				mode = newVal
				onChange(mode)

				playDownSound(MinecraftClient.getInstance().soundManager)
				return true
			}
			return false
		}

		override fun renderButton(matrixStack: MatrixStack, mouseX: Int, mouseY: Int, delta: Float) {
			val client = MinecraftClient.getInstance()
			RenderSystem.color4f(1f, 1f, 1f, 1f)
			RenderSystem.enableBlend()
			RenderSystem.defaultBlendFunc()
			RenderSystem.enableDepthTest()

			client.textureManager.bindTexture(WIDGETS_LOCATION)
			val k = getYImage(isHovered)
			drawTexture(matrixStack, x, y, 0, 46 + k * 20, width / 2, height)
			drawTexture(matrixStack, x + width / 2, y, 200 - width / 2, 46 + k * 20, width / 2, height)

			client.textureManager.bindTexture(BACKGROUND)
			val u: Int = when (mode) {
				SortMode.COUNT_HIGH_FIRST -> 0
				SortMode.COUNT_LOW_FIRST -> 16
				SortMode.ALPHABETICAL -> 32
			}
			drawTexture(matrixStack, x + 2, y + 2, u, 230, 16, 16)

			if (isHovered) {
				renderToolTip(matrixStack, mouseX, mouseY)
			}
		}

		override fun renderToolTip(matrixStack: MatrixStack, mouseX: Int, mouseY: Int) {
			val text = LiteralText("")
			text.append("Sort by: ")
			text.append(mode.tooltip)
			doRenderTooltip(matrixStack, text, mouseX, mouseY)
		}
	}

}