package net.shadowfacts.cacao

import net.minecraft.client.gui.screen.ingame.HandledScreen
import net.minecraft.client.util.math.MatrixStack
import net.minecraft.entity.player.PlayerInventory
import net.minecraft.screen.ScreenHandler
import net.minecraft.sound.SoundEvents
import net.minecraft.text.Text
import net.shadowfacts.cacao.geometry.Point
import net.shadowfacts.cacao.util.KeyModifiers
import net.shadowfacts.cacao.util.MouseButton
import net.shadowfacts.cacao.util.RenderHelper
import net.shadowfacts.cacao.window.ScreenHandlerWindow
import net.shadowfacts.cacao.window.Window
import org.lwjgl.glfw.GLFW
import org.lwjgl.opengl.GL11
import java.util.*

/**
 * @author shadowfacts
 */
open class CacaoHandledScreen<Handler: ScreenHandler>(
	handler: Handler,
	playerInv: PlayerInventory,
	title: Text,
): HandledScreen<Handler>(handler, playerInv, title), AbstractCacaoScreen {

	private val _windows = LinkedList<Window>()

	override val windows: List<Window> = _windows

	override fun <T: Window> addWindow(window: T, index: Int): T {
		if (window is ScreenHandlerWindow && window.screenHandler != handler) {
			throw RuntimeException("Adding ScreenHandlerWindow to CacaoHandledScreen with different screen handler is not supported")
		}

		_windows.add(index, window)

		window.screen = this
		window.wasAdded()
		window.resize(width, height)

		return window
	}

	override fun <T : Window> addWindow(window: T): T {
		return addWindow(window, _windows.size)
	}

	override fun removeWindow(window: Window) {
		_windows.remove(window)
		if (windows.isEmpty()) {
			onClose()
		}
	}

	override fun init() {
		super.init()

		windows.forEach {
			it.resize(width, height)
		}
	}

	override fun onClose() {
		super.onClose()

		windows.forEach {
			// todo: VC callbacks

			it.firstResponder = null
		}
	}

	override fun drawBackground(matrixStack: MatrixStack, delta: Float, mouseX: Int, mouseY: Int) {
	}

	override fun drawForeground(matrixStack: MatrixStack, mouseX: Int, mouseY: Int) {
		// no-op
	}

	override fun render(matrixStack: MatrixStack, mouseX: Int, mouseY: Int, delta: Float) {
		val mouse = Point(mouseX, mouseY)

		matrixStack.push()
		matrixStack.translate(0.0, 0.0, -350.0)

		for (i in windows.indices) {
			val it = windows[i]

			if (i == windows.size - 1) {
				renderBackground(matrixStack)
			}

			if (it is ScreenHandlerWindow) {
				if (i == windows.size - 1) {
					super.render(matrixStack, mouseX, mouseY, delta)
				} else {
					// if the screen handler window is not the frontmost, we fake the mouse x/y to disable the slot mouseover effect
					super.render(matrixStack, -1, -1, delta)
				}

				matrixStack.pop()
			}

			it.draw(matrixStack, mouse, delta)
		}

		drawMouseoverTooltip(matrixStack, mouseX, mouseY)
	}

	override fun mouseClicked(mouseX: Double, mouseY: Double, button: Int): Boolean {
		val window = windows.lastOrNull()
		val result = window?.mouseClicked(Point(mouseX, mouseY), MouseButton.fromMC(button))
		return if (result == true) {
			RenderHelper.playSound(SoundEvents.UI_BUTTON_CLICK)
			true
		} else if (window is ScreenHandlerWindow) {
			super.mouseClicked(mouseX, mouseY, button)
		} else {
			false
		}
	}

	override fun mouseDragged(mouseX: Double, mouseY: Double, button: Int, deltaX: Double, deltaY: Double): Boolean {
		val window = windows.lastOrNull()
		val startPoint = Point(mouseX, mouseY)
		val delta = Point(deltaX, deltaY)
		val result = window?.mouseDragged(startPoint, delta, MouseButton.fromMC(button))
		return if (result == true) {
			true
		} else if (window is ScreenHandlerWindow) {
			return super.mouseDragged(mouseX, mouseY, button, deltaX, deltaY)
		} else {
			false
		}
	}

	override fun mouseReleased(mouseX: Double, mouseY: Double, button: Int): Boolean {
		val window = windows.lastOrNull()
		val result = window?.mouseReleased(Point(mouseX, mouseY), MouseButton.fromMC(button))
		return if (result == true) {
			true
		} else if (window is ScreenHandlerWindow) {
			super.mouseReleased(mouseX, mouseY, button)
		} else {
			false
		}
	}

	override fun mouseScrolled(mouseX: Double, mouseY: Double, amount: Double): Boolean {
		val window = windows.lastOrNull()
		val result = window?.mouseScrolled(Point(mouseX, mouseY), amount)
		return result == true
	}

	override fun keyPressed(keyCode: Int, scanCode: Int, modifiers: Int): Boolean {
		if (keyCode == GLFW.GLFW_KEY_ESCAPE) {
			windows.lastOrNull()?.removeFromScreen()
			return true
		} else {
			val modifiersSet by lazy { KeyModifiers(modifiers) }
			if (findResponder { it.keyPressed(keyCode, modifiersSet) }) {
				return true
			}
			return super.keyPressed(keyCode, scanCode, modifiers)
		}
	}

	override fun charTyped(char: Char, modifiers: Int): Boolean {
		val modifiersSet by lazy { KeyModifiers(modifiers) }
		if (findResponder { it.charTyped(char, modifiersSet) }) {
			return true
		}
		return super.charTyped(char, modifiers)
	}

	override fun shouldCloseOnEsc(): Boolean {
		return false
	}

}