package net.shadowfacts.cacao.view.button

import net.minecraft.client.util.math.MatrixStack
import net.minecraft.util.Identifier
import net.shadowfacts.cacao.geometry.Point
import net.shadowfacts.cacao.geometry.Size
import net.shadowfacts.cacao.util.MouseButton
import net.shadowfacts.cacao.util.texture.Texture
import net.shadowfacts.cacao.view.TextureView
import net.shadowfacts.cacao.view.View

/**
 * A button for toggling between on/off states.
 *
 * @author shadowfacts
 * @param initialState Whether the button starts as on or off.
 * @param handler The handler function to invoke when this button is pressed.
 */
class ToggleButton(
	initialState: Boolean,
	handler: ((ToggleButton) -> Unit)? = null,
): AbstractButton<ToggleButton>(TextureView(if (initialState) ON else OFF), padding = 0.0) {

	companion object {
		val OFF = Texture(Identifier("textures/gui/checkbox.png"), 0, 0, 64, 64)
		val OFF_HOVERED = Texture(Identifier("textures/gui/checkbox.png"), 20, 0, 64, 64)
		val ON = Texture(Identifier("textures/gui/checkbox.png"), 0, 20, 64, 64)
		val ON_HOVERED = Texture(Identifier("textures/gui/checkbox.png"), 20, 20, 64, 64)
	}

	private val textureView: TextureView
		get() = content as TextureView

	/**
	 * The button's current on/off state.
	 * Updating this property updates the button's texture.
	 */
	var state: Boolean = initialState

	init {
		this.handler = handler
		intrinsicContentSize = Size(20.0, 20.0)

		background = null
		disabledBackground = null
		hoveredBackground = null
	}

	override fun mouseClicked(point: Point, mouseButton: MouseButton): Boolean {
		if (!disabled && (mouseButton == MouseButton.LEFT || mouseButton == MouseButton.RIGHT)) {
			state = !state
		}

		return super.mouseClicked(point, mouseButton)
	}

	override fun draw(matrixStack: MatrixStack, mouse: Point, delta: Float) {
		val hovered = mouse in bounds
		textureView.texture = if (state) {
			if (hovered) ON_HOVERED else ON
		} else {
			if (hovered) OFF_HOVERED else OFF
		}

		super.draw(matrixStack, mouse, delta)
	}

	override fun getCurrentBackground(mouse: Point) = null

}