ASMR/src/main/kotlin/net/shadowfacts/cacao/util/RenderHelper.kt

package net.shadowfacts.cacao.util

import com.mojang.blaze3d.platform.GlStateManager
import net.minecraft.client.MinecraftClient
import net.minecraft.client.gui.DrawableHelper
import net.minecraft.client.sound.PositionedSoundInstance
import net.minecraft.sound.SoundEvent
import net.shadowfacts.cacao.geometry.Rect

/**
 * Helper methods for rendering using Minecraft's utilities from Cacao views.
 * For unit testing, all drawing and OpenGL interaction can be disabled by setting the `cacao.drawing.disabled` JVM property to `true`.
 *
 * @author shadowfacts
 */
object RenderHelper {

	private val disabled = (System.getProperty("cacao.drawing.disabled") ?: "false").toBoolean()

	// TODO: find a better place for this
	fun playSound(event: SoundEvent) {
		if (disabled) return
		MinecraftClient.getInstance().soundManager.play(PositionedSoundInstance.master(event, 1f))
	}

	/**
	 * Draws a solid [rect] filled with the given [color].
	 */
	fun fill(rect: Rect, color: Color) {
		if (disabled) return
		DrawableHelper.fill(rect.left.toInt(), rect.top.toInt(), rect.right.toInt(), rect.bottom.toInt(), color.argb)
	}

	/**
	 * Binds and draws the given [texture] filling the [rect].
	 */
	fun draw(rect: Rect, texture: Texture) {
		if (disabled) return
		color(1f, 1f, 1f, 1f)
		MinecraftClient.getInstance().textureManager.bindTexture(texture.location)
		draw(rect.left, rect.top, texture.u, texture.v, rect.width, rect.height, texture.width, texture.height)
	}

	/**
	 * Draws the bound texture with the given screen and texture position and size.
	 */
	fun draw(x: Double, y: Double, u: Int, v: Int, width: Double, height: Double, textureWidth: Int, textureHeight: Int) {
		if (disabled) return
		DrawableHelper.blit(x.toInt(), y.toInt(), u.toFloat(), v.toFloat(), width.toInt(), height.toInt(), textureWidth, textureHeight)
	}

	/**
	 * @see org.lwjgl.opengl.GL11.glPushMatrix
	 */
	fun pushMatrix() {
		if (disabled) return
		GlStateManager.pushMatrix()
	}

	/**
	 * @see org.lwjgl.opengl.GL11.glPopMatrix
	 */
	fun popMatrix() {
		if (disabled) return
		GlStateManager.popMatrix()
	}

	/**
	 * @see org.lwjgl.opengl.GL11.glTranslated
	 */
	fun translate(x: Double, y: Double, z: Double = 0.0) {
		if (disabled) return
		GlStateManager.translated(x, y, z)
	}

	/**
	 * @see org.lwjgl.opengl.GL11.glColor4f
	 */
	fun color(r: Float, g: Float, b: Float, alpha: Float) {
		if (disabled) return
		GlStateManager.color4f(r, g, b, alpha)
	}

}