package electroblob.wizardry.client.renderer;

import org.lwjgl.opengl.GL11;

import electroblob.wizardry.Wizardry;
import electroblob.wizardry.tileentity.TileEntityMagicLight;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.client.renderer.OpenGlHelper;
import net.minecraft.client.renderer.RenderHelper;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.VertexBuffer;
import net.minecraft.client.renderer.tileentity.TileEntitySpecialRenderer;
import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
import net.minecraft.util.ResourceLocation;

public class RenderMagicLight extends TileEntitySpecialRenderer<TileEntityMagicLight> {

	private static final ResourceLocation texture = new ResourceLocation(Wizardry.MODID, "textures/entity/light_ray.png");
	private static final ResourceLocation texture2 = new ResourceLocation(Wizardry.MODID, "textures/entity/light_aura.png");

	@Override
	public void renderTileEntityAt(TileEntityMagicLight tileentity, double x, double y, double z, float f, int destroyStage){

		GlStateManager.pushMatrix();

		GlStateManager.disableCull();
		GlStateManager.enableBlend();
		GlStateManager.shadeModel(GL11.GL_SMOOTH);
		GlStateManager.disableLighting();
		OpenGlHelper.setLightmapTextureCoords(OpenGlHelper.lightmapTexUnit, 240f, 240f);
		RenderHelper.disableStandardItemLighting();

		GlStateManager.translate(x + 0.5, y + 0.5, z + 0.5);

		if(tileentity.timer < 10){
			GlStateManager.scale((float)tileentity.timer/10, (float)tileentity.timer/10, (float)tileentity.timer/10);
		}
		if(tileentity.timer > tileentity.maxTimer-10){
			GlStateManager.scale((float)(tileentity.maxTimer-tileentity.timer)/10, (float)(tileentity.maxTimer-tileentity.timer)/10, (float)(tileentity.maxTimer-tileentity.timer)/10);
		}

		// Renders the aura effect

		Tessellator tessellator = Tessellator.getInstance();
		VertexBuffer buffer = tessellator.getBuffer();

		GlStateManager.pushMatrix();

		GlStateManager.blendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);

		// This counteracts the reverse rotation behaviour when in front f5 view.
		// Fun fact: this is a bug with vanilla too! Look at a snowball in front f5 view, for example.
		float yaw = Minecraft.getMinecraft().gameSettings.thirdPersonView == 2 ? Minecraft.getMinecraft().getRenderManager().playerViewX : -Minecraft.getMinecraft().getRenderManager().playerViewX;
		GlStateManager.rotate(180.0F - Minecraft.getMinecraft().getRenderManager().playerViewY, 0.0F, 1.0F, 0.0F);
		GlStateManager.rotate(yaw, 1.0F, 0.0F, 0.0F);

		buffer.begin(GL11.GL_QUADS, DefaultVertexFormats.POSITION_TEX);

		this.bindTexture(texture2);

		buffer.pos(-0.6, 0.6, 0).tex(0, 0).endVertex();
		buffer.pos(0.6, 0.6, 0).tex(1, 0).endVertex();
		buffer.pos(0.6, -0.6, 0).tex(1, 1).endVertex();
		buffer.pos(-0.6, -0.6, 0).tex(0, 1).endVertex();

		tessellator.draw();

		GlStateManager.popMatrix();

		// Renders the rays

		// For some reason, the old blend function (GL11.GL_SRC_ALPHA, GL11.GL_SRC_ALPHA) caused the innermost
		// ends of the rays to appear black, so I have changed it to this, which looks very slightly different.
		GlStateManager.blendFunc(GL11.GL_ONE, GL11.GL_SRC_ALPHA);

		this.bindTexture(texture);
		
		if(tileentity.randomiser.length >= 30){
			for(int j=0; j<30; j++){
	
				int sliceAngle = 20 + tileentity.randomiser[j];
				float scale = 0.5f;
	
				GlStateManager.pushMatrix();
	
				GlStateManager.rotate(31*tileentity.randomiser[j], 1, 0, 0);
				GlStateManager.rotate(31*tileentity.randomiser2[j], 0, 0, 1);
	
				/*
				 * OK, so here are the changes to rendering as far as I know:
				 * Vertex formats specify how the methods are arranged
				 * Color has to be called for every vertex, I think.
				 * The new methods thing is a bit weird, because other than the number of arguments there is
				 * essentially no difference between pos, tex, color, normal and lightmap. At least they make
				 * the code more readable.
				 */
				
				buffer.begin(5, DefaultVertexFormats.POSITION_TEX_COLOR);
	
				buffer.pos(0, 0, 0).tex(0, 0).color(255, 255, 255, 0).endVertex();
				buffer.pos(0, 0, 0).tex(0, 1).color(255, 255, 255, 0).endVertex();
	
				double x1 = scale*Math.sin((tileentity.timer + 40*j)*(Math.PI/180));
				//double y1 = 0.7*Math.cos((timerentity.timer - 40*j)*(Math.PI/180))*j/10;
				double z1 = scale*Math.cos((tileentity.timer + 40*j)*(Math.PI/180));
	
				double x2 = scale*Math.sin((tileentity.timer + 40*j - sliceAngle)*(Math.PI/180));
				//double y2 = 0.7*Math.sin((timerentity.timer - 40*j)*(Math.PI/180))*j/10;
				double z2 = scale*Math.cos((tileentity.timer + 40*j - sliceAngle)*(Math.PI/180));
	
				buffer.pos(x1, 0, z1).tex(1, 0).color(0, 0, 0, 255).endVertex();
				buffer.pos(x2, 0, z2).tex(1, 1).color(0, 0, 0, 255).endVertex();
	
				tessellator.draw();
	
				GlStateManager.popMatrix();
			}
		}

		GlStateManager.shadeModel(GL11.GL_FLAT);
		GlStateManager.enableCull();
		GlStateManager.disableBlend();
		GlStateManager.enableLighting();
		RenderHelper.enableStandardItemLighting();

		GlStateManager.popMatrix();
	}

}