/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2014, AlgorithmX2, All rights reserved.
 *
 * Applied Energistics 2 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Applied Energistics 2 is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.tile.crafting;

import java.util.Random;

import appeng.mixins.RenderPhaseMixin;
import net.fabricmc.api.EnvType;
import net.minecraft.client.MinecraftClient;
import net.minecraft.client.render.*;
import net.minecraft.client.render.block.entity.BlockEntityRenderDispatcher;
import net.minecraft.client.render.block.entity.BlockEntityRenderer;
import net.minecraft.client.render.item.ItemRenderer;
import net.minecraft.client.texture.SpriteAtlasTexture;
import net.minecraft.client.util.ModelIdentifier;
import net.minecraft.client.util.math.MatrixStack;

import org.lwjgl.opengl.GL11;

import net.minecraft.client.render.model.BakedModel;
import net.minecraft.client.render.model.json.ModelTransformation;
import net.minecraft.item.BlockItem;
import net.minecraft.item.ItemStack;
import net.minecraft.util.Identifier;
import net.fabricmc.api.Environment;

import appeng.client.render.effects.ParticleTypes;
import appeng.core.AppEng;

/**
 * Renders the item currently being crafted by the molecular assembler, as well
 * as the light strip when it's powered.
 */
@Environment(EnvType.CLIENT)
public class MolecularAssemblerRenderer extends BlockEntityRenderer<MolecularAssemblerBlockEntity> {

    public static final ModelIdentifier LIGHTS_MODEL = new ModelIdentifier(AppEng.makeId(
            "block/molecular_assembler_lights"), "");

    private static final RenderLayer MC_161917_RENDERTYPE_FIX = createRenderType();

    private final Random particleRandom = new Random();

    public MolecularAssemblerRenderer(BlockEntityRenderDispatcher rendererDispatcherIn) {
        super(rendererDispatcherIn);
    }

    @Override
    public void render(MolecularAssemblerBlockEntity molecularAssembler, float partialTicks, MatrixStack ms,
                       VertexConsumerProvider bufferIn, int combinedLightIn, int combinedOverlayIn) {

        AssemblerAnimationStatus status = molecularAssembler.getAnimationStatus();
        if (status != null) {
            if (!MinecraftClient.getInstance().isPaused()) {
                if (status.isExpired()) {
                    molecularAssembler.setAnimationStatus(null);
                }

                status.setAccumulatedTicks(status.getAccumulatedTicks() + partialTicks);
                status.setTicksUntilParticles(status.getTicksUntilParticles() - partialTicks);
            }

            renderStatus(molecularAssembler, ms, bufferIn, combinedLightIn, status);
        }

        if (molecularAssembler.isPowered()) {
            renderPowerLight(ms, bufferIn, combinedLightIn, combinedOverlayIn);
        }
    }

    private void renderPowerLight(MatrixStack ms, VertexConsumerProvider bufferIn, int combinedLightIn,
                                  int combinedOverlayIn) {
        // Render the translucent light overlay here instead of in the block, because
        // thanks to the following MC
        // bug, our particles would otherwise not be visible (because the glass pane
        // would also render as translucent,
        // even the fully transparent part)
        // https://bugs.mojang.com/browse/MC-161917
        MinecraftClient minecraft = MinecraftClient.getInstance();
        BakedModel lightsModel = minecraft.getBakedModelManager().getModel(LIGHTS_MODEL);
        VertexConsumer buffer = bufferIn.getBuffer(MC_161917_RENDERTYPE_FIX);

        minecraft.getBlockRenderManager().getModelRenderer().render(ms.peek(), buffer, null,
                lightsModel, 1, 1, 1, combinedLightIn, combinedOverlayIn);
    }

    private void renderStatus(MolecularAssemblerBlockEntity molecularAssembler, MatrixStack ms,
                              VertexConsumerProvider bufferIn, int combinedLightIn, AssemblerAnimationStatus status) {
        double centerX = molecularAssembler.getPos().getX() + 0.5f;
        double centerY = molecularAssembler.getPos().getY() + 0.5f;
        double centerZ = molecularAssembler.getPos().getZ() + 0.5f;

        // Spawn crafting FX that fly towards the block's center
        MinecraftClient minecraft = MinecraftClient.getInstance();
        if (status.getTicksUntilParticles() <= 0) {
            status.setTicksUntilParticles(4);

            if (AppEng.instance().shouldAddParticles(particleRandom)) {
                for (int x = 0; x < (int) Math.ceil(status.getSpeed() / 5.0); x++) {
                    minecraft.particleManager.addParticle(ParticleTypes.CRAFTING, centerX, centerY, centerZ, 0, 0, 0);
                }
            }
        }

        ItemStack is = status.getIs();

        ItemRenderer itemRenderer = minecraft.getItemRenderer();
        ms.push();
        ms.translate(0.5, 0.5, 0.5); // Translate to center of block

        if (!(is.getItem() instanceof BlockItem)) {
            ms.translate(0, -0.3f, 0);
        } else {
            ms.translate(0, -0.2f, 0);
        }

        itemRenderer.renderItem(is, ModelTransformation.Mode.GROUND, combinedLightIn,
                OverlayTexture.DEFAULT_UV, ms, bufferIn);
        ms.pop();
    }

    /**
     * See above for when this can be removed. It creates a RenderType that is
     * equivalent to {@link RenderLayer#getTranslucent()}, but enables alpha testing.
     * This prevents the fully transparents parts of the rendered block model from
     * occluding our particles.
     */
    private static RenderLayer createRenderType() {
        RenderPhase.Texture mipmapBlockAtlasTexture = new RenderPhase.Texture(
                SpriteAtlasTexture.BLOCK_ATLAS_TEX, false, true);
        RenderPhase.Lightmap disableLightmap = new RenderPhase.Lightmap(false);
        RenderLayer.MultiPhaseParameters glState = RenderLayer.MultiPhaseParameters.builder()
                .texture(mipmapBlockAtlasTexture)
                .transparency(RenderPhaseMixin.getTranslucentTransparency()).alpha(new RenderPhase.Alpha(0.05F))
                .lightmap(disableLightmap).build(true);

        return RenderLayer.of("ae2_translucent_alphatest", VertexFormats.POSITION_COLOR_TEXTURE_LIGHT,
                GL11.GL_QUADS, 256, glState);
    }

}