package com.blarg.gdx.tilemap3d;

import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Mesh;
import com.badlogic.gdx.graphics.g3d.Renderable;
import com.badlogic.gdx.graphics.g3d.RenderableProvider;
import com.badlogic.gdx.graphics.g3d.attributes.BlendingAttribute;
import com.badlogic.gdx.graphics.g3d.attributes.FloatAttribute;
import com.badlogic.gdx.graphics.g3d.Material;
import com.badlogic.gdx.graphics.g3d.attributes.TextureAttribute;
import com.badlogic.gdx.math.Vector3;
import com.badlogic.gdx.math.collision.BoundingBox;
import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.Disposable;
import com.badlogic.gdx.utils.Pool;

public class TileChunk extends TileContainer implements TileRawDataContainer, RenderableProvider, Disposable {
	final int x;
	final int y;
	final int z;
	final int width;
	final int height;
	final int depth;

	final Tile[] data;
	final BoundingBox bounds;
	final BoundingBox tmpBounds = new BoundingBox();
	final Vector3 position;
	final Vector3 tmpPosition = new Vector3();

	Mesh opaqueMesh;
	Mesh alphaMesh;
	final Material opaqueMaterial = new Material();
	final Material alphaMaterial = new Material();
	final BoundingBox meshBounds = new BoundingBox();

	public final TileMap tileMap;

	@Override
	public Tile[] getData() {
		return data;
	}

	@Override
	public int getWidth() {
		return width;
	}

	@Override
	public int getHeight() {
		return height;
	}

	@Override
	public int getDepth() {
		return depth;
	}

	@Override
	public int getMinX() {
		return x;
	}

	@Override
	public int getMinY() {
		return y;
	}

	@Override
	public int getMinZ() {
		return z;
	}

	@Override
	public int getMaxX() {
		return x + width - 1;
	}

	@Override
	public int getMaxY() {
		return y + height - 1;
	}

	@Override
	public int getMaxZ() {
		return z + depth - 1;
	}

	@Override
	public Vector3 getPosition() {
		tmpPosition.set(position);
		return tmpPosition;
	}

	@Override
	public BoundingBox getBounds() {
		tmpBounds.set(bounds);
		return tmpBounds;
	}

	public BoundingBox getMeshBounds() {
		tmpBounds.set(meshBounds);
		return tmpBounds;
	}

	public int getNumVertices() {
		return opaqueMesh != null ? opaqueMesh.getNumVertices() : 0;
	}

	public int getNumAlphaVertices() {
		return alphaMesh != null ? alphaMesh.getNumVertices() : 0;
	}

	public TileChunk(int x, int y, int z, int width, int height, int depth, TileMap tileMap) {
		if (tileMap == null)
			throw new IllegalArgumentException();

		this.tileMap = tileMap;
		this.x = x;
		this.y = y;
		this.z = z;
		this.width = width;
		this.height = height;
		this.depth = depth;
		this.position = new Vector3(x, y, z);
		bounds = new BoundingBox();
		bounds.min.set(x, y, z);
		bounds.max.set(x + width, y + height, z + depth);

		int numTiles = width * height * depth;
		data = new Tile[numTiles];
		for (int i = 0; i < numTiles; ++i)
			data[i] = new Tile();

		opaqueMesh = null;
		alphaMesh = null;
		opaqueMaterial.set(TextureAttribute.createDiffuse(tileMap.tileMeshes.atlas.texture));
		alphaMaterial.set(TextureAttribute.createDiffuse(tileMap.tileMeshes.atlas.texture));
		alphaMaterial.set(new BlendingAttribute());
		alphaMaterial.set(FloatAttribute.createAlphaTest(0.0f));
	}

	public void updateVertices(ChunkVertexGenerator generator) {
		ChunkVertexGenerator.GeneratedChunkMeshes generatedMeshes = generator.generate(this);

		meshBounds.clr();

		if (generatedMeshes.opaqueMesh.getNumVertices() > 0) {
			opaqueMesh = generatedMeshes.opaqueMesh;
			opaqueMesh.calculateBoundingBox(tmpBounds);
			meshBounds.ext(tmpBounds);
		} else
			opaqueMesh = null;

		if (generatedMeshes.alphaMesh.getNumVertices() > 0) {
			alphaMesh = generatedMeshes.alphaMesh;
			alphaMesh.calculateBoundingBox(tmpBounds);
			meshBounds.ext(tmpBounds);
		} else
			alphaMesh = null;
	}

	public Tile getWithinSelfOrNeighbour(int x, int y, int z) {
		int checkX = x + this.x;
		int checkY = y + this.y;
		int checkZ = z + this.z;
		return tileMap.get(checkX, checkY, checkZ);
	}

	public Tile getWithinSelfOrNeighbourSafe(int x, int y, int z) {
		int checkX = x + this.x;
		int checkY = y + this.y;
		int checkZ = z + this.z;
		if (!tileMap.isWithinBounds(checkX, checkY, checkZ))
			return null;
		else
			return tileMap.get(checkX, checkY, checkZ);
	}

	@Override
	public Tile get(int x, int y, int z) {
		int index = getIndexOf(x, y, z);
		return data[index];
	}

	@Override
	public Tile getSafe(int x, int y, int z) {
		if (!isWithinLocalBounds(x, y, z))
			return null;
		else
			return get(x, y, z);
	}

	private int getIndexOf(int x, int y, int z) {
		return (y * width * depth) + (z * width) + x;
	}

	@Override
	public void getRenderables(Array<Renderable> renderables, Pool<Renderable> pool) {
		if (opaqueMesh != null)
			renderables.add(getRenderableFor(pool, opaqueMesh, opaqueMaterial, null));
		if (alphaMesh != null)
			renderables.add(getRenderableFor(pool, alphaMesh, alphaMaterial, null));
	}

	private Renderable getRenderableFor(Pool<Renderable> pool, Mesh mesh, Material material, Object userData) {
		Renderable renderable = pool.obtain();
		renderable.mesh = mesh;
		renderable.meshPartOffset = 0;
		renderable.meshPartSize = mesh.getNumVertices();
		renderable.primitiveType = GL20.GL_TRIANGLES;
		renderable.bones = null;
		renderable.environment = null;
		renderable.shader = null;
		renderable.userData = userData;
		renderable.material = material;
		return renderable;
	}

	@Override
	public void dispose() {
		if (opaqueMesh != null)
			opaqueMesh.dispose();
		if (alphaMesh != null)
			alphaMesh.dispose();
	}

	@Override
	public boolean equals(Object o) {
		if (this == o)
			return true;
		if (o == null || getClass() != o.getClass())
			return false;

		TileChunk tileChunk = (TileChunk)o;

		if (x != tileChunk.x)
			return false;
		if (y != tileChunk.y)
			return false;
		if (z != tileChunk.z)
			return false;
		if (tileMap != null ? !tileMap.equals(tileChunk.tileMap) : tileChunk.tileMap != null)
			return false;

		return true;
	}

	@Override
	public int hashCode() {
		int result = x;
		result = 31 * result + y;
		result = 31 * result + z;
		result = 31 * result + (tileMap != null ? tileMap.hashCode() : 0);
		return result;
	}
}