src/com/plusminus/craft/MinecraftLevel.java

package com.plusminus.craft;

import java.awt.Point;
import java.io.File;
import java.util.HashMap;

import com.plusminus.craft.dtf.ByteArrayTag;
import com.plusminus.craft.dtf.CompoundTag;
import com.plusminus.craft.dtf.DTFReader;
import com.plusminus.craft.dtf.DoubleTag;
import com.plusminus.craft.dtf.FloatTag;
import com.plusminus.craft.dtf.IntTag;
import com.plusminus.craft.dtf.ListTag;
import com.plusminus.craft.dtf.Tag;

/***
 * A Minecraft level 
 * @author Vincent
 */
public class MinecraftLevel {

	/**
	 * A word here about sizes, related to these two facts:
	 * 
	 *   1) Right now X-Ray only updates the minimap when it loads a chunk from disk,
	 *     and then never touches it again if no further chunks are loaded.
	 *     
	 *   2) As we "walk" around in X-Ray, the minimap is getting trimmed along the edges so
	 *      that we don't show portions of the map that we don't want to (because the
	 *      minimap now "wraps," much as our internal Chunk representation does here).
	 * 
	 * We could certainly change some of this behavior around, and in fact I'm sure that
	 * there's a much better way of dealing with the minimap than we are now.  Because I
	 * haven't gotten around to figuring that out, though, the combination of 1 and 2 means
	 * that our chunk cache has to be small enough so that chunks are always getting loaded
	 * wherever the minimap needs to be updated.
	 * 
	 * The minimap texture is 2048x2048, and there's a noticeable performance hit if we
	 * push that any higher.  Since each pixel in the minimap is a tile, a 2048-pixel
	 * row can hold 128 chunks.  Our effective size of the minimap is actually only
	 * 1024x1024, though, because of the way we trim to avoid wrapping issues, so there's
	 * really only 64 chunks in each direction that we can hold, so that's why we're using
	 * that size instead of something bigger. 
	 * 
	 * Regardless, hopefully I'll take the time to make this Better in the future.
	 */
	//public static int LEVELDATA_SIZE = 256;
	public static int LEVELDATA_SIZE = 64;
	public static int LEVELDATA_OFFSET = Integer.MAX_VALUE/2;
	public Chunk[][] levelData;
	
	private WorldInfo world;
	private Block spawnPoint;
	private Block playerPos;
	private float playerYaw;
	private float playerPitch;
	
	public Texture minecraftTexture;
	public Texture portalTexture;


	/***
	 * Create a minecraftLevel from the given world
	 * @param world
	 */
	public MinecraftLevel(WorldInfo world, Texture minecraftTexture, Texture portalTexture) {
		this.world = world;
		this.minecraftTexture = minecraftTexture;
		this.portalTexture = portalTexture;
		
		this.levelData = new Chunk[LEVELDATA_SIZE][LEVELDATA_SIZE];
		
		File levelFile = world.getLevelDatFile();
		
		CompoundTag levelData = (CompoundTag) DTFReader.readDTFFile(levelFile);
		
		//	System.out.println(levelData.toString());
		
		CompoundTag levelDataData = (CompoundTag) levelData.getTagWithName("Data");
		CompoundTag levelPlayerData = (CompoundTag) levelDataData.getTagWithName("Player");
		if(levelPlayerData != null) {
			
			// Figure out what dimension the player's in.  If it matches, move our camera there.
			// TODO: if playerDim is null, perhaps we should move the camera to the spawnpoint...
			IntTag playerDim = (IntTag) levelPlayerData.getTagWithName("Dimension");
			if (playerDim != null && ((playerDim.value == 0 && !world.isNether()) || (playerDim.value == -1 && world.isNether())))
			{
				ListTag playerPos = (ListTag) levelPlayerData .getTagWithName("Pos");
				ListTag playerRotation = (ListTag) levelPlayerData .getTagWithName("Rotation");
		
				DoubleTag posX = (DoubleTag) playerPos.value.get(0);
				DoubleTag posY = (DoubleTag) playerPos.value.get(1);
				DoubleTag posZ = (DoubleTag) playerPos.value.get(2);
				
				FloatTag rotYaw = (FloatTag) playerRotation.value.get(0);
				FloatTag rotPitch = (FloatTag) playerRotation.value.get(1);

				this.playerPos = new Block((int) -posX.value, (int) -posY.value, (int) -posZ.value);
				this.playerYaw = rotYaw.value;
				this.playerPitch = rotPitch.value;

			}
			else
			{
				this.playerPos = new Block(0,65,0);
				this.playerYaw =0;
				this.playerPitch = 0;				
			}
	
			// Set the spawn point if we're not in the Nether
			if (world.isNether())
			{
				this.spawnPoint = new Block(0,65,0);				
			}
			else
			{
				IntTag spawnX = (IntTag) levelDataData.getTagWithName("SpawnX");
				IntTag spawnY = (IntTag) levelDataData.getTagWithName("SpawnY");
				IntTag spawnZ = (IntTag) levelDataData.getTagWithName("SpawnZ");
				this.spawnPoint = new Block(-spawnX.value, -spawnY.value, -spawnZ.value);
			}
		} else {
			this.spawnPoint = new Block(0,65,0);
			this.playerPos = new Block(0,65,0);
			this.playerYaw =0;
			this.playerPitch = 0;
		}
			
		
	}
	
	/***
	 * returns the spawning point for this level
	 */
	public Block getSpawnPoint() {
		return this.spawnPoint;
	}
	
	public Block getPlayerPosition() {
		return this.playerPos;
	}
	
	public float getPlayerPitch() {
		return this.playerPitch;
	}
	
	public float getPlayerYaw() {
		return this.playerYaw;
	}
	
	/***
	 * correctly calculate the chunk X value given a universal coordinate
	 * @param x
	 * @return
	 */
	public int getChunkX(int x) {
		if(x<0) {
			return  -(((-x)-1) / 16)-1; // otherwise -1 and +1 would return the same chunk
		} else {
			return x / 16;
		}
	}
	
	/***
	 * correctly calculate the block X value given a universal coordinate
	 * @param x
	 * @return
	 */
	public int getBlockX(int x) {
		if(x<0) {
			return 15-(((-x)-1) % 16); // compensate for different chunk calculation
		} else {
			return x % 16;
		}
	}
	
	/***
	 * correctly calculate the chunk Z value given a universal coordinate
	 * @param z
	 * @return
	 */
	public int getChunkZ(int z) {
		if(z<0) {
			return  -(((-z)-1) / 16)-1; // otherwise -1 and +1 would return the same chunk
		} else {
			return z / 16;
		}
	}
	
	/***
	 * correctly calculate the block Z value given a universal coordinate
	 * @param z
	 * @return
	 */
	public int getBlockZ(int z) {
		if(z<0) {
			return 15-(((-z)-1) % 16); // compensate for different chunk calculation
		} else {
			return z % 16;
		}
	}
	
	/***
	 * Returns a single byte representing the block data at the given universal coordinates
	 * @param x
	 * @param z
	 * @param y
	 * @return
	 */
	public byte getBlockData(int x, int z, int y) {
		int chunkX = getChunkX(x);
		int chunkZ = getChunkZ(z);
		
		int blockX = getBlockX(x);
		int blockZ = getBlockZ(z);
		
		Chunk chunk = this.getChunk(chunkX, chunkZ);
		if(chunk == null) { // no chunk for the given coordinate
			return 0;
		}
		int blockOffset = y + (blockZ * 128) + (blockX * 128 * 16);
		
		try {
			return chunk.getMapData().value[blockOffset];
		} catch(Exception e) {
			// dirty, but there was an error with out of range blockvalues O_o
			System.out.println(blockOffset);
			System.out.println("" + x + ", " + y + ", " + z);
			System.out.println("" + blockX + ", " + blockZ );
			System.exit(0);
			return 0;
		}
	}
	

	public void invalidateSelected() {
		this.invalidateSelected(false);
	}

	public void invalidateSelected(boolean main_dirty) {
		for (Chunk[] chunkrow : this.levelData)
		{
			for (Chunk chunk : chunkrow)
			{
				if (chunk != null)
				{
					chunk.isSelectedDirty = true;
					if (main_dirty)
					{
						chunk.isDirty = true;
					}
				}
			}
		}
	}
	
	public void markChunkAsDirty(int x, int z) {
		Chunk c = this.getChunk(x, z);
		if (c != null)
		{
			c.isDirty = true;
		}
	}
	
	public Tag loadChunk(int x, int z) {
		File chunkFile = MineCraftEnvironment.getChunkFile(world, x,z);
		if(!chunkFile.exists()) {
			return null;
		}
		Tag t = DTFReader.readDTFFile(chunkFile);

		if (t != null)
		{
			levelData[(x+LEVELDATA_OFFSET)%LEVELDATA_SIZE][(z+LEVELDATA_OFFSET)%LEVELDATA_SIZE] = new Chunk(this, t);
		}
		
		return t;
	}
	
	/**
	 * Gets the specified Chunk object
	 *
	 * @param chunkX
	 * @param chunkZ
	 * @return
	 */
	public Chunk getChunk(int chunkX, int chunkZ) {
		return this.levelData[(chunkX+LEVELDATA_OFFSET)%LEVELDATA_SIZE][(chunkZ+LEVELDATA_OFFSET)%LEVELDATA_SIZE];
	}

	/**
	 * Sets a chunk to null
	 * 
	 * @param chunkX
	 * @param chunkZ
	 */
	public void clearChunk(int chunkX, int chunkZ)
	{
		this.levelData[(chunkX+LEVELDATA_OFFSET)%LEVELDATA_SIZE][(chunkZ+LEVELDATA_OFFSET)%LEVELDATA_SIZE] = null;
	}
	
	/***
	 * gets the data for a given chunk (coordinates are CHUNK coordinates, not world coordinates!)
	 * @param chunkX
	 * @param chunkZ
	 * @return
	 */
	public byte[] getChunkData(int chunkX, int chunkZ) {
		Chunk c = this.getChunk(chunkX, chunkZ);
		if(c == null) {
			return new byte[32768];
		} else {
			return c.getMapData().value;
		}
	}
		
	
	public Tag getFullChunk(int chunkX, int chunkZ) {
		Chunk c = this.getChunk(chunkX, chunkZ);
		if(c == null) {
			return null;
		}
		return c.getChunkData();
	}
}