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package kekztech;

import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.UUID;

import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.World;

public class ConduitNetworkController implements Comparable<ConduitNetworkController> {
	
	private static final HashSet<ConduitNetworkController> instances = new HashSet<>();
	
	private final UUID uuid = UUID.randomUUID();
	private final LinkedList<IConduit> conduits = new LinkedList<>();
	private final HashMap<String, IConduit> sources = new HashMap<>(); // k = resource name, v = source conduit
	
	public ConduitNetworkController() {
		
	}
	
	/**
	 * Places a new conduit as it's own network. Merges with adjacent networks automatically.
	 *  
	 * @param conduit
	 * 			The conduit to be placed
	 */
	public static void placeConduit(IConduit conduit) {
		
		conduit.setNetwork(new ConduitNetworkController());
		conduit.getNetwork().addConduit(conduit);
		
		final TileEntity te = (TileEntity) conduit;
		final int x = te.xCoord;
		final int y = te.yCoord;
		final int z = te.zCoord;
		
		// Search for adjacent Networks on all six sides
		final HashSet<ConduitNetworkController> networks = new HashSet<>();
		final World world = te.getWorldObj();
		final TileEntity te1x = world.getTileEntity(x + 1, y, z);
		final TileEntity te0x = world.getTileEntity(x - 1, y, z);
		final TileEntity te1y = world.getTileEntity(x, y + 1, z);
		final TileEntity te0y = world.getTileEntity(x, y - 1, z);
		final TileEntity te1z = world.getTileEntity(x, y, z + 1);
		final TileEntity te0z = world.getTileEntity(x, y, z - 1);
		if(te1x != null && te1x instanceof IConduit) {
			final IConduit c = (IConduit) te1x;
			networks.add(c.getNetwork());
		}
		if(te0x != null && te0x instanceof IConduit) {
			final IConduit c = (IConduit) te0x;
			networks.add(c.getNetwork());
		}
		if(te1y != null && te1y instanceof IConduit) {
			final IConduit c = (IConduit) te1y;
			networks.add(c.getNetwork());
		}
		if(te0y != null && te0y instanceof IConduit) {
			final IConduit c = (IConduit) te0y;
			networks.add(c.getNetwork());
		}
		if(te1z != null && te1z instanceof IConduit) {
			final IConduit c = (IConduit) te1z;
			networks.add(c.getNetwork());
		}
		if(te0z != null && te0z instanceof IConduit) {
			final IConduit c = (IConduit) te0z;
			networks.add(c.getNetwork());
		}
		// Return prematurely if no adjacent network was found
		if(networks.size() == 0) {
			return;
		}
		// Sort networks by descending size
		final LinkedList<ConduitNetworkController> networkList = new LinkedList<>();
		networkList.addAll(networks);
		Collections.sort(networkList, Collections.reverseOrder());
		// Larger networks consume smaller networks to reduce copying around data
		while(networkList.size() > 1) {
			final ConduitNetworkController l = networkList.get(networkList.size() - 2);
			final ConduitNetworkController r = networkList.getLast();
			l.appendNetwork(r);
			networkList.removeLast();
		}
		
	}
	
	/**
	 * Deletes this conduit and breaks up adjacent networks into separate networks.
	 * 
	 * @param conduit
	 * 			Conduit to be removed.
	 */
	public static void destroyConduit(IConduit conduit) {
		
	}
	
	public void run() {
		
	}
	
	@Override
	public boolean equals(Object o) {
		if(o instanceof ConduitNetworkController) {
			final ConduitNetworkController network = (ConduitNetworkController) o;
			return uuid.equals(network.getUUID());
		} else {
			return false;
		}
	}
	
	@Override
	public int compareTo(ConduitNetworkController o) {
		return (int) Math.signum(o.getSize() - this.getSize());
	}
	
	public UUID getUUID() {
		return uuid;
	}
	
	public int getSize() {
		return conduits.size();
	}
	
	/**
	 * Register a new conduit to this network.
	 * 
	 * @param conduit
	 * 			New conduit.
	 */
	private void addConduit(IConduit conduit) {
		conduits.add(conduit);
	}
	
	/**
	 * Merge another network with this one if they have been connected by a new conduit.
	 * 
	 * @param network
	 * 			Network to merge with this one.
	 */
	private void appendNetwork(ConduitNetworkController network) {
		
	}
	
	private void updateSource() {
		
	}

}