package theishiopian.sandbox.world;

import java.util.LinkedHashSet;
import java.util.List;
import javax.annotation.Nullable;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.nbt.NBTTagList;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import net.minecraft.world.WorldSavedData;
import net.minecraftforge.common.util.Constants;

public class Tracking extends WorldSavedData
{

    private final static LinkedHashSet<BlockPos>scarecrowLocations = new LinkedHashSet<BlockPos>();
    private final static String NAME = "SCL[]";
    private static Tracking instance = null;

    public Tracking()
    {
        super(NAME);
    }

    @Nullable
    public static Tracking get(World world)
    {
        if (world.isRemote)
        {
            return null;
        }

        if (instance != null) {

            return instance;
        }

        instance = (Tracking) world.loadItemData(Tracking.class, NAME);

        if (instance == null)
        {
            instance = new Tracking();
        }

        return instance;
    }

    //clears instance
    public static void clearInstance()
    {
        instance = null;
    }

    //save scarecrow data
    public void save(World world)
    {
        world.setItemData(NAME, this);
        markDirty();
    }

    //returns read only list of scarecrows

    //adds scarecrow to list
    public static void addScarecrow(BlockPos pos)
    {
        scarecrowLocations.add(pos);
        System.out.println("Registering Scarecrow");
    }

    //removes scarecrow from list
    public static void removeScarecrow(BlockPos pos)
    {
        scarecrowLocations.remove(pos);
        System.out.println("Unregistering Scarecrow");
    }

    @Override
    public void readFromNBT(NBTTagCompound scTag)
    {
        scarecrowLocations.clear();

        final NBTTagList scarecrows = scTag.getTagList("Scarecrows", Constants.NBT.TAG_COMPOUND);

        for (int i = 0; i < scarecrows.tagCount(); i++)
        {
            final NBTTagCompound locationTag = scarecrows.getCompoundTagAt(i);

            final BlockPos location = new BlockPos(locationTag.getInteger("posX"), locationTag.getInteger("posY"), locationTag.getInteger("posZ"));

            scarecrowLocations.add(location);
        }
    }

    @Override
    public NBTTagCompound writeToNBT(NBTTagCompound scTag)
    {
        final NBTTagList locationList = new NBTTagList();

            for (BlockPos pos : scarecrowLocations)
            {
                final NBTTagCompound locationTag = new NBTTagCompound();
                locationTag.setInteger("posX", pos.getX());
                locationTag.setInteger("posY", pos.getY());
                locationTag.setInteger("posZ", pos.getZ());
                locationList.appendTag(locationTag);
            }
        scTag.setTag("Scarecrows", locationList);

        return scTag;
    }
}