package org.simantics.databoard.binding.impl;

import java.util.UUID;

import org.simantics.databoard.Bindings;
import org.simantics.databoard.Datatypes;
import org.simantics.databoard.binding.Binding;
import org.simantics.databoard.binding.RecordBinding;
import org.simantics.databoard.binding.error.BindingException;
import org.simantics.databoard.type.Component;
import org.simantics.databoard.type.Datatype;
import org.simantics.databoard.type.RecordType;

public class UUIDBinding extends RecordBinding {

	public static final Datatype UUIDType;
	
	public UUIDBinding() {
		componentBindings = new Binding[2];
		componentBindings[0] = Bindings.getBindingUnchecked(Long.class);
		componentBindings[1] = Bindings.getBindingUnchecked(Long.class);
		type = UUIDType;
	}

	@Override
	public Object create(Object... value) {
		return new UUID((Long)value[0], (Long)value[1]);
	}

	@Override
	public Object getComponent(Object obj, int index) {
		UUID uuid = (UUID) obj;
		switch (index) {
		case 0: return uuid.getMostSignificantBits();
		case 1: return uuid.getLeastSignificantBits();
		default: throw new IllegalArgumentException("index out of range, expected 0..3, got "+index);
		}
	}

	@Override
	public Object createPartial() throws BindingException {
		return new UUID(0, 0);
	}

	@Override
	public void setComponents(Object obj, Object... value) throws BindingException {
		throw new BindingException("Cannot change immutable UUID");
	}
	
	@Override
	public void setComponent(Object obj, int index, Object value)
			throws BindingException {
		throw new BindingException("Cannot change immutable UUID");
	}

	@Override
	public boolean isInstance(Object obj) {
		return obj instanceof UUID;
	}
	
	@Override
	public long getLong(Object r, int index) throws BindingException {
		UUID uuid = (UUID) r;
		switch (index) {
			case 0: return uuid.getMostSignificantBits();
			case 1: return uuid.getLeastSignificantBits();
			default: throw new IllegalArgumentException("index out of range, expected 0..3, got "+index);
		}
	}

	static {
		Component c1 = new Component("mostSigBits", Datatypes.LONG);
		Component c2 = new Component("leastSigBits", Datatypes.LONG);
		UUIDType = new RecordType(false, c1, c2);
	}
	
}