package org.simantics.district.network.techtype.requests;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.simantics.databoard.Bindings;
import org.simantics.databoard.Datatypes;
import org.simantics.databoard.binding.Binding;
import org.simantics.databoard.binding.impl.ArrayListBinding;
import org.simantics.db.Resource;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.request.WriteRequest;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.util.Layer0Utils;
import org.simantics.district.network.ontology.DistrictNetworkResource;

/**
 * Change the enabled/disabled state of a single tech type table record
 */
public class EnableTechTypeItem extends WriteRequest {
	
	Resource table;
	int itemIndex;
	boolean enable;

	public EnableTechTypeItem(Resource table, int itemIndex, boolean enable) {
		super();
		this.table = table;
		this.itemIndex = itemIndex;
		this.enable = enable;
	}

	@Override
	public void perform(WriteGraph graph) throws DatabaseException {
		DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
		
		Binding binding = new ArrayListBinding(Datatypes.INTEGER_ARRAY, Bindings.INTEGER);
		List<Integer> enabled = graph.getPossibleRelatedValue2(table, DN.TechType_TechTypeTable_HasEnabledItems, binding);
		if (enabled == null)
			enabled = Collections.emptyList();
		
		if (enable) {
			if (!enabled.contains(itemIndex)) {
				enabled = new ArrayList<>(enabled);
				enabled.add((Integer) itemIndex);
				graph.getSession().markUndoPoint();
				graph.claimLiteral(table, DN.TechType_TechTypeTable_HasEnabledItems, enabled, binding);
				Layer0Utils.addCommentMetadata(graph, "Enable tech type table item " + (itemIndex + 1));
			}
		} else {
			if (enabled.contains(itemIndex)) {
				enabled = new ArrayList<>(enabled);
				enabled.remove((Integer) itemIndex);  // note - without the cast, itemIndex is list index, not element value
				graph.getSession().markUndoPoint();
				graph.claimLiteral(table, DN.TechType_TechTypeTable_HasEnabledItems, enabled, binding);
				Layer0Utils.addCommentMetadata(graph, "Disable tech type table item " + (itemIndex + 1));
			}
		}
	}

}