/*******************************************************************************
 * Copyright (c) 2012, 2013 Original authors and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Original authors and others - initial API and implementation
 ******************************************************************************/
package org.eclipse.nebula.widgets.nattable.reorder.command;

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

import org.eclipse.nebula.widgets.nattable.command.ILayerCommand;
import org.eclipse.nebula.widgets.nattable.command.LayerCommandUtil;
import org.eclipse.nebula.widgets.nattable.coordinate.ColumnPositionCoordinate;
import org.eclipse.nebula.widgets.nattable.layer.ILayer;

public class MultiColumnReorderCommand implements ILayerCommand {

    private List<ColumnPositionCoordinate> fromColumnPositionCoordinates;
    private ColumnPositionCoordinate toColumnPositionCoordinate;
    private boolean reorderToLeftEdge;

    public MultiColumnReorderCommand(ILayer layer,
            List<Integer> fromColumnPositions, int toColumnPosition) {
        this(layer, fromColumnPositions, toColumnPosition < layer
                .getColumnCount() ? toColumnPosition : toColumnPosition - 1,
                toColumnPosition < layer.getColumnCount());
    }

    public MultiColumnReorderCommand(ILayer layer,
            List<Integer> fromColumnPositions, int toColumnPosition,
            boolean reorderToLeftEdge) {
        this.fromColumnPositionCoordinates = new ArrayList<ColumnPositionCoordinate>();
        for (Integer fromColumnPosition : fromColumnPositions) {
            this.fromColumnPositionCoordinates.add(new ColumnPositionCoordinate(
                    layer, fromColumnPosition.intValue()));
        }

        this.toColumnPositionCoordinate = new ColumnPositionCoordinate(layer,
                toColumnPosition);

        this.reorderToLeftEdge = reorderToLeftEdge;
    }

    protected MultiColumnReorderCommand(MultiColumnReorderCommand command) {
        this.fromColumnPositionCoordinates = new ArrayList<ColumnPositionCoordinate>(
                command.fromColumnPositionCoordinates);
        this.toColumnPositionCoordinate = command.toColumnPositionCoordinate;
        this.reorderToLeftEdge = command.reorderToLeftEdge;
    }

    public List<Integer> getFromColumnPositions() {
        List<Integer> fromColumnPositions = new ArrayList<Integer>();
        for (ColumnPositionCoordinate fromColumnPositionCoordinate : this.fromColumnPositionCoordinates) {
            fromColumnPositions.add(Integer
                    .valueOf(fromColumnPositionCoordinate.getColumnPosition()));
        }
        return fromColumnPositions;
    }

    public int getToColumnPosition() {
        return this.toColumnPositionCoordinate.getColumnPosition();
    }

    public boolean isReorderToLeftEdge() {
        return this.reorderToLeftEdge;
    }

    @Override
    public boolean convertToTargetLayer(ILayer targetLayer) {
        List<ColumnPositionCoordinate> convertedFromColumnPositionCoordinates = new ArrayList<ColumnPositionCoordinate>();

        for (ColumnPositionCoordinate fromColumnPositionCoordinate : this.fromColumnPositionCoordinates) {
            ColumnPositionCoordinate convertedFromColumnPositionCoordinate = LayerCommandUtil
                    .convertColumnPositionToTargetContext(
                            fromColumnPositionCoordinate, targetLayer);
            if (convertedFromColumnPositionCoordinate != null) {
                convertedFromColumnPositionCoordinates
                        .add(convertedFromColumnPositionCoordinate);
            }
        }

        ColumnPositionCoordinate targetToColumnPositionCoordinate = LayerCommandUtil
                .convertColumnPositionToTargetContext(
                        this.toColumnPositionCoordinate, targetLayer);

        if (convertedFromColumnPositionCoordinates.size() > 0
                && targetToColumnPositionCoordinate != null) {
            this.fromColumnPositionCoordinates = convertedFromColumnPositionCoordinates;
            this.toColumnPositionCoordinate = targetToColumnPositionCoordinate;
            return true;
        } else {
            return false;
        }
    }

    @Override
    public MultiColumnReorderCommand cloneCommand() {
        return new MultiColumnReorderCommand(this);
    }

}