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/**
 * Copyright 2009-2018 PrimeTek.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.primefaces.component.datatable.feature;

import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.logging.Logger;
import javax.el.MethodExpression;
import javax.faces.context.FacesContext;
import org.primefaces.component.datatable.DataTable;
import org.primefaces.component.datatable.DataTableRenderer;

public class DraggableRowsFeature implements DataTableFeature {

    private static final Logger LOGGER = Logger.getLogger(DraggableRowsFeature.class.getName());

    @Override
    public boolean shouldDecode(FacesContext context, DataTable table) {
        return context.getExternalContext().getRequestParameterMap().containsKey(table.getClientId(context) + "_rowreorder");
    }

    @Override
    public boolean shouldEncode(FacesContext context, DataTable table) {
        return false;
    }

    @Override
    public void decode(FacesContext context, DataTable table) {
        MethodExpression me = table.getDraggableRowsFunction();
        if (me != null) {
            me.invoke(context.getELContext(), new Object[]{table});
        }
        else {
            Map params = context.getExternalContext().getRequestParameterMap();
            String clientId = table.getClientId(context);
            int fromIndex = Integer.parseInt(params.get(clientId + "_fromIndex"));
            int toIndex = Integer.parseInt(params.get(clientId + "_toIndex"));
            table.setRowIndex(fromIndex);
            Object rowData = table.getRowData();
            Object value = table.getValue();

            if (value instanceof List) {
                List list = (List) value;

                if (toIndex >= fromIndex) {
                    Collections.rotate(list.subList(fromIndex, toIndex + 1), -1);
                }
                else {
                    Collections.rotate(list.subList(toIndex, fromIndex + 1), 1);
                }
            }
            else {
                LOGGER.info("Row reordering is only available for list backed datatables, "
                        + "use rowReorder ajax behavior with listener for manual handling of model update.");
            }
        }
    }

    @Override
    public void encode(FacesContext context, DataTableRenderer renderer, DataTable table) throws IOException {
        throw new RuntimeException("DraggableRows Feature should not encode.");
    }

}




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