/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.apache.myfaces.tobago.event;
  
  
  import org.apache.myfaces.tobago.internal.util.StringUtils;
  import org.apache.myfaces.tobago.util.ComponentUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.el.ValueExpression;
  import javax.faces.component.StateHolder;
  import javax.faces.component.UIComponent;
  import javax.faces.component.UIComponentBase;
  import javax.faces.context.FacesContext;
  import javax.faces.event.ActionEvent;
  import java.lang.invoke.MethodHandles;
  
  public class ValueExpressionResetInputActionListener extends AbstractResetInputActionListener implements StateHolder {
  
    private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
    private ValueExpression clientIdsExpression;
  
    /**
     * No-arg constructor used during restoreState
     */
    public ValueExpressionResetInputActionListener() {
    }
  
    public ValueExpressionResetInputActionListener(final ValueExpression clientIdsExpression) {
      this.clientIdsExpression = clientIdsExpression;
    }
  
    @Override
    public void processAction(final ActionEvent event) {
      final Object obj = clientIdsExpression.getValue(FacesContext.getCurrentInstance().getELContext());
      final String[] clientIds;
      if (obj instanceof String[]) {
        clientIds = (String[]) obj;
      } else if (obj instanceof String) {
        clientIds= StringUtils.split((String) obj, ", ");
      } else {
        LOG.error("Ignore unknown value of " + obj + " for reset.");
        return;
      }
      for (final String clientId : clientIds) {
        final UIComponent component = ComponentUtils.findComponent(event.getComponent(), clientId);
        if (component != null) {
          resetChildren(component);
        }
      }
    }
  
    @Override
    public boolean isTransient() {
      return false;
    }
  
    @Override
    public void restoreState(final FacesContext context, final Object state) {
      final Object[] values = (Object[]) state;
      clientIdsExpression = (ValueExpression) UIComponentBase.restoreAttachedState(context, values[0]);
    }
  
    @Override
    public Object saveState(final FacesContext context) {
      final Object[] values = new Object[1];
      values[0] = UIComponentBase.saveAttachedState(context, clientIdsExpression);
      return values;
    }
  
  
    @Override
    public void setTransient(final boolean newTransientValue) {
      // ignore
    }
  
  }