/*
    * 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.validator;
  
  import org.apache.myfaces.tobago.internal.component.AbstractUIFile;
  import org.apache.myfaces.tobago.internal.util.ContentType;
  import org.apache.myfaces.tobago.util.MessageUtils;
  
  import javax.faces.application.FacesMessage;
  import javax.faces.component.StateHolder;
  import javax.faces.component.UIComponent;
  import javax.faces.context.FacesContext;
  import javax.faces.validator.Validator;
  import javax.faces.validator.ValidatorException;
  import javax.servlet.http.Part;
  import java.util.Arrays;
  
  /**
   * <p><strong>FileItemValidator</strong> is a {@link Validator} that checks
   * the FileItem in the value of the associated component.
   */
  @org.apache.myfaces.tobago.apt.annotation.Validator(id = FileItemValidator.VALIDATOR_ID)
  public class FileItemValidator implements Validator, StateHolder {
    public static final String VALIDATOR_ID = "org.apache.myfaces.tobago.FileItem";
    public static final String SIZE_LIMIT_MESSAGE_ID = "org.apache.myfaces.tobago.FileItemValidator.SIZE_LIMIT";
    public static final String CONTENT_TYPE_MESSAGE_ID = "org.apache.myfaces.tobago.FileItemValidator.CONTENT_TYPE";
    private Integer maxSize = null;
    private String[] contentType;
    private boolean transientValue;
  
    /**
     * No-arg constructor used during restoreState
     */
    public FileItemValidator() {
    }
  
    @Override
    public void validate(final FacesContext facesContext, final UIComponent component, final Object value)
        throws ValidatorException {
      if (value != null && component instanceof AbstractUIFile) {
        final Part file = (Part) value;
        if (maxSize != null && file.getSize() > maxSize) {
          throw new ValidatorException(MessageUtils.getMessage(
              facesContext, FacesMessage.SEVERITY_ERROR, SIZE_LIMIT_MESSAGE_ID, maxSize, component.getId()));
        }
        // Check only a valid file
        if (file.getSize() > 0 && contentType != null && contentType.length > 0) {
          boolean found = false;
          for (final String contentTypeStr : contentType) {
            if (ContentType.valueOf(contentTypeStr).match(ContentType.valueOf(file.getContentType()))) {
              found = true;
              break;
            }
          }
          if (!found) {
            final String message;
            if (contentType.length == 1) {
              message = contentType[0];
            } else {
              message = Arrays.toString(contentType);
            }
            throw new ValidatorException(MessageUtils.getMessage(
                facesContext, FacesMessage.SEVERITY_ERROR, CONTENT_TYPE_MESSAGE_ID, message, component.getId()));
          }
        }
      }
    }
  
    public int getMaxSize() {
      return maxSize;
    }
  
    public void setMaxSize(final int maxSize) {
      if (maxSize > 0) {
        this.maxSize = maxSize;
      }
    }
  
    public String[] getContentType() {
      return contentType;
    }
  
   public void setContentType(final String[] contentType) {
     this.contentType = contentType;
   }
 
   @Override
   public Object saveState(final FacesContext context) {
     final Object[] values = new Object[2];
     values[0] = maxSize;
     values[1] = contentType;
     return values;
   }
 
   @Override
   public void restoreState(final FacesContext context, final Object state) {
     final Object[] values = (Object[]) state;
     maxSize = (Integer) values[0];
     contentType = (String[]) values[1];
   }
 
   @Override
   public boolean isTransient() {
     return transientValue;
   }
 
   @Override
   public void setTransient(final boolean newTransientValue) {
     this.transientValue = newTransientValue;
   }
 }