/**
    * Copyright 2005-2014 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.kew.impl.document.search;
  
  import com.google.common.base.Function;
  import com.google.common.base.Predicate;
  import com.google.common.collect.Iterables;
  import com.google.common.collect.Lists;
  import org.apache.commons.collections.CollectionUtils;
  import org.apache.commons.lang.ArrayUtils;
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.CoreApiServiceLocator;
  import org.kuali.rice.kns.lookup.LookupableHelperService;
  import org.kuali.rice.kns.web.ui.Field;
  import org.kuali.rice.kns.web.ui.Row;
  import org.kuali.rice.krad.util.KRADConstants;
  
  import javax.annotation.Nullable;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   *
   */
  class FormFields {
      private final Collection<Row> rows;
  
      FormFields(Collection<Row> rows) {
          this.rows = rows;
      }
  
      /**
       * Preserves Field values, saving single or array property value depending on field type; single property value is
       * converted into String[1]
       * This implementation makes the assumption that a Field can either represent a single property value, or an array
       * of values but not both! (only one is preserved)
       * @return a Map<String, String[]> containing field values depending on field type
       */
      Map<String, String[]> getFieldValues() {
          Map<String, String[]> values = new HashMap<String, String[]>();
          for (Field field : getFields()) {
              String[] value;
              if(!Field.MULTI_VALUE_FIELD_TYPES.contains(field.getFieldType())) {
                  value = new String[] { field.getPropertyValue() };
              } else {
                  //multi value, set to values
                  value = field.getPropertyValues();
              }
              values.put(field.getPropertyName(), value);
          }
          return values;
      }
      
      Field getField(final String name) {
          return Iterables.tryFind(getFields(), new Predicate<Field>() {
              public boolean apply(@Nullable Field input) {
                  return StringUtils.equals(name, input.getPropertyName());
              }
          }).orNull();
      }
  
      void setFieldValue(String name, String value) {
          setFieldValue(name, new String[]{value});
      }
  
      void setFieldValue(String name, String[] value) {
          setFieldValues(Collections.singletonMap(name, value));
      }
  
      /**
       * Overrides Row Field values with Map values
       * @param values the fieldvalues
       */
      void setFieldValues(Map<String, String[]> values) {
          for (Field field: getFields()) {
              if (StringUtils.isNotBlank(field.getPropertyName())) {
                  String[] value = values.get(field.getPropertyName());
                  if (ArrayUtils.isNotEmpty(value)) {
                      setFieldValue(field, value);
                  }
              }
          }
      }
 
     void applyFieldAuthorizations(LookupableHelperService lhs) {
         for (Field f: getFields()) {
             lhs.applyFieldAuthorizationsFromNestedLookups(f);
         }
     }
 
     List<Field> getFieldList() {
         return Lists.newArrayList(getFields());
     }
 
     /**
      * Sets a Field value appropriately, depending on whether it is a "multi-value" field type
      */
     void setFieldValue(Field field, String[] values) {
         if(!Field.MULTI_VALUE_FIELD_TYPES.contains(field.getFieldType())) {
             field.setPropertyValue(CollectionUtils.get(values, 0));
         } else {
             //multi value, set to values
             field.setPropertyValues(values);
         }
     }
 
     Iterable<Field> getFields() {
         return Iterables.concat(Iterables.transform(this.rows, new Function<Row, Iterable<Field>>() {
             @Override
             public Iterable<Field> apply(@Nullable Row row) {
                 return row.getFields();
             }
         }));
     }
 }