/*
    * 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.basepom.mojo.propertyhelper.definitions;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  import static com.google.common.base.Preconditions.checkState;
  
  import org.basepom.mojo.propertyhelper.FieldContext;
  import org.basepom.mojo.propertyhelper.ValueCache;
  import org.basepom.mojo.propertyhelper.ValueProvider;
  import org.basepom.mojo.propertyhelper.fields.NumberField;
  
  import java.io.IOException;
  import java.util.Objects;
  import java.util.Optional;
  import java.util.StringJoiner;
  
  import com.google.common.annotations.VisibleForTesting;
  
  public class NumberDefinition extends FieldDefinition<String> {
  
      public static final String INITIAL_VALUE = "0";
  
      /**
       * If a multi-number, which field to increment. Field injected by Maven.
       */
      Integer fieldNumber;
  
      /**
       * Increment of the property when changing it. Field injected by Maven.
       */
      int increment = 1;
  
      public NumberDefinition() {
          initialValue = INITIAL_VALUE;
      }
  
      @VisibleForTesting
      NumberDefinition(String id) {
          super(id);
          initialValue = INITIAL_VALUE;
      }
  
  
      public Optional<Integer> getFieldNumber() {
          return Optional.ofNullable(fieldNumber);
      }
  
      public int getIncrement() {
          return increment;
      }
  
      @Override
      public void check() {
          super.check();
          checkState(getInitialValue().isPresent(), "initial value must be defined");
          getFieldNumber().ifPresent(fieldNumber -> checkState(fieldNumber >= 0, "the field number must be >= 0"));
      }
  
      @Override
      public NumberField createField(FieldContext context, ValueCache valueCache) throws IOException {
          checkNotNull(context, "context is null");
          checkNotNull(valueCache, "valueCache is null");
  
          check();
  
          final ValueProvider numberValue = valueCache.getValueProvider(this);
          return new NumberField(this, numberValue, context);
      }
  
      @Override
      public String toString() {
          return new StringJoiner(", ", NumberDefinition.class.getSimpleName() + "[", "]")
              .add("fieldNumber=" + fieldNumber)
              .add("increment=" + increment)
              .add(super.toString())
              .toString();
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
         if (!super.equals(o)) {
             return false;
         }
         NumberDefinition that = (NumberDefinition) o;
         return increment == that.increment && Objects.equals(fieldNumber, that.fieldNumber);
     }
 
     @Override
     public int hashCode() {
         return Objects.hash(super.hashCode(), fieldNumber, increment);
     }
 }