package com.lexicalscope.jewel.cli;
   
   import static java.util.Arrays.asList;
   
   import java.util.List;
   
   import com.lexicalscope.fluentreflection.FluentMethod;
   import com.lexicalscope.jewel.cli.specification.OptionSpecification;
   import com.lexicalscope.jewel.cli.specification.SpecificationMultiplicity;
  
  /*
   * Copyright 2012 Tim Wood
   *
   * 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.
   */
  
  abstract class AbstractOptionSpecification implements OptionSpecification, Comparable<OptionSpecification> {
      protected final OptionAdapter annotation;
      private final List<String> defaultValue;
  
      public AbstractOptionSpecification(final OptionAdapter annotation) {
          this.annotation = annotation;
  
          if (annotation.defaultToNull() && annotation.hasDefaultValue())
          {
              throw new InvalidOptionSpecificationException("option cannot have null default and non-null default value: "
                      + annotation.method());
          }
          else if (annotation.defaultToNull())
          {
              if (annotation.isMultiValued())
              {
                  defaultValue = null;
              }
              else
              {
                  defaultValue = asList((String) null);
              }
          }
          else if (annotation.hasDefaultValue())
          {
              defaultValue = asList(annotation.defaultValue());
          }
          else
          {
              defaultValue = null;
          }
  
          if(hasExactCount() && exactly() < minimum() || exactly() > maximum())
          {
              throw new InvalidOptionSpecificationException("option has maximum and minimum and exact count which can never be satisfied: "
                      + annotation.method());
          }
          else if(minimum() > maximum())
          {
              throw new InvalidOptionSpecificationException("minimum cannot be greater than maximum: "
                      + annotation.method());
          }
          else if(maximum() < 0)
          {
              throw new InvalidOptionSpecificationException("maximum must not be less than zero: "
                      + annotation.method());
          }
      }
  
      @Override public final List<String> getDefaultValue() {
          return defaultValue;
      }
  
      @Override public final boolean hasDefaultValue() {
          return getDefaultValue() != null || annotation.defaultToNull();
      }
  
      @Override public final String getDescription() {
          return annotation.description();
      }
  
      @Override public final Class<?> getType() {
          return annotation.getValueType().classUnderReflection();
      }
  
      @Override public final boolean isMultiValued() {
          return annotation.isMultiValued();
      }
  
      @Override public final boolean isOptional() {
          return getOptionalityMethod() != null || isBoolean() || hasDefaultValue();
      }
  
     public abstract boolean isBoolean();
 
     @Override public final String getCanonicalIdentifier() {
         return getMethod().property();
     }
 
     @Override public final FluentMethod getMethod() {
         return annotation.method();
     }
 
     @Override public final FluentMethod getOptionalityMethod() {
         return annotation.correspondingOptionalityMethod();
     }
 
     @Override public final int compareTo(final OptionSpecification other) {
         return getCanonicalIdentifier().compareTo(other.getCanonicalIdentifier());
     }
 
     @Override public final boolean isHidden() {
         return annotation.isHidden();
     }
 
     @Override public boolean allowedThisManyValues(final int count) {
         if(count == 0 && !hasValue())
         {
             return true;
         }
         else if(count == 1 && hasValue() && !isMultiValued())
         {
             return true;
         }
         else if(isMultiValued() && hasExactCount())
         {
             return count == exactly();
         }
         else if(isMultiValued())
         {
             return minimum() <= count && count <= maximum();
         }
         return false;
     }
 
     @Override
    public final int maximum() {
         return annotation.maximum();
     }
 
     @Override
    public final int minimum() {
         return annotation.minimum();
     }
 
     @Override
    public final int exactly() {
         return annotation.exactly();
     }
 
     @Override
    public final boolean hasExactCount() {
         return annotation.exactly() >= 0;
     }
 
     @Override public <T> T compareCountToSpecification(
             final int valueCount,
             final SpecificationMultiplicity<T> specificationMultiplicity) {
         if(!hasValue() && valueCount > 0) {
             return specificationMultiplicity.expectedNoneGotSome();
         } else if(!isMultiValued() && hasValue() && valueCount == 0) {
             return specificationMultiplicity.expectedOneGotNone();
         } else if(!isMultiValued() && valueCount > 1) {
             return specificationMultiplicity.expectedOneGotSome();
         } else if(isMultiValued()) {
             if(hasExactCount() && valueCount != exactly()) {
                 if(valueCount < exactly()) {
                     return specificationMultiplicity.expectedExactGotTooFew(exactly(), valueCount);
                 } else {
                     return specificationMultiplicity.expectedExactGotTooMany(exactly(), valueCount);
                 }
             } else if(valueCount < minimum()) {
                 return specificationMultiplicity.expectedMinimumGotTooFew(minimum(), valueCount);
             } else if(valueCount > maximum()) {
                 return specificationMultiplicity.expectedMaximumGotTooMany(maximum(), valueCount);
             }
         }
         return specificationMultiplicity.allowed();
     }
 
     @Override public int maximumArgumentConsumption() {
         if(isMultiValued()) {
             if(hasExactCount()) {
                 return exactly();
             } else {
                 return maximum();
             }
         } else if (hasValue()) {
             return 1;
         }
         return 0;
     }
 }