/*
 * Copyright 2015 Julien Viet
 *
 * 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 io.termd.core.term;

/**
* @author <a href="mailto:julien@julienviet.com">Julien Viet</a>
*/
public class Feature<T> {

  public static <T> Feature<T> create(String name, T value) {
    Capability<T> cap = null;
    if (value instanceof Boolean) {
      cap = (Capability<T>) Capability.getCapability(name, Boolean.class);
    } else if (value instanceof Integer) {
      cap = (Capability<T>) Capability.getCapability(name, Integer.class);
    } else if (value instanceof Sequence) {
      cap = (Capability<T>) Capability.getCapability(name, Sequence.class);
    }
    if (cap == null) {
      cap = new Capability<>((Class<T>) value.getClass(), null, name, null, null);
    }
    return new Feature<>(cap, value);
  }

  final Capability<T> capability;
  final T value;

  public Feature(Capability<T> capability, T value) {
    this.capability = capability;
    this.value = value;
  }

  public Feature(String name, T value) {
    this.capability = new Capability<>((Class<T>) value.getClass(), name, name, null, null);
    this.value = value;
  }

  public T value() {
    return value;
  }

  public Capability<T> capability() {
    return capability;
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == this) {
      return true;
    }
    if (obj instanceof Feature<?>) {
      Feature<?> that = (Feature<?>) obj;
      return capability.equals(that.capability) && value.equals(that.value);
    }
    return false;
  }

  @Override
  public String toString() {
    if (value instanceof Boolean) {
      Boolean booleanValue = (Boolean) value;
      return booleanValue ? capability.name : (capability.name + "@");
    } else if (value instanceof Integer) {
      return capability.name + "#" + value;
    } else {
      return capability.name + "=" + value;
    }
  }
}