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/**
 * Copyright (c) 2014 SQUARESPACE, Inc.
 *
 * 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 com.squarespace.less.model;

import static com.squarespace.less.core.LessUtils.safeEquals;

import com.squarespace.less.LessException;
import com.squarespace.less.core.Buffer;
import com.squarespace.less.exec.ExecEnv;


/**
 * Represents a property / value pair in a media feature.
 */
public class Feature implements Node {

  /**
   * Feature property node.
   */
  private final Node property;

  /**
   * Feature value node.
   */
  private final Node value;

  /**
   * Constructs a media feature with the given property and value.
   */
  public Feature(Node property, Node value) {
    this.property = property;
    this.value = value;
  }

  /**
   * Returns the property node for the feature.
   */
  public Node property() {
    return property;
  }

  /**
   * Returns the value node for the feature.
   */
  public Node value() {
    return value;
  }

  /**
   * See {@link Node#type()}
   */
  @Override
  public NodeType type() {
    return NodeType.FEATURE;
  }

  /**
   * See {@link Node#needsEval()}
   */
  @Override
  public boolean needsEval() {
    return property.needsEval() || value.needsEval();
  }

  /**
   * See {@link Node#eval(ExecEnv)}
   */
  @Override
  public Node eval(ExecEnv env) throws LessException {
    if (!needsEval()) {
      return this;
    }
    return new Feature(property.eval(env), value.eval(env));
  }

  /**
   * See {@link Node#repr(Buffer)}
   */
  @Override
  public void repr(Buffer buf) {
    property.repr(buf);
    buf.append(": ");
    value.repr(buf);
  }

  /**
   * See {@link Node#modelRepr(Buffer)}
   */
  @Override
  public void modelRepr(Buffer buf) {
    typeRepr(buf);
    posRepr(buf);
    buf.append('\n').incrIndent().indent();
    property.modelRepr(buf);
    buf.append('\n').indent();
    value.modelRepr(buf);
    buf.decrIndent();
  }

  @Override
  public boolean equals(Object obj) {
    if (obj instanceof Feature) {
      Feature other = (Feature)obj;
      return safeEquals(property, other.property) && safeEquals(value, other.value);
    }
    return false;
  }

  @Override
  public String toString() {
    return ModelUtils.toString(this);
  }

  @Override
  public int hashCode() {
    return ModelUtils.notHashable();
  }

}