/*
    * Copyright 2020-2022 Foreseeti AB <https://foreseeti.com>
    *
    * 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.mal_lang.langspec;
  
  import static java.util.Objects.requireNonNull;
  
  import jakarta.json.Json;
  import jakarta.json.JsonObject;
  import java.util.ArrayList;
  import java.util.List;
  import org.mal_lang.langspec.builders.StepsBuilder;
  import org.mal_lang.langspec.step.StepExpression;
  
  /**
   * Immutable class representing steps of an attack step in a MAL language.
   *
   * @since 1.0.0
   */
  public final class Steps {
    private final boolean overrides;
    private final List<StepExpression> stepExpressions = new ArrayList<>();
  
    private Steps(boolean overrides) {
      this.overrides = overrides;
    }
  
    /**
     * Returns whether this {@code Steps} object overrides.
     *
     * @return whether this {@code Steps} object overrides
     * @since 1.0.0
     */
    public boolean overrides() {
      return this.overrides;
    }
  
    /**
     * Returns a list of all step expressions in this {@code Steps} object.
     *
     * @return a list of all step expressions in this {@code Steps} object
     * @since 1.0.0
     */
    public List<StepExpression> getStepExpressions() {
      return List.copyOf(this.stepExpressions);
    }
  
    void addStepExpression(StepExpression stepExpression) {
      this.stepExpressions.add(requireNonNull(stepExpression));
    }
  
    JsonObject toJson() {
      var jsonStepExpressions = Json.createArrayBuilder();
      for (var stepExpression : this.stepExpressions) {
        jsonStepExpressions.add(stepExpression.toJson());
      }
      return Json.createObjectBuilder()
          .add("overrides", this.overrides)
          .add("stepExpressions", jsonStepExpressions)
          .build();
    }
  
    static Steps fromBuilder(StepsBuilder builder) {
      requireNonNull(builder);
      return new Steps(builder.overrides());
    }
  }