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/*
 * Copyright 2018 Red Hat Inc. and/or its affiliates and other contributors
 * as indicated by the @authors tag. All rights reserved.
 * See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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.hyperfoil.api.config;

import java.util.ArrayList;
import java.util.Objects;

import io.hyperfoil.function.SerializableSupplier;
import io.hyperfoil.impl.FutureSupplier;

/**
 * @author Ståle Pedersen
 */
public class SequenceBuilder extends BaseSequenceBuilder {
   private final ScenarioBuilder scenario;
   private final String name;
   private int id;
   private Sequence sequence;
   // Next sequence as set by parser. It's not possible to add this as nextSequence step
   // since that would break anchors - we can insert it only after parsing is complete.
   private String nextSequence;

   SequenceBuilder(ScenarioBuilder scenario, String name) {
      super(null);
      this.scenario = scenario;
      this.name = Objects.requireNonNull(name);
   }

   SequenceBuilder(ScenarioBuilder scenario, SequenceBuilder other) {
      super(null);
      this.scenario = scenario;
      this.name = other.name;
      readFrom(other);
      this.nextSequence = other.nextSequence;
   }

   public void prepareBuild() {
      // capture local var to prevent SequenceBuilder serialization
      String nextSequence = this.nextSequence;
      if (nextSequence != null) {
         step(s -> {
            s.nextSequence(nextSequence);
            return true;
         });
      }
      // We need to make a defensive copy as prepareBuild() may trigger modifications
      new ArrayList<>(steps).forEach(StepBuilder::prepareBuild);
   }

   public Sequence build(SerializableSupplier phase) {
      if (sequence != null) {
         return sequence;
      }
      FutureSupplier ss = new FutureSupplier<>();
      sequence = new SequenceImpl(phase, this.name, id, buildSteps().toArray(new Step[0]));
      ss.set(sequence);
      return sequence;
   }

   void id(int id) {
      this.id = id;
   }

   @Override
   public SequenceBuilder end() {
      return this;
   }

   public ScenarioBuilder endSequence() {
      return scenario;
   }

   public String name() {
      return name;
   }

   public void nextSequence(String nextSequence) {
      this.nextSequence = nextSequence;
   }
}