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/*
 * Copyright 2020 Google LLC
 *
 * 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.google.firebase.remoteconfig;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.firebase.internal.NonNull;
import com.google.firebase.remoteconfig.internal.TemplateResponse.ParameterValueResponse;

import java.util.Objects;

/**
 * Represents a Remote Config parameter value that can be used in a {@link Template}.
 */
public abstract class ParameterValue {

  /**
   * Creates a new {@link ParameterValue.Explicit} instance with the given value.
   *
   * @param value The value of the {@link ParameterValue.Explicit}.
   * @return A {@link ParameterValue.Explicit} instance.
   */
  public static Explicit of(String value) {
    return new Explicit(value);
  }

  /**
   * Creates a new {@link ParameterValue.InAppDefault} instance.
   *
   * @return A {@link ParameterValue.InAppDefault} instance.
   */
  public static InAppDefault inAppDefault() {
    return new InAppDefault();
  }

  abstract ParameterValueResponse toParameterValueResponse();

  static ParameterValue fromParameterValueResponse(
          @NonNull ParameterValueResponse parameterValueResponse) {
    checkNotNull(parameterValueResponse);
    if (parameterValueResponse.isUseInAppDefault()) {
      return ParameterValue.inAppDefault();
    }
    return ParameterValue.of(parameterValueResponse.getValue());
  }

  /**
   * Represents an explicit Remote Config parameter value with a value that the
   * parameter is set to.
   */
  public static final class Explicit extends ParameterValue {

    private final String value;

    private Explicit(String value) {
      this.value = value;
    }

    /**
     * Gets the value of {@link ParameterValue.Explicit}.
     *
     * @return The value.
     */
    public String getValue() {
      return this.value;
    }

    @Override
    ParameterValueResponse toParameterValueResponse() {
      return new ParameterValueResponse()
              .setValue(this.value);
    }

    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
      Explicit explicit = (Explicit) o;
      return Objects.equals(value, explicit.value);
    }

    @Override
    public int hashCode() {
      return Objects.hash(value);
    }
  }

  /**
   * Represents an in app default parameter value.
   */
  public static final class InAppDefault extends ParameterValue {

    @Override
    ParameterValueResponse toParameterValueResponse() {
      return new ParameterValueResponse().setUseInAppDefault(true);
    }

    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
      return true;
    }
  }
}