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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * 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.gravitee.node.api.healthcheck;

import java.io.Serializable;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author GraviteeSource Team
 */
public class Result implements Serializable {

  private static final Result HEALTHY = new Result(true, null);
  private static final Result NOT_READY = new Result(false, "not ready");

  private static final int PRIME = 31;

  private final boolean healthy;
  private final String message;

  public Result() {
    this.healthy = true;
    this.message = null;
  }

  protected Result(boolean isHealthy, String message) {
    this.healthy = isHealthy;
    this.message = message;
  }

  public static Result unhealthy(Throwable error) {
    return new Result(false, error.getMessage());
  }

  public static Result unhealthy(String message) {
    return new Result(false, message);
  }

  public static Result unhealthy(String message, Object... args) {
    return unhealthy(String.format(message, args));
  }

  public static Result healthy(String message, Object... args) {
    return healthy(String.format(message, args));
  }

  public static Result healthy(String message) {
    return new Result(true, message);
  }

  public static Result healthy() {
    return HEALTHY;
  }

  public boolean isHealthy() {
    return healthy;
  }

  public static Result notReady() {
    return NOT_READY;
  }

  public String getMessage() {
    return message;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    final Result result = (Result) o;
    return (
      healthy == result.healthy &&
      !(
        message != null
          ? !message.equals(result.message)
          : result.message != null
      )
    );
  }

  @Override
  public int hashCode() {
    int result = (healthy ? 1 : 0);
    result = PRIME * result + (message != null ? message.hashCode() : 0);
    return result;
  }

  @Override
  public String toString() {
    final StringBuilder builder = new StringBuilder("Result{isHealthy=");
    builder.append(healthy);
    if (message != null) {
      builder.append(", message=").append(message);
    }
    builder.append('}');
    return builder.toString();
  }
}