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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.cassandra.stargate.exceptions;

import org.apache.cassandra.stargate.db.ConsistencyLevel;

public class UnavailableException extends RequestExecutionException {
  public final ConsistencyLevel consistency;
  public final int required;
  public final int alive;

  public static UnavailableException create(ConsistencyLevel consistency, int required, int alive) {
    assert alive < required;
    return create(consistency, required, 0, alive, 0);
  }

  public static UnavailableException create(
      ConsistencyLevel consistency, int required, int requiredFull, int alive, int aliveFull) {
    if (required > alive) {
      return new UnavailableException(
          "Cannot achieve consistency level " + consistency, consistency, required, alive);
    }
    assert requiredFull < aliveFull;
    return new UnavailableException("Insufficient full replicas", consistency, required, alive);
  }

  public static UnavailableException create(
      ConsistencyLevel consistency,
      String dc,
      int required,
      int requiredFull,
      int alive,
      int aliveFull) {
    if (required > alive) {
      return new UnavailableException(
          "Cannot achieve consistency level " + consistency + " in DC " + dc,
          consistency,
          required,
          alive);
    }
    assert requiredFull < aliveFull;
    return new UnavailableException(
        "Insufficient full replicas in DC " + dc, consistency, required, alive);
  }

  public UnavailableException(String msg, ConsistencyLevel consistency, int required, int alive) {
    super(ExceptionCode.UNAVAILABLE, msg);
    this.consistency = consistency;
    this.required = required;
    this.alive = alive;
  }
}