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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 static java.lang.Math.max;

public enum RequestFailureReason {
  UNKNOWN(0),
  READ_TOO_MANY_TOMBSTONES(1),
  TIMEOUT(2),
  INCOMPATIBLE_SCHEMA(3);

  public final int code;

  RequestFailureReason(int code) {
    this.code = code;
  }

  private static final RequestFailureReason[] codeToReasonMap;

  static {
    RequestFailureReason[] reasons = values();

    int max = -1;
    for (RequestFailureReason r : reasons) {
      max = max(r.code, max);
    }

    RequestFailureReason[] codeMap = new RequestFailureReason[max + 1];

    for (RequestFailureReason reason : reasons) {
      if (codeMap[reason.code] != null) {
        throw new RuntimeException(
            "Two RequestFailureReason-s that map to the same code: " + reason.code);
      }
      codeMap[reason.code] = reason;
    }

    codeToReasonMap = codeMap;
  }

  public static RequestFailureReason fromCode(int code) {
    if (code < 0) {
      throw new IllegalArgumentException(
          "RequestFailureReason code must be non-negative (got " + code + ')');
    }

    // be forgiving and return UNKNOWN if we aren't aware of the code - for forward compatibility
    return code < codeToReasonMap.length ? codeToReasonMap[code] : UNKNOWN;
  }
}