/*
 * Copyright 2020, gRPC Authors All rights reserved.
 *
 * 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.
 */

import GRPC

/// Count the number seen of each status code.
public struct StatusCounts {
  public private(set) var counts: [Int: Int64] = [:]

  public init() {}

  /// Add one to the count of this sort of status code.
  /// - parameters:
  ///     - status: The code to count.
  public mutating func add(status: GRPCStatus.Code) {
    // Only record failures
    if status != .ok {
      if let previousCount = self.counts[status.rawValue] {
        self.counts[status.rawValue] = previousCount + 1
      } else {
        self.counts[status.rawValue] = 1
      }
    }
  }

  /// Merge another set of counts into this one.
  /// - parameters:
  ///     - source: The other set of counts to merge into this.
  public mutating func merge(source: StatusCounts) {
    for sourceCount in source.counts {
      if let existingCount = self.counts[sourceCount.key] {
        self.counts[sourceCount.key] = existingCount + sourceCount.value
      } else {
        self.counts[sourceCount.key] = sourceCount.value
      }
    }
  }
}