# frozen_string_literal: true

module Gladys
  module TimeSeries
    class Counter
      attr_reader :values

      def initialize
        @values = Concurrent::Hash.new
      end

      def increment
        key = hash_key

        @values[key] ||= 0
        @values[key] += 1
      end

      # Get the current value for the current time in the time series.
      def current
        @values[hash_key] || 0
      end

      def any?
        @values.values.any?(&:positive?)
      end

      def between(start:, finish:)
        return @values.values if start.nil? || finish.nil?

        start = start.utc.to_i
        finish = finish.utc.to_i
        result = {}

        (start...finish).map do |time|
          result[time - start] = 0
        end

        @values.each do |key, value|
          result[key - start] += value if result[key - start]
        end

        result
      end

      private

      def hash_key
        Time.now.utc.to_i
      end
    end
  end
end