MetricFu.metrics_require   { "hotspots/hotspot_analyzer" }
module MetricFu
  class HotspotsGenerator < Generator
    def self.metric
      :hotspots
    end

    def initialize(options = {})
      MetricFu::Metric.enabled_metrics.each do |metric|
        require_hotspot(metric.name)
      end
      super
    end

    def emit
      # no-op
    end

    def analyze
      analyzer = MetricFu::HotspotAnalyzer.new(MetricFu.result.result_hash)
      @hotspots = analyzer.hotspots
    end

    def to_h
      result = { hotspots: {} }
      @hotspots.each do |granularity, hotspots|
        result[:hotspots][granularity.to_s] = hotspots.map(&:to_hash)
      end
      result
    end

    private

    def require_hotspot(metric_name)
      require "metric_fu/metrics/#{metric_name}/hotspot"
    rescue LoadError
      mf_debug "*** No hotspot for #{metric_name}"
    end
  end
end