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# frozen_string_literal: true
module Gitlab
module CycleAnalytics
class UsageData
PROJECTS_LIMIT = 10
attr_reader :projects, :options
def initialize
@projects = Project.sorted_by_activity.limit(PROJECTS_LIMIT)
@options = { from: 7.days.ago }
end
def to_json
total = 0
values =
medians_per_stage.each_with_object({}) do |(stage_name, medians), hsh|
calculations = stage_values(medians)
total += calculations.values.compact.sum
hsh[stage_name] = calculations
end
values[:total] = total
{ avg_cycle_analytics: values }
end
private
def medians_per_stage
projects.each_with_object({}) do |project, hsh|
::CycleAnalytics::ProjectLevel.new(project, options: options).all_medians_by_stage.each do |stage_name, median|
hsh[stage_name] ||= []
hsh[stage_name] << median
end
end
end
def stage_values(medians)
medians = medians.map(&:presence).compact
average = calc_average(medians)
{
average: average,
sd: standard_deviation(medians, average),
missing: projects.length - medians.length
}
end
def calc_average(values)
return if values.empty?
(values.sum / values.length).to_i
end
def standard_deviation(values, average)
Math.sqrt(sample_variance(values, average)).to_i
end
def sample_variance(values, average)
return 0 if values.length <= 1
sum = values.inject(0) do |acc, val|
acc + (val - average)**2
end
sum / (values.length - 1)
end
end
end
end
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