module StatsHelper

  def chart_tag(opt = {})
    opt[:data] ||= {}
    opt[:data][:graph] = admin_api_stats_path(chart_data(opt))
    content_tag :div, "", opt
  end

  def chart_data(opt = {})
    data = nil
    if opt[:id].present?
      data = { opt[:id] => true }
    elsif opt[:event].present?
      data = { event: opt[:event] }
    end
    data
  end

  def graph_link_text(event)
    text = t("admin.stats.graph.#{event}")
    if text.to_s.match(/translation missing/)
      text = event
    end
    text
  end

  def budget_investments_chart_tag(opt = {})
    events = events.join(",") if events.is_a? Array
    opt[:data] ||= {}
    opt[:data][:graph] = admin_api_stats_path(budget_investments: true)
    content_tag :div, "", opt
  end

  def calculate_percentage(fraction, total)
    percent = fraction / total.to_f
    percent.nan? ? 0.0 : (percent * 100).round(3)
  end
end