require 'yaml'
require 'json'

module Knapsack
  class Presenter
    class << self
      def report_yml
        Knapsack.tracker.test_files_with_time.to_yaml
      end

      def report_json
        JSON.pretty_generate(Knapsack.tracker.test_files_with_time)
      end

      def report_details
        "Knapsack report was generated. Preview:\n" + Presenter.report_json
      end

      def global_time
        global_time = pretty_seconds(Knapsack.tracker.global_time)
        "\nKnapsack global time execution for tests: #{global_time}"
      end

      def time_offset
        "Time offset: #{Knapsack.tracker.config[:time_offset_in_seconds]}s"
      end

      def max_allowed_node_time_execution
        max_node_time_execution = pretty_seconds(Knapsack.tracker.max_node_time_execution)
        "Max allowed node time execution: #{max_node_time_execution}"
      end

      def exceeded_time
        exceeded_time = pretty_seconds(Knapsack.tracker.exceeded_time)
        "Exceeded time: #{exceeded_time}"
      end

      def time_offset_warning
        str = %{\n========= Knapsack Time Offset Warning ==========
#{Presenter.time_offset}
#{Presenter.max_allowed_node_time_execution}
#{Presenter.exceeded_time}
        }
        if Knapsack.tracker.time_exceeded?
          str << %{
Tests on this CI node took more than max allowed node time execution.
Please regenerate your knapsack report.
If that didn't help then split your heavy test file
or bump time_offset_in_seconds setting.}
        else
          str << %{
Global time execution for this CI node is fine.
Happy testing!}
        end
        str << "\n\nNeed explanation? See FAQ:"
        str << "\nhttps://github.com/ArturT/knapsack#faq"
        str << "\n=================================================\n"
        str << %{Sign up for beta Knapsack Pro here:
http://knapsackpro.com}
        str << "\n=================================================\n"
        str
      end

      def pretty_seconds(seconds)
        sign = ''

        if seconds < 0
          seconds = seconds*-1
          sign = '-'
        end

        return "#{sign}#{seconds}s" if seconds.abs < 1

        time = Time.at(seconds).gmtime.strftime('%Hh %Mm %Ss')
        time_without_zeros = time.gsub(/00(h|m|s)/, '').strip
        sign + time_without_zeros
      end
    end
  end
end