class Timetrap::Formatters::Summary
  include Timetrap::Helpers

  def initialize(entries)
    @entries = entries
  end

  def output
    by_sheet_and_tag = Hash.new

    @entries.each do |entry|
      sheet = entry[:sheet]
      tag = 'default'
      if entry.note =~ /\bt(ag)?:(\w+)\b/
        tag = $2
      end

      by_sheet_and_tag[sheet] ||= Hash.new
      sum = (by_sheet_and_tag[sheet][tag] or 0.0)
      sum += entry.duration
      by_sheet_and_tag[sheet][tag] = sum
    end

    by_sheet_and_tag.map do |sheet, tags|
      total = 0.0
      tags = tags.map do |tag, sum|
        total += sum
        sum = format_duration(sum.to_i)
        "#{tag}: #{sum}"
      end
      total = format_duration(total.to_i)
      "sheet: #{sheet}\n\t#{tags.join("\n\t")}\n\ttotal: #{total}"
    end
  end
end