Module: Prekin

Defined in:
lib/prekin.rb,
lib/prekin/version.rb

Defined Under Namespace

Classes: Error

Constant Summary collapse

VERSION = 
'1.1.0'.freeze

Class Method Summary collapse

Class Method Details

.next(year_month_str = nil) ⇒ Object

TODO: 月および年をまたぐ場合の処理が都度都度になっており、複雑すぎる



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# File 'lib/prekin.rb', line 12

def next(year_month_str = nil) # rubocop:disable Metrics/AbcSize, Metrics/PerceivedComplexity
  base_month = if year_month_str.nil?
                 Date.today.month
               else
                 Date.parse(year_month_str).month
               end
  end_day_of_this_month = if year_month_str.nil?
                            Date.new(Date.today.year, base_month, -1)
                          else
                            Date.new(
                              Date.parse(year_month_str).year,
                              base_month,
                              -1
                            )
                          end
  days_in_month = end_day_of_this_month.day

  # 現在の月を1日ずつ増やしながら、その日が金曜日かどうかをチェックする
  dates = []
  for i in 1..days_in_month # rubocop:disable Style/For
    date = if year_month_str.nil?
             Date.new(Date.today.year, base_month, i)
           else
             Date.new(Date.parse(year_month_str).year, base_month, i)
           end

    dates << date if date.wday == 5
  end

  # 金曜日である日付を配列で得て、最終金曜日を返す (String)
  if dates.last < Date.parse(year_month_str || Date.today.to_s)
    end_day_of_next_month = if year_month_str.nil?
                              if base_month == 12
                                Date.new(Date.today.year + 1, 1, -1)
                              else
                                Date.new(Date.today.year, base_month + 1, -1)
                              end
                            elsif base_month == 12
                              Date.new(
                                Date.parse(year_month_str).year + 1,
                                1,
                                -1
                              )
                            else
                              Date.new(
                                Date.parse(year_month_str).year,
                                base_month + 1,
                                -1
                              )
                            end
    days_in_month = end_day_of_next_month.day

    dates = []
    for i in 1..days_in_month # rubocop:disable Style/For
      date = if year_month_str.nil?
               if base_month == 12 # rubocop:disable Metrics/BlockNesting
                 Date.new(Date.today.year + 1, 1, i)
               else
                 Date.new(Date.today.year, base_month + 1, i)
               end
             elsif base_month == 12
               Date.new(Date.parse(year_month_str).year + 1, 1, i)
             else
               Date.new(Date.parse(year_month_str).year, base_month + 1, i)
             end

      dates << date if date.wday == 5
    end
  end

  dates.last.to_s
end