lib/timely/date_chooser.rb
# frozen_string_literal: true
module Timely
class DateChooser
# Where is this used... so far only in one place, _date_range.html.haml
# May be good to refactor this as well, after the class behaviour is refactored.
INTERVALS = [
{ code: 'week', name: 'week(s)', description: 'Weekdays selected will be chosen every {{n}} weeks for the date range' },
{ code: 'week_of_month', name: 'week of month', description: 'Weekdays selected will be chosen in their {{ord}} occurance every month,
e.g. if wednesday and thursday are selected, the first wednesday and
first thursday are selected. Note: this may mean the booking is copied
to Thursday 1st and Wednesday 7th' }
].freeze
attr_accessor :multiple_dates, :from, :to, :select, :dates, :interval, :weekdays
def initialize(options)
@multiple_dates = options[:multiple_dates] || false
@from = process_date(options[:from])
@to = process_date(options[:to])
@select = options[:select]
@dates = options[:dates]
@specific_dates = options[:specific_dates]
@interval = options[:interval]
@weekdays = WeekDays.new(options[:weekdays]) if @select == 'weekdays'
validate
end
def process_date(date)
case date
when Date then date
when NilClass then nil
when String
date !~ /[^[:space:]]/ ? nil : date.to_date
end
end
# Chooses a set of dates from a date range, based on conditions.
# date_info - A hash with conditions and date information
# :from - The start of the date range
# :to - The end of the date range
#
# You can either specify specific dates to be chosen each month:
# :dates - A comma separated string of days of the month, e.g. 1,16
# :specific_dates - A comma separated string of dates, e.g. 26-10-2012, 03-11-2012, 01-01-2013
#
# or you can specify how to select the dates
# :day - A hash of days, the index being the wday, e.g. 0 = sunday, and the value being 1 if chosen
# :interval - A hash of information about the interval
# :level - The level/multiplier of the interval unit
# :unit - The unit of the interval, e.g. w for week, mow for month of week
# e.g. :level => 2, :unit => w would try to select the days of the week every fortnight,
# so every friday and saturday each fornight
def choose_dates
# Not multiple dates - just return the From date.
return [@from] unless @multiple_dates
# Multiple dates - return the array, adjusted as per input
all_days = (@from..@to).to_a
case @select
when 'days'
days = @dates.gsub(/\s/, '').split(',')
all_days.select { |date| days.include?(date.mday.to_s) }
when 'specific_days'
days = @specific_dates.gsub(/\s/, '').split(',')
days.map(&:to_date)
when 'weekdays'
raise DateChooserException, 'No days of the week selected' if @weekdays.weekdays.empty?
raise DateChooserException, 'No weekly interval selected' if @interval&.empty?
all_days.select do |date|
next unless @weekdays.has_day?(date.wday)
case @interval[:unit]
when 'week'
# 0 = first week, 1 = second week, 2 = third week, etc.
nth_week = (date - @from).to_i / 7
# true every 2nd week (0, 2, 4, 6, etc.)
(nth_week % @interval[:level].to_i).zero?
when 'week_of_month'
week = @interval[:level].to_i
(date.mday > (week - 1) * 7 && date.mday <= week * 7)
end
end
else
all_days
end
end
private
def validate
raise DateChooserException, 'A Start Date is required' unless @from
raise DateChooserException, 'Start Date is after End Date' if @multiple_dates && @to && @from > @to
@to ||= @from if @multiple_dates
end
end
class DateChooserException < RuntimeError; end
end