date_range.rb

class DateRange
  attr_accessor :range, :format, :custom_start_date, :custom_end_date
  def initialize(range, options = {})
    @range             = range ? range.to_s : options[:default].to_s
    @format            = options[:format]
    @custom_start_date = options[:start_date].to_formatted_date(@format) if options[:start_date]
    @custom_end_date   = options[:end_date].to_formatted_date(@format) if options[:end_date]
  end
  
  def to_a
    [start_date, end_date]
  end
  
  def to_r
    start_date..end_date
  end
  
  def cover? d
    to_r.cover? d
  end
  
  def self.from_params params, format = nil
    new params[:range] || params[:date_range], 
      start_date: params[:start_date], 
      end_date: params[:end_date], 
      format: format
  end
  
  def to_params merge_with = {}
    if @range == "your_dates"
      h = {range: :your_dates, start_date: start_date, end_date: end_date}
    else
      h = {range: @range}
    end
    merge_with.merge h
  end
  
  def blank?
    @range.blank?
  end

  def all?
    @range == 'all_dates'
  end
  
  def start_date=(other)
    @custom_start_date = other
  end

  def end_date=(other)
    @custom_end_date = other
  end

  def start_date_s
    self.start_date.is_a?(Date) ? self.start_date.to_s(:db) : self.start_date
  end

  def end_date_s
    self.end_date.is_a?(Date)  ? self.end_date.to_s(:db)    : self.end_date
  end

  def start_date
    case @range
    when '30_days'
      Date.today - 30
    when '60_days'
      Date.today - 60
    when '90_days'
      Date.today - 90
    when '120_days'
      Date.today - 120
    when 'last_year'
      Date.today.advance(:years => -1).beginning_of_year
    when 'last_quarter'
      (Date.today.beginning_of_quarter - 1.day).beginning_of_quarter
    when 'last_month'
      Date.today.last_month.beginning_of_month
    when 'this_year', 'ytd'
      Date.today.beginning_of_year
    when 'this_quarter'
      Date.today.beginning_of_quarter
    when 'this_month'
      Date.today.beginning_of_month
    when 'your_dates'
      @custom_start_date
    when 'all_dates'
      100.years.ago.to_date.beginning_of_year
    else
      Date.today.beginning_of_month
    end
  end
  
  def start
    start_date
  end

  def end_date
    case @range
    when 'last_month'
      Date.today.beginning_of_month - 1.day
    when 'last_year'
      Date.today.beginning_of_month.beginning_of_year - 1.day
    when 'last_quarter'
      Date.today.beginning_of_quarter - 1.day
    when "this_month"
      Date.today.end_of_month
    when "this_year"
      Date.today.end_of_year
    when "this_quarter"
      Date.today.end_of_quarter
    when 'ytd'
      Date.today + 1
    when 'your_dates'
      @custom_end_date
    else
      Date.today + 1
    end
  end
  
  def end
    end_date
  end
  
  private
  
end