date_picker_module

require 'green_shoes'

module DatePicker

  def set_no_days
      @no_of_days = case @month
        when 4 then 1..30
        when 6 then 1..30
        when 9 then 1..30
        when 11 then 1..30
        when 2 then 1..28
        else 1..31
      end
  end

  def draw_days (no_of_days)
    no_of_days.each do |day|
      stack width: 30, height: 30 do
        border black
        button day.to_s, width: 30, height: 30 do
          @selected_date = day.to_s + "." + "#{@month}" + "." + "#{@year}"
          alert @selected_date
        end
      end
    end
  end

  def picker
    window title: "Date picker", margin: 35, width: 300, height: 400 do
      set_no_days
      background antiquewhite
      @month = Time.now.month
      @year = Time.now.year
      @day = Time.now.day
      @today = "#{@day}.#{@month}.#{@year}"

      @year_slot = stack margin_bottom: 5 do
        para "Year: #{@year}", :align => "center"
      end

      @month_slot = stack margin_bottom: 5 do
        para "Month: #{@month}", :align => "center"
      end

      @today_slot = flow do
        button "#{@today}", margin_bottom: 15 do
          @selected_date = @today
          alert @selected_date
        end
      end

      @year_buttons_slot = flow margin_bottom: 5 do
        para "Change year"

        button "<=" do
          @year = @year - 1
          @year_slot.clear
          @year_slot.append {para "Year: #{@year}", :align => "center"}
          @month_slot.clear
          @month = 1
          @month_slot.append {para "Month: #{@month}", :align => "center"}
        end

        button "=>" do
          @year = @year + 1
          @year_slot.clear
          @year_slot.append {para "Year: #{@year}", :align => "center"}
          @month_slot.clear
          @month = 1
          @month_slot.append {para "Month: #{@month}", :align => "center"}
        end
      end

      @month_buttons_slot = flow margin_bottom: 5 do
        para "Change month"

        button "<=" do
          @month = @month - 1 unless @month == 1
          set_no_days
          @month_slot.clear
          @month_slot.append {para "Month: #{@month}", :align => "center"}
          @days_slot.clear
          @days_slot.append {draw_days(@no_of_days)}
        end

        button "=>" do
          @month = @month + 1 unless @month == 12
          set_no_days
          @month_slot.clear
          @month_slot.append {para "Month: #{@month}", :align => "center"}
          @days_slot.clear
          @days_slot.append {draw_days(@no_of_days)}
        end
      end

      @days_slot = flow do
        draw_days(@no_of_days)
      end
    end
  end
end

include DatePicker

Shoes.app height: 700, width: 600 do

  button "Select date" do
    picker
  end
end