require 'glimmer-dsl-swt'

class HelloComputed
  class Contact
    attr_accessor :first_name, :last_name, :year_of_birth

    def initialize(attribute_map)
      @first_name = attribute_map[:first_name]
      @last_name = attribute_map[:last_name]
      @year_of_birth = attribute_map[:year_of_birth]
    end

    def name
      "#{last_name}, #{first_name}"
    end

    def age
      Time.now.year - year_of_birth.to_i
    rescue
      0
    end
  end

  include Glimmer::UI::CustomShell

  before_body {
    @contact = Contact.new(
      first_name: 'Barry',
      last_name: 'McKibbin',
      year_of_birth: 1985
    )
  }

  body {
    shell {
      text 'Hello, Computed!'

      composite {
        grid_layout {
          num_columns 2
          make_columns_equal_width true
          horizontal_spacing 20
          vertical_spacing 10
        }

        label {text 'First &Name: '}
        text {
          text <=> [@contact, :first_name]
          layout_data {
            horizontal_alignment :fill
            grab_excess_horizontal_space true
          }
        }

        label {text '&Last Name: '}
        text {
          text <=> [@contact, :last_name]
          layout_data {
            horizontal_alignment :fill
            grab_excess_horizontal_space true
          }
        }

        label {text '&Year of Birth: '}
        text {
          text <=> [@contact, :year_of_birth]
          layout_data {
            horizontal_alignment :fill
            grab_excess_horizontal_space true
          }
        }

        label {text 'Name: '}
        label {
          text <= [@contact, :name, computed_by: [:first_name, :last_name]]
          layout_data {
            horizontal_alignment :fill
            grab_excess_horizontal_space true
          }
        }

        label {text 'Age: '}
        label {
          text <= [@contact, :age, on_write: :to_i, computed_by: [:year_of_birth]]
          layout_data {
            horizontal_alignment :fill
            grab_excess_horizontal_space true
          }
        }
      }
    }
  }
end

HelloComputed.launch