module Vedeu

  module DSL

    # Borders are defined by name for each of the client application's
    # interfaces or views. They can be enabled or disabled (which controls
    # whether they are rendered or not), they have their own colours and styles,
    # and each aspect of the border can be controlled.
    #
    # @example
    #   # Borders can be defined when defining your interface...
    #   Vedeu.interface 'my_interface' do
    #     border do
    #     # ...
    #   end
    #
    #   # ...or as part of a view definition...
    #   Vedeu.renders do
    #     view 'border_demo' do
    #       border do
    #       # ...
    #     end
    #
    #   # ...or standalone; referencing the target interface or view.
    #   Vedeu.border 'some_interface' do
    #     # ...
    #   end
    #
    class Border

      include Vedeu::DSL
      include Vedeu::DSL::Presentation
      include Vedeu::DSL::Use

      # Specify the border of an interface or view with a simple DSL.
      #
      #   Vedeu.border 'some_interface' do
      #     # ...
      #   end
      #
      # @param name [String] The name of the interface or view to which this
      #   border belongs.
      # @param block [Proc]
      # @raise [Vedeu::InvalidSyntax] The required block was not given.
      # @return [Vedeu::Border]
      def self.border(name, &block)
        fail Vedeu::InvalidSyntax, 'block not given' unless block_given?

        Vedeu::Border.build({ enabled: true, name: name }, &block).store
      end

      # Returns an instance of DSL::Border.
      #
      # @param model [Border]
      # @param client [Object]
      # @return [Vedeu::DSL::Border]
      def initialize(model, client = nil)
        @model  = model
        @client = client
      end

      # Set the character to be used to draw the bottom left corner of the
      # border.
      #
      #   Vedeu.border 'border_demo' do
      #     bottom_left '+'
      #     # ... some code
      #   end
      #
      # @param char [String] Character to be used as the bottom left border
      #   character.
      # @return [String]
      def bottom_left(char)
        model.bottom_left = char
      end

      # Set the character to be used to draw the bottom right corner of the
      # border.
      #
      #   Vedeu.border 'border_demo' do
      #     bottom_right '+'
      #     # ... some code
      #   end
      #
      # @param char [String] Character to be used as the bottom right border
      #   character.
      # @return [String]
      def bottom_right(char)
        model.bottom_right = char
      end

      # Disable the border:
      #
      #   Vedeu.border 'border_demo' do
      #     disable!
      #     # ... some other code (will be ignored)
      #   end
      #
      # @return [Boolean]
      def disable!
        model.enabled = false

        hide_bottom!
        hide_left!
        hide_right!
        hide_top!

        model.enabled
      end

      # Enable the border:
      # (Borders are enabled by default when defined for an interface).
      #
      #   Vedeu.border 'border_demo' do
      #     enable!
      #     # ... some code
      #   end
      #
      # @return [Boolean]
      def enable!
        model.enabled = true

        show_bottom!
        show_left!
        show_right!
        show_top!

        model.enabled
      end

      # Set the character to be used to draw a horizontal part of the border.
      #
      #   Vedeu.border 'border_demo' do
      #     horizontal '-'
      #     # ... some code
      #   end
      #
      # @param char [String] Character to be used as the horizontal border
      #   character.
      # @return [String]
      def horizontal(char)
        model.horizontal = char
      end

      # Enable/disable the bottom border.
      #
      #   Vedeu.border 'border_demo' do
      #     bottom true  # or...
      #     bottom false # or...
      #     hide_bottom! # or...
      #     show_bottom!
      #     # ... some code
      #   end
      #
      # @param value [Boolean] All values evaluate as true except nil and
      #   false.
      # @return [Boolean]
      def bottom(value)
        boolean = value ? true : false

        model.show_bottom = boolean
      end
      alias_method :show_bottom, :bottom

      # Disable the bottom border.
      #
      # @see Vedeu::DSL::Border#bottom
      def hide_bottom!
        bottom(false)
      end

      # Enable the bottom border.
      #
      # @see Vedeu::DSL::Border#bottom
      def show_bottom!
        bottom(true)
      end

      # Enable/disable the left border.
      #
      #   Vedeu.border 'border_demo' do
      #     left true  # or...
      #     left false # or...
      #     hide_left! # or...
      #     show_left!
      #     # ... some code
      #   end
      #
      # @param value [Boolean] All values evaluate as true except nil and
      #   false.
      # @return [Boolean]
      def left(value)
        boolean = value ? true : false

        model.show_left = boolean
      end
      alias_method :show_left, :left

      # Disable the left border.
      #
      # @see Vedeu::DSL::Border#left
      def hide_left!
        left(false)
      end

      # Enable the left border.
      #
      # @see Vedeu::DSL::Border#left
      def show_left!
        left(true)
      end

      # Enable/disable the right border.
      #
      #   Vedeu.border 'border_demo' do
      #     right true  # or...
      #     right false # or...
      #     hide_right! # or...
      #     show_right!
      #     # ... some code
      #   end
      #
      # @param value [Boolean] All values evaluate as true except nil and
      #   false.
      # @return [Boolean]
      def right(value)
        boolean = value ? true : false

        model.show_right = boolean
      end
      alias_method :show_right, :right

      # Disable the right border.
      #
      # @see Vedeu::DSL::Border#right
      def hide_right!
        right(false)
      end

      # Enable the right border.
      #
      # @see Vedeu::DSL::Border#right
      def show_right!
        right(true)
      end

      # If you have you are showing a top border, you could add a title.
      #
      #   Vedeu.border 'border_demo' do
      #     title 'My Cool Title'
      #     # ... some code
      #   end
      #
      # produces, depending on other customisations:
      #
      #   +- My Cool Title --------------------------------+
      #
      # @param value [String] The title.
      # @return [String]
      def title(value)
        model.title = value
      end

      # Enable/disable the top border.
      #
      #   Vedeu.border 'border_demo' do
      #     top true  # or...
      #     top false # or...
      #     hide_top! # or...
      #     show_top!
      #     # ... some code
      #   end
      #
      # @param value [Boolean] All values evaluate as true except nil and
      #   false.
      # @return [Boolean]
      def top(value)
        boolean = value ? true : false

        model.show_top = boolean
      end
      alias_method :show_top, :top

      # Disable the top border.
      #
      # @see Vedeu::DSL::Border#top
      def hide_top!
        top(false)
      end

      # Enable the top border.
      #
      # @see Vedeu::DSL::Border#top
      def show_top!
        top(true)
      end

      # Set the character to be used to draw the top left corner of the border.
      #
      #   Vedeu.border 'border_demo' do
      #     top_left '+'
      #     # ... some code
      #   end
      #
      # @param char [String] Character to be used as the top left border
      #   character.
      # @return [String]
      def top_left(char)
        model.top_left = char
      end

      # Set the character to be used to draw the top right corner of the border.
      #
      #   Vedeu.border 'border_demo' do
      #     top_right '+'
      #     # ... some code
      #   end
      #
      # @param char [String] Character to be used as the top right border
      #   character.
      # @return [String]
      def top_right(char)
        model.top_right = char
      end

      # Set the character to be used to draw a vertical part of the border.
      #
      #   Vedeu.border 'border_demo' do
      #     vertical '|'
      #     # ... some code
      #   end
      #
      # @param char [String] Character to be used as the vertical border
      #   character.
      # @return [String]
      def vertical(char)
        model.vertical = char
      end

      protected

      # @!attribute [r] client
      # @return [Object]
      attr_reader :client

      # @!attribute [r] model
      # @return [Vedeu::Border]
      attr_reader :model

    end # Border

  end # DSL

end # Vedeu