# Copyright (C) 2014-2015  Kouhei Sutou <kou@cozmixng.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

require "English"

if ENV["RABBIT_GTK_VERSION"] == "3"
  require "gtk3"
  Gtk.init if Gtk.respond_to?(:init)
else
  require "cairo"
  require "gio2"
  require "gtk2"
end

module Cairo
  class Region
    unless public_method_defined?(:each_rectangle)
      def each_rectangle
        num_rectangles.times do |i|
          yield(self[i])
        end
      end
    end
  end
end

module Pango
  unless const_defined?(:WrapMode)
    WrapMode = Layout::WrapMode
  end

  unless const_defined?(:Alignment)
    Alignment = Layout::Alignment
  end
end

module Gdk
  class Event
    STOP = true unless const_defined?(:STOP)
    PROPAGATE = false unless const_defined?(:PROPAGATE)
  end

  class Window
    unless method_defined?(:width)
      def width
        size[0]
      end
    end

    unless method_defined?(:height)
      def height
        size[1]
      end
    end
  end

  unless const_defined?(:EventType)
    EventType = Event::Type
  end

  unless const_defined?(:ModifierType)
    ModifierType = Window::ModifierType
  end

  unless const_defined?(:EventMask)
    EventMask = Event::Mask
  end

  module Keyval
    constants.each do |name|
      if /\AGDK_KEY_/ =~ name.to_s
        const_set("KEY_#{$POSTMATCH}", const_get(name))
      end
    end
  end

  class Screen
    unless method_defined?(:get_monitor_geometry)
      alias_method :get_monitor_geometry, :monitor_geometry
    end
  end

  unless const_defined?(:ScrollDirection)
    ScrollDirection = Gdk::EventScroll::Direction
  end
end

module Gtk
  unless const_defined?(:Actionable)
    class Action
      alias_method :initialize_raw, :initialize
      def initialize(name, options={})
        initialize_raw(name,
                       options[:label],
                       options[:tooltip],
                       options[:stock_id])

      end
    end
  end

  unless const_defined?(:Application)
    class Application < Gio::Application
      attr_reader :windows
      def initialize(id, flags)
        super
        signal_connect_after("activate") do
          Gtk.main unless @windows.empty?
        end
        @windows = []
      end
    end
  end

  unless const_defined?(:ApplicationWindow)
    class ApplicationWindow
      class << self
        def new(application)
          window = Window.new
          application.windows << window
          window.signal_connect("destroy") do
            windows = application.windows
            windows.delete(window)
            Gtk.main_quit if windows.empty?
          end
          window
        end
      end
    end
  end

  class Widget
    unless public_method_defined?(:drag_dest_set)
      def drag_dest_set(flags, targets, actions)
        Gtk::Drag.dest_set(self, flags, targets, actions)
      end
    end

    unless public_method_defined?(:shape_combine_region)
      def shape_combine_region(cairo_region)
        gdk_region = cairo_region_to_gdk_region(cairo_region)
        window.shape_combine_region(gdk_region, 0, 0)
      end
    end

    private
    def cairo_region_to_gdk_region(cairo_region)
      return nil if cairo_region.nil?

      gdk_region = Gdk::Region.new
      cairo_region.each_rectangle do |rectangle|
        gdk_region.union(Gdk::Rectangle.new(*rectangle))
      end
      gdk_region
    end
  end

  if Box.gtype.abstract?
    class HBox
      class << self
        alias_method :new_raw, :new
        def new(*arguments)
          new_raw(*arguments)
        end
      end
    end

    class VBox
      class << self
        alias_method :new_raw, :new
        def new(*arguments)
          new_raw(*arguments)
        end
      end
    end

    class Box
      class << self
        def new(type)
          case type
          when :horizontal
            HBox.new
          when :vertical
            VBox.new
          else
            raise ArgumentError,
                  "Box type must be :horizontal or :vertical: #{type.inspect}"
          end
        end
      end
    end
  end
end