require File.dirname(__FILE__) + "/../../command_handler"
require File.dirname(__FILE__) + "/../g_widget"
require File.dirname(__FILE__) + "/../custom_widget"
require File.dirname(__FILE__) + "/../model_binding"

module Glimmer
  module SWT
    module CommandHandlers
      # Responsible for setting up the return value of the bind keyword (command symbol)
      # as a ModelBinding. It is then used by another command handler like
      # DataBindingCommandHandler for text and selection properties on Text and Spinner
      # or TableItemsDataBindingCommandHandler for items in a Table
      class BindCommandHandler
        include CommandHandler

        include_package 'org.eclipse.swt.widgets'

        def can_handle?(parent, command_symbol, *args, &block)
          # TODO refactor this long condition below
          (
            (parent.is_a?(GWidget) || parent.is_a?(CustomWidget)) and
            command_symbol.to_s == "bind" and
            (
              (
                (args.size == 2) and
                  (
                    args[1].is_a?(Symbol) or
                    args[1].is_a?(String)
                  )
              ) or
                (
                  (args.size == 3) and
                  (args[1].is_a?(Symbol) or args[1].is_a?(String)) and
                  (args[2].is_a?(Symbol) or args[2].is_a?(String) or args[2].is_a?(Hash))
                ) or
                (
                  (args.size == 4) and
                  (args[1].is_a?(Symbol) or args[1].is_a?(String)) and
                  (args[2].is_a?(Symbol) or args[2].is_a?(String)) and
                  (args[3].is_a?(Hash))
                )
            ) and
              block == nil
          )
        end

        def do_handle(parent, command_symbol, *args, &block)
          property_type = args[2] if (args.size == 3) && !args[2].is_a?(Hash)
          binding_options = args[2] if args[2].is_a?(Hash)
          binding_options = args[3] if args[3].is_a?(Hash)
          ModelBinding.new(args[0], args[1].to_s, property_type, binding_options)
        end
      end
    end
  end
end