# Glimmer - a JRuby DSL that enables easy and efficient authoring of user
# interfaces using the robust platform-independent Eclipse SWT library. Glimmer
# comes with built-in data-binding support to greatly facilitate synchronizing
# UI with domain models.
require 'logger'
require 'set'

$LOAD_PATH.unshift(File.expand_path('..', __FILE__))

require 'glimmer/config'

# Glimmer provides a JRuby Desktop UI DSL + Data-Binding functionality
#
# A desktop UI application class must include Glimmer to gain access to Glimmer DSL
#
# Glimmer DSL static keywords (e.g. rgb, bind, etc..) are available as inherited methods
# Glimmer DSL dynamic keywords (e.g. label, combo, etc...) are available via method_missing
module Glimmer
  #TODO make it configurable to include or not include perhaps reverting to using included
  REGEX_METHODS_EXCLUDED = /^(to_|\[)/
  
  # TODO add loop detection support to avoid infinite loops (perhaps breaks after 3 repetitions and provides an option to allow it if intentional)
  class << self
    attr_accessor :loop_last_data
    
    def loop_reset!(including_loop_last_data = false)
      @loop_last_data = nil if including_loop_last_data
      @loop = 1
    end
    
    def loop
      @loop ||= loop_reset!
    end
    
    def loop_increment!
      @loop = loop + 1
    end
  end

  def method_missing(method_symbol, *args, &block)
    new_loop_data = [method_symbol, args, block]
    if new_loop_data == Glimmer.loop_last_data
      Glimmer.loop_increment!
      if Glimmer.loop == Config.loop_max_count
        raise "Glimmer looped #{Config.loop_max_count} times with keyword '#{new_loop_data[0]}'! Check code for errors."
      end
    else
      Glimmer.loop_reset!
    end
    Glimmer.loop_last_data = new_loop_data
    # This if statement speeds up Glimmer in girb or whenever directly including on main object
    if method_symbol.to_s.match(REGEX_METHODS_EXCLUDED)
      raise ExcludedKeywordError, "Glimmer excluded keyword: #{method_symbol}"
    end
    Glimmer::Config.logger.debug {"Interpreting keyword: #{method_symbol}"}
    Glimmer::DSL::Engine.interpret(method_symbol, *args, &block)
  rescue ExcludedKeywordError => e
    # TODO add a feature to show excluded keywords optionally for debugging purposes
    super(method_symbol, *args, &block)
  rescue InvalidKeywordError => e
    if !method_symbol.to_s.match(REGEX_METHODS_EXCLUDED)
      Glimmer::Config.logger.error {e.message}
    end
    Glimmer::Config.logger.debug {"#{e.message}\n#{e.backtrace.join("\n")}"}
    super(method_symbol, *args, &block)
  end
end

require 'glimmer/error'
require 'glimmer/excluded_keyword_error'
require 'glimmer/invalid_keyword_error'
require 'glimmer/dsl/engine'