# Adhearsion, open source collaboration framework
# Copyright (C) 2006,2007,2008 Jay Phillips
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

require 'adhearsion/foundation/metaprogramming'
require 'adhearsion/voip/conveniences'
require 'adhearsion/voip/constants'
require 'adhearsion/voip/dsl/dialing_dsl/dialing_dsl_monkey_patches'

module Adhearsion
  module VoIP
    module DSL
      class DialingDSL

        extend  Conveniences
        include Constants

        Regexp.class_eval do
          include Adhearsion::VoIP::DSL::DialingDSL::MonkeyPatches::RegexpMonkeyPatch
        end

        def self.inherited(klass)
          klass.class_eval do
            [:@@providers, :@@routes].each do |var|
              class_variable_set(var, [])
              cattr_reader var.to_s.gsub('@@', '')
            end
          end
        end

        def self.calculate_routes_for(destination)
          destination = destination.to_s
          routes.select { |defined_route| defined_route === destination }.map &:providers
        end

        class ProviderDefinition < OpenStruct

          def initialize(name)
            super()
            self.name = name.to_s.to_sym
          end

          def >>(other)
            RouteRule.new :providers => [self, other]
          end

          def format_number_for_platform(number, platform=:asterisk)
            case platform
              when :asterisk
                [protocol || "SIP", name || "default", number].join '/'
              else
                raise "Unsupported platform #{platform}!"
            end
          end

          def format_number_for_platform(number, platform=:asterisk)
            case platform
              when :asterisk
                [protocol || "SIP", name || "default", number].join '/'
              else
                raise "Unsupported platform #{platform}!"
            end
          end

          def defined_properties_without_name
            @table.clone.tap do |copy|
              copy.delete :name
            end
          end

        end

        protected

        def self.provider(name, &block)
          raise ArgumentError, "no block given" unless block_given?

          options = ProviderDefinition.new name
          yield options

          providers << options
          meta_def(name) { options }
        end

        def self.route(route)
          routes << route
        end

        class RouteRule

          attr_reader :patterns, :providers

          def initialize(hash={})
            @patterns  = Array hash[:patterns]
            @providers = Array hash[:providers]
          end

          def merge!(other)
            providers.concat other.providers
            patterns.concat  other.patterns
            self
          end

          def >>(other)
            case other
              when RouteRule then merge! other
              when ProviderDefinition then providers << other
              else raise RouteException, "Unrecognized object in route definition: #{other.inspect}"
            end
            self
          end

          def |(other)
            case other
              when RouteRule then merge! other
              when Regexp
                patterns << other
                self
              else raise other.inspect
            end
          end

          def ===(other)
            patterns.each { |pattern| return true if pattern === other }
            false
          end

          def unshift_pattern(pattern)
            patterns.unshift pattern
          end

          class RouteException < StandardError; end

        end
      end
    end
  end
end