require 'modularize'

module RestPack::Service
  class Command < Mutations::Command
    attr_accessor :response

    def run
      @response = RestPack::Service::Response.new

      begin
        init
        mutation = super

        if mutation.errors
          mutation.errors.message.each do |error|
            @response.add_error(error[0], error[1].gsub(error[0].capitalize, ''))
          end

          @response.status ||= :unprocessable_entity
        else
          @response.status ||= :ok
        end

        if @response.status == :ok
          @response.result = mutation.result if mutation.result
        end
      rescue Exception => e
        puts "---COMMAND EXCEPTION---"
        puts e.message #TODO: GJ: logging
        puts e.backtrace
        puts "-----------------------"

        @response.add_error(:base, 'Service Error')
        @response.status = :internal_service_error
      end

      @response
    end

    def init
    end

    def status(status)
      @response.status = status
    end

    def valid?
      !has_errors?
    end

    def service_error(message)
      field_error :base, message
    end

    def field_error(key, message)
      add_error key, key, message
    end

    def Serializer
      self.class.serializer_class
    end

    def Model
      self.class.model_class
    end

    def self.inherited(command)
      namespaces = command.to_s.split('::') # eg. GroupService::Commands::Group::Create
      add_module_aliases(command, namespaces)
    end

    private

    def self.add_module_aliases(command, namespaces)
      Modularize.create("#{namespaces[0]}::Models")
      Modularize.create("#{namespaces[0]}::Serializers")
      Modularize.create("#{namespaces[0]}::#{namespaces[2]}")

      model_class = "#{namespaces[0]}::Models::#{namespaces[2]}".safe_constantize
      if model_class
        command.const_set(:Model, model_class)
        command.send(:define_singleton_method, "model_class") { model_class }
      end

      serializer_class = "#{namespaces[0]}::Serializers::#{namespaces[2]}".safe_constantize
      if serializer_class
        command.const_set(:Serializer, serializer_class)
        command.send(:define_singleton_method, "serializer_class") { serializer_class }
      end

      command.const_set(:Commands, "#{namespaces[0]}::Commands".safe_constantize)
      command.const_set(:Models, "#{namespaces[0]}::Models".safe_constantize)
    end

    def self.method_container_module(command, namespaces)
      if namespaces[1] == 'Commands'
        "#{namespaces[0]}::#{namespaces[2]}".safe_constantize #GroupService::Group
      else
        namespaces.take(namespaces.length - 1).join('::').safe_constantize #Commands::Group
      end
    end
  end
end

#TODO: GJ: remove this legacy class
# module RestPack::Service
#   class Command < Mutations::Command
#     attr_accessor :response

#     def run
#       @response = Response.new

#       begin
#         init
#         mutation = super

#         if mutation.errors
#           mutation.errors.message.each do |error|
#             @response.add_error(error[0], error[1].gsub(error[0].capitalize, ''))
#           end

#           @response.status ||= :unprocessable_entity
#         else
#           @response.status ||= :ok
#         end

#         if @response.status == :ok
#           @response.result = mutation.result if mutation.result
#         end
#       rescue Exception => e
#         puts "---COMMAND EXCEPTION---"
#         puts e.message #TODO: GJ: logging
#         puts e.backtrace
#         puts "-----------------------"

#         @response.add_error(:base, 'Service Error')
#         @response.status = :internal_service_error
#       end

#       @response
#     end

#     def init
#     end

#     def status(status)
#       @response.status = status
#     end

#     def valid?
#       !has_errors?
#     end

#     def service_error(message)
#       field_error :base, message
#     end

#     def field_error(key, message)
#       add_error key, key, message
#     end

#     def get
#       identifier = service_identifiers[:resources]
#       result = Serializer.resource(inputs)

#       if result[identifier].empty?
#         status :not_found
#       else
#         result
#       end
#     end

#     def list
#       serializer_klass.resource(inputs)
#     end

#     def create!
#       identifier = service_identifiers[:resources]
#       models = create_models!(inputs[identifier])
#       serialize(models)
#     end

#     def single_create!
#       identifier = service_identifiers[:resources]
#       model = model_klass.create!(inputs)
#       as_json(model)
#     end

#     def serialize(models)
#       serializer_klass.serialize(models)
#     end

#     def as_json(model)
#       serializer_klass.as_json(model)
#     end



#     def create_models!(array)
#       model_klass.create!(array)
#     end

#     def serializer_klass
#       "Serializers::#{service_namespace}".constantize
#     end

#     def model_klass
#       "Models::#{service_namespace}".constantize
#     end

#     def service_namespace
#       identifiers = service_identifiers
#       namespace = "#{identifiers[:service]}::#{identifiers[:resource].capitalize}"
#     end

#     def service_identifiers
#       #extract identifiers from ancestor in the form of 'Commands::Core::Application::Get'
#       namespaces = self.class.ancestors.first.to_s.split('::')
#       resource = namespaces[2].downcase
#       return {
#         service: namespaces[1].to_sym,
#         resource: resource.to_sym,
#         resources: resource.pluralize.to_sym
#       }
#     end
#   end
# end