# Copyright: Copyright 2009 Topic Maps Lab, University of Leipzig.
# License:   Apache License, Version 2.0

module RTM::Revision
  Type = Java::DeTopicmapslabMajortomModelEvent::TopicMapEventType
  
  def self.specify_event(type)
    return (
      case type
      when Type::ASSOCIATION_ADDED
        :creation
      when Type::ASSOCIATION_REMOVED
        :deletion
      when Type::DATATYPE_SET
        :update
      when Type::ID_MODIFIED
        :update
      when Type::ITEM_IDENTIFIER_ADDED
        :update
      when Type::ITEM_IDENTIFIER_REMOVED
        :update
      when Type::MERGE
        :update
      when Type::NAME_ADDED
        :update
      when Type::NAME_REMOVED
        :update
      when Type::OCCURRENCE_ADDED
        :update
      when Type::OCCURRENCE_REMOVED
        :update
      when Type::PLAYER_MODIFIED
        :update
      when Type::REIFIER_SET
        :update
      when Type::REMOVE_DUPLICATES
        :update
      when Type::ROLE_ADDED
        :update
      when Type::ROLE_REMOVED
        :update
      when Type::SCOPE_MODIFIED
        :update
      when Type::SUBJECT_IDENTIFIER_ADDED
        :update
      when Type::SUBJECT_IDENTIFIER_REMOVED
        :update
      when Type::SUBJECT_LOCATOR_ADDED
        :update
      when Type::SUBJECT_LOCATOR_REMOVED
        :update
      when Type::TOPIC_ADDED
        :creation
      when Type::TOPIC_REMOVED
        :deletion
      when Type::TYPE_ADDED
        :update
      when Type::TYPE_REMOVED
        :update
      when Type::TYPE_SET
        :update
      when Type::VALUE_MODIFIED
        :update
      when Type::VARIANT_ADDED
        :update
      when Type::VARIANT_REMOVED
        :update
      else
        nil
      end )
  end

  def self.topic_or_association_context(revision)
    # TODO not finished yet, test it also in the history_spec
    type = revision.changeset_type
    changeset = revision.changeset
    
    case type
    when Type::ASSOCIATION_ADDED
      context = changeset.first.new_value # association
    when Type::ASSOCIATION_REMOVED
      context = changeset.last.old_value # association
    when Type::DATATYPE_SET
      datatype_aware = changeset.first.context
      if datatype_aware.is_a?(RTM::Occurrence)
        context = datatype_aware.parent # topic
      else
        context = datatype_aware.parent.parent # topic
      end
    when Type::ID_MODIFIED
      return nil
    when Type::ITEM_IDENTIFIER_ADDED
      context = changeset.first.context # topic
    when Type::ITEM_IDENTIFIER_REMOVED
      context = changeset.first.context # topic
    when Type::MERGE
      return nil
    when Type::NAME_ADDED
      context = changeset.first.context # topic
    when Type::NAME_REMOVED
      context = changeset.last.context # topic
    when Type::OCCURRENCE_ADDED
      context = changeset.first.context # topic
    when Type::OCCURRENCE_REMOVED
      context = changeset.last.context # topic
    when Type::PLAYER_MODIFIED
      context = changeset.first.context.parent # association
    when Type::REIFIER_SET
      return nil
    when Type::REMOVE_DUPLICATES
      return nil
    when Type::ROLE_ADDED
      context = changeset.first.context # association
    when Type::ROLE_REMOVED
      context = changeset.last.context # association
    when Type::SCOPE_MODIFIED
      typed = changeset.first.context
      if typed.is_a?(RTM::Variant)
        context = typed.parent.parent # topic
      elsif typed.is_a?(RTM::Occurrence)
        context = typed.parent # topic
      elsif typed.is_a?(RTM::Name)
        context = typed.parent # topic
      else
        context = typed # association
      end
    when Type::SUBJECT_IDENTIFIER_ADDED
      context = changeset.first.context # topic
    when Type::SUBJECT_IDENTIFIER_REMOVED
      context = changeset.first.context # topic
    when Type::SUBJECT_LOCATOR_ADDED
      context = changeset.first.context # topic
    when Type::SUBJECT_LOCATOR_REMOVED
      context = changeset.first.context # topic
    when Type::TOPIC_ADDED
      context = changeset.first.new_value # topic
    when Type::TOPIC_REMOVED
      context = changeset.last.old_value # topic
    when Type::TYPE_ADDED
      context = changeset.first.context # topic
    when Type::TYPE_REMOVED
      context = changeset.first.context # topic
    when Type::TYPE_SET
      typed = changeset.first.context
      if typed.is_a?(RTM::Role)
        context = typed.parent # association
      elsif typed.is_a?(RTM::Association)
        context = typed # association
      else
        context = typed.parent # topic
      end
    when Type::VALUE_MODIFIED
      valued = changeset.first.context
      if valued.is_a?(RTM::Variant)
        context = valued.parent.parent #topic
      else
        context = valued.parent # topic
      end
    when Type::VARIANT_ADDED
      context = changeset.first.context.parent # topic
    when Type::VARIANT_REMOVED
      context = changeset.last.context.parent # topic
    else
      return nil
    end
    return context
  end
end