module Protobuf::Descriptor

def self.id2label(label_id)
  require 'protobuf/descriptor/descriptor_proto'
  case label_id
  when Google::Protobuf::FieldDescriptorProto::Label::LABEL_REQUIRED then
    :required
  when Google::Protobuf::FieldDescriptorProto::Label::LABEL_OPTIONAL then
    :optional
  when Google::Protobuf::FieldDescriptorProto::Label::LABEL_REPEATED then
    :repeated
  else
    raise ArgumentError, "Invalid label: #{proto.label}"
  end
end

def self.id2type(type_id)
  require 'protobuf/descriptor/descriptor_proto'
  case type_id
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_DOUBLE then
    :double
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_FLOAT then
    :float
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_INT64 then
    :int64
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_UINT64 then
    :unit64
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_INT32 then
    :int64
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_FIXED64 then
    :fixed64
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_FIXED32 then
    :fixed32
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_BOOL then
    :bool
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_STRING then
    :string
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_GROUP then
    :group
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_MESSAGE then
    :message
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_BYTES then
    :bytes
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_UINT32 then
    :uint32
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_ENUM then
    :enum
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_SFIXED32 then
    :sfixed32
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_SFIXED64 then
    :sfixed64
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_SINT32 then
    :sint32
  when Google::Protobuf::FieldDescriptorProto::Type::TYPE_SINT64 then
    :sint64
  else
    raise ArgumentError, "Invalid type: #{proto.type}"
  end
end

def self.label2id(label)
  require 'protobuf/descriptor/descriptor_proto'
  case label
  when :required then
    Google::Protobuf::FieldDescriptorProto::Label::LABEL_REQUIRED
  when :optional then
    Google::Protobuf::FieldDescriptorProto::Label::LABEL_OPTIONAL
  when :repeated then
    Google::Protobuf::FieldDescriptorProto::Label::LABEL_REPEATED
  else
    raise ArgumentError, "Invalid label: #{label}"
  end
end

def self.type2id(type)
  require 'protobuf/descriptor/descriptor_proto'
  case type
  when :double then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_DOUBLE 
  when :float then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_FLOAT
  when :int64 then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_INT64 
  when :unit64 then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_UINT64 
  when :int64 then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_INT32 
  when :fixed64 then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_FIXED64 
  when :fixed32 then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_FIXED32 
  when :bool then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_BOOL 
  when :string then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_STRING 
  when :group then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_GROUP 
  when :message then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_MESSAGE 
  when :bytes then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_BYTES
  when :uint32 then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_UINT32 
  when :enum then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_ENUM 
  when :sfixed32 then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_SFIXED32 
  when :sfixed64 then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_SFIXED64 
  when :sint32 then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_SINT32 
  when :sint64 then
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_SINT64 
  else
    Google::Protobuf::FieldDescriptorProto::Type::TYPE_MESSAGE
  end
end