/*
 *
 * Copyright 2015 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#ifndef GRPC_INTERNAL_COMPILER_SCHEMA_INTERFACE_H
#define GRPC_INTERNAL_COMPILER_SCHEMA_INTERFACE_H

#include <memory>
#include <util/generic/string.h>
#include <util/string/cast.h>
#include <vector>

#include "src/compiler/config.h"

#ifdef GRPC_CUSTOM_STRING
#warning GRPC_CUSTOM_STRING is no longer supported. Please use TString.
#endif

namespace grpc {

// Using grpc::string and grpc::to_string is discouraged in favor of
// TString and ::ToString. This is only for legacy code using
// them explictly.
typedef TString string;     // deprecated

}  // namespace grpc

namespace grpc_generator {

// A common interface for objects having comments in the source.
// Return formatted comments to be inserted in generated code.
struct CommentHolder {
  virtual ~CommentHolder() {}
  virtual TString GetLeadingComments(const TString prefix) const = 0;
  virtual TString GetTrailingComments(const TString prefix) const = 0;
  virtual std::vector<TString> GetAllComments() const = 0;
};

// An abstract interface representing a method.
struct Method : public CommentHolder {
  virtual ~Method() {}

  virtual TString name() const = 0;

  virtual TString input_type_name() const = 0;
  virtual TString output_type_name() const = 0;

  virtual bool get_module_and_message_path_input(
      TString* str, TString generator_file_name,
      bool generate_in_pb2_grpc, TString import_prefix,
      const std::vector<TString>& prefixes_to_filter) const = 0;
  virtual bool get_module_and_message_path_output(
      TString* str, TString generator_file_name,
      bool generate_in_pb2_grpc, TString import_prefix,
      const std::vector<TString>& prefixes_to_filter) const = 0;

  virtual TString get_input_type_name() const = 0;
  virtual TString get_output_type_name() const = 0;
  virtual bool NoStreaming() const = 0;
  virtual bool ClientStreaming() const = 0;
  virtual bool ServerStreaming() const = 0;
  virtual bool BidiStreaming() const = 0;
};

// An abstract interface representing a service.
struct Service : public CommentHolder {
  virtual ~Service() {}

  virtual TString name() const = 0;

  virtual int method_count() const = 0;
  virtual std::unique_ptr<const Method> method(int i) const = 0;
};

struct Printer {
  virtual ~Printer() {}

  virtual void Print(const std::map<TString, TString>& vars,
                     const char* template_string) = 0;
  virtual void Print(const char* string) = 0;
  virtual void PrintRaw(const char* string) = 0;
  virtual void Indent() = 0;
  virtual void Outdent() = 0;
};

// An interface that allows the source generated to be output using various
// libraries/idls/serializers.
struct File : public CommentHolder {
  virtual ~File() {}

  virtual TString filename() const = 0;
  virtual TString filename_without_ext() const = 0;
  virtual TString package() const = 0;
  virtual std::vector<TString> package_parts() const = 0;
  virtual TString additional_headers() const = 0;
  virtual std::vector<TString> GetImportNames() const { return {}; }

  virtual int service_count() const = 0;
  virtual std::unique_ptr<const Service> service(int i) const = 0;

  virtual std::unique_ptr<Printer> CreatePrinter(TString* str) const = 0;
};
}  // namespace grpc_generator

#endif  // GRPC_INTERNAL_COMPILER_SCHEMA_INTERFACE_H