// Copyright 2020 Google LLC
//
// 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
//
//     https://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 SANDBOXED_API_TOOLS_CLANG_GENERATOR_EMITTER_H_
#define SANDBOXED_API_TOOLS_CLANG_GENERATOR_EMITTER_H_

#include <string>
#include <vector>

#include "absl/container/flat_hash_map.h"
#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "absl/strings/string_view.h"
#include "clang/AST/Decl.h"
#include "clang/AST/Type.h"
#include "sandboxed_api/tools/clang_generator/types.h"

namespace sapi {
namespace internal {

absl::StatusOr<std::string> ReformatGoogleStyle(const std::string& filename,
                                                const std::string& code);

}  // namespace internal

class GeneratorOptions;

class Emitter {
 public:
  using RenderedTypesMap =
      absl::flat_hash_map<std::string, std::vector<std::string>>;

  void CollectType(clang::QualType qual);
  void CollectFunction(clang::FunctionDecl* decl);

  // Outputs a formatted header for a list of functions and their related types.
  absl::StatusOr<std::string> EmitHeader(const GeneratorOptions& options);

 protected:
  // Maps namespace to a list of spellings for types
  RenderedTypesMap rendered_types_;

  // Functions for sandboxed API, including their bodies
  std::vector<std::string> functions_;
};

// Constructs an include guard name for the given filename. The name is of the
// same form as the include guards in this project.
// For example,
//   sandboxed_api/examples/zlib/zlib-sapi.sapi.h
// will be mapped to
//   SANDBOXED_API_EXAMPLES_ZLIB_ZLIB_SAPI_SAPI_H_
std::string GetIncludeGuard(absl::string_view filename);

}  // namespace sapi

#endif  // SANDBOXED_API_TOOLS_CLANG_GENERATOR_EMITTER_H_