// Copyright 2020 The Tint 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 SRC_AST_TYPE_MANAGER_H_
#define SRC_AST_TYPE_MANAGER_H_

#include <memory>
#include <string>
#include <unordered_map>
#include <utility>

#include "src/ast/type/type.h"

namespace tint {
namespace ast {

/// The type manager holds all the pointers to the known types.
class TypeManager {
 public:
  /// Constructor
  TypeManager();

  /// Move constructor
  TypeManager(TypeManager&&);

  /// Move assignment operator
  /// @param rhs the TypeManager to move
  /// @return this TypeManager
  TypeManager& operator=(TypeManager&& rhs);

  /// Destructor
  ~TypeManager();

  /// Clears all registered types.
  void Reset();

  /// Get the given type from the type manager
  /// @param type The type to register
  /// @return the pointer to the registered type
  type::Type* Get(std::unique_ptr<type::Type> type);

  /// Get the given type `T` from the type manager
  /// @param args the arguments to pass to the type constructor
  /// @return the pointer to the registered type
  template <typename T, typename... ARGS>
  T* Get(ARGS&&... args) {
    auto ty = Get(std::make_unique<T>(std::forward<ARGS>(args)...));
    return static_cast<T*>(ty);
  }

  /// Returns the type map
  /// @returns the mapping from name string to type.
  const std::unordered_map<std::string, std::unique_ptr<type::Type>>& types() {
    return types_;
  }

 private:
  std::unordered_map<std::string, std::unique_ptr<type::Type>> types_;
};

}  // namespace ast
}  // namespace tint

#endif  // SRC_AST_TYPE_MANAGER_H_