StatOutStream.h

// Copyright 2026 Matteo Fusi and Contributors
//
// 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 SIMO_STATOUTSTREAM_HH
#define SIMO_STATOUTSTREAM_HH
 
#include <glaze/yaml.hpp>
 
namespace Simo::Statistics {
 
class StatMapper;
class Statistic;

class StatOutStreamInterface {
 public:
  virtual ~StatOutStreamInterface() = default;
 
  template <typename Self>
  Self& operator<<(this Self&& self, const Statistic& s) {
    return self << s;
  }
 
  template <typename Self>
  void reset(this Self&& self) {
    self.reset();
  }
  template <typename Self>
  void generate(this Self&& self) {
    self.generate();
  }
};

class StatOutStream : public StatOutStreamInterface {
 public:
  ~StatOutStream() override = default;
 
  StatOutStream() : array(glz::generic_u64::array_t{}) {}
 
  std::filesystem::path output_path() const { return output_path_; }
  void output_path(std::filesystem::path path) {
    output_path_ = std::move(path);
  }
 
  StatOutStream& operator<<(const Statistic& s) {
    array.get<glz::generic_u64::array_t>().emplace_back(
        s.dump_representation());
    return *this;
  }
 
  void reset() { array = glz::generic_u64::array_t{}; }
 
  void generate() {
    std::string buffer;
    // TODO hanndle errors
    auto _ = glz::write_file_yaml(array, output_path().c_str());
  }
 
 private:
  std::filesystem::path output_path_;
  glz::generic_u64 array;
};
}  // namespace Simo::Statistics
 
#endif  // SIMO_STATOUTSTREAM_HH