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//
// Created by Eduard Valeyev on 2019-03-11.
//

#ifndef SEQUANT_LOGGER_HPP
#define SEQUANT_LOGGER_HPP

#include <SeQuant/core/utility/singleton.hpp>

#include <iostream>

namespace sequant {

struct Logger : public Singleton<Logger> {
  bool wick_harness = false;
  bool wick_topology = false;
  bool wick_contract = false;
  bool wick_reduce = false;
  bool wick_stats = false;
  bool expand = false;
  bool canonicalize = false;
  bool canonicalize_input_graph = false;
  bool canonicalize_dot = false;
  bool simplify = false;
  bool tensor_network = false;
  bool export_equations = false;

  struct {
    size_t level;

    std::ostream* stream;
  } eval = {0, nullptr};

 private:
  friend class Singleton<Logger>;
  Logger(int log_level = 0) {
    if (log_level > 0) {
      wick_topology = true;
      wick_contract = true;
      wick_reduce = true;
      wick_stats = true;
      expand = true;
      canonicalize = true;
      simplify = true;
      tensor_network = true;
      export_equations = true;
    }
  }
};

template <typename... Args>
void write_log(Logger& l, Args const&... args) noexcept {
  if (l.eval.stream) {
    ((*l.eval.stream << args), ...);
    (*l.eval.stream).flush();
  }
}

}  // namespace sequant

#endif  // SEQUANT_LOGGER_HPP