configuration.h

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/*
 *
 *    Copyright (c) 2014-2019
 *      SMASH Team
 *
 *    GNU General Public License (GPLv3 or later)
 *
 */

#ifndef SRC_INCLUDE_CONFIGURATION_H_
#define SRC_INCLUDE_CONFIGURATION_H_

#include <array>
#include <set>
#include <stdexcept>
#include <string>
#include <utility>
#include <vector>

#include <yaml-cpp/yaml.h>  // NOLINT(build/include_order)

#include "density.h"
#include "forwarddeclarations.h"

namespace YAML {

template <typename T>
struct convert {
  static Node encode(const T &x) { return Node{static_cast<std::string>(x)}; }

  static bool decode(const Node &node, T &x) {
    if (!node.IsScalar()) {
      return false;
    } else {
      x = static_cast<T>(node.Scalar());
      return true;
    }
  }
};
}  // namespace YAML

namespace smash {
class Configuration {
 public:
  struct IncorrectTypeInAssignment : public std::runtime_error {
    using std::runtime_error::runtime_error;
  };
  struct ParseError : public std::runtime_error {
    using std::runtime_error::runtime_error;
  };

  struct FileDoesNotExist : public std::runtime_error {
    using std::runtime_error::runtime_error;
  };

  class Value {
    friend class Configuration;

    const YAML::Node node_;
    const char *const key_;

    Value(const YAML::Node &n, const char *key) : node_(n), key_(key) {
      if (!(n.IsScalar() || n.IsSequence() || n.IsMap())) {
        std::stringstream err;
        err << "Configuration value for \"" << key
            << "\" is missing or invalid";
        throw std::runtime_error(err.str());
      }
    }

   public:
    Value(const Value &) = delete;
    Value &operator=(const Value &) = delete;

    template <typename T>
    T convert_for(const T &) const {
      return *this;
    }

    template <typename T>
    operator T() const {
      try {
        return node_.as<T>();
      } catch (YAML::TypedBadConversion<T> &e) {
        throw IncorrectTypeInAssignment(
            "The value for key \"" + std::string(key_) +
            "\" cannot be converted to the requested type.");
      }
    }

    template <typename T>
    operator std::vector<T>() const {
      try {
        return node_.as<std::vector<T>>();
      } catch (YAML::TypedBadConversion<T> &e) {
        throw IncorrectTypeInAssignment(
            "One of the values in the sequence for key \"" + std::string(key_) +
            "\" failed to convert to the requested type. E.g. [1 2] is a "
            "sequence of one string \"1 2\" and [1, 2] is a sequence of two "
            "integers. Often there is just a comma missing in the config "
            "file.");
      } catch (YAML::TypedBadConversion<std::vector<T>> &e) {
        throw IncorrectTypeInAssignment(
            "The value for key \"" + std::string(key_) +
            "\" cannot be converted to the requested type. A sequence was "
            "expected but apparently not found.");
      }
    }

    template <typename T, size_t N>
    operator std::array<T, N>() const {
      const std::vector<T> vec = operator std::vector<T>();
      const size_t n_read = vec.size();
      // Alert if size does not match
      if (n_read != N) {
        throw IncorrectTypeInAssignment("Wrong number of values in array \"" +
                                        std::string(key_) + "\". Expected " +
                                        std::to_string(N) +
                                        " values,"
                                        " found " +
                                        std::to_string(n_read) + ".");
      }
      std::array<T, N> arr;
      std::copy_n(vec.begin(), N, arr.begin());
      return arr;
    }

    operator ReactionsBitSet() const {
      const std::vector<std::string> v = operator std::vector<std::string>();
      ReactionsBitSet s;
      for (const auto &x : v) {
        if (x == "All") {
          s.set();
          break;
        } else if (x == "Elastic") {
          s.set(IncludedReactions::Elastic);
        } else if (x == "NN_to_NR") {
          s.set(IncludedReactions::NN_to_NR);
        } else if (x == "NN_to_DR") {
          s.set(IncludedReactions::NN_to_DR);
        } else if (x == "KN_to_KN") {
          s.set(IncludedReactions::KN_to_KN);
        } else if (x == "KN_to_KDelta") {
          s.set(IncludedReactions::KN_to_KDelta);
        } else if (x == "Strangeness_exchange") {
          s.set(IncludedReactions::Strangeness_exchange);
        } else {
          throw IncorrectTypeInAssignment(
              "The value for key \"" + std::string(key_) +
              "\" should be \"All\", \"Elastic\", \"NN_to_NR\", \"NN_to_DR\","
              "\"KN_to_KN\", \"KN_to_KDelta\" or \"strangeness_exchange\","
              " or any combination of these.");
        }
      }
      return s;
    }

    operator std::set<ThermodynamicQuantity>() const {
      const std::vector<std::string> v = operator std::vector<std::string>();
      std::set<ThermodynamicQuantity> s;
      for (const auto &x : v) {
        if (x == "rho_eckart") {
          s.insert(ThermodynamicQuantity::EckartDensity);
        } else if (x == "tmn") {
          s.insert(ThermodynamicQuantity::Tmn);
        } else if (x == "tmn_landau") {
          s.insert(ThermodynamicQuantity::TmnLandau);
        } else if (x == "landau_velocity") {
          s.insert(ThermodynamicQuantity::LandauVelocity);
        } else if (x == "j_QBS") {
          s.insert(ThermodynamicQuantity::j_QBS);
        } else {
          throw IncorrectTypeInAssignment(
              "The value for key \"" + std::string(key_) +
              "\" should be \"rho_eckart\", \"tmn\""
              ", \"tmn_landau\", \"landau_velocity\" or \"j_QBS\".");
        }
      }
      return s;
    }

    operator CalculationFrame() const {
      const std::string s = operator std::string();
      if (s == "center of velocity") {
        return CalculationFrame::CenterOfVelocity;
      }
      if (s == "center of mass") {
        return CalculationFrame::CenterOfMass;
      }
      if (s == "fixed target") {
        return CalculationFrame::FixedTarget;
      }
      throw IncorrectTypeInAssignment(
          "The value for key \"" + std::string(key_) +
          "\" should be \"center of velocity\" or \"center of mass\" "
          "or \"fixed target\".");
    }

    operator FermiMotion() const {
      const std::string s = operator std::string();
      if (s == "off") {
        return FermiMotion::Off;
      }
      if (s == "on") {
        return FermiMotion::On;
      }
      if (s == "frozen") {
        return FermiMotion::Frozen;
      }
      throw IncorrectTypeInAssignment(
          "The value for key \"" + std::string(key_) +
          "\" should be \"off\" or \"on\" or \"frozen\".");
    }

    operator DensityType() const {
      const std::string s = operator std::string();
      if (s == "hadron") {
        return DensityType::Hadron;
      }
      if (s == "baryon") {
        return DensityType::Baryon;
      }
      if (s == "baryonic isospin") {
        return DensityType::BaryonicIsospin;
      }
      if (s == "pion") {
        return DensityType::Pion;
      }
      if (s == "total isospin") {
        return DensityType::Isospin3_tot;
      }
      if (s == "none") {
        return DensityType::None;
      }
      throw IncorrectTypeInAssignment("The value for key \"" +
                                      std::string(key_) +
                                      "\" should be \"hadron\" or \"baryon\" "
                                      "or \"baryonic isospin\" or \"pion\" "
                                      "or \"none\".");
    }

    operator ExpansionMode() const {
      const std::string s = operator std::string();
      if (s == "NoExpansion") {
        return ExpansionMode::NoExpansion;
      }
      if (s == "MasslessFRW") {
        return ExpansionMode::MasslessFRW;
      }
      if (s == "MassiveFRW") {
        return ExpansionMode::MassiveFRW;
      }
      if (s == "Exponential") {
        return ExpansionMode::Exponential;
      }
      throw IncorrectTypeInAssignment(
          "The value for key \"" + std::string(key_) +
          "\" should be \"NoExpansion\", \"MasslessFRW\"," +
          "\"MassiveFRW\" or \"Exponential\".");
    }

    operator TimeStepMode() const {
      const std::string s = operator std::string();
      if (s == "None") {
        return TimeStepMode::None;
      }
      if (s == "Fixed") {
        return TimeStepMode::Fixed;
      }
      throw IncorrectTypeInAssignment("The value for key \"" +
                                      std::string(key_) +
                                      "\" should be \"None\" or \"Fixed\".");
    }

    operator BoxInitialCondition() const {
      const std::string s = operator std::string();
      if (s == "thermal momenta") {
        return BoxInitialCondition::ThermalMomenta;
      }
      if (s == "peaked momenta") {
        return BoxInitialCondition::PeakedMomenta;
      }
      throw IncorrectTypeInAssignment(
          "The value for key \"" + std::string(key_) +
          "\" should be \"thermal momenta\" or \"peaked momenta\".");
    }

    operator SphereInitialCondition() const {
      const std::string s = operator std::string();
      if (s == "thermal momenta") {
        return SphereInitialCondition::ThermalMomenta;
      }
      if (s == "IC_ES") {
        return SphereInitialCondition::IC_ES;
      }
      if (s == "IC_1M") {
        return SphereInitialCondition::IC_1M;
      }
      if (s == "IC_2M") {
        return SphereInitialCondition::IC_2M;
      }
      if (s == "IC_Massive") {
        return SphereInitialCondition::IC_Massive;
      }
      throw IncorrectTypeInAssignment(
          "The value for key \"" + std::string(key_) +
          "\" should be \"thermal momenta\", \"IC_ES\", " +
          "\"IC_1M\", \"IC_2M\" or" + "\"IC_Massive\".");
    }

    operator NNbarTreatment() const {
      const std::string s = operator std::string();
      if (s == "no annihilation") {
        return NNbarTreatment::NoAnnihilation;
      }
      if (s == "resonances") {
        return NNbarTreatment::Resonances;
      }
      if (s == "strings") {
        return NNbarTreatment::Strings;
      }
      throw IncorrectTypeInAssignment(
          "The value for key \"" + std::string(key_) + "\" should be " +
          "\"no annihilation\", \"detailed balance\", or \"strings\".");
    }

    operator Sampling() const {
      const std::string s = operator std::string();
      if (s == "quadratic") {
        return Sampling::Quadratic;
      }
      if (s == "custom") {
        return Sampling::Custom;
      }
      if (s == "uniform") {
        return Sampling::Uniform;
      }
      throw IncorrectTypeInAssignment(
          "The value for key \"" + std::string(key_) +
          "\" should be \"quadratic\", \"uniform\" or \"custom\".");
    }

    operator ThermalizationAlgorithm() const {
      const std::string s = operator std::string();
      if (s == "mode sampling") {
        return ThermalizationAlgorithm::ModeSampling;
      }
      if (s == "biased BF") {
        return ThermalizationAlgorithm::BiasedBF;
      }
      if (s == "unbiased BF") {
        return ThermalizationAlgorithm::UnbiasedBF;
      }
      throw IncorrectTypeInAssignment(
          "The value for key \"" + std::string(key_) +
          "\" should be \"mode sampling\", \"biased BF\" or \"unbiased BF\".");
    }
  };

  explicit Configuration(const bf::path &path);

  explicit Configuration(const bf::path &path, const bf::path &filename);

#ifdef BUILD_TESTS

  explicit Configuration(const char *yaml) : root_node_(YAML::Load(yaml)) {}
#endif

  Configuration(const Configuration &) = default;
  Configuration &operator=(const Configuration &) = default;

  Configuration(Configuration &&) = default;
  Configuration &operator=(Configuration &&) = default;

  void merge_yaml(const std::string &yaml);

  std::vector<std::string> list_upmost_nodes();

  Value take(std::initializer_list<const char *> keys);

  template <typename T>
  T take(std::initializer_list<const char *> keys, T default_value) {
    if (has_value(keys)) {
      return take(keys);
    }
    return default_value;
  }

  Value read(std::initializer_list<const char *> keys) const;

  template <typename T>
  T read(std::initializer_list<const char *> keys, T default_value) {
    if (has_value(keys)) {
      return read(keys);
    }
    return default_value;
  }

  void remove_all_but(const std::string &key);

  template <typename T>
  Configuration operator[](T &&key) {
    return root_node_[std::forward<T>(key)];
  }

  template <typename T>
  Configuration &operator=(T &&value) {
    root_node_ = std::forward<T>(value);
    return *this;
  }

  bool has_value_including_empty(
      std::initializer_list<const char *> keys) const;
  bool has_value(std::initializer_list<const char *> keys) const;

  std::string unused_values_report() const;

  std::string to_string() const;

 private:
  Configuration(const YAML::Node &node)  // NOLINT(runtime/explicit) : see above
      : root_node_(node) {}

  YAML::Node root_node_;
};

}  // namespace smash

#endif  // SRC_INCLUDE_CONFIGURATION_H_