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/// @file
/// @brief
/// Error handling constructs similar to std::error_code, std::error_condition,
/// and std::error_category.

#ifndef MaximInterface_system_error
#define MaximInterface_system_error

#include <stdexcept>
#include <string>
#include "Export.h"
#include "SafeBool.hpp"
#include "Uncopyable.hpp"

namespace MaximInterface {

class error_condition;
class error_code;

class error_category : private Uncopyable {
public:
  virtual ~error_category() {}

  virtual const char * name() const = 0;
  
  MaximInterface_EXPORT virtual error_condition
  default_error_condition(int code) const;
  
  MaximInterface_EXPORT virtual bool
  equivalent(int code, const error_condition & condition) const;
  
  MaximInterface_EXPORT virtual bool equivalent(const error_code & code,
                                                int condition) const;
  
  virtual std::string message(int condition) const = 0;
};

inline bool operator==(const error_category & lhs, const error_category & rhs) {
  return &lhs == &rhs;
}

inline bool operator!=(const error_category & lhs, const error_category & rhs) {
  return !operator==(lhs, rhs);
}

inline bool operator<(const error_category & lhs, const error_category & rhs) {
  return &lhs < &rhs;
}

MaximInterface_EXPORT const error_category & system_category();

class error_condition {
public:
  error_condition() : value_(0), category_(&system_category()) {}
  
  error_condition(int value, const error_category & category)
      : value_(value), category_(&category) {}

  void assign(int value, const error_category & category) {
    value_ = value;
    category_ = &category;
  }
  
  void clear() {
    value_ = 0;
    category_ = &system_category();
  }
  
  int value() const { return value_; }
  
  const error_category & category() const { return *category_; }
  
  std::string message() const { return category().message(value()); }
  
  operator SafeBool() const { return makeSafeBool(value() != 0); }

private:
  int value_;
  const error_category * category_;
};

inline bool operator==(const error_condition & lhs,
                       const error_condition & rhs) {
  return (lhs.value() == rhs.value()) && (lhs.category() == rhs.category());
}

inline bool operator!=(const error_condition & lhs,
                       const error_condition & rhs) {
  return !operator==(lhs, rhs);
}

inline bool operator<(const error_condition & lhs,
                      const error_condition & rhs) {
  return (lhs.category() < rhs.category()) ||
         ((lhs.category() == rhs.category()) && (lhs.value() < rhs.value()));
}

class error_code {
public:
  error_code() : value_(0), category_(&system_category()) {}
  
  error_code(int value, const error_category & category)
      : value_(value), category_(&category) {}

  void assign(int value, const error_category & category) {
    value_ = value;
    category_ = &category;
  }
  
  void clear() {
    value_ = 0;
    category_ = &system_category();
  }
  
  int value() const { return value_; }
  
  const error_category & category() const { return *category_; }
  
  error_condition default_error_condition() const {
    return category().default_error_condition(value());
  }
  
  std::string message() const { return category().message(value()); }
  
  operator SafeBool() const { return makeSafeBool(value() != 0); }

private:
  int value_;
  const error_category * category_;
};

inline bool operator==(const error_code & lhs, const error_code & rhs) {
  return (lhs.value() == rhs.value()) && (lhs.category() == rhs.category());
}

inline bool operator!=(const error_code & lhs, const error_code & rhs) {
  return !operator==(lhs, rhs);
}

inline bool operator<(const error_code & lhs, const error_code & rhs) {
  return (lhs.category() < rhs.category()) ||
         ((lhs.category() == rhs.category()) && (lhs.value() < rhs.value()));
}

template <typename CharT, typename Traits>
std::basic_ostream<CharT, Traits> &
operator<<(std::basic_ostream<CharT, Traits> & os, const error_code & ec) {
  os << ec.category().name() << ':' << ec.value();
  return os;
}

inline bool operator==(const error_code & lhs, const error_condition & rhs) {
  return lhs.category().equivalent(lhs.value(), rhs) ||
         rhs.category().equivalent(lhs, rhs.value());
}

inline bool operator!=(const error_code & lhs, const error_condition & rhs) {
  return !operator==(lhs, rhs);
}

inline bool operator==(const error_condition & lhs, const error_code & rhs) {
  return operator==(rhs, lhs);
}

inline bool operator!=(const error_condition & lhs, const error_code & rhs) {
  return !operator==(lhs, rhs);
}

class system_error : public std::runtime_error {
public:
  MaximInterface_EXPORT system_error(const error_code & ec);
  
  MaximInterface_EXPORT system_error(const error_code & ec,
                                     const std::string & what_arg);
                                     
  MaximInterface_EXPORT system_error(const error_code & ec,
                                     const char * what_arg);
                                     
  MaximInterface_EXPORT system_error(int ev, const error_category & ecat);
  
  MaximInterface_EXPORT system_error(int ev, const error_category & ecat,
                                     const std::string & what_arg);
                                     
  MaximInterface_EXPORT system_error(int ev, const error_category & ecat,
                                     const char * what_arg);

  const error_code & code() const { return code_; }

private:
  error_code code_;
};

} // namespace MaximInterface

#endif