#ifndef QUERY_VALUE_EXTRACTOR_HPP
#define QUERY_VALUE_EXTRACTOR_HPP

#include "matador/sql/fk_value_extractor.hpp"
#include "matador/sql/data_type_traits.hpp"

#include "matador/utils/foreign_attributes.hpp"

#include <vector>

namespace matador::sql {

class value_extractor
{
private:
  explicit value_extractor(std::vector<any_type> &values);

public:
  ~value_extractor() = default;

  template < class Type >
  static std::vector<any_type> extract(const Type &type)
  {
    std::vector<any_type> values;
    value_extractor gen(values);
    matador::utils::access::process(gen, type);
    return std::move(values);
  }

  template<typename ValueType>
  void on_primary_key(const char *, ValueType &x, typename std::enable_if<std::is_integral<ValueType>::value && !std::is_same<bool, ValueType>::value>::type* = 0)
  {
    append(x);
  }
  void on_primary_key(const char *id, std::string &pk, size_t size);
  void on_revision(const char *id, unsigned long long &rev);
  template < class Type >
  void on_attribute(const char *, Type &x, const utils::field_attributes &/*attr*/ = utils::null_attributes)
  {
    append(x);
  }
  void on_attribute(const char *id, char *x, const utils::field_attributes &/*attr*/ = utils::null_attributes);
  void on_attribute(const char *id, std::string &x, const utils::field_attributes &/*attr*/ = utils::null_attributes);

  template<class Type, template < class ... > class Pointer>
  void on_belongs_to(const char * /*id*/, Pointer<Type> &x, const utils::foreign_attributes &/*attr*/)
  {
    values_.emplace_back(fk_value_extractor_.extract(*x));
  }
  template<class Type, template < class ... > class Pointer>
  void on_has_one(const char * /*id*/, Pointer<Type> &x, const utils::foreign_attributes &/*attr*/)
  {
    values_.emplace_back(fk_value_extractor_.extract(*x));
  }
  template<class ContainerType>
  void on_has_many(ContainerType &, const char *, const utils::foreign_attributes &/*attr*/) {}
  template<class ContainerType>
  void on_has_many_to_many(const char *id, ContainerType &c, const char *join_column, const char *inverse_join_column, const utils::foreign_attributes &/*attr*/) {}
  template<class ContainerType>
  void on_has_many_to_many(const char *id, ContainerType &c, const utils::foreign_attributes &/*attr*/) {}

private:
  template<typename Type>
  void append(Type &value)
  {
    values_.emplace_back(data_type_traits<Type>::create_value(value));
  }

private:
  detail::fk_value_extractor fk_value_extractor_;
  std::vector<any_type> &values_;
};

}

#endif //QUERY_VALUE_EXTRACTOR_HPP