#ifndef QUERY_QUERY_RESULT_IMPL_HPP
#define QUERY_QUERY_RESULT_IMPL_HPP

#include "matador/utils/access.hpp"
#include "matador/utils/field_attributes.hpp"
#include "matador/utils/foreign_attributes.hpp"

#include "matador/sql/any_type.hpp"
#include "matador/sql/query_result_reader.hpp"
#include "matador/sql/column_definition.hpp"
#include "matador/sql/data_type_traits.hpp"

#include <memory>
#include <string>

namespace matador::sql {

namespace detail {
class pk_reader
{
public:
  explicit pk_reader(query_result_reader &reader);

  template<class Type>
  void read(Type &obj, size_t column_index)
  {
    column_index_ = column_index;
    utils::access::process(*this, obj);
  }

  template<typename ValueType>
  void on_primary_key(const char *id, ValueType &value, typename std::enable_if<std::is_integral<ValueType>::value && !std::is_same<bool, ValueType>::value>::type* = 0);
  void on_primary_key(const char *id, std::string &value, size_t size);
  void on_revision(const char * /*id*/, unsigned long long &/*rev*/) {}

  template < class Type >
  void on_attribute(const char * /*id*/, Type &/*x*/, const utils::field_attributes &/*attr*/ = utils::null_attributes) {}
  template < class Pointer >
  void on_belongs_to(const char * /*id*/, Pointer &/*x*/, const utils::foreign_attributes &/*attr*/) {}
  template < class Pointer >
  void on_has_one(const char * /*id*/, Pointer &/*x*/, const utils::foreign_attributes &/*attr*/) {}

  template<class ContainerType>
  void on_has_many(const char *, ContainerType &, const char *, const char *, const utils::foreign_attributes &/*attr*/) {}
  template<class ContainerType>
  void on_has_many(const char *, ContainerType &, const utils::foreign_attributes &/*attr*/) {}

private:
  size_t column_index_{};
  query_result_reader &reader_;
};

}

class query_result_impl
{
public:
  query_result_impl(std::unique_ptr<query_result_reader> &&reader, std::vector<column_definition> prototype);

  template<typename ValueType>
  void on_primary_key(const char *id, ValueType &value, typename std::enable_if<std::is_integral<ValueType>::value && !std::is_same<bool, ValueType>::value>::type* = 0)
  {
    data_type_traits<ValueType>::read_value(*reader_, id, column_index_++, value);
  }
  void on_primary_key(const char *id, std::string &value, size_t size);
  void on_revision(const char *id, unsigned long long &rev);

  template < class Type >
  void on_attribute(const char *id, Type &x, const utils::field_attributes &/*attr*/ = utils::null_attributes)
  {
    data_type_traits<Type>::read_value(*reader_, id, column_index_++, x);
  }
  void on_attribute(const char *id, char *value, const utils::field_attributes &attr = utils::null_attributes);
  void on_attribute(const char *id, std::string &value, const utils::field_attributes &attr = utils::null_attributes);
  void on_attribute(const char *id, any_type &value, data_type_t type, const utils::field_attributes &attr = utils::null_attributes);
//  void on_attribute(const char *id, any_type &value, data_type_t type, const utils::field_attributes &attr = utils::null_attributes);

  template < class Pointer >
  void on_belongs_to(const char * /*id*/, Pointer &x, const utils::foreign_attributes &/*attr*/)
  {
    if (!x.get()) {
      x.reset(new typename Pointer::value_type);
    }
    pk_reader_.read(*x, column_index_++);
  }
  template < class Pointer >
  void on_has_one(const char * /*id*/, Pointer &x, const utils::foreign_attributes &/*attr*/)
  {
    if (!x.get()) {
      x.reset(new typename Pointer::value_type);
    }
    pk_reader_.read(*x, column_index_++);
  }

  template<class ContainerType>
  void on_has_many(const char *, ContainerType &, const char *, const char *, const utils::foreign_attributes &/*attr*/) {}
  template<class ContainerType>
  void on_has_many(const char *, ContainerType &, const utils::foreign_attributes &/*attr*/) {}

  template<class Type>
  void bind(const Type &) {}

  template<class Type>
  bool fetch(Type &obj)
  {
    column_index_ = 0;
    if (!reader_->fetch()) {
      return false;
    }
    matador::utils::access::process(*this, obj);
    return true;
  }

  [[nodiscard]] const std::vector<column_definition>& prototype() const;

protected:
  size_t column_index_ = 0;
  std::vector<column_definition> prototype_;
  std::unique_ptr<query_result_reader> reader_;
  detail::pk_reader pk_reader_;
};

namespace detail {

template<typename ValueType>
void detail::pk_reader::on_primary_key(const char *id, ValueType &value, typename std::enable_if<std::is_integral<ValueType>::value && !std::is_same<bool, ValueType>::value>::type *)
{
  data_type_traits<ValueType>::read_value(reader_, id, column_index_++, value);
}

}
}

#endif //QUERY_QUERY_RESULT_IMPL_HPP