#ifndef QUERY_COLUMN_GENERATOR_HPP
#define QUERY_COLUMN_GENERATOR_HPP

#include "matador/sql/column.hpp"
#include "matador/sql/types.hpp"

#include "matador/utils/access.hpp"
#include "matador/utils/field_attributes.hpp"
#include "matador/utils/identifiable.hpp"
#include "matador/utils/identifier.hpp"

#include <vector>

namespace matador::utils {
enum class cascade_type;
}

namespace matador::sql {

namespace detail {
class null_identifiable : public utils::identifiable
{
public:
  void reset(const utils::identifier &) override {};
  [[nodiscard]] bool has_primary_key() const override { return false; }
  [[nodiscard]] const utils::identifier& primary_key() const override { return id_; }
  utils::identifier& primary_key() override { return id_; }
  [[nodiscard]] utils::identifier create_identifier() const override { return utils::identifier(id_); }

private:
  utils::identifier id_;
};

static null_identifiable null_id;

}

class fk_column_generator : public utils::identifier_serializer
{
public:
  column generate(const char *id, utils::identifiable &x);
  void serialize(short &i, const utils::field_attributes &attributes) override;
  void serialize(int &i, const utils::field_attributes &attributes) override;
  void serialize(long &i, const utils::field_attributes &attributes) override;
  void serialize(long long int &i, const utils::field_attributes &attributes) override;
  void serialize(unsigned short &i, const utils::field_attributes &attributes) override;
  void serialize(unsigned int &i, const utils::field_attributes &attributes) override;
  void serialize(unsigned long &i, const utils::field_attributes &attributes) override;
  void serialize(unsigned long long int &i, const utils::field_attributes &attributes) override;
  void serialize(std::string &string, const utils::field_attributes &attributes) override;
  void serialize(utils::null_type_t &type, const utils::field_attributes &attributes) override;

private:
  utils::identifiable &identifiable_{detail::null_id};
  const char *id_{};
  column column_;
};

class column_generator
{
private:
  explicit column_generator(std::vector<column> &columns);

public:
  ~column_generator() = default;

  template < class Type >
  static std::vector<column> generate()
  {
    std::vector<column> columns;
    column_generator gen(columns);
    Type obj;
    matador::utils::access::process(gen, obj);
    return std::move(columns);
  }

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

  template<typename Type>
  void on_attribute(const char *id, Type &x, const utils::field_attributes &attr = utils::null_attributes);

  void on_belongs_to(const char *id, utils::identifiable &x, utils::cascade_type);
  void on_has_one(const char *id, utils::identifiable &x, utils::cascade_type);
  template<class ContainerType>
  void on_has_many(const char *, ContainerType &, const char *, const char *, utils::cascade_type) {}
  template<class ContainerType>
  void on_has_many(const char *, ContainerType &, utils::cascade_type) {}

private:
  size_t index_ = 0;
  std::vector<column> &columns_;

  fk_column_generator fk_column_generator_;
};

template<typename V>
void column_generator::on_primary_key(const char *id, V &x, typename std::enable_if<std::is_integral<V>::value && !std::is_same<bool, V>::value>::type*)
{
  on_attribute(id, x, { utils::constraints::PRIMARY_KEY });
}

template<typename Type>
void column_generator::on_attribute(const char *id, Type &x, const utils::field_attributes &attr)
{
  columns_.emplace_back(id, x, attr);
}

}
#endif //QUERY_COLUMN_GENERATOR_HPP