#ifndef QUERY_POSTGRES_RESULT_READER_HPP
#define QUERY_POSTGRES_RESULT_READER_HPP

#include "matador/sql/interface/query_result_reader.hpp"

#include <libpq-fe.h>

namespace matador::backends::postgres {

namespace detail {

class empty_binder final : public utils::attribute_reader
{
public:
  void read_value(const char *, size_t, int8_t &) override {}
  void read_value(const char *, size_t, int16_t &) override {}
  void read_value(const char *, size_t, int32_t &) override {}
  void read_value(const char *, size_t, int64_t &) override {}
  void read_value(const char *, size_t, uint8_t &) override {}
  void read_value(const char *, size_t, uint16_t &) override {}
  void read_value(const char *, size_t, uint32_t &) override {}
  void read_value(const char *, size_t, uint64_t &) override {}
  void read_value(const char *, size_t, bool &) override {}
  void read_value(const char *, size_t, float &) override {}
  void read_value(const char *, size_t, double &) override {}
  void read_value(const char *, size_t, time &) override {}
  void read_value(const char *, size_t, date &) override {}
  void read_value(const char *, size_t, char *, size_t) override {}
  void read_value(const char *, size_t, std::string &) override {}
  void read_value(const char *, size_t, std::string &, size_t) override {}
  void read_value(const char *, size_t, utils::blob &) override {}
  void read_value(const char *, size_t, utils::value &, size_t) override {}
};

}

class postgres_result_reader final : public sql::query_result_reader
{
public:
  explicit postgres_result_reader(PGresult *result);
  ~postgres_result_reader() override;

  [[nodiscard]] size_t column_count() const override;
  [[nodiscard]] const char *column(size_t index) const override;
  utils::result<bool, utils::error> fetch() override;
  [[nodiscard]] size_t start_column_index() const override;

  void read_value(const char *id, size_t index, int8_t &value) override;
  void read_value(const char *id, size_t index, int16_t &value) override;
  void read_value(const char *id, size_t index, int32_t &value) override;
  void read_value(const char *id, size_t index, int64_t &value) override;
  void read_value(const char *id, size_t index, uint8_t &value) override;
  void read_value(const char *id, size_t index, uint16_t &value) override;
  void read_value(const char *id, size_t index, uint32_t &value) override;
  void read_value(const char *id, size_t index, uint64_t &value) override;
  void read_value(const char *id, size_t index, bool &value) override;
  void read_value(const char *id, size_t index, float &value) override;
  void read_value(const char *id, size_t index, double &value) override;
  void read_value(const char *id, size_t index, matador::time &value) override;
  void read_value(const char *id, size_t index, matador::date &value) override;
  void read_value(const char *id, size_t index, char *value, size_t size) override;
  void read_value(const char *id, size_t index, std::string &value) override;
  void read_value(const char *id, size_t index, std::string &value, size_t size) override;
  void read_value(const char *id, size_t index, utils::blob &value) override;
  void read_value(const char *id, size_t index, utils::value &val, size_t size) override;

protected:
  attribute_reader &result_binder() override;

private:
  PGresult *result_{};

  size_t row_count_{};
  size_t column_count_{};
  int row_index_{-1};

  detail::empty_binder empty_binder_;
};

}

#endif //QUERY_POSTGRES_RESULT_READER_HPP