#ifndef QUERY_FIELD_HPP
#define QUERY_FIELD_HPP

#include "matador/sql/any_type.hpp"
#include "matador/sql/any_type_to_visitor.hpp"
#include "matador/sql/data_type_traits.hpp"

#include "matador/utils/types.hpp"

#include <optional>
#include <string>

namespace matador::sql {

class field
{
public:
  explicit field(std::string name);
  template<typename Type>
  field(std::string name, Type value, size_t size = 0, int index = -1)
  : name_(std::move(name))
  , size_(size)
  , index_(index)
  , value_(value)
  , type_(data_type_traits<Type>::builtin_type(size)) {}
  field(std::string name, data_type_t data_type, size_t size = 0, int index = -1);
  field(const field &x) = default;
  field& operator=(const field &x) = default;
  field(field &&x) noexcept;
  field& operator=(field &&x) noexcept;

  template<typename Type>
  field& operator=(Type value) {
    value_ = std::move(value);
    type_ = data_type_traits<Type>::builtin_type(-1);
    return *this;
  }

  [[nodiscard]] const std::string& name() const;
  [[nodiscard]] size_t size() const;
  [[nodiscard]] int index() const;

  template<class Type>
  std::optional<Type> as() const
  {
    any_type_to_visitor<Type> visitor;
    std::visit(visitor, const_cast<any_type&>(value_));
    return visitor.result;
  }

  [[nodiscard]] std::string str() const;

  [[nodiscard]] bool is_integer() const;
  [[nodiscard]] bool is_floating_point() const;
  [[nodiscard]] bool is_bool() const;
  [[nodiscard]] bool is_string() const;
  [[nodiscard]] bool is_varchar() const;
  [[nodiscard]] bool is_blob() const;
  [[nodiscard]] bool is_null() const;
  [[nodiscard]] bool is_unknown() const;

  friend std::ostream& operator<<(std::ostream &out, const field &col);

private:
  template<class Operator>
  void process(Operator &op)
  {
    op.on_attribute(name_.c_str(), value_, type_, size_);
  }

private:
  friend class record;

  std::string name_;
  int index_{-1};
  any_type value_;
  size_t size_{};
  data_type_t type_;
};

}
#endif //QUERY_FIELD_HPP