query/include/matador/sql/query_intermediates.hpp

#ifndef QUERY_QUERY_INTERMEDIATES_HPP
#define QUERY_QUERY_INTERMEDIATES_HPP

#include "matador/sql/column.hpp"
#include "matador/sql/column_generator.hpp"
#include "matador/sql/column_name_generator.hpp"
#include "matador/sql/key_value_generator.hpp"
#include "matador/sql/key_value_pair.hpp"
#include "matador/sql/placeholder_generator.hpp"
#include "matador/sql/query_builder.hpp"
#include "matador/sql/query_result.hpp"
#include "matador/sql/record.hpp"
#include "matador/sql/statement.hpp"
#include "matador/sql/table_repository.hpp"
#include "matador/sql/value_extractor.hpp"

#include <string>

namespace matador::sql {

class basic_condition;
class session;

class query_intermediate
{
public:
  query_intermediate(session &db, query_builder &query);

protected:
  session &session_;
  query_builder &builder_;
};

class query_execute_finish : public query_intermediate
{
public:
  using query_intermediate::query_intermediate;

  size_t execute();
  statement prepare();
};

class query_select_finish : public query_intermediate
{
protected:
  using query_intermediate::query_intermediate;

public:
  template < class Type >
  query_result<Type> fetch_all()
  {
    return query_result<Type>(fetch());
  }

  query_result<record> fetch_all();
  record fetch_one();
  template<typename Type>
  Type fetch_value()
  {
    return fetch_one().at(0).as<Type>();
  }

  statement prepare();

private:
  std::unique_ptr<query_result_impl> fetch();
};

class query_limit_intermediate : public query_select_finish
{
public:
  using query_select_finish::query_select_finish;
};

class query_offset_intermediate : public query_intermediate
{
public:
  using query_intermediate::query_intermediate;

  query_limit_intermediate limit(size_t limit);
};

class query_order_direction_intermediate : public query_select_finish
{
public:
  using query_select_finish::query_select_finish;

  query_offset_intermediate offset(size_t offset);
  query_limit_intermediate limit(size_t limit);
};

class query_order_by_intermediate;

class query_group_by_intermediate : public query_select_finish
{
public:
  using query_select_finish::query_select_finish;

  query_order_by_intermediate order_by(const std::string &name);
};

class query_order_by_intermediate : public query_intermediate
{
public:
  using query_intermediate::query_intermediate;

  query_order_direction_intermediate asc();
  query_order_direction_intermediate desc();
};

class query_where_intermediate : public query_select_finish
{
public:
  using query_select_finish::query_select_finish;

  query_group_by_intermediate group_by(const std::string &name);
  query_order_by_intermediate order_by(const std::string &name);
};

class query_from_intermediate : public query_select_finish
{
public:
  using query_select_finish::query_select_finish;

  query_where_intermediate where(const basic_condition &cond);
  query_group_by_intermediate group_by(const std::string &name);
  query_order_by_intermediate order_by(const std::string &name);
};

class query_start_intermediate
{
public:
  explicit query_start_intermediate(session &s);

protected:
  session &session_;
  query_builder builder_;
};

class query_select_intermediate : public query_start_intermediate
{
public:
  query_select_intermediate(session &s, const std::vector<column>& columns);

  query_from_intermediate from(const std::string &table, const std::string &as = "");
};

template < class Type >
std::vector<any_type> as_placeholder(const Type &obj)
{
  placeholder_generator generator;
  matador::utils::access::process(generator, obj);

  return generator.placeholder_values;
}

class query_into_intermediate : public query_intermediate
{
public:
  using query_intermediate::query_intermediate;

  query_execute_finish values(std::initializer_list<any_type> values);
  template<class Type>
  query_execute_finish values()
  {
    Type obj;
    return {session_, builder_.values(as_placeholder(obj))};
  }
  template<class Type>
  query_execute_finish values(const Type &obj)
  {
    return {session_, builder_.values(value_extractor::extract(obj))};
  }
};

class query_create_intermediate : query_start_intermediate
{
public:
  query_create_intermediate(session &s, table_repository &repo);

  query_execute_finish table(const std::string &table, std::initializer_list<column> columns);
  template<class Type>
  query_execute_finish table(const std::string &table_name)
  {
    const auto &info = repository_.attach<Type>(table_name);
    return {session_, builder_.table(table_name, info.prototype.columns())};
  }

private:
  table_repository &repository_;
};

class query_drop_intermediate : query_start_intermediate
{
public:
  explicit query_drop_intermediate(session &s);

  query_execute_finish table(const std::string &table);
};

class query_insert_intermediate : public query_start_intermediate
{
public:
  explicit query_insert_intermediate(session &s);

  query_into_intermediate into(const std::string &table, std::initializer_list<std::string> column_names);
  template<class Type>
  query_into_intermediate into(const std::string &table)
  {
    return {session_, builder_.into(table, column_name_generator::generate<Type>())};
  }
  template<class Type>
  query_execute_finish into(const std::string &table, const Type &obj)
  {
    return {session_, builder_.into(table, column_name_generator::generate<Type>())
                         .values(value_extractor::extract(obj))};
  }
};

class query_execute_where_intermediate : public query_execute_finish
{
public:
  using query_execute_finish::query_execute_finish;

  query_execute_finish limit(int limit);
};

class query_set_intermediate : public query_execute_finish
{
public:
  using query_execute_finish::query_execute_finish;

  query_execute_where_intermediate where(const basic_condition &cond);
};

class query_update_intermediate : public query_start_intermediate
{
public:
  query_update_intermediate(session &s, const std::string& table_name);

  query_set_intermediate set(std::initializer_list<key_value_pair> columns);
  template<class Type>
  query_set_intermediate set(const Type &obj)
  {
    return {session_, builder_.set(key_value_generator::generate(obj))};
  }
};

class query_delete_from_intermediate : public query_execute_finish
{
public:
  using query_execute_finish::query_execute_finish;

  query_execute_where_intermediate where(const basic_condition &cond);
};

class query_delete_intermediate : public query_start_intermediate
{
public:
  explicit query_delete_intermediate(session &s);

  query_delete_from_intermediate from(const std::string &table);
};

}
#endif //QUERY_QUERY_INTERMEDIATES_HPP