query/include/matador/sql/query_intermediates.hpp

#ifndef QUERY_QUERY_INTERMEDIATES_HPP
#define QUERY_QUERY_INTERMEDIATES_HPP

#include "matador/sql/column_definition.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_result.hpp"
#include "matador/sql/query_data.hpp"
#include "matador/sql/record.hpp"
#include "matador/sql/statement.hpp"
#include "matador/sql/schema.hpp"
#include "matador/sql/value_extractor.hpp"

#include <string>

namespace matador::sql {

class basic_condition;
class connection;

class basic_query_intermediate
{
public:
  explicit basic_query_intermediate(connection &db, const std::shared_ptr<sql::schema> &schema);

protected:
  connection &connection_;
  std::shared_ptr<sql::schema> schema_;
};

class query_intermediate : public basic_query_intermediate
{
public:
  query_intermediate(connection &db, const std::shared_ptr<sql::schema> &schema, query_data &data);

protected:
  query_data &data_;
};

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

  size_t execute();
  statement prepare();
  [[nodiscard]] std::string str() const;
};

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();

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

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

class query_offset_intermediate;

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

  query_offset_intermediate offset(size_t offset);
};

class query_offset_intermediate : public query_select_finish
{
public:
  using query_select_finish::query_select_finish;

  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_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 column &col);
};

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 column &col);
  query_order_by_intermediate order_by(const column &col);
};

class query_join_intermediate;

class query_on_intermediate : public query_select_finish
{
public:
  using query_select_finish::query_select_finish;

  query_join_intermediate join_left(const table &t);
  template<class Condition>
  query_where_intermediate where(const Condition &cond)
  {
    data_.parts.push_back(std::make_unique<query_where_part>(cond));
    return {connection_, schema_, data_};
  }
  query_group_by_intermediate group_by(const column &col);
  query_order_by_intermediate order_by(const column &col);
};

class query_join_intermediate : public query_intermediate
{
public:
  using query_intermediate::query_intermediate;

  template<class Condition>
  query_on_intermediate on(const Condition &cond)
  {
    data_.parts.push_back(std::make_unique<query_on_part>(cond));
    return {connection_, schema_, data_};
  }
};

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

  query_join_intermediate join_left(const table &t);
  template<class Condition>
  query_where_intermediate where(const Condition &cond)
  {
    data_.parts.push_back(std::make_unique<query_where_part>(cond));
    return {connection_, schema_, data_};
  }
  query_group_by_intermediate group_by(const column &col);
  query_order_by_intermediate order_by(const column &col);
};

class query_start_intermediate : public basic_query_intermediate
{
public:
  explicit query_start_intermediate(connection &db, const std::shared_ptr<sql::schema> &schema);

protected:
  query_data data_;
};

class query_select_intermediate : public query_start_intermediate
{
public:
  query_select_intermediate(connection &db, const std::shared_ptr<sql::schema> &schema, const std::vector<column>& columns);

  query_from_intermediate from(const table& t);
};

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);
  query_execute_finish values(const std::vector<any_type>& values);
  template<class Type>
  query_execute_finish values()
  {
    Type obj;
    data_.parts.push_back(std::make_unique<query_values_part>(as_placeholder(obj)));
    return {connection_, schema_, data_};
  }
  template<class Type>
  query_execute_finish values(const Type &obj)
  {
    data_.parts.push_back(std::make_unique<query_values_part>(value_extractor::extract(obj)));
    return {connection_, schema_, data_};
  }
};

class query_create_intermediate : public query_start_intermediate
{
public:
  explicit query_create_intermediate(connection &db, const std::shared_ptr<sql::schema> &schema);

  query_execute_finish table(const sql::table &table, std::initializer_list<column_definition> columns);
  query_execute_finish table(const sql::table &table, const std::vector<column_definition> &columns);
  template<class Type>
  query_execute_finish table(const sql::table &table)
  {
    if (!schema_->exists<Type>()) {
      schema_->attach<Type>(table.name);
    }
    data_.parts.push_back(std::make_unique<query_create_table_part>(table, column_generator::generate<Type>(*schema_)));
    return {connection_, schema_, data_};
  }
};

class query_drop_intermediate : query_start_intermediate
{
public:
  explicit query_drop_intermediate(connection &db, const std::shared_ptr<sql::schema> &schema);

  query_execute_finish table(const sql::table &table);
};

class query_insert_intermediate : public query_start_intermediate
{
public:
  explicit query_insert_intermediate(connection &db, const std::shared_ptr<sql::schema> &schema);

  query_into_intermediate into(const sql::table &table, std::initializer_list<column> column_names);
  template<class Type>
  query_into_intermediate into(const sql::table &table)
  {;
    data_.parts.push_back(std::make_unique<query_into_part>(table, column_name_generator::generate<Type>(*schema_)));
    return {connection_, schema_, data_};
  }
};

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;

  template<class Condition>
  query_execute_where_intermediate where(const Condition &cond)
  {
    data_.parts.push_back(std::make_unique<query_where_part>(cond));
    return {connection_, schema_, data_};
  }
};

class query_update_intermediate : public query_start_intermediate
{
public:
  query_update_intermediate(connection &db, const std::shared_ptr<sql::schema> &schema, const sql::table& table);

  query_set_intermediate set(std::initializer_list<key_value_pair> columns);
  template<class Type>
  query_set_intermediate set(const Type &obj)
  {
    data_.parts.push_back(std::make_unique<query_set_part>(key_value_generator::generate(obj)));
    return {connection_, schema_, data_};
  }
};

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

  template<class Condition>
  query_execute_where_intermediate where(const Condition &cond)
  {
    data_.parts.push_back(std::make_unique<query_where_part>(cond));
    return {connection_, schema_, data_};
  }
};

class query_delete_intermediate : public query_start_intermediate
{
public:
  explicit query_delete_intermediate(connection &db, const std::shared_ptr<sql::schema> &schema);

  query_delete_from_intermediate from(const sql::table &table);
};

}
#endif //QUERY_QUERY_INTERMEDIATES_HPP