calendar-daemon/db/statements/builder/StatementBuilder.h

#pragma once

#include "Statement.h"
#include <string>
#include <vector>

namespace db {
  namespace statements {
    namespace builder {
      class InsertStatementBuilder;

      class AbstractStatementBuilder {
      protected:
        Statement &m_statement;
        explicit AbstractStatementBuilder(Statement &statement) : m_statement(statement) {}
      public:
        operator Statement() const {
          return std::move(m_statement);
        }
      };

      class StatementBuilder : public AbstractStatementBuilder {
      public:
        Statement m_statement;
        StatementBuilder() : AbstractStatementBuilder{m_statement} {
        }
      };

      class InsertStatementBuilder : public StatementBuilder {
      public:
        explicit InsertStatementBuilder() : StatementBuilder() {
        }

        InsertStatementBuilder &table(const std::string &table) {
          m_statement.body += "INSERT INTO " + table + " ";
          return *this;
        }

        InsertStatementBuilder &columns(const std::string &cols) {
          m_statement.body += "(" + cols + ")\n";
          return *this;
        }

        InsertStatementBuilder &values() {
          m_statement.body += " VALUES ";
          return *this;
        }

        InsertStatementBuilder &row(const std::string &values) {
          m_statement.body += " (" + values + "),\n";
          return *this;
        }

        InsertStatementBuilder &row(const std::vector<std::string> &values) {
          m_statement.body += " (";
          bool first = true;
          for(auto const& v : values) {
            if(first) { first = false; } else { m_statement.body += ","; }
            m_statement.body += v;
          }
          m_statement.body += "),\n";
          return *this;
        }

        InsertStatementBuilder &close() {
          m_statement.body.pop_back();
          m_statement.body.pop_back();
          m_statement.body += ";\n";
          return *this;
        }
      };
    }
  }
}