SET sql_log_bin=0;
use billing;

delimiter ;;
drop function get_billing_fee_id;;
create function get_billing_fee_id(
  _billing_profile_id int(11),
  _type enum('call','sms'),
  _direction enum('in','out'),
  _source varchar(511),
  _destination varchar(511),
  _match_mode enum('regex_longest_pattern', 'regex_longest_match', 'prefix', 'exact_destination')
) returns int(11)
deterministic reads sql data
begin

  declare _destination_prefix,_source_prefix varchar(511);
  declare _i, _j int(3);
  declare _fee_id int(11);

  if _fee_id is null and (_match_mode is null or _match_mode = "exact_destination")
     and (select id from billing.billing_fees_history where
          billing_profile_id = _billing_profile_id
      and type = _type
      and match_mode = "exact_destination"
      and direction = _direction
      and bf_id is not null
    limit 1) is not null then

    set _fee_id = (select id from billing.billing_fees_history where
          billing_profile_id = _billing_profile_id
        and type = _type
        and match_mode = "exact_destination"
        and direction = _direction
        and bf_id is not null
        and destination = _destination
      limit 1);

  end if;

  if _fee_id is null and (_match_mode is null or _match_mode = "prefix")
     and (select id from billing.billing_fees_history where
          billing_profile_id = _billing_profile_id
      and type = _type
      and match_mode = "prefix"
      and direction = _direction
      and bf_id is not null
    limit 1) is not null then

    set _j = length(_destination);

    destination_loop: loop
      if _j < 0 or _fee_id is not null then
        leave destination_loop;
      end if;
      set _destination_prefix = substr(coalesce(_destination,""),1,_j);
      if (select id from billing.billing_fees_history where
              billing_profile_id = _billing_profile_id
          and type = _type
          and match_mode = "prefix"
          and direction = _direction
          and bf_id is not null
          and destination = _destination_prefix
        limit 1) is not null then

        set _i = length(_source);

        source_loop: loop
          if _i < 0 or _fee_id is not null then
            leave source_loop;
          end if;
          set _source_prefix = substr(coalesce(_source,""),1,_i);
          set _fee_id = (select id from billing.billing_fees_history where
                  billing_profile_id = _billing_profile_id
              and type = _type
              and match_mode = "prefix"
              and direction = _direction
              and bf_id is not null
              and source = _source_prefix
              and destination = _destination_prefix
            limit 1);
          set _i = _i - 1;
        end loop source_loop;
      end if;
      set _j = _j - 1;
    end loop destination_loop;
  end if;

  if _fee_id is null and (_match_mode is null or _match_mode = "regex_longest_match")
     and (select id from billing.billing_fees_history where
          billing_profile_id = _billing_profile_id
      and type = _type
      and match_mode = "regex_longest_match"
      and direction = _direction
      and bf_id is not null
    limit 1) is not null then

    set _fee_id = (select id from billing.billing_fees_history where
            billing_profile_id = _billing_profile_id
        and type = _type
        and match_mode = "regex_longest_match"
        and direction = _direction
        and bf_id is not null
        and _source regexp(source)
        and _destination regexp(destination)
      order by
        length(regexp_substr(_destination,destination)) desc,
        length(regexp_substr(_source,source)) desc limit 1);

  end if;

  if _fee_id is null and (_match_mode is null or _match_mode = "regex_longest_pattern")
     and (select id from billing.billing_fees_history where
          billing_profile_id = _billing_profile_id
      and type = _type
      and match_mode = "regex_longest_pattern"
      and direction = _direction
      and bf_id is not null
    limit 1) is not null then

    set _fee_id = (select id from billing.billing_fees_history where
            billing_profile_id = _billing_profile_id
        and type = _type
        and match_mode = "regex_longest_pattern"
        and direction = _direction
        and bf_id is not null
        and _source regexp(source)
        and _destination regexp(destination)
      order by
        length(destination) desc,
        length(source) desc limit 1);

  end if;

  return _fee_id;

end;;

delimiter ;