# 1. This test case is sensitive to execution timing.  You may control
#    this sensitivity by the parameter below.  Small values will result
#    in fast but more unstable execution, large values will improve
#    stability at the cost of speed.  Basically, N is a number of seconds
#    to wait for operation to complete.  Should be positive.  Test runs
#    about 25*N seconds (it sleeps most of the time, so CPU speed is not
#    relevant).
let $N = 5;
#
# 2. Some subtests
#    - create a new time zone
#    - run some statements
#    - delete the new time zone.
#    But the time zone name used gets somewhere cached and it cannot be
#    "reused" later in the same or another session for a new time zone.
#    Experiments (2008-11 MySQL 5.1) showed that none of the available
#    RESET/FLUSH commands removes these entries.
#    2008-11 MySQL 5.1 Bug#39979 main.events_time_zone does not clean up
#                      second bad effect
#    Therefore we compute unique and unusual timezone names to minimize
#    the likelihood that a later test uses the same name.
#
# 3. The subtests mentioned in 2. cause that the AUTO_INCREMENT value
#    within "SHOW CREATE TABLE mysql.timezone" differ from the initial one.
#    (Bug#39979 main.events_time_zone does not clean up)
#    Therefore we reset this value after each of these subtests.
#
# Note(mleich):
#    There is a significant likelihood that future improvements of the server
#    cause that the solutions for the issues mentioned in 2. and 3. will no
#    more work.
#    A mysql-test-run.pl feature which allows to enforce
#    1. Server shutdown (-> Problem mentioned in 2. disappears)
#    2. Reset all data to initial state (-> Problem mentioned in 3. disappears)
#    3. Server start
#    after a tests would be a perfect replacement.
#

--source include/big_test.inc


--disable_warnings
DROP DATABASE IF EXISTS mysqltest_db1;
--enable_warnings

CREATE DATABASE mysqltest_db1;

let $old_db= `SELECT DATABASE()`;
USE mysqltest_db1;

SET GLOBAL EVENT_SCHEDULER= OFF;
SET @save_time_zone= @@TIME_ZONE;


#
# BUG#16420: Events: timestamps become UTC
# BUG#26429: SHOW CREATE EVENT is incorrect for an event that
#            STARTS NOW()
# BUG#26431: Impossible to re-create an event from backup if its
#            STARTS clause is in the past
# WL#3698: Events: execution in local time zone
#

#----------------------------------------------------------------------

# Create rounding function.

# Disable query log to hide actual value of $N.
--disable_query_log
eval SET @step= $N;
--enable_query_log

# Since we are working in a separate database, we may use any names we
# like.
CREATE TABLE t_step (step INT);
INSERT INTO t_step VALUES (@step);

# We can't use @variables in function, because it will be called from
# the event thread, and 'eval' doesn't work for multi-statements, so
# we can't interpolate $variables either, hence we fetch the step
# value from the table.
delimiter //;
CREATE FUNCTION round_to_step(i INT, n INT) RETURNS INT
BEGIN
  DECLARE step INT;

  SELECT * INTO step FROM t_step;

  # We add 0.1 as a protection from inexact division.
  RETURN FLOOR((i % (step * n) + 0.1) / step);
END//
delimiter ;//


# Test time computations wrt Daylight Saving Time shifts.  We also
# test here that the event operates in its time zone (see what NOW()
# returns).
#

# Create a fake time zone with time transitions every 3*$N second.

SET @step3= @step * 3;
SET @step6= @step * 6;

SET @unix_time= UNIX_TIMESTAMP() - 1;
SET @unix_time= @unix_time - @unix_time % @step6;

INSERT INTO mysql.time_zone VALUES (NULL, 'N');
SET @tzid= LAST_INSERT_ID();
INSERT INTO mysql.time_zone_transition_type
  VALUES (@tzid, 0, 0, 0, 'b16420_0');
INSERT INTO mysql.time_zone_transition_type
  VALUES (@tzid, 1, @step3 - @step, 1, 'b16420_1');

let $transition_unix_time= `SELECT @unix_time`;
let $count= 30;
--disable_query_log
while ($count)
{
  eval INSERT INTO mysql.time_zone_transition
         VALUES (@tzid, $transition_unix_time,
                 $transition_unix_time % @step6 = 0);
  let $transition_unix_time= `SELECT $transition_unix_time + @step3`;
  dec $count;
}
--enable_query_log
let $tz_name = `SELECT CONCAT('b16420_a',UNIX_TIMESTAMP())`;
--replace_result $tz_name <TZ_NAME_1>
eval INSERT INTO mysql.time_zone_name VALUES ('$tz_name', @tzid);

CREATE TABLE t1 (count INT, unix_time INT, local_time INT, comment CHAR(80));
CREATE TABLE t2 (count INT);
INSERT INTO t2 VALUES (1);

delimiter //;
CREATE FUNCTION f1(comment CHAR(80)) RETURNS INT
BEGIN
  DECLARE orig_tz CHAR(64);
  DECLARE unix_time INT;
  DECLARE local_now DATETIME;
  DECLARE utc_now DATETIME;
  DECLARE local_time INT;

  SET unix_time= UNIX_TIMESTAMP();
  SET local_now= FROM_UNIXTIME(unix_time);
  SET orig_tz= @@TIME_ZONE;
  SET TIME_ZONE = '+00:00';
  SET utc_now= FROM_UNIXTIME(unix_time);
  SET TIME_ZONE= orig_tz;
  SET local_time = unix_time + TIMESTAMPDIFF(SECOND, utc_now, local_now);

  SET unix_time= round_to_step(unix_time, 6);
  SET local_time= round_to_step(local_time, 6);

  INSERT INTO t1 VALUES ((SELECT count FROM t2),
                         unix_time, local_time, comment);
  RETURN 0;
END//
delimiter ;//

SET TIME_ZONE= '+00:00';
CREATE EVENT e1 ON SCHEDULE EVERY @step SECOND
  STARTS FROM_UNIXTIME(@unix_time) DO SELECT f1("<e1>");

--replace_result $tz_name <TZ_NAME_1>
eval SET TIME_ZONE= '$tz_name';
CREATE EVENT e2 ON SCHEDULE EVERY @step SECOND
  STARTS FROM_UNIXTIME(@unix_time) DO SELECT f1("<e2>");

# We want to start at the beginning of the DST cycle, so we wait
# untill current time divides by @step6.
let $wait_timeout= `SELECT @step6 + 1`;
let $wait_condition= SELECT UNIX_TIMESTAMP() % @step6 = @step6 - 1;
--source include/wait_condition.inc
# The second wait is needed because after the first wait we may end up
# on the ending edge of a second.  Second wait will bring us to the
# beginning edge.
let $wait_timeout= `SELECT @step + 1`;
let $wait_condition= SELECT UNIX_TIMESTAMP() % @step6 = 0;
--source include/wait_condition.inc

# Note that after the scheduler is enabled, the event will be
# scheduled only for the next second.
SET GLOBAL EVENT_SCHEDULER= ON;

# We want to run after the events are executed.
SELECT SLEEP(@step / 2);

let $count= 7;
--disable_query_log
--disable_result_log
while ($count)
{
  SELECT SLEEP(@step);

  eval SELECT CASE $count
       WHEN 5 THEN f1(CONCAT("Second pass after backward -2 step shift,",
                             " e2 should not be executed"))
       WHEN 4 THEN f1(CONCAT("Second pass after backward -2 step shift,",
                             " e2 should not be executed"))
       WHEN 2 THEN f1(CONCAT("Forward +2 step shift, local 0, 1 are skipped,",
                             " e2 should be executed"))
       ELSE f1("e2 should be executed")
       END;
  UPDATE t2 SET count= count + 1;

  dec $count;
}
--enable_result_log
--enable_query_log

SET GLOBAL EVENT_SCHEDULER= OFF;

SELECT * FROM t1 ORDER BY count, comment;

SET TIME_ZONE= @save_time_zone;

DROP EVENT e2;
DROP EVENT e1;
DROP FUNCTION f1;
DROP TABLE t1, t2;

DELETE FROM mysql.time_zone_name            WHERE time_zone_id = @tzid;
DELETE FROM mysql.time_zone_transition_type WHERE time_zone_id = @tzid;
DELETE FROM mysql.time_zone_transition      WHERE time_zone_id = @tzid;
DELETE FROM mysql.time_zone                 WHERE time_zone_id = @tzid;
let $time_zone_auto_inc = `SELECT MAX(Time_zone_id) + 1 FROM mysql.time_zone`;
eval ALTER TABLE mysql.time_zone AUTO_INCREMENT = $time_zone_auto_inc;

#----------------------------------------------------------------------

# Test MONTH interval.
#

SET TIME_ZONE= '+00:00';

CREATE TABLE t1 (event CHAR(2), dt DATE, offset INT);

INSERT INTO mysql.time_zone VALUES (NULL, 'N');
SET @tzid= LAST_INSERT_ID();

SET @now= UNIX_TIMESTAMP();
SET @offset_month_01= UNIX_TIMESTAMP('2030-01-31 12:00:00') - @now;
SET @offset_month_02= UNIX_TIMESTAMP('2030-02-28 12:00:00') - @now - 5*@step;
SET @offset_month_03= UNIX_TIMESTAMP('2030-03-31 12:00:00') - @now - 5*@step;
SET @offset_month_04= UNIX_TIMESTAMP('2030-04-30 12:00:00') - @now - 13*@step;

INSERT INTO mysql.time_zone_transition_type
  VALUES (@tzid, 0, @offset_month_01, 0, 'b16420_0');
INSERT INTO mysql.time_zone_transition_type
  VALUES (@tzid, 1, @offset_month_02, 1, 'b16420_1');
INSERT INTO mysql.time_zone_transition_type
  VALUES (@tzid, 2, @offset_month_03, 1, 'b16420_2');
INSERT INTO mysql.time_zone_transition_type
  VALUES (@tzid, 3, @offset_month_04, 1, 'b16420_3');
INSERT INTO mysql.time_zone_transition
  VALUES (@tzid, @now, 0);
INSERT INTO mysql.time_zone_transition
  VALUES (@tzid, @now + 3 * @step, 1);
INSERT INTO mysql.time_zone_transition
  VALUES (@tzid, @now + 7 * @step, 2);
INSERT INTO mysql.time_zone_transition
  VALUES (@tzid, @now + 12 * @step, 3);
let $tz_name = `SELECT CONCAT('b16420_b',UNIX_TIMESTAMP())`;
--replace_result $tz_name <TZ_NAME_2>
eval INSERT INTO mysql.time_zone_name VALUES ('$tz_name', @tzid);

--replace_result $tz_name <TZ_NAME_2>
eval SET TIME_ZONE= '$tz_name';

SET GLOBAL EVENT_SCHEDULER= ON;

let $now= `SELECT @now`;
--disable_query_log
eval CREATE EVENT e1 ON SCHEDULE EVERY 1 MONTH
       STARTS FROM_UNIXTIME($now - @step) DO
         INSERT INTO t1 VALUES
           ("e1", NOW(), round_to_step(UNIX_TIMESTAMP() - $now, 4) - 1);
eval CREATE EVENT e2 ON SCHEDULE EVERY 1 MONTH
       STARTS FROM_UNIXTIME($now + @step) DO
         INSERT INTO t1 VALUES
           ("e2", NOW(), round_to_step(UNIX_TIMESTAMP() - $now, 4) - 1);
--enable_query_log

let $wait_timeout= `SELECT 16 * @step`;
let $wait_condition= SELECT COUNT(*) = 7 FROM t1;
--source include/wait_condition.inc

SET GLOBAL EVENT_SCHEDULER= OFF;

--echo Below we should see the following:
--echo  - On Jan 31 only e2 is executed, because we started later than
--echo    e1 should have been executed.  Offset of e2 is 0 because of
--echo    the late start, not 1.
--echo  - The next execution is on Feb 28 (last day of Feb).  Both events
--echo    are executed in their times, offsets are -1 and 1.
--echo  - The next time is Mar 31.  Because the time of event
--echo    execution was skipped over, events are executed right away,
--echo    offsets are 2 and 2.
--echo  - The next time is Apr 30.  Events are again executed in their
--echo    appointed times, offsets are -1 and 1.
SELECT * FROM t1 ORDER BY dt, event;

DROP EVENT e2;
DROP EVENT e1;
DROP TABLE t1;

SET TIME_ZONE= @save_time_zone;

DELETE FROM mysql.time_zone_name            WHERE time_zone_id = @tzid;
DELETE FROM mysql.time_zone_transition_type WHERE time_zone_id = @tzid;
DELETE FROM mysql.time_zone_transition      WHERE time_zone_id = @tzid;
DELETE FROM mysql.time_zone                 WHERE time_zone_id = @tzid;
let $time_zone_auto_inc = `SELECT MAX(Time_zone_id) + 1 FROM mysql.time_zone`;
eval ALTER TABLE mysql.time_zone AUTO_INCREMENT = $time_zone_auto_inc;

DROP FUNCTION round_to_step;
DROP TABLE t_step;


DROP DATABASE mysqltest_db1;
--disable_query_log
eval USE $old_db;

--enable_query_log
let $wait_condition=
  SELECT COUNT(*) = 0 FROM information_schema.processlist
  WHERE db='mysqltest_db1' AND command = 'Connect' AND user=current_user();
--source include/wait_condition.inc

--echo End of 5.1 tests.
