# 2010 April 13
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing the operation of the library in
# "PRAGMA journal_mode=WAL" mode.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/lock_common.tcl
source $testdir/wal_common.tcl
source $testdir/malloc_common.tcl
ifcapable !wal {finish_test ; return }

set a_string_counter 1
proc a_string {n} {
  global a_string_counter
  incr a_string_counter
  string range [string repeat "${a_string_counter}." $n] 1 $n
}
db func a_string a_string

#-------------------------------------------------------------------------
# When a rollback or savepoint rollback occurs, the client may remove
# elements from one of the hash tables in the wal-index. This block
# of test cases tests that nothing appears to go wrong when this is
# done.
#
do_test wal3-1.0 {
  execsql {
    PRAGMA page_size = 1024;
    PRAGMA auto_vacuum = off;
    PRAGMA synchronous = normal;
    PRAGMA journal_mode = WAL;
    PRAGMA wal_autocheckpoint = 0;
    BEGIN;
      CREATE TABLE t1(x);
      INSERT INTO t1 VALUES( a_string(800) );                  /*    1 */
      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*    2 */
      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*    4 */
      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*    8 */
      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*   16 */
      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*   32 */
      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*   64 */
      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*  128*/
      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*  256 */
      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*  512 */
      INSERT INTO t1 SELECT a_string(800) FROM t1;             /* 1024 */
      INSERT INTO t1 SELECT a_string(800) FROM t1;             /* 2048 */
      INSERT INTO t1 SELECT a_string(800) FROM t1 LIMIT 2000;  /* 4048 */
    COMMIT;
    PRAGMA cache_size = 10;
  }
  wal_frame_count test.db-wal 1024
} 4086

for {set i 1} {$i < 20} {incr i} {

  do_test wal3-1.$i.1 {
    set str [a_string 800]
    execsql { UPDATE t1 SET x = $str WHERE rowid = $i }
    lappend L [wal_frame_count test.db-wal 1024]
    execsql {
      BEGIN;
        INSERT INTO t1 SELECT a_string(800) FROM t1 LIMIT 100;
      ROLLBACK;
      PRAGMA integrity_check;
    }
  } {ok}

  # Check that everything looks OK from the point of view of an 
  # external connection.
  #
  sqlite3 db2 test.db
  do_test wal3-1.$i.2 {
    execsql { SELECT count(*) FROM t1 } db2
  } 4048
  do_test wal3-1.$i.3 {
    execsql { SELECT x FROM t1 WHERE rowid = $i }
  } $str
  do_test wal3-1.$i.4 {
    execsql { PRAGMA integrity_check } db2
  } {ok}
  db2 close
  
  # Check that the file-system in its current state can be recovered.
  # 
  file copy -force test.db test2.db
  file copy -force test.db-wal test2.db-wal
  file delete -force test2.db-journal
  sqlite3 db2 test2.db
  do_test wal3-1.$i.5 {
    execsql { SELECT count(*) FROM t1 } db2
  } 4048
  do_test wal3-1.$i.6 {
    execsql { SELECT x FROM t1 WHERE rowid = $i }
  } $str
  do_test wal3-1.$i.7 {
    execsql { PRAGMA integrity_check } db2
  } {ok}
  db2 close
}

finish_test