# 2011 July 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.
#

if {![info exists testdir]} {
  set testdir [file join [file dirname [info script]] .. .. test]
} 
source [file join [file dirname [info script]] session_common.tcl]
source $testdir/tester.tcl
ifcapable !session {finish_test; return}

set testprefix session8

proc noop {args} {}

# Like [dbcksum] in tester.tcl. Except this version is not sensitive
# to changes in the value of implicit IPK columns.
#
proc udbcksum {db dbname} {
  if {$dbname=="temp"} {
    set master sqlite_temp_master
  } else {
    set master $dbname.sqlite_master
  }
  set alltab [$db eval "SELECT name FROM $master WHERE type='table'"]
  set txt [$db eval "SELECT * FROM $master"]\n
  foreach tab $alltab {
    append txt [lsort [$db eval "SELECT * FROM $dbname.$tab"]]\n
  }
  return [md5 $txt]
}

proc do_then_undo {tn sql} {
  set ck1 [udbcksum db main]

  sqlite3session S db main
  S attach *
  db eval $sql

  set ck2 [udbcksum db main]
  
  set invert [sqlite3changeset_invert [S changeset]]
  S delete
  sqlite3changeset_apply db $invert noop

  set ck3 [udbcksum db main]

  set a [expr {$ck1==$ck2}]
  set b [expr {$ck1==$ck3}]
  uplevel [list do_test $tn.1 "set {} $a" 0]
  uplevel [list do_test $tn.2 "set {} $b" 1]
}

do_execsql_test 1.1 {
  CREATE TABLE t1(a PRIMARY KEY, b);
  INSERT INTO t1 VALUES(1, 2);
  INSERT INTO t1 VALUES("abc", "xyz");
}
do_then_undo 1.2 { INSERT INTO t1 VALUES(3, 4); }
do_then_undo 1.3 { DELETE FROM t1 WHERE b=2; }
do_then_undo 1.4 { UPDATE t1 SET b = 3 WHERE a = 1; }

do_execsql_test 2.1 {
  CREATE TABLE t2(a, b PRIMARY KEY);
  INSERT INTO t2 VALUES(1, 2);
  INSERT INTO t2 VALUES('abc', 'xyz');
}
do_then_undo 1.2 { INSERT INTO t2 VALUES(3, 4); }
do_then_undo 1.3 { DELETE FROM t2 WHERE b=2; }
do_then_undo 1.4 { UPDATE t1 SET a = '123' WHERE b = 'xyz'; }

do_execsql_test 3.1 {
  CREATE TABLE t3(a, b, c, d, e, PRIMARY KEY(c, e));
  INSERT INTO t3 VALUES('x', 45, 0.0, 'abcdef', 12);
  INSERT INTO t3 VALUES(45, 0.0, 'abcdef', 12, 'x');
  INSERT INTO t3 VALUES(0.0, 'abcdef', 12, 'x', 45);
}

do_then_undo 3.2 { UPDATE t3 SET b=b||b WHERE e!='x' }
do_then_undo 3.3 { UPDATE t3 SET a = 46 }

finish_test