# 2009 January 3
#
# 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.
#
#***********************************************************************
#
# $Id: savepoint6.test,v 1.4 2009/06/05 17:09:12 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

proc sql {zSql} {
  uplevel db eval [list $zSql]
  #puts stderr "$zSql ;"
}

set DATABASE_SCHEMA {
    PRAGMA auto_vacuum = incremental;
    CREATE TABLE t1(x, y);
    CREATE UNIQUE INDEX i1 ON t1(x);
    CREATE INDEX i2 ON t1(y);
}

#--------------------------------------------------------------------------
# In memory database state.
#
# ::lSavepoint is a list containing one entry for each active savepoint. The
# first entry in the list corresponds to the most recently opened savepoint.
# Each entry consists of two elements:
#
#   1. The savepoint name.
#
#   2. A serialized Tcl array representing the contents of table t1 at the
#      start of the savepoint. The keys of the array are the x values. The
#      values are the y values.
#  
# Array ::aEntry contains the contents of database table t1. Array keys are
# x values, the array data values are y values.
#
set lSavepoint [list]
array set aEntry [list]

proc x_to_y {x} {
  set nChar [expr int(rand()*250) + 250]
  set str " $nChar [string repeat $x. $nChar]"
  string range $str 1 $nChar
}
#--------------------------------------------------------------------------

#-------------------------------------------------------------------------
# Procs to operate on database:
#
#   savepoint NAME
#   rollback  NAME
#   release   NAME
#
#   insert_rows XVALUES
#   delete_rows XVALUES
#
proc savepoint {zName} {
  catch { sql "SAVEPOINT $zName" }
  lappend ::lSavepoint [list $zName [array get ::aEntry]]
}

proc rollback {zName} {
  catch { sql "ROLLBACK TO $zName" }
  for {set i [expr {[llength $::lSavepoint]-1}]} {$i>=0} {incr i -1} {
    set zSavepoint [lindex $::lSavepoint $i 0]
    if {$zSavepoint eq $zName} {
      unset -nocomplain ::aEntry
      array set ::aEntry [lindex $::lSavepoint $i 1]


      if {$i+1 < [llength $::lSavepoint]} {
        set ::lSavepoint [lreplace $::lSavepoint [expr $i+1] end]
      }
      break
    }
  }
}

proc release {zName} {
  catch { sql "RELEASE $zName" }
  for {set i [expr {[llength $::lSavepoint]-1}]} {$i>=0} {incr i -1} {
    set zSavepoint [lindex $::lSavepoint $i 0]
    if {$zSavepoint eq $zName} {
      set ::lSavepoint [lreplace $::lSavepoint $i end]
      break
    }
  }

  if {[llength $::lSavepoint] == 0} {
    #puts stderr "-- End of transaction!!!!!!!!!!!!!"
  }
}

proc insert_rows {lX} {
  foreach x $lX {
    set y [x_to_y $x]

    # Update database [db]
    sql "INSERT OR REPLACE INTO t1 VALUES($x, '$y')"

    # Update the Tcl database.
    set ::aEntry($x) $y
  }
}

proc delete_rows {lX} {
  foreach x $lX {
    # Update database [db]
    sql "DELETE FROM t1 WHERE x = $x"

    # Update the Tcl database.
    unset -nocomplain ::aEntry($x)
  }
}
#-------------------------------------------------------------------------

#-------------------------------------------------------------------------
# Proc to compare database content with the in-memory representation.
#
#   checkdb
#
proc checkdb {} {
  set nEntry [db one {SELECT count(*) FROM t1}]
  set nEntry2 [array size ::aEntry]
  if {$nEntry != $nEntry2} {
    error "$nEntry entries in database, $nEntry2 entries in array"
  }
  db eval {SELECT x, y FROM t1} {
    if {![info exists ::aEntry($x)]} {
      error "Entry $x exists in database, but not in array"
    }
    if {$::aEntry($x) ne $y} {
      error "Entry $x is set to {$y} in database, {$::aEntry($x)} in array"
    }
  }

  db eval { PRAGMA integrity_check }
}
#-------------------------------------------------------------------------

#-------------------------------------------------------------------------
# Proc to return random set of x values.
#
#   random_integers
#
proc random_integers {nRes nRange} {
  set ret [list]
  for {set i 0} {$i<$nRes} {incr i} {
    lappend ret [expr int(rand()*$nRange)]
  }
  return $ret
} 
#-------------------------------------------------------------------------

proc database_op {} {
  set i [expr int(rand()*2)] 
  if {$i==0} {
    insert_rows [random_integers 100 1000]
  }
  if {$i==1} {
    delete_rows [random_integers 100 1000]
    set i [expr int(rand()*3)] 
    if {$i==0} {
      sql {PRAGMA incremental_vacuum}
    }
  }
}

proc savepoint_op {} {
  set names {one two three four five}
  set cmds  {savepoint savepoint savepoint savepoint release rollback}

  set C [lindex $cmds [expr int(rand()*6)]]
  set N [lindex $names [expr int(rand()*5)]]

  #puts stderr "   $C $N ;  "
  #flush stderr

  $C $N
  return ok
}

expr srand(0)

############################################################################
############################################################################
# Start of test cases.

do_test savepoint6-1.1 {
  sql $DATABASE_SCHEMA
} {}
do_test savepoint6-1.2 {
  insert_rows {
    497 166 230 355 779 588 394 317 290 475 362 193 805 851 564 
    763 44 930 389 819 765 760 966 280 538 414 500 18 25 287 320 
    30 382 751 87 283 981 429 630 974 421 270 810 405 
  }

  savepoint one
  insert_rows 858
  delete_rows 930
  savepoint two
    execsql {PRAGMA incremental_vacuum}
    savepoint three
      insert_rows 144
     rollback three
    rollback two
  release one

  execsql {SELECT count(*) FROM t1}
} {44}

foreach zSetup [list {
  set testname normal
  sqlite3 db test.db
} {
  set testname tempdb
  sqlite3 db ""
} {
  if {[catch {set ::permutations_test_prefix} z] == 0 && $z eq "journaltest"} {
    continue
  }
  set testname nosync
  sqlite3 db test.db
  sql { PRAGMA synchronous = off }
} {
  set testname smallcache
  sqlite3 db test.db
  sql { PRAGMA cache_size = 10 }
}] {

  unset -nocomplain ::lSavepoint
  unset -nocomplain ::aEntry

  catch { db close }
  file delete -force test.db
  eval $zSetup
  sql $DATABASE_SCHEMA

  do_test savepoint6-$testname.setup {
    savepoint one
    insert_rows [random_integers 100 1000]
    release one
    checkdb
  } {ok}
  
  for {set i 0} {$i < 1000} {incr i} {
    do_test savepoint6-$testname.$i.1 {
      savepoint_op
      checkdb
    } {ok}
  
    do_test savepoint6-$testname.$i.2 {
      database_op
      database_op
      checkdb
    } {ok}
  }
}

unset -nocomplain ::lSavepoint
unset -nocomplain ::aEntry

finish_test