# 2014 June 17
#
# 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 script is testing the FTS5 module.
#
# Specifically, this tests that, provided the amount of data remains 
# constant, the FTS index does not grow indefinitely as rows are inserted 
# and deleted,
#

source [file join [file dirname [info script]] fts5_common.tcl]
set testprefix fts5aj

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

proc doc {} {
  set dict [list a b c d e f g h i j k l m n o p q r s t u v w x y z]
  set res [list]
  for {set i 0} {$i < 20} {incr i} {
    lappend res [lindex $dict [expr int(rand() * 26)]]
  }
  set res
}

proc structure {} {
  set val [db one {SELECT fts5_decode(rowid,block) FROM t1_data WHERE rowid=10}]
  foreach lvl [lrange $val 1 end] {
    lappend res [expr [llength $lvl]-2]
  }
  set res
}

expr srand(0)
do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(x);
  INSERT INTO t1(t1, rank) VALUES('pgsz', 64);
}

for {set iTest 0} {$iTest < 50000} {incr iTest} {
  if {$iTest > 1000} { execsql { DELETE FROM t1 WHERE rowid=($iTest-1000) } }
  set new [doc]
  execsql { INSERT INTO t1 VALUES($new) }
  if {$iTest==10000} { set sz1 [db one {SELECT count(*) FROM t1_data}] }
  if {0==($iTest % 1000)} {
    set sz [db one {SELECT count(*) FROM t1_data}]
    set s [structure]
    do_execsql_test 1.$iTest.$sz.{$s} {
      INSERT INTO t1(t1) VALUES('integrity-check') 
    }
  }
}

do_execsql_test 2.0 { INSERT INTO t1(t1) VALUES('integrity-check') }


finish_test
