# 2023-10-26
#
# 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.
#
#***********************************************************************
# 
#

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

ifcapable !vtab {
  finish_test
  return
}

register_tcl_module db

proc vtab_command {method args} {
  switch -- $method {
    xConnect {
      return "CREATE TABLE t1(a, b, c)"
    }

    xBestIndex {
      set hdl [lindex $args 0]
      set clist [$hdl constraints]
      set orderby [$hdl orderby]

      if {[info exists ::xbestindex_sql]} { 
        explain_i $::xbestindex_sql 
        set ::xbestindex_res [ execsql $::xbestindex_sql ]
      }

      return "cost 1000000 rows 1000000 idxnum 0 idxstr hello"
    }

    xFilter {
      return "sql {SELECT 0, 1, 2, 3}"
    }
  }

  return {}
}

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE x1 USING tcl(vtab_command);
  CREATE TABLE y1(a, b);
  CREATE TABLE y2(a, b);
} {}

do_execsql_test 1.1 {
  SELECT * FROM x1
} {1 2 3}

do_execsql_test 1.2 {
  INSERT INTO y1 VALUES(1, 2) RETURNING rowid;
} {1}

do_execsql_test 1.3 {
  CREATE TRIGGER y1tr BEFORE INSERT ON y1 BEGIN
    SELECT * FROM x1;
  END;
  INSERT INTO y1 VALUES(3, 4) RETURNING rowid;
} {2}


# This time, rig the xBestIndex() method of the vtab to invoke an SQL
# statement that uses RETURNING.
set ::xbestindex_sql {
  INSERT INTO y2 VALUES(NULL, NULL) RETURNING rowid;
}
do_execsql_test 1.4 {
  INSERT INTO y1 VALUES(5, 6) RETURNING rowid;
} {3}

do_test 1.5 {
  set ::xbestindex_res
} {1}

finish_test