# 2020 February 24
#
# 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 UPDATE statements with FROM clauses
# against FTS4 tables.
#
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix fts4upfrom

# If SQLITE_ENABLE_FTS3 is defined, omit this file.
ifcapable !fts3 {
  finish_test
  return
}

foreach {tn create_table} {
  0 { CREATE VIRTUAL TABLE ft USING fts5(a, b, c) }
  1 { CREATE VIRTUAL TABLE ft USING fts3(a, b, c) }
  2 { CREATE TABLE ft(a, b, c) }
  3 { 
    CREATE TABLE real(a, b, c);
    CREATE INDEX i1 ON real(a);
    CREATE VIEW ft AS SELECT rowid, a, b, c FROM real;
    CREATE TRIGGER tr1 INSTEAD OF INSERT ON ft BEGIN
      INSERT INTO real(rowid, a, b, c) VALUES(new.rowid, new.a, new.b, new.c);
    END;
    CREATE TRIGGER tr2 INSTEAD OF UPDATE ON ft BEGIN
      UPDATE real SET rowid=new.rowid, a=new.a, b=new.b, c=new.c 
      WHERE rowid=old.rowid;
    END;
  }
} {
  if {$tn==0} { ifcapable !fts5 { continue } }
  catchsql { DROP VIEW IF EXISTS changes }
  catchsql { DROP TABLE IF EXISTS ft }
  catchsql { DROP VIEW IF EXISTS ft }
  execsql $create_table

  do_execsql_test 1.$tn.0 {
    INSERT INTO ft(a, b, c) VALUES('a', NULL, 'apple');
    INSERT INTO ft(a, b, c) VALUES('b', NULL, 'banana');
    INSERT INTO ft(a, b, c) VALUES('c', NULL, 'cherry');
    INSERT INTO ft(a, b, c) VALUES('d', NULL, 'damson plum');
  }
  
  do_execsql_test 1.$tn.1 {
    SELECT a, b, c FROM ft ORDER BY rowid;
  } {
    a {} apple
    b {} banana
    c {} cherry
    d {} {damson plum}
  }
  
  do_execsql_test 1.$tn.2 {
    UPDATE ft SET b=o.c FROM ft AS o WHERE (ft.a == char(unicode(o.a)+1))
  }
  
  do_execsql_test 1.$tn.3 {
    SELECT a, b, c FROM ft ORDER BY rowid;
  } {
    a {} apple
    b apple banana
    c banana cherry
    d cherry {damson plum}
  }

  do_catchsql_test 1.$tn.4 {
    UPDATE ft SET c=v FROM changes WHERE a=k;
  } {1 {no such table: changes}}

  do_execsql_test 1.$tn.5 {
    create view changes(k, v) AS 
      VALUES( 'd', 'dewberry' ) UNION ALL
      VALUES( 'c', 'clementine' ) UNION ALL
      VALUES( 'b', 'blueberry' ) UNION ALL
      VALUES( 'a', 'apricot' ) 
    ;
  }

  do_execsql_test 1.$tn.6 {
    UPDATE ft SET c=v FROM changes WHERE a=k;
  }

  do_execsql_test 1.$tn.7 {
    SELECT rowid, a, b, c FROM ft ORDER BY rowid;
  } {
    1 a {} apricot
    2 b apple blueberry
    3 c banana clementine
    4 d cherry dewberry
  }

  do_execsql_test 1.$tn.8 "
    WITH x1(o, n) AS (
        VALUES(1, 11) UNION ALL
        VALUES(2, 12) UNION ALL
        VALUES(3, 13) UNION ALL
        VALUES(4, 14)
    )
    SELECT ft.rowid, a, b, c, o, n FROM ft, x1 WHERE ft.rowid = o;
  " {
    1 a {} apricot 1 11
    2 b apple blueberry 2 12
    3 c banana clementine 3 13
    4 d cherry dewberry 4 14
  }

  set ROWID rowid
  if {$tn==1} { set ROWID docid }
  do_execsql_test 1.$tn.9 "
    WITH x1(o, n) AS (
        VALUES(1, 11) UNION ALL
        VALUES(2, 12) UNION ALL
        VALUES(3, 13) UNION ALL
        VALUES(4, 14)
    )
    UPDATE ft SET $ROWID = n FROM x1 WHERE ft.rowid = o;
    SELECT rowid, a, b, c FROM ft ORDER BY rowid;
  " {
    11 a {} apricot
    12 b apple blueberry
    13 c banana clementine
    14 d cherry dewberry
  }
}

finish_test

