use warnings;
use strict;

use Test::More;
use Test::Exception;

use SQL::Abstract::Test import => [qw(is_same_sql dumper)];
use SQL::Abstract::Tree;

my $sqlat = SQL::Abstract::Tree->new;

my @sql = (
  "INSERT INTO artist DEFAULT VALUES",
  "INSERT INTO artist VALUES ()",
  "SELECT a, b, c FROM foo WHERE foo.a = 1 and foo.b LIKE 'station'",
  "SELECT COUNT( * ) FROM foo",
  "SELECT COUNT( * ), SUM( blah ) FROM foo",
  "SELECT * FROM (SELECT * FROM foobar) WHERE foo.a = 1 and foo.b LIKE 'station'",
  "SELECT * FROM lolz WHERE ( foo.a = 1 ) and foo.b LIKE 'station'",
  "SELECT [screen].[id], [screen].[name], [screen].[section_id], [screen].[xtype] FROM [users_roles] [me] JOIN [roles] [role] ON [role].[id] = [me].[role_id] JOIN [roles_permissions] [role_permissions] ON [role_permissions].[role_id] = [role].[id] JOIN [permissions] [permission] ON [permission].[id] = [role_permissions].[permission_id] JOIN [permissionscreens] [permission_screens] ON [permission_screens].[permission_id] = [permission].[id] JOIN [screens] [screen] ON [screen].[id] = [permission_screens].[screen_id] WHERE ( [me].[user_id] = ? ) GROUP BY [screen].[id], [screen].[name], [screen].[section_id], [screen].[xtype]",
  "SELECT * FROM foo WHERE NOT EXISTS (SELECT bar FROM baz)",
  "SELECT * FROM (SELECT SUM (CASE WHEN me.artist = 'foo' THEN 1 ELSE 0 END AS artist_sum) FROM foobar) WHERE foo.a = 1 and foo.b LIKE 'station'",
  "SELECT * FROM (SELECT SUM (CASE WHEN GETUTCDATE() > DATEADD(second, 4 * 60, last_checkin) THEN 1 ELSE 0 END) FROM foobar) WHERE foo.a = 1 and foo.b LIKE 'station'",
  "SELECT COUNT( * ) FROM foo me JOIN bar rel_bar ON rel_bar.id_bar = me.fk_bar WHERE NOT EXISTS (SELECT inner_baz.id_baz FROM baz inner_baz WHERE ( ( inner_baz.fk_a != ? AND ( fk_bar = me.fk_bar AND name = me.name ) ) ) )",
  "SELECT foo AS bar FROM baz ORDER BY x + ? DESC, oomph, y - ? DESC, unf, baz.g / ? ASC, buzz * 0 DESC, foo DESC, ickk ASC",
  "SELECT inner_forum_roles.forum_id FROM forum_roles AS inner_forum_roles LEFT JOIN user_roles AS inner_user_roles USING(user_role_type_id) WHERE inner_user_roles.user_id = users__row.user_id",
  "SELECT * FROM foo WHERE foo.a @@ to_tsquery('word')",
  "SELECT * FROM foo ORDER BY name + ?, [me].[id]",
  "SELECT foo AS bar FROM baz ORDER BY x + ? DESC, baz.g",
  "SELECT [me].[id], ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS [rno__row__index] FROM ( SELECT [me].[id] FROM [LogParents] [me]) [me]",
  # deliberate batshit insanity
  "SELECT foo FROM bar WHERE > 12",
);

# FIXME FIXME FIXME
# The formatter/unparser accumulated a ton of technical debt,
# and I don't have time to fix it all :( Some of the problems:
# - format() does an implicit parenthesis unroll for prettyness
#   which makes it hard to do exact comparisons
# - there is no space preservation framework (also makes comparisons
#   problematic)
# - there is no operator case preservation framework either
#
# So what we do instead is resort to some monkey patching and
# lowercasing and stuff to get something we can compare to the
# original SQL string
# Ugly but somewhat effective

for my $orig (@sql) {
  my $plain_formatted = $sqlat->format($orig);
  is_same_sql( $plain_formatted, $orig, 'Formatted string is_same_sql()-matched' );

  my $ast = $sqlat->parse($orig);
  my $reassembled = do {
    no warnings 'redefine';
    local *SQL::Abstract::Tree::_parenthesis_unroll = sub {};
    $sqlat->unparse($ast);
  };

  # deal with whitespace around parenthesis readjustment
  $_ =~ s/ \s* ( [ \(\) ] ) \s* /$1/gx
    for ($orig, $reassembled);

  is (
    lc($reassembled),
    lc($orig),
    sprintf( 'roundtrip works (%s...)', substr $orig, 0, 20 )
  ) or do {
    my ($ast1, $ast2) = map { dumper( $sqlat->parse($_) ) } ( $orig, $reassembled );

    note "ast1: $ast1";
    note "ast2: $ast2";
  };
}

# this is invalid SQL, we are just checking that the parser
# does not inadvertently make it right
my $sql = 'SELECT * FROM foo WHERE x IN ( ( 1 ) )';
is(
  $sqlat->unparse($sqlat->parse($sql)),
  $sql,
  'Multi-parens around IN survive',
);

lives_ok { $sqlat->unparse( $sqlat->parse( <<'EOS' ) ) } 'Able to parse/unparse grossly malformed sql';
SELECT
  (
    SELECT *, *  FROM EXISTS bar JOIN ON a = b
    NOT WHERE c !!= d
  ),
  NOT x,
  (
    SELECT * FROM bar WHERE NOT NOT EXISTS (SELECT 1)
  ),
WHERE NOT NOT 1 AND OR foo IN (1,2,,,3,,,),
GROUP BY bar

EOS

done_testing;