use v5.36;
use Test::More;

plan skip_all => $@ if !eval { require FU::Pg; } && $@ =~ /Unable to load libpq/;
die $@ if $@;
plan skip_all => 'Please set FU_TEST_DB to a PostgreSQL connection string to run these tests' if !$ENV{FU_TEST_DB};

sub okerr($sev, $act, $msg) {
    is ref $@, 'FU::Pg::error';
    is $@->{severity}, $sev;
    is $@->{action}, $act;
    like "$@", $msg;
}

ok !eval { FU::Pg->connect("invalid") };
okerr FATAL => connect => qr/missing "=" after "invalid"/;

ok FU::Pg::lib_version() > 100000;

my $conn = FU::Pg->connect($ENV{FU_TEST_DB})->text;
$conn->_debug_trace(0);

is ref $conn, 'FU::Pg::conn';
ok $conn->server_version > 100000;
is $conn->lib_version, FU::Pg::lib_version();
is $conn->status, 'idle';

subtest '$conn->exec', sub {
    ok !eval { $conn->exec('COPY (SELECT 1) TO STDOUT'); };
    okerr FATAL => exec => qr/unexpected status code/;

    ok !eval { $conn->exec('SELEXT'); };
    okerr ERROR => exec => qr/syntax error/;

    ok !defined $conn->exec('');
    is $conn->exec('SELECT 1'), 1;

    ok !eval { $conn->q('SELEXT')->param_types; };
    okerr ERROR => prepare => qr/syntax error/;

    is $conn->exec('SET client_encoding=utf8'), undef;
};


subtest '$st prepare & exec', sub {
    {
        my $st = $conn->q('SELECT 1');
        is_deeply $st->param_types, [];
        is_deeply $st->columns, [{ name => '?column?', oid => 23 }];
        is $conn->exec('SELECT 1 FROM pg_prepared_statements'), 1;
        is $st->exec, 1;
        ok !eval { $st->exec; 1 };
        like $@, qr/Invalid attempt to execute statement multiple times/;
    }

    {
        my $st = $conn->q("SELECT \$1::int AS a, \$2::char(5) AS \"\x{1F603}\"", 1, 2);
        is_deeply $st->param_types, [ 23, 1042 ];
        is_deeply $st->columns, [
            { oid => 23, name => 'a' },
            { oid => 1042, name => "\x{1F603}", typemod => 9 },
        ];
        is $st->exec, 1;
    }

    is $conn->exec('SELECT 1 FROM pg_prepared_statements'), 0;

    ok !eval { $conn->q('SELECT 1', 1)->exec; 1 };
    like $@, qr/Statement expects 0 bind parameters but 1 were given/;

    ok !eval { $conn->q('SELECT $1')->exec; 1 };
    like $@, qr/Statement expects 1 bind parameters but 0 were given/;

    # prepare + describe won't let us detect empty queries, hmm...
    is_deeply $conn->q('')->param_types, [];
    is_deeply $conn->q('')->columns, [];

    ok !eval { $conn->q('')->exec; 1 };
    okerr FATAL => exec => qr/unexpected status code/;

    is $conn->q('SET client_encoding=utf8')->exec, undef;
};

subtest '$st->val', sub {
    ok !eval { $conn->q('SELECT')->val; 1 };
    like $@, qr/on query returning no data/;

    ok !eval { $conn->q('SELECT 1, 2')->val; 1 };
    like $@, qr/on query returning more than one column/;

    ok !eval { $conn->q('SELECT 1 UNION SELECT 2')->val; 1 };
    like $@, qr/on query returning more than one row/;

    ok !defined $conn->q('SELECT 1 WHERE false')->val;
    ok !defined $conn->q('SELECT null')->val;
    is $conn->q('SELECT $1::text', "\x{1F603}")->val, "\x{1F603}";
};

subtest '$st->rowl', sub {
    ok !eval { $conn->q('SELECT 1 WHERE false')->rowl; 1 };
    like $@, qr/on query returning zero rows/;

    ok !eval { $conn->q('SELECT 1 UNION SELECT 2')->rowl; 1 };
    like $@, qr/on query returning more than one row/;

    ok !eval { $conn->q('SELEXT')->rowl; 1; };
    is scalar $conn->q('SELECT')->rowl, 0;
    is scalar $conn->q('SELECT 1, 2')->rowl, 2;
    is_deeply [$conn->q('SELECT')->rowl], [];
    is_deeply [$conn->q('SELECT 1, null')->rowl], [1, undef];
    is_deeply [$conn->q('SELECT 1, $1', undef)->rowl], [1, undef];
    is_deeply [$conn->q('SELECT 1, $1::int', undef)->text_params(0)->rowl], [1, undef];
};

subtest '$st->rowa', sub {
    ok !eval { $conn->q('SELECT 1 WHERE false')->rowa; 1 };
    like $@, qr/on query returning zero rows/;

    ok !eval { $conn->q('SELECT 1 UNION SELECT 2')->rowa; 1 };
    like $@, qr/on query returning more than one row/;

    ok !eval { $conn->q('SELEXT')->rowa; 1; };
    is_deeply $conn->q('SELECT')->rowa, [];
    is_deeply $conn->q('SELECT 1, 2')->rowa, [1, 2];
    is_deeply $conn->q('SELECT 1, null')->rowa, [1, undef];
    is_deeply $conn->q('SELECT 1, $1', undef)->rowa, [1, undef];
    is_deeply $conn->q('SELECT 1, $1::int', undef)->text_params(0)->rowa, [1, undef];
};

subtest '$st->rowh', sub {
    ok !eval { $conn->q('SELECT 1 WHERE false')->rowh; 1 };
    like $@, qr/on query returning zero rows/;

    ok !eval { $conn->q('SELECT 1 UNION SELECT 2')->rowh; 1 };
    like $@, qr/on query returning more than one row/;

    ok !eval { $conn->q('SELECT 1 as a, 2 as a')->rowh; 1 };
    like $@, qr/Query returns multiple columns with the same name/;

    ok !eval { $conn->q('SELEXT')->rowh; 1; };
    is_deeply $conn->q('SELECT')->rowh, {};
    is_deeply $conn->q('SELECT 1 as a, 2 as b')->rowh, {a => 1, b => 2};
    is_deeply $conn->q('SELECT 1 as a, null as b')->rowh, {a => 1, b => undef};
    is_deeply $conn->q('SELECT 1 as a, $1::int as b', undef)->rowh, {a => 1, b => undef};
};

subtest '$st->alla', sub {
    is_deeply $conn->q('SELECT 1 WHERE false')->alla, [];
    is_deeply $conn->q('SELECT')->alla, [[]];
    is_deeply $conn->q('SELECT 1')->alla, [[1]];
    is_deeply $conn->q('SELECT 1, null UNION ALL SELECT NULL, 2')->alla, [[1,undef],[undef,2]];
};

subtest '$st->allh', sub {
    ok !eval { $conn->q('SELECT 1 as a, 2 as a')->allh; 1 };
    like $@, qr/Query returns multiple columns with the same name/;

    is_deeply $conn->q('SELECT 1 WHERE false')->allh, [];
    is_deeply $conn->q('SELECT')->allh, [{}];
    is_deeply $conn->q('SELECT 1 a')->allh, [{a=>1}];
    is_deeply $conn->q('SELECT 1 a, null b UNION ALL SELECT NULL, 2')->allh, [{a=>1,b=>undef},{a=>undef,b=>2}];
};

subtest '$st->flat', sub {
    is_deeply $conn->q('SELECT 1 WHERE false')->flat, [];
    is_deeply $conn->q('SELECT')->flat, [];
    is_deeply $conn->q('SELECT 1')->flat, [1];
    is_deeply $conn->q('SELECT 1, null UNION ALL SELECT NULL, 2')->flat, [1,undef,undef,2];
};

subtest '$st->kvv', sub {
    ok !eval { $conn->q('SELECT')->kvv; 1; };
    like $@, qr/returning no data/;

    ok !eval { $conn->q('SELECT 1, 2, 3')->kvv; 1; };
    like $@, qr/returning more than two columns/;

    ok !eval { $conn->q('SELECT 1 UNION ALL SELECT 1')->kvv; 1; };
    like $@, qr/is duplicated/;

    is_deeply $conn->q('SELECT 1 WHERE false')->kvv, {};
    is_deeply $conn->q('SELECT 1')->kvv, {1=>1};
    is_deeply $conn->q('SELECT 1, null UNION ALL SELECT 3, 2')->kvv, {1=>undef,3=>2};
};

subtest '$st->kva', sub {
    ok !eval { $conn->q('SELECT')->kva; 1; };
    like $@, qr/returning no data/;

    ok !eval { $conn->q('SELECT 1 UNION ALL SELECT 1')->kva; 1; };
    like $@, qr/is duplicated/;

    is_deeply $conn->q('SELECT 1 WHERE false')->kva, {};
    is_deeply $conn->q('SELECT 1')->kva, {1=>[]};
    is_deeply $conn->q("SELECT 1, null, 'hi' UNION ALL SELECT 3, 2, 'ok'")->kva,
        {1=>[undef,'hi'], 3=>[2, 'ok']};
};

subtest '$st->kvh', sub {
    ok !eval { $conn->q('SELECT')->kvh; 1; };
    like $@, qr/returning no data/;

    ok !eval { $conn->q('SELECT 1 UNION ALL SELECT 1')->kvh; 1; };
    like $@, qr/is duplicated/;

    ok !eval { $conn->q('SELECT 1, 2, 3')->kvh; 1; };
    like $@, qr/Query returns multiple columns with the same name/;

    is_deeply $conn->q('SELECT 1 WHERE false')->kvh, {};
    is_deeply $conn->q('SELECT 1')->kvh, {1=>{}};
    is_deeply $conn->q("SELECT 1 as a , null as a, 'hi' as b UNION ALL SELECT 3, 2, 'ok'")->kvh,
        {1=>{a=>undef,b=>'hi'}, 3=>{a=>2,b=>'ok'}};
};

subtest 'txn', sub {
    $conn->exec('CREATE TEMPORARY TABLE fupg_tst (id int)');
    $conn->txn->exec('INSERT INTO fupg_tst VALUES (1)'); # rolled back
    is $conn->q('SELECT COUNT(*) FROM fupg_tst')->val, 0;

    my $st = $conn->q('SELECT COUNT(*) FROM fupg_tst');
    my $sst;
    {
        my $txn = $conn->txn;
        is $conn->status, 'txn_idle';
        is $txn->status, 'idle';

        ok !eval { $st->exec; 1 };
        like $@, qr/Invalid cross-transaction/;

        ok !eval { $conn->exec('SELECT 1'); 1 };
        like $@, qr/Invalid operation on the top-level connection/;
        ok !eval { $conn->q('SELECT 1'); 1 };
        like $@, qr/Invalid operation on the top-level connection/;
        ok !eval { $conn->txn; 1 };
        like $@, qr/Invalid operation on the top-level connection/;

        $txn->exec('INSERT INTO fupg_tst VALUES (1)');
        $sst = $txn->q('SELECT 1');

        is $conn->status, 'txn_idle';
        is $txn->status, 'idle';
        $txn->commit;
        is $conn->status, 'txn_done';
        is $txn->status, 'done';

        ok !eval { $txn->rollback; 1 };
        like $@, qr/Invalid operation on a transaction that has already been marked as done/;
        ok !eval { $txn->commit; 1 };
        like $@, qr/Invalid operation on a transaction that has already been marked as done/;
        ok !eval { $txn->txn; 1 };
        like $@, qr/Invalid operation on a transaction that has already been marked as done/;
        ok !eval { $txn->exec('select 1'); 1 };
        like $@, qr/Invalid operation on a transaction that has already been marked as done/;
        ok !eval { $txn->q('select 1'); 1 };
        like $@, qr/Invalid operation on a transaction that has already been marked as done/;

        ok !eval { $conn->exec('SELECT 1'); 1 };
        like $@, qr/Invalid operation on the top-level connection/;
    }
    is $conn->status, 'idle';
    is $st->val, 1;
    ok !eval { $sst->exec; 1 };
    like $@, qr/Invalid cross-transaction/;

    {
        my $txn = $conn->txn;
        ok !eval { $txn->exec('SELEXT'); 1 }; # puts txn in error state
        is $conn->status, 'txn_error';
        is $txn->status, 'error';
        ok !eval { $txn->exec('SELECT 1'); 1 };
        like $@, qr/current transaction is aborted/;

        $txn->rollback;
        is $conn->status, 'txn_done';
        is $txn->status, 'done';
    }
    ok $conn->exec('SELECT 1');

    {
        my $txn = $conn->txn;
        my $st = $txn->q('SELECT count(*) FROM fupg_tst WHERE id = 2');
        {
            my $sub = $txn->txn;
            is $conn->status, 'txn_idle';
            is $txn->status, 'txn_idle';
            is $sub->status, 'idle';

            $sub->exec('INSERT INTO fupg_tst VALUES (2)');
            ok !eval { $sub->exec('SELEXT'); 1 };

            ok !eval { $txn->rollback; 1 };
            like $@, qr/Invalid operation on transaction/;

            is $conn->status, 'txn_error';
            is $txn->status, 'txn_error';
            is $sub->status, 'error';
        }
        is $conn->status, 'txn_idle';
        is $txn->status, 'idle';
        is $st->val, 0;

        $st = $txn->q('SELECT count(*) FROM fupg_tst WHERE id = 2');
        {
            my $sub = $txn->txn;
            $sub->exec('INSERT INTO fupg_tst VALUES (2)');
            $sub->commit;
            is $conn->status, 'txn_idle';
            is $txn->status, 'txn_idle'; # No way to tell that it's actually done
            is $sub->status, 'done';
        }
        is $st->val, 1;
    }
    is $conn->status, 'idle';

    {
        my $txn = $conn->txn;
        my $sub = $txn->txn;
        undef $txn; # sub keeps a ref on $txn
        is $sub->status, 'idle';
        is $conn->status, 'txn_idle';
        $sub->exec('INSERT INTO fupg_tst VALUES (3)');
        $sub->commit;
    }
    # We didn't commit $txn, so $sub got aborted as well
    is $conn->q('SELECT count(*) FROM fupg_tst WHERE id = 3')->val, 0;
};

{
    my $st = $conn->q("SELECT 1");
    undef $conn; # statement keeps the connection alive
    is $st->val, 1;
}

done_testing;