# Based on postgres/contrib/bloom/t/001_wal.pl

# Test generic xlog record work for ivfflat index replication.
use strict;
use warnings;
use PostgresNode;
use TestLib;
use Test::More tests => 31;

my $node_primary;
my $node_replica;

# Run few queries on both primary and replica and check their results match.
sub test_index_replay
{
	my ($test_name) = @_;

	# Wait for replica to catch up
	my $applname = $node_replica->name;

	my $caughtup_query;
	my $server_version_num = $node_primary->safe_psql("postgres", "SHOW server_version_num");
	if ($server_version_num >= 100000) {
		$caughtup_query = "SELECT pg_current_wal_lsn() <= replay_lsn FROM pg_stat_replication WHERE application_name = '$applname';";
	} else {
		# TODO figure out why replay location doesn't work
		$caughtup_query = "SELECT pg_current_xlog_location() <= write_location FROM pg_stat_replication WHERE application_name = '$applname';";
	}

	$node_primary->poll_query_until('postgres', $caughtup_query)
	  or die "Timed out while waiting for replica 1 to catch up";

	my $r1 = rand();
	my $r2 = rand();
	my $r3 = rand();

	my $queries = qq(SET enable_seqscan=off;
SELECT * FROM tst ORDER BY v <-> '[$r1,$r2,$r3]' LIMIT 10;
);

	# Run test queries and compare their result
	my $primary_result = $node_primary->safe_psql("postgres", $queries);
	my $replica_result = $node_replica->safe_psql("postgres", $queries);

	is($primary_result, $replica_result, "$test_name: query result matches");
	return;
}

# Initialize primary node
$node_primary = get_new_node('primary');
$node_primary->init(allows_streaming => 1);
$node_primary->start;
my $backup_name = 'my_backup';

# Take backup
$node_primary->backup($backup_name);

# Create streaming replica linking to primary
$node_replica = get_new_node('replica');
$node_replica->init_from_backup($node_primary, $backup_name,
	has_streaming => 1);
$node_replica->start;

# Create ivfflat index on primary
$node_primary->safe_psql("postgres", "CREATE EXTENSION vector;");
$node_primary->safe_psql("postgres", "CREATE TABLE tst (i int4, v vector(3));");
$node_primary->safe_psql("postgres",
	"INSERT INTO tst SELECT i%10, ARRAY[random(), random(), random()] FROM generate_series(1,100000) i;"
);
$node_primary->safe_psql("postgres",
	"CREATE INDEX ON tst USING ivfflat (v);");

# Test that queries give same result
test_index_replay('initial');

# Run 10 cycles of table modification. Run test queries after each modification.
for my $i (1 .. 10)
{
	$node_primary->safe_psql("postgres", "DELETE FROM tst WHERE i = $i;");
	test_index_replay("delete $i");
	$node_primary->safe_psql("postgres", "VACUUM tst;");
	test_index_replay("vacuum $i");
	my ($start, $end) = (100001 + ($i - 1) * 10000, 100000 + $i * 10000);
	$node_primary->safe_psql("postgres",
		"INSERT INTO tst SELECT i%10, ARRAY[random(), random(), random()] FROM generate_series($start,$end) i;"
	);
	test_index_replay("insert $i");
}