#!perl -w
# Copyright (C) all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# end-to-end IMAP tests, see unit tests in t/imap.t, too
use v5.12;
use Time::HiRes ();
use PublicInbox::DS qw(now);
use PublicInbox::TestCommon;
use PublicInbox::TailNotify;
use PublicInbox::Config;
require_mods(qw(-imapd Mail::IMAPClient));
my $imap_client = 'Mail::IMAPClient';
my $can_compress = $imap_client->can('compress');
if ($can_compress) { # hope this gets fixed upstream, soon
	require PublicInbox::IMAPClient;
	$imap_client = 'PublicInbox::IMAPClient';
}

require_ok 'PublicInbox::IMAP';
my $first_range = '0';

my $level = 'basic';
SKIP: {
	require_mods('Xapian', 1);
	$level = 'medium';
};

my @V = (1);
push(@V, 2) if require_git('2.6', 1);

my ($tmpdir, $for_destroy) = tmpdir();
my $home = "$tmpdir/home";
BAIL_OUT "mkdir: $!" unless (mkdir($home) and mkdir("$home/.public-inbox"));
my @ibx;
open my $cfgfh, '>', "$home/.public-inbox/config" or BAIL_OUT;
print $cfgfh <<EOM or BAIL_OUT;
[publicinboxmda]
	spamcheck = none
EOM
my $eml;
for my $V (@V) {
	my $ibx = create_inbox("i$V-$level",
				tmpdir => "$tmpdir/i$V", version => $V,
				indexlevel => $level, sub {
		my ($im) = @_;
		$im->add($eml //= eml_load('t/utf8.eml')) or BAIL_OUT;
	});
	push @ibx, $ibx;
	$ibx->{newsgroup} = "inbox.i$V";
	print $cfgfh <<EOF or BAIL_OUT;
[publicinbox "i$V"]
	inboxdir = $ibx->{inboxdir}
	address = $ibx->{-primary_address};
	newsgroup = inbox.i$V
	url = http://example.com/i$V
	indexlevel = $level
EOF
}
close $cfgfh or BAIL_OUT;
local $ENV{HOME} = $home;
my $sock = tcp_server();
my $err = "$tmpdir/stderr.log";
my $out = "$tmpdir/stdout.log";
my $cmd = [ '-imapd', '-W0', "--stdout=$out", "--stderr=$err" ];
my $td = start_script($cmd, undef, { 3 => $sock }) or BAIL_OUT("-imapd: $?");
my ($ihost, $iport) = tcp_host_port($sock);
my %mic_opt = ( Server => $ihost, Port => $iport, Uid => 1 );
my $mic = $imap_client->new(%mic_opt);
my $pre_login_capa = $mic->capability;
is(grep(/\AAUTH=ANONYMOUS\z/, @$pre_login_capa), 1,
	'AUTH=ANONYMOUS advertised pre-login');

$mic->User('lorelei');
$mic->Password('Hunter2');
ok($mic->login && $mic->IsAuthenticated, 'LOGIN works');
my $post_login_capa = $mic->capability;
ok(join("\n", @$pre_login_capa) ne join("\n", @$post_login_capa),
	'got different capabilities post-login');

$mic_opt{Authmechanism} = 'ANONYMOUS';
$mic_opt{Authcallback} = sub { '' };
$mic = $imap_client->new(%mic_opt);
ok($mic && $mic->login && $mic->IsAuthenticated, 'AUTHENTICATE ANONYMOUS');
my $post_auth_anon_capa = $mic->capability;
is_deeply($post_auth_anon_capa, $post_login_capa,
	'auth anon has same capabilities');
my $e;
ok($mic->noop, 'NOOP');
ok($mic->noop, 'NOOP (again)'); # for warnings
ok(!$mic->examine('foo') && ($e = $@), 'EXAMINE non-existent');
like($e, qr/\bNO\b/, 'got a NO on EXAMINE for non-existent');
ok(!$mic->select('foo') && ($e = $@), 'EXAMINE non-existent');
like($e, qr/\bNO\b/, 'got a NO on EXAMINE for non-existent');
my $mailbox1 = "inbox.i1.$first_range";
ok($mic->select('inbox.i1'), 'SELECT on parent succeeds');
ok($mic->noop, 'NOOP while selected');
ok($mic->noop, 'NOOP again while selected'); # check warnings later
ok($mic->select($mailbox1), 'SELECT succeeds');
ok($mic->examine($mailbox1), 'EXAMINE succeeds');
my @raw = $mic->status($mailbox1, qw(Messages uidnext uidvalidity));
is(scalar(@raw), 2, 'got status response');
like($raw[0], qr/\A\*\x20STATUS\x20inbox\.i1\.$first_range\x20
	\(MESSAGES\x20[1-9][0-9]*\x20
	UIDNEXT\x20\d+\x20UIDVALIDITY\x20\d+\)\r\n/sx);
like($raw[1], qr/\A\S+ OK /, 'finished status response');

my @orig_list = @raw = $mic->list;
like($raw[0], qr/^\* LIST \(.*?\) "\." INBOX/,
	'got an inbox');
like($raw[-1], qr/^\S+ OK /, 'response ended with OK');
is(scalar(@raw), scalar(@V) * 2 + 2, 'default LIST response');
@raw = $mic->list('', 'inbox.i1');
is(scalar(@raw), 2, 'limited LIST response');
like($raw[0], qr/^\* LIST \(.*?\) "\." INBOX/,
		'got an inbox.i1');
like($raw[-1], qr/^\S+ OK /, 'response ended with OK');

my $ret = $mic->search('all') or BAIL_OUT "SEARCH FAIL $@";
is_deeply($ret, [ 1 ], 'search all works');
$ret = $mic->search('uid 1') or BAIL_OUT "SEARCH FAIL $@";
is_deeply($ret, [ 1 ], 'search UID 1 works');
$ret = $mic->search('uid 1:1') or BAIL_OUT "SEARCH FAIL $@";
is_deeply($ret, [ 1 ], 'search UID 1:1 works');
$ret = $mic->search('uid 1:*') or BAIL_OUT "SEARCH FAIL $@";
is_deeply($ret, [ 1 ], 'search UID 1:* works');
$ret = $mic->search('DELETED') or BAIL_OUT "SEARCH FAIL $@";
is_deeply($ret, [], 'searching for DELETED returns nothing');

SKIP: {
	skip 'Xapian missing', 8 if $level eq 'basic';
	my $x = $mic->search(qw(smaller 99999));
	is_deeply($x, [1], 'SMALLER works with Xapian (hit)');
	$x = $mic->search(qw(smaller 9));
	is_deeply($x, [], 'SMALLER works with Xapian (miss)');

	$x = $mic->search(qw(larger 99999));
	is_deeply($x, [], 'LARGER works with Xapian (miss)');
	$x = $mic->search(qw(larger 9));
	is_deeply($x, [1], 'LARGER works with Xapian (hit)');

	$x = $mic->search(qw(HEADER Message-ID testmessage@example.com));
	is_deeply($x, [1], 'HEADER Message-ID works');

	$x = $mic->search(qw(DRAFT HEADER Message-ID testmessage@example.com));
	is_deeply($x, [], 'impossible (DRAFT) key filters out match');

	$x = $mic->search(qw(HEADER Message-ID miss));
	is_deeply($x, [], 'HEADER Message-ID can miss');

	my @q = qw[OR HEADER Message-ID testmessage@example.com
			(OR FROM Ryan (OR TO Joe CC Scott))];
	$x = $mic->search(join(' ', @q));
	is_deeply($x, [1], 'nested query works');
}

is_deeply(scalar $mic->flags('1'), [], '->flags works');
{
	# RFC 3501 section 6.4.8 states:
	# Also note that a UID range of 559:* always includes the
	# UID of the last message in the mailbox, even if 559 is
	# higher than any assigned UID value.
	my $exp = $mic->fetch_hash(1, 'UID');
	$ret = $mic->fetch_hash('559:*', 'UID');
	is_deeply($ret, $exp, 'beginning range too big');
	{
		my @w; # Mail::IMAPClient hits a warning via overload
		local $SIG{__WARN__} = sub { push @w, @_ };
		$ret = $mic->fetch_hash(my $r = '559:558', 'UID');
		is_deeply($ret, {}, "out-of-range UID FETCH $r");
		@w = grep(!/\boverload\.pm\b/, @w);
		is_deeply(\@w, [], 'no unexpected warning');
	}
	$ret = $mic->fetch_hash(my $r = '558:559', 'UID');
	is_deeply($ret, {}, "out-of-range UID FETCH $r");
}

for my $r ('1:*', '1', '*') {
	$ret = $mic->fetch_hash($r, 'RFC822') or BAIL_OUT "FETCH $@";
	is_deeply([keys %$ret], [1]);
	like($ret->{1}->{RFC822}, qr/\r\n\r\nThis is a test/, 'read full');

	# ensure Mail::IMAPClient behaves
	my $str = $mic->message_string($r) or BAIL_OUT "->message_string: $@";
	is($str, $ret->{1}->{RFC822}, '->message_string works as expected');

	my $sz = $mic->fetch_hash($r, 'RFC822.size') or BAIL_OUT "FETCH $@";
	is($sz->{1}->{'RFC822.SIZE'}, length($ret->{1}->{RFC822}),
		'RFC822.SIZE');

	$ret = $mic->fetch_hash($r, 'RFC822.HEADER') or BAIL_OUT "FETCH $@";
	is_deeply([keys %$ret], [1]);
	like($ret->{1}->{'RFC822.HEADER'},
		qr/^Message-ID: <testmessage\@example\.com>/ms, 'read header');

	$ret = $mic->fetch_hash($r, 'INTERNALDATE') or BAIL_OUT "FETCH $@";
	is($ret->{1}->{'INTERNALDATE'}, '01-Jan-1970 00:00:00 +0000',
		'internaldate matches');
	ok(!$mic->fetch_hash($r, 'INFERNALDATE'), 'bogus attribute fails');

	my $envelope = $mic->get_envelope($r) or BAIL_OUT("get_envelope: $@");
	is($envelope->{bcc}, 'NIL', 'empty bcc');
	is($envelope->{messageid}, '<testmessage@example.com>', 'messageid');
	is(scalar @{$envelope->{to}}, 1, 'one {to} header');
	# *sigh* too much to verify...
	#use Data::Dumper; diag Dumper($envelope);

	$ret = $mic->fetch_hash($r, 'FLAGS') or BAIL_OUT "FETCH $@";
	is_deeply($ret->{1}->{FLAGS}, '', 'no flags');

	$ret = $mic->fetch_hash($r, 'BODY[1]') or BAIL_OUT "FETCH $@";
	like($ret->{1}->{'BODY[1]'}, qr/\AThis is a test message/, 'BODY[1]');

	$ret = $mic->fetch_hash($r, 'BODY[1]<1>') or BAIL_OUT "FETCH $@";
	like($ret->{1}->{'BODY[1]<1>'}, qr/\Ahis is a test message/,
			'BODY[1]<1>');

	$ret = $mic->fetch_hash($r, 'BODY[1]<2.3>') or BAIL_OUT "FETCH $@";
	is($ret->{1}->{'BODY[1]<2>'}, "is ", 'BODY[1]<2.3>');
	$ret = $mic->bodypart_string($r, 1, 3, 2) or
					BAIL_OUT "bodypart_string $@";
	is($ret, "is ", 'bodypart string');

	$ret = $mic->fetch_hash($r, 'BODY[HEADER.FIELDS.NOT (Message-ID)]')
		or BAIL_OUT "FETCH $@";
	$ret = $ret->{1}->{'BODY[HEADER.FIELDS.NOT (MESSAGE-ID)]'};
	unlike($ret, qr/message-id/i, 'Message-ID excluded');
	like($ret, qr/\r\n\r\n\z/s, 'got header end');

	$ret = $mic->fetch_hash($r, 'BODY[HEADER.FIELDS (Message-ID)]')
		or BAIL_OUT "FETCH $@";
	is($ret->{1}->{'BODY[HEADER.FIELDS (MESSAGE-ID)]'},
		'Message-ID: <testmessage@example.com>'."\r\n\r\n",
		'got only Message-ID');

	my $bs = $mic->get_bodystructure($r) or BAIL_OUT("bodystructure: $@");
	ok($bs, 'got a bodystructure');
	is(lc($bs->bodytype), 'text', '->bodytype');
	is(lc($bs->bodyenc), '8bit', '->bodyenc');
}
ok($mic->has_capability('COMPRESS') ||
	$mic->has_capability('COMPRESS=DEFLATE'), 'deflate cap');
SKIP: {
	skip 'Mail::IMAPClient too old for ->compress', 2 if !$can_compress;
	my $c = $imap_client->new(%mic_opt);
	ok($c && $c->compress, 'compress enabled');
	ok($c->examine($mailbox1), 'EXAMINE succeeds after COMPRESS');
	$ret = $c->search('uid 1:*') or BAIL_OUT "SEARCH FAIL $@";
	is_deeply($ret, [ 1 ], 'search UID 1:* works after compression');
}

ok($mic->logout, 'logout works');

my $have_inotify = eval { require PublicInbox::Inotify; 1 };

for my $ibx (@ibx) {
	my $name = $ibx->{name};
	my $ng = $ibx->{newsgroup};
	my $mic = $imap_client->new(%mic_opt);
	ok($mic && $mic->login && $mic->IsAuthenticated, "authed $name");
	my $mb = "$ng.$first_range";
	my $uidnext = $mic->uidnext($mb); # we'll fetch BODYSTRUCTURE on this
	ok($uidnext, 'got uidnext for later fetch');
	ok($mic->has_capability('IDLE'), "IDLE capa $name");
	ok(!$mic->idle, "IDLE fails w/o SELECT/EXAMINE $name");
	ok($mic->examine($mb), "EXAMINE $ng succeeds");
	ok(my $idle_tag = $mic->idle, "IDLE succeeds on $ng");
	my $im = $ibx->importer(0);
	$im->add(eml_load 't/data/message_embed.eml') or BAIL_OUT;
	$im->done;
	my $t0 = Time::HiRes::time();
	ok(my @res = $mic->idle_data(11), "IDLE succeeds on $ng");
	is(grep(/\A\* [0-9] EXISTS\b/, @res), 1, 'got EXISTS message');
	ok((Time::HiRes::time() - $t0) < 10, 'IDLE client notified');

	my (@ino_info, $ino_fdinfo);
	SKIP: {
		skip 'no inotify support', 1 unless $have_inotify;
		skip 'missing /proc/$PID/fd', 1 if !-d "/proc/$td->{pid}/fd";
		my @ino = grep {
			readlink($_) =~ /\binotify\b/
		} glob("/proc/$td->{pid}/fd/*");
		is(scalar(@ino), 1, 'only one inotify FD');
		my $ino_fd = (split('/', $ino[0]))[-1];
		$ino_fdinfo = "/proc/$td->{pid}/fdinfo/$ino_fd";
		if (open my $fh, '<', $ino_fdinfo) {
			local $/ = "\n";
			@ino_info = grep(/^inotify wd:/, <$fh>);
			ok(scalar(@ino_info), 'inotify has watches');
		} else {
			skip "$ino_fdinfo missing: $!", 1;
		}
	};

	# ensure IDLE persists across HUP, w/o extra watches or FDs
	$td->kill('HUP') or BAIL_OUT "failed to kill -imapd: $!";
	for my $n (1..2) { # kick the event loop so we know HUP is done
		my $m = $imap_client->new(%mic_opt);
		ok($m->login && $m->IsAuthenticated && $m->logout,
			"connection $n works after HUP");
	}

	$im->add(eml_load 't/data/0001.patch') or BAIL_OUT;
	$im->done;
	$t0 = Time::HiRes::time();
	ok(@res = $mic->idle_data(11), "IDLE succeeds on $ng after HUP");
	is(grep(/\A\* [0-9] EXISTS\b/, @res), 1, 'got EXISTS message');
	ok((Time::HiRes::time() - $t0) < 10, 'IDLE client notified');
	ok($mic->done($idle_tag), 'IDLE DONE');
	my $bs = $mic->get_bodystructure($uidnext);
	ok($bs, 'BODYSTRUCTURE ok for deeply nested');
	$ret = $mic->fetch_hash($uidnext, 'BODY') or BAIL_OUT "FETCH $@";
	ok($ret->{$uidnext}->{BODY}, 'got something in BODY');

	# this matches dovecot behavior
	$ret = $mic->fetch_hash($uidnext, 'BODY[1]') or BAIL_OUT "FETCH $@";
	is($ret->{$uidnext}->{'BODY[1]'},
		"testing embedded message harder\r\n", 'BODY[1]');
	$ret = $mic->fetch_hash($uidnext, 'BODY[2]') or BAIL_OUT "FETCH $@";
	like($ret->{$uidnext}->{'BODY[2]'},
		qr/\ADate: Sat, 18 Apr 2020 22:20:20 /, 'BODY[2]');

	$ret = $mic->fetch_hash($uidnext, 'BODY[2.1.1]') or BAIL_OUT "FETCH $@";
	is($ret->{$uidnext}->{'BODY[2.1.1]'},
		"testing embedded message\r\n", 'BODY[2.1.1]');

	$ret = $mic->fetch_hash($uidnext, 'BODY[2.1.2]') or BAIL_OUT "FETCH $@";
	like($ret->{$uidnext}->{'BODY[2.1.2]'}, qr/\AFrom: /,
		'BODY[2.1.2] tip matched');
	like($ret->{$uidnext}->{'BODY[2.1.2]'},
		 # trailing CRLF may vary depending on MIME parser
		 qr/done_testing;(?:\r\n){1,2}\z/,
		'BODY[2.1.2] tail matched');

	$ret = $mic->fetch_hash("1:$uidnext", 'BODY[2.HEADER]') or
						BAIL_OUT "2.HEADER $@";
	like($ret->{$uidnext}->{'BODY[2.HEADER]'},
		qr/\ADate: Sat, 18 Apr 2020 22:20:20 /,
		'2.HEADER of message/rfc822');

	$ret = $mic->fetch_hash($uidnext, 'BODY[2.MIME]') or
		BAIL_OUT "2.MIME $@";
	is($ret->{$uidnext}->{'BODY[2.MIME]'}, <<EOF, 'BODY[2.MIME]');
Content-Type: message/rfc822\r
Content-Disposition: attachment; filename="embed2x\.eml"\r
\r
EOF

	my @hits = $mic->search('SENTON' => '18-Apr-2020');
	is_deeply(\@hits, [ $uidnext ], 'search with date condition works');
	ok($mic->examine($ng), 'EXAMINE on dummy');
	@hits = $mic->search('SENTSINCE' => '18-Apr-2020');
	is_deeply(\@hits, [], 'search on dummy with condition works');
	ok(!$mic->search('SENTSINCE' => '18-Abr-2020'), 'bad month fails');
	$mic->Uid(0);
	my $ret = $mic->fetch_hash(2, 'RFC822');
	is_deeply($ret, {},
		'MSN FETCH on empty dummy will not trigger warnings, later');
}; # for @ibx

# message sequence numbers :<
is($mic->Uid(0), 0, 'disable UID on '.ref($mic));
ok($mic->reconnect, 'reconnected');
$ret = $mic->fetch_hash('1,2:3', 'RFC822') or BAIL_OUT "FETCH $@";
is(scalar keys %$ret, 3, 'got all 3 messages with comma-separated sequence');
$ret = $mic->fetch_hash('1:*', 'RFC822') or BAIL_OUT "FETCH $@";
is(scalar keys %$ret, 3, 'got all 3 messages');

SKIP: {
	# do any clients use non-UID IMAP SEARCH?
	skip 'Xapian missing', 3 if $level eq 'basic';
	my $x = $mic->search('all');
	is_deeply($x, [1, 2, 3], 'MSN SEARCH works before rm');
	$x = $mic->search(qw(header subject embedded));
	is_deeply($x, [2], 'MSN SEARCH on Subject works before rm');
	$x = $mic->search('FROM scraper@example.com');
	is_deeply($x, [], "MSN SEARCH miss won't trigger warnings");
}

{
	my $rdr = { 0 => \($ret->{1}->{RFC822}) };
	my $env = { HOME => $ENV{HOME} };
	my @cmd = qw(-learn rm --all);
	run_script(\@cmd, $env, $rdr) or BAIL_OUT('-learn rm');
}

SKIP: {
	# do any clients use non-UID IMAP SEARCH?  We only ensure
	# MSN "SEARCH" can return a result which can be retrieved
	# via MSN "FETCH"
	skip 'Xapian missing', 3 if $level eq 'basic';
	my $x = $mic->search(qw(header subject embedded));
	is(scalar(@$x), 1, 'MSN SEARCH on Subject works after rm');
	SKIP: {
		skip 'previous test failed', 1 if !scalar(@$x);
		$x = $mic->message_string($x->[0]);
		is($x, $ret->{2}->{RFC822}, 'message 2 unchanged');
	}
	$x = $mic->search(qw(text embedded));
	is(scalar(@$x), 1, 'MSN SEARCH on TEXT works after rm');
}

# FIXME? no EXPUNGE response, yet
my $r2 = $mic->fetch_hash('1:*', 'BODY.PEEK[]') or BAIL_OUT "FETCH $@";
is(scalar keys %$r2, 2, 'did not get all 3 messages');
is($r2->{2}->{'BODY[]'}, $ret->{2}->{RFC822}, 'message 2 unchanged');
is($r2->{3}->{'BODY[]'}, $ret->{3}->{RFC822}, 'message 3 unchanged');
$r2 = $mic->fetch_hash(2, 'BODY.PEEK[HEADER.FIELDS (message-id)]')
			or BAIL_OUT "FETCH $@";
is($r2->{2}->{'BODY[HEADER.FIELDS (MESSAGE-ID)]'},
	'Message-ID: <20200418222508.GA13918@dcvr>'."\r\n\r\n",
	'BODY.PEEK[HEADER.FIELDS ...] drops .PEEK');

{
	my @new_list = $mic->list;
	# tag differs in [-1]
	like($orig_list[-1], qr/\A\S+ OK List done\r\n/, 'orig LIST');
	like($new_list[-1], qr/\A\S+ OK List done\r\n/, 'new LIST');
	pop @new_list;
	pop @orig_list;
	# TODO: not sure if sort order matters, imapd_refresh_finalize
	# doesn't sort, hopefully clients don't care...
	@new_list = sort @new_list;
	@orig_list = sort @orig_list;
	is_deeply(\@new_list, \@orig_list, 'LIST identical');
}
ok($mic->close, 'CLOSE works');
ok(!$mic->close, 'CLOSE not idempotent');
ok($mic->logout, 'logged out');

{
	my $c = tcp_connect($sock);
	$c->autoflush(1);
	like(<$c>, qr/\* OK/, 'got a greeting');
	print $c "\r\n";
	like(<$c>, qr/\A\* BAD Error in IMAP command/, 'empty line');
	print $c "tagonly\r\n";
	like(<$c>, qr/\Atagonly BAD Error in IMAP command/, 'tag-only line');
}

{
	ok(my $ic = $imap_client->new(%mic_opt), 'logged in');
	my $mb = "$ibx[0]->{newsgroup}.$first_range";
	ok($ic->examine($mb), "EXAMINE $mb");
	my $uidnext = $ic->uidnext($mb); # we'll fetch BODYSTRUCTURE on this
	my $im = $ibx[0]->importer(0);
	$im->add(PublicInbox::Eml->new(<<EOF)) or BAIL_OUT;
Subject: test Ævar
Message-ID: <smtputf8-delivered-mess\@age>
From: Ævar Arnfjörð Bjarmason <avarab\@example>
To: git\@vger.kernel.org

EOF
	$im->done;
	my $envl = $ic->get_envelope($uidnext);
	is($envl->{subject}, 'test Ævar', 'UTF-8 subject');
	is($envl->{sender}->[0]->{personalname}, 'Ævar Arnfjörð Bjarmason',
		'UTF-8 sender[0].personalname');
	SKIP: {
		skip 'need compress for comparisons', 1 if !$can_compress;
		ok($ic = $imap_client->new(%mic_opt), 'uncompressed logged in');
		ok($ic && $ic->compress, 'compress enabled');
		ok($ic->examine($mb), "EXAMINE $mb");
		my $raw = $ic->get_envelope($uidnext);
		is_deeply($envl, $raw, 'raw and compressed match');
	}
}

my $wait_re = sub {
	my ($tail_notify, $re) = @_;
	my $end = now() + 5;
	my (@l, @all);
	until (grep(/$re/, @l = $tail_notify->getlines(5)) || now > $end) {
		push @all, @l;
		@l = ();
	}
	return \@l if @l;
	diag explain(\@all);
	xbail "never got `$re' message";
};

my $watcherr = "$tmpdir/watcherr";

SKIP: {
	use_ok 'PublicInbox::InboxIdle';
	require_git '1.8.5', 4;
	my $old_env = { HOME => $ENV{HOME} };
	my $home = "$tmpdir/watch_home";
	mkdir $home or BAIL_OUT $!;
	mkdir "$home/.public-inbox" or BAIL_OUT $!;
	local $ENV{HOME} = $home;
	my $name = 'watchimap';
	my $addr = "i1-$level\@example.com";
	my $url = "http://example.com/i1";
	my $inboxdir = "$tmpdir/watchimap";
	my $cmd = ['-init', '-V2', '-Lbasic', $name, $inboxdir, $url, $addr];
	my $imapurl = "imap://$ihost:$iport/inbox.i1.0";
	run_script($cmd) or BAIL_OUT("init $name");
	xsys(qw(git config), "--file=$home/.public-inbox/config",
			"publicinbox.$name.watch",
			$imapurl) == 0 or BAIL_OUT "git config $?";
	my $cfg = PublicInbox::Config->new;
	PublicInbox::DS->Reset;
	my $ii = PublicInbox::InboxIdle->new($cfg);
	my $cb = sub { @PublicInbox::DS::post_loop_do = (sub {}) };
	my $obj = bless \$cb, 'PublicInbox::TestCommon::InboxWakeup';
	$cfg->each_inbox(sub { $_[0]->subscribe_unlock('ident', $obj) });
	open my $err_wr, '>>', $watcherr or BAIL_OUT $!;
	my $errw = PublicInbox::TailNotify->new($watcherr);
	my $w = start_script(['-watch'], undef, { 2 => $err_wr });

	diag 'waiting for initial fetch...';
	PublicInbox::DS::event_loop();
	diag 'inbox unlocked on initial fetch, waiting for IDLE';

	$wait_re->($errw, qr/# \S+ idling/);

	open my $fh, '<', 't/iso-2202-jp.eml' or BAIL_OUT $!;
	$old_env->{ORIGINAL_RECIPIENT} = $addr;
	ok(run_script([qw(-mda --no-precheck)], $old_env, { 0 => $fh }),
		'delivered a message for IDLE to kick -watch') or
		diag "mda error \$?=$?";
	diag 'waiting for IMAP IDLE wakeup';
	@PublicInbox::DS::post_loop_do = ();
	PublicInbox::DS::event_loop();
	diag 'inbox unlocked on IDLE wakeup';

	# try again with polling
	xsys(qw(git config), "--file=$home/.public-inbox/config",
		'imap.PollInterval', 0.11) == 0
		or BAIL_OUT "git config $?";
	$w->kill('HUP');
	diag 'waiting for -watch reload + initial fetch';

	$wait_re->($errw, qr/# will check/);

	open $fh, '<', 't/psgi_attach.eml' or BAIL_OUT $!;
	ok(run_script([qw(-mda --no-precheck)], $old_env, { 0 => $fh }),
		'delivered a message for -watch PollInterval');

	diag 'waiting for PollInterval wakeup';
	@PublicInbox::DS::post_loop_do = ();
	PublicInbox::DS::event_loop();
	diag 'inbox unlocked (poll)';
	$w->kill;
	$w->join;
	is($?, 0, 'no error in exited -watch process');

	$cfg->each_inbox(sub { shift->unsubscribe_unlock('ident') });
	$ii->close;
	PublicInbox::DS->Reset;
	open my $errfh, '<', $watcherr or xbail "open: $!";
	my @err = grep(!/^(?:I:|#)/, <$errfh>);
	is(@err, 0, 'no warnings/errors from -watch'.join(' ', @err));

	SKIP: { # not sure how reliable this test can be
		skip 'TEST_KILL_IMAPD not set', 1 if !$ENV{TEST_KILL_IMAPD};
		$^O eq 'linux' or
			diag "TEST_KILL_IMAPD may not be reliable under $^O";
		xsys(qw(git config), "--file=$home/.public-inbox/config",
			qw(--unset imap.PollInterval)) == 0
			or BAIL_OUT "git config $?";
		unlink $watcherr or xbail $!;
		open my $err_wr, '>>', $watcherr or xbail $!;
		my @t0 = times;
		$w = start_script(['-watch'], undef, { 2 => $err_wr });

		$wait_re->($errw, qr/# \S+ idling/);

		diag 'killing imapd, waiting for CPU spins';
		my $delay = 0.11;
		$td->kill(9);
		tick $delay;
		$w->kill;
		$w->join;
		is($?, 0, 'no error in exited -watch process');
		my @t1 = times;
		my $c = $t1[2] + $t1[3] - $t0[2] - $t0[3];
		my $thresh = (0.9 * $delay);
		diag "c=$c, threshold=$thresh";
		ok($c < $thresh, 'did not burn much CPU');
		open $errfh, '<', $watcherr or xbail "open: $!";
		is_deeply([grep(/ line \d+$/m, <$errfh>)], [],
				'no backtraces from errors');
	}
}

$td->kill;
$td->join;
is($?, 0, 'no error in exited process') if !$ENV{TEST_KILL_IMAPD};
open my $fh, '<', $err or BAIL_OUT("open $err failed: $!");
my $eout = do { local $/; <$fh> };
unlike($eout, qr/wide/i, 'no Wide character warnings');
unlike($eout, qr/uninitialized/i, 'no uninitialized warnings');

done_testing;