#! /usr/bin/perl -w

use strict;
use File::Path;

-d "tmp" or mkdir "tmp";
chdir "tmp" or die "Cannot enter temp direcory.\n";

sub show($$@);
sub test($$);

################################################################################

my @x01 = (
 [ 8,
   1, 1, "F", 2, 2, "", 3, 3, "FS", 4, 4, "", 5, 5, "T", 6, 6, "F", 7, 7, "FT", 9, 0, "" ],
 [ 8,
   1, 1, "", 2, 2, "F", 3, 3, "F", 4, 4, "", 5, 5, "", 7, 7, "", 8, 8, "", 10, 0, "" ],
 [ 8, 0, 0,
   1, 1, "", 2, 2, "", 3, 3, "", 4, 4, "", 5, 5, "", 6, 6, "", 7, 7, "", 8, 8, "" ],
);

#show("01", "01", "", "", "");
my @X01 = (
 [ "", "", "" ],
 [ 10,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 5, 5, "T", 6, 6, "FT", 7, 7, "FT", 9, 9, "", 10, 10, "" ],
 [ 10,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 5, 5, "T", 7, 7, "FT", 8, 8, "T", 9, 10, "", 10, 9, "" ],
 [ 9, 0, 9,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 5, 5, "T", 6, 0, "", 7, 7, "FT", 0, 8, "", 10, 9, "", 9, 10, "" ],
);
test(\@x01, \@X01);

#show("01", "02", "", "", "Expunge Both\n");
my @X02 = (
 [ "", "", "Expunge Both\n" ],
 [ 10,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 9, 9, "", 10, 10, "" ],
 [ 10,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 9, 10, "", 10, 9, "" ],
 [ 9, 0, 9,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 10, 9, "", 9, 10, "" ],
);
test(\@x01, \@X02);

#show("01", "03", "", "", "Expunge Slave\n");
my @X03 = (
 [ "", "", "Expunge Slave\n" ],
 [ 10,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 5, 5, "T", 6, 6, "FT", 7, 7, "FT", 9, 9, "", 10, 10, "" ],
 [ 10,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 9, 10, "", 10, 9, "" ],
 [ 9, 0, 9,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 5, 5, "T", 6, 0, "", 7, 7, "FT", 10, 9, "", 9, 10, "" ],
);
test(\@x01, \@X03);

#show("01", "04", "", "", "Sync Pull\n");
my @X04 = (
 [ "", "", "Sync Pull\n" ],
 [ 9,
   1, 1, "F", 2, 2, "", 3, 3, "FS", 4, 4, "", 5, 5, "T", 6, 6, "F", 7, 7, "FT", 9, 9, "" ],
 [ 9,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 5, 5, "T", 7, 7, "FT", 8, 8, "T", 9, 9, "", 10, 0, "" ],
 [ 9, 0, 0,
   1, 1, "F", 2, 2, "", 3, 3, "FS", 4, 4, "", 5, 5, "T", 6, 6, "", 7, 7, "FT", 0, 8, "", 9, 9, "" ],
);
test(\@x01, \@X04);

#show("01", "05", "", "", "Sync Flags\n");
my @X05 = (
 [ "", "", "Sync Flags\n" ],
 [ 8,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 5, 5, "T", 6, 6, "F", 7, 7, "FT", 9, 0, "" ],
 [ 8,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 5, 5, "T", 7, 7, "FT", 8, 8, "", 10, 0, "" ],
 [ 8, 0, 0,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 5, 5, "T", 6, 6, "", 7, 7, "FT", 8, 8, "" ],
);
test(\@x01, \@X05);

#show("01", "06", "", "", "Sync Delete\n");
my @X06 = (
 [ "", "", "Sync Delete\n" ],
 [ 8,
   1, 1, "F", 2, 2, "", 3, 3, "FS", 4, 4, "", 5, 5, "T", 6, 6, "FT", 7, 7, "FT", 9, 0, "" ],
 [ 8,
   1, 1, "", 2, 2, "F", 3, 3, "F", 4, 4, "", 5, 5, "", 7, 7, "", 8, 8, "T", 10, 0, "" ],
 [ 8, 0, 0,
   1, 1, "", 2, 2, "", 3, 3, "", 4, 4, "", 5, 5, "", 6, 0, "", 7, 7, "", 0, 8, "" ],
);
test(\@x01, \@X06);

#show("01", "07", "", "", "Sync New\n");
my @X07 = (
 [ "", "", "Sync New\n" ],
 [ 10,
   1, 1, "F", 2, 2, "", 3, 3, "FS", 4, 4, "", 5, 5, "T", 6, 6, "F", 7, 7, "FT", 9, 9, "", 10, 10, "" ],
 [ 10,
   1, 1, "", 2, 2, "F", 3, 3, "F", 4, 4, "", 5, 5, "", 7, 7, "", 8, 8, "", 9, 10, "", 10, 9, "" ],
 [ 9, 0, 9,
   1, 1, "", 2, 2, "", 3, 3, "", 4, 4, "", 5, 5, "", 6, 6, "", 7, 7, "", 8, 8, "", 10, 9, "", 9, 10, "" ],
);
test(\@x01, \@X07);

#show("01", "08", "", "", "Sync PushFlags PullDelete\n");
my @X08 = (
 [ "", "", "Sync PushFlags PullDelete\n" ],
 [ 8,
   1, 1, "F", 2, 2, "F", 3, 3, "FS", 4, 4, "", 5, 5, "T", 6, 6, "F", 7, 7, "FT", 9, 0, "" ],
 [ 8,
   1, 1, "", 2, 2, "F", 3, 3, "F", 4, 4, "", 5, 5, "", 7, 7, "", 8, 8, "T", 10, 0, "" ],
 [ 8, 0, 0,
   1, 1, "", 2, 2, "F", 3, 3, "F", 4, 4, "", 5, 5, "", 6, 6, "", 7, 7, "", 0, 8, "" ],
);
test(\@x01, \@X08);

################################################################################

chdir "..";
rmdir "tmp";
print "OK.\n";
exit 0;


sub fcfg(@)
{
	return join(" // ", map({ my $t = $_; chomp $t; $t =~ s/\n/ \/ /g; $t; } @_));
}

sub qm($)
{
	shift;
	s/\\/\\\\/g;
	s/\"/\\"/g;
	s/\"/\\"/g;
	s/\n/\\n/g;
	return $_;
}

# $global, $master, $slave, $channel
sub runsync($$$)
{
	open(FILE, ">", ".mbsyncrc") or
		die "Cannot open .mbsyncrc.\n";
	print FILE
"MaildirStore master
Path ./
Inbox ./master
".shift()."
MaildirStore slave
Path ./
Inbox ./slave
".shift()."
Channel test
Master :master:
Slave :slave:
SyncState *
".shift();
	close FILE;
	system "../mbsync -q -c .mbsyncrc test";
	unlink ".mbsyncrc";
}

# $path
sub readbox($)
{
	my $bn = shift;

	(-d $bn) or
		die "No mailbox '$bn'.\n";
	(-d $bn."/tmp" and -d $bn."/new" and -d $bn."/cur") or
		die "Invalid mailbox '$bn'.\n";
	open(FILE, "<", $bn."/.uidvalidity") or die "Cannot read UID validity of mailbox '$bn'.\n";
	my $dummy = <FILE>;
	chomp(my $mu = <FILE>);
	close FILE;
	my %ms = ();
	for my $d ("cur", "new") {
		opendir(DIR, $bn."/".$d) or next;
		for my $f (grep(!/^\.\.?$/, readdir(DIR))) {
			my ($uid, $flg, $num);
			if ($f =~ /^\d+\.\d+_\d+\.[-[:alnum:]]+,U=(\d+):2,(.*)$/) {
				($uid, $flg) = ($1, $2);
			} elsif ($f =~ /^\d+\.\d+_(\d+)\.[-[:alnum:]]+:2,(.*)$/) {
				($uid, $flg) = (0, $2);
			} else {
				print STDERR "unrecognided file name '$f' in '$bn'.\n";
				exit 1;
			}
			open(FILE, "<", $bn."/".$d."/".$f) or die "Cannot read message '$f' in '$bn'.\n";
			while (<FILE>) {
				/^Subject: (\d+)$/ && ($num = $1);
			}
			close FILE;
			if (!defined($num)) {
				print STDERR "message '$f' in '$bn' has no identifier.\n";
				exit 1;
			}
			@{ $ms{$num} } = ($uid, $flg);
		}
	}
	return ($mu, %ms);
}

# $boxname, $maxuid, @msgs
sub mkbox($$@)
{
	my ($bn, $mu, @ms) = @_;

	rmtree($bn);
	(mkdir($bn) and mkdir($bn."/tmp") and mkdir($bn."/new") and mkdir($bn."/cur")) or
		die "Cannot create mailbox $bn.\n";
	open(FILE, ">", $bn."/.uidvalidity") or die "Cannot create UID validity for mailbox $bn.\n";
	print FILE "1\n$mu\n";
	close FILE;
	while (@ms) {
		my ($num, $uid, $flg) = (shift @ms, shift @ms, shift @ms);
		if ($uid) {
			$uid = ",U=".$uid;
		} else {
			$uid = "";
		}
		open(FILE, ">", $bn."/cur/0.1_".$num.".local".$uid.":2,".$flg) or
			die "Cannot create message $num in mailbox $bn.\n";
		print FILE "From: foo\nTo: bar\nDate: Thu, 1 Jan 1970 00:00:00 +0000\nSubject: $num\n\n";
		close FILE;
	}
}

# \@master, \@slave, @syncstate
sub mkchan($$@)
{
	my ($m, $s, @t) = @_;
	&mkbox("master", @{ $m });
	&mkbox("slave", @{ $s });
	open(FILE, ">", "slave/.mbsyncstate") or
		die "Cannot create sync state.\n";
	print FILE "1:".shift(@t)." 1:".shift(@t).":".shift(@t)."\n";
	while (@t) {
		print FILE shift(@t)." ".shift(@t)." ".shift(@t)."\n";
	}
	close FILE;
}

# $config, $boxname, $maxuid, @msgs
sub ckbox($$$@)
{
	my ($cfg, $bn, $MU, @MS) = @_;

	my ($mu, %ms) = readbox($bn);
	if ($mu != $MU) {
		print STDERR "NEXTUID mismatch for $bn - expected $MU, got $mu, config: $cfg\n";
		exit 1;
	}
	while (@MS) {
		my ($num, $uid, $flg) = (shift @MS, shift @MS, shift @MS);
		if (!defined $ms{$num}) {
			print STDERR "no message $bn:$num, config: $cfg\n";
			exit 1;
		}
		if ($ms{$num}[0] ne $uid) {
			print STDERR "UID mismatch for $bn:$num - expected $uid, got $ms{$num}[0], config: $cfg\n";
			exit 1;
		}
		if ($ms{$num}[1] ne $flg) {
			print STDERR "flag mismatch for $bn:$num - expected '$flg', got '$ms{$num}[1]', config: $cfg\n";
			exit 1;
		}
	}
}

# $config, \@master, \@slave, @syncstate
sub ckchan($$$@)
{
	my ($cfg, $M, $S, @T) = @_;
	open(FILE, "<", "slave/.mbsyncstate") or
		die "Cannot read sync state.\n";
	my $l = <FILE>;
	my @ls = <FILE>;
	close FILE;
	my $xl = "1:".shift(@T)." 1:".shift(@T).":".shift(@T)."\n";
	if ($l ne $xl) {
		print STDERR "Sync state header mismatch.
Expected: $xl"."Got:      $l"."Config:   $cfg
";
		exit 1;
	}
	for $l (@ls) {
		$xl = shift(@T)." ".shift(@T)." ".shift(@T)."\n";
		if ($l ne $xl) {
			print STDERR "Sync state entry mismatch.
Expected: $xl"."Got:      $l"."Config:   $cfg
";
			exit 1;
		}
	}
	&ckbox($cfg, "master", @{ $M });
	&ckbox($cfg, "slave", @{ $S });
}

sub test($$)
{
	my ($sx, $tx) = @_;
	mkchan($$sx[0], $$sx[1], @{ $$sx[2] });
	&runsync(@{ $$tx[0] });
	ckchan(fcfg(@{ $$tx[0] }), $$tx[1], $$tx[2], @{ $$tx[3] });
	rmtree "slave";
	rmtree "master";
}

# $id, $boxname
sub showbox($$)
{
	my ($bn) = @_;

	my ($mu, %ms) = readbox($bn);
	print " [ $mu,\n   ";
	my $frst = 1;
	for my $num (sort {$a <=> $b} keys %ms) {
		if ($frst) {
			$frst = 0;
		} else {
			print ", ";
		}
		print "$num, $ms{$num}[0], \"$ms{$num}[1]\"";
	}
	print " ],\n";
}

# $num
sub showchan()
{
	&showbox("master");
	&showbox("slave");
	open(FILE, "<", "slave/.mbsyncstate") or
		die "Cannot read sync state.\n";
	$_ = <FILE>;
	/^1:(\d+) 1:(\d+):(\d+)\n$/;
	print " [ $1, $2, $3,\n   ";
	my $frst = 1;
	for (<FILE>) {
		/^(\d+) (\d+) (.*)\n$/;
		if ($frst) {
			$frst = 0;
		} else {
			print ", ";
		}
		print "$1, $2, \"$3\"";
	}
	print " ],\n";
	close FILE;
}

sub show($$@)
{
	my ($sx, $tx, @sfx) = @_;
	my @sp;
	eval "\@sp = \@x$sx";
	mkchan($sp[0], $sp[1], @{ $sp[2] });
	print "my \@x$sx = (\n";
	showchan();
	print ");\n";
	&runsync(@sfx);
	print "my \@X$tx = (\n";
	print " [ ".join(", ", map('"'.qm($_).'"', @sfx))." ],\n";
	showchan();
	print ");\n";
	print "test(\\\@x$sx, \\\@X$tx);\n\n";
	rmtree "slave";
	rmtree "master";
}