#!/usr/bin/env perl

use strict;
use warnings;
use threads;
use Fcntl;
use Env qw(HOME);

use constant MC_FILE_PATH => '/tmp/mc_';

sub notify
{
	my ($str) = @_;
	my $pid;

	$pid = fork();
	if (not $pid) {
		exec('herbe', $str);
	}
	return;
}

sub get_new_mail
{
	my ($acc) = @_;
	my $ret;

	system('killall mbsync >/dev/null 2>&1');
	$ret = system('mbsync', 'qwe');
	if ($ret != 0)  {
		notify("  $acc: failed to sync mails");
	}
	return;
}

sub get_all_accounts
{
	my @accs;

	opendir(my $dh, $ENV{'MAIL'}) or die $!;
	@accs = grep { !/^\./ } readdir($dh);
	closedir($dh);
	return @accs;
}

sub count_new_mails
{
	my ($acc, $maildir) = @_;
	my $count;
	my $dir;
	my $path = $maildir . $acc . '/INBOX/new';

	$count = 0;
	opendir(my $dh, $path) or die $!;
	$count = grep { -f "$path/$_"} readdir($dh);
	closedir($dh);
	return $count;
}

sub fetch_thread
{
	return;
}

sub fetch_mail
{
	$ENV{'MAIL'} = $HOME . '/.local/share/mail';
	$ENV{'GNUPGHOME'} = $HOME . '/.local/share/gnupg';
	$ENV{'PASSWORD_STORE_DIR'} = $HOME . '/.local/share/pass';
	my $maildir = $ENV{'MAIL'} . '/';
	# my $notify_str = "  new mails\n";

	# test gpg
	my @accs = get_all_accounts();
	foreach (@accs) {
		my $pre_count = -1;
		my $mc_file = MC_FILE_PATH . $_;
		my $fh;
		if (-f $mc_file) {
			open($fh, '+<', $mc_file) or die $!;
			$pre_count = <$fh>;
		} else {
			open($fh, '+>', $mc_file) or die $!;
			$pre_count = -1;
		}
		# if ($pre_count == -1) {
		# 	$pre_count = count_new_mails($_, $maildir);
		# }
		get_new_mail($_); # error if fail
		my $post_count = count_new_mails($_, $maildir);
		if ($post_count > $pre_count && $post_count > 0) {
			my $notify_str = '  ' . $_ . ': ' . $post_count . ' new mail';
			$notify_str .= ($post_count > 1 ? "s\n" : "\n");
			notify($notify_str)
		}
		seek($fh, 0, 0);
		print $fh "$post_count";
		close($fh);
	}
	# notify($notify_str) if (length($notify_str) > $og_length);
	return;
}

fetch_mail();

__END__