#!/usr/bin/env perl
use 5.016;
use strict;
use warnings;

use POSIX 'mkfifo';

my ($pw_pipe, $pid);

sub cleanup {
    unlink($pw_pipe) if $pw_pipe;
    kill KILL => $pid if $pid;
}

$SIG{INT} = $SIG{TERM} = sub { cleanup; exit };
END { cleanup }

$pw_pipe = "/run/user/$>/mbsyncloop";
mkfifo($pw_pipe, 0700) or die "couldn't create $pw_pipe";

my $pw = `rbw get mail.tozt.net doy\@tozt.net`;

$pid = fork;
die unless defined $pid;
if (!$pid) {
    $SIG{PIPE} = sub {};
    while (1) {
        open my $fh, '>', $pw_pipe or die "couldn't open $pw_pipe";
        $fh->print("$pw\n");
        close $fh;
    }
    exit;
}

open my $goimapnotify, '-|', "sh", "-c", "goimapnotify --conf ~/.config/imapnotify/tozt.conf 2>&1" or die;

my $last_all = 0;
while (1) {
    my $now = time;
    if (($now - $last_all) >= 14 * 60) {
        sync("all");
        $last_all = $now;
    }
    if (idle(15 * 60 - (time - $now))) {
        sync("priority");
    }
}

sub sync {
    my ($channel) = @_;
    warn "syncing $channel";
    while (1) {
        my $status = system("mbsync -c ~/.mbsyncloop $channel");
        if (!$status) {
            system("notmuch new | grep -v '^No new mail\.\$'");
            last;
        }
        sleep 5;
    }
    warn "done syncing $channel";
}

sub idle {
    my ($max_delay) = @_;
    my $rin = '';
    vec($rin, fileno($goimapnotify), 1) = 1;
    my $ready = select(my $rout = $rin, undef, undef, $max_delay);
    if ($ready) {
        while (1) {
            my $ready = select(my $rout = $rin, undef, undef, 0.01);
            last unless $ready;
            sysread $goimapnotify, my $data, 4096;
        }
        return 1;
    }
    return 0;
}