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#!/usr/bin/env perl
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#
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# mkindex was written by Omar Polo <op@openbsd.org> and is placed in
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# the public domain.  The author hereby disclaims copyright to this
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# source code.
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use open ":std", ":encoding(UTF-8)";
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use utf8;
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use strict;
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use warnings;
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use v5.32;
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use File::Temp qw(tempfile);
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use OpenBSD::Pledge;
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use OpenBSD::Unveil;
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use lib ".";
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use GotMArc qw(parse san urlencode initpage endpage index_header thread_header);
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my $outdir = $ENV{'OUTDIR'};
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die 'Set $OUTDIR' unless defined $outdir;
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my $tfh; # thread file handle
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my $pfh; # page file handle
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my $page = 0;
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my @pages;
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my @files;
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my $from_day;
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my $to_day;
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my $threads_seen = 0;
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my $last_level = 0;
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my $threads = 0;
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my $threads_per_page = 100;
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sub maxs {
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	my ($a, $b) = @_;
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	return $a unless defined $b;
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	return $a gt $b ? $a : $b;
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}
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sub mins {
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	my ($a, $b) = @_;
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	return $a unless defined $b;
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	return $a lt $b ? $a : $b;
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}
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sub pagename {
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	my $i = shift;
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	return $i == 1 && "index.html" || "$i.html";
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}
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sub endfile {
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	say $pfh '</ul></div>';
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	close($pfh);
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	push @pages, "$from_day - $to_day";
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}
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sub nextfile {
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	endfile if defined $pfh;
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	$page += 1;
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	my $path;
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	($pfh, $path) = tempfile "/tmp/gotmarc.index.XXXXXXXXXX";
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	push @files, $path;
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	say $pfh "<div class='thread'><ul>";
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}
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sub nav {
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	my ($pfh, $n) = @_;
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	my ($first, $last) = (pagename(1), pagename($page));
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	my ($next, $prev) = (pagename($n+1), pagename($n-1));
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	say $pfh "<nav>";
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	say $pfh "<a href='$first'>First</a>" if $n > 2;
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	say $pfh "<a href='$prev'>Prev</a>" if $n > 1;
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	say $pfh "<a href='$next'>Next</a>" if $n < $page;
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	say $pfh "<a href='$last'>Last</a>" if $n < $page - 1;
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	say $pfh "</nav>";
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}
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sub copyfrom {
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	my ($path, $fh) = @_;
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	# there are probably faster ways to do this like File::Copy,
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	# but it bypasses the bufio cache...
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	open(my $pfh, '<', $path) or die "can't open $path: $!";
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	print $fh $_ while <$pfh>;
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}
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sub renderpages {
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	close($pfh);
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	for (my $i = 1; $i <= $page; $i++) {
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		my $name = pagename($i);
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		my $path = shift @files;
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		my $dest = "$outdir/$name";
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		open(my $pfh, '>', $dest)
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		    or die "can't open $dest for writing: $!";
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		my $title = "Game of Trees Mail Archive | page $i";
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		my $subtitle = $pages[$i-1];
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		initpage($pfh, $title);
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		index_header $pfh, $i, $subtitle;
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		say $pfh "<main>";
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		nav $pfh, $i if $page > 1;
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		copyfrom($path, $pfh);
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		nav $pfh, $i if $page > 1;
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		say $pfh "</main>";
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		endpage($pfh);
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		close($pfh);
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		unlink $path;
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	}
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}
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sub endthread {
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	say $tfh "</ul></li>" x $last_level;
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	say $tfh "</ul>\n</div>\n";
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	endpage($tfh);
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	close($tfh);
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	$last_level = 0;
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}
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sub nextthread {
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	endthread if defined $tfh;
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	my ($mid, $subj) = @_;
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	my $dest = "$outdir/thread/$mid.html";
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	open($tfh, '>', $dest) or die "can't open $dest: $!";
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	initpage($tfh, $subj);
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	thread_header $tfh, undef, undef, ["Thread: $subj"];
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	print $tfh "<div class='thread'><ul class='mails'>\n";
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}
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sub entry {
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	my ($fh, $type, $mid, $date, $from, $subj) = @_;
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	my $encmid = urlencode $mid;
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	print $fh "<li id='$encmid' class='mail'>";
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	print $fh "<p class='mail-meta'>";
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	print $fh "<time>$date</time> ";
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	print $fh "<span class='from'>$from</span>";
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	print $fh "<span class='colon'>:</span>";
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	print $fh "</p>";
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	print $fh "<p class='subject'>";
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	print $fh "<a href='/$type/$encmid.html'>$subj</a>";
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	print $fh "</p>";
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	print $fh "</li>\n";
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}
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sub thread_entry {
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	my ($fh, $mid, $level, $date, $from, $subj) = @_;
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	say $fh "</ul>\n</li>" x ($last_level - $level) if $last_level > $level;
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	say $fh "<li>\n<ul>" if $last_level < $level;
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	entry $fh, "mail", $mid, $date, $from, $subj;
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}
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unveil($outdir, "rwc") or die "unveil $outdir: $!";
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unveil(".", "r") or die "unveil .: $!";
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# can't use tmppath because File::Temp checks wether /tmp exists.
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unveil("/tmp", "rwc") or die "unveil /tmp: $!";
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# fattr for File::Temp
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pledge("stdio rpath wpath cpath fattr") or die "pledge: $!";
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nextfile;
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while (<>) {
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	my ($level, $fname, $mid, $date, $from, $subj) = parse;
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	if ($level == 0) {
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		nextthread $mid, $subj;
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		$threads++;
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		if ($threads > $threads_per_page) {
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			nextfile;
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			$threads = 0;
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			$to_day = undef;
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			$from_day = undef;
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		}
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		my $day = $date =~ s/ .*//r;
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		$to_day = mins $day, $to_day;
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		$from_day = maxs $day, $from_day;
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		entry $pfh, "thread", $mid, $date, $from, $subj;
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	}
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	thread_entry $tfh, $mid, $level, $date, $from, $subj;
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	$last_level = $level;
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	$threads_seen = 1;
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}
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endfile;
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endthread if $threads_seen;
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renderpages;