#!/usr/bin/perl -w
# Copyright (C) 2015-2018 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# Basic tool to create a Xapian search index for a git repository
# configured for public-inbox.
# Usage with libeatmydata <https://www.flamingspork.com/projects/libeatmydata/>
# highly recommended: eatmydata public-inbox-index REPO_DIR

use strict;
use warnings;
use Getopt::Long qw(:config gnu_getopt no_ignore_case auto_abbrev);
my $usage = "public-inbox-index REPO_DIR";
use PublicInbox::Admin qw(resolve_repo_dir);
PublicInbox::Admin::require_or_die('-index');
require PublicInbox::Config;

my $config = eval { PublicInbox::Config->new } || eval {
	warn "public-inbox unconfigured for serving, indexing anyways...\n";
	undef;
};

my $reindex;
my $prune;
my $jobs = undef;
my $indexlevel;
my %opts = (
	'--reindex' => \$reindex,
	'--jobs|j=i' => \$jobs,
	'--prune' => \$prune,
        'L|indexlevel=s' => \$indexlevel,
);
GetOptions(%opts) or die "bad command-line args\n$usage";
die "--jobs must be positive\n" if defined $jobs && $jobs < 0;

my @dirs;

if (@ARGV) {
	@dirs = map { resolve_repo_dir($_) } @ARGV;
} else {
	@dirs = (resolve_repo_dir());
}

sub usage { print STDERR "Usage: $usage\n"; exit 1 }
usage() unless @dirs;

defined($config) and $config->each_inbox(sub {
	my ($ibx) = @_;

	for my $i (0..$#dirs) {
		next if $dirs[$i] ne $ibx->{mainrepo};
		$dirs[$i] = $ibx;
	}
});

my @inboxes;
my $mods = {};

foreach my $dir (@dirs) {
	my $ibx = $dir;
	if (!ref($ibx)) {
		unless (-d $dir) {
			die "$dir does not appear to be an inbox repository\n";
		}
		$ibx = PublicInbox::Inbox->new({
			mainrepo => $dir,
			name => 'unnamed',
			indexlevel => $indexlevel,
			version => -f "$dir/inbox.lock" ? 2 : 1,
		});
	} elsif (defined $indexlevel && !defined($ibx->{indexlevel})) {
		# XXX: users can shoot themselves in the foot, with this...
		$ibx->{indexlevel} = $indexlevel;
	}
	push @inboxes, $ibx;
	PublicInbox::Admin::scan_ibx_modules($mods, $ibx);
}

PublicInbox::Admin::require_or_die(keys %$mods);

require PublicInbox::SearchIdx;
index_inbox($_) for @inboxes;

sub index_inbox {
	my ($repo) = @_;
	if (ref($repo) && ($repo->{version} || 1) == 2) {
		eval { require PublicInbox::V2Writable };
		die "v2 requirements not met: $@\n" if $@;
		my $v2w = eval {
			PublicInbox::V2Writable->new($repo, {nproc=>$jobs});
		};
		if (defined $jobs) {
			if ($jobs == 0) {
				$v2w->{parallel} = 0;
			} else {
				my $n = $v2w->{partitions};
				if ($jobs != ($n + 1)) {
					warn
"Unable to respect --jobs=$jobs, inbox was created with $n partitions\n";
				}
			}
		}
		local $SIG{__WARN__} = sub {
			print STDERR $v2w->{current_info}, ': ', @_;
		};
		$v2w->index_sync({ reindex => $reindex, prune => $prune });
	} else {
		my $s = PublicInbox::SearchIdx->new($repo, 1);
		$s->index_sync({ reindex => $reindex });
	}
}