package App::ArchLinux::PackagerTools::CPAN::PackagesDetailsFetcher;
use strictures;

use autodie;
use Function::Parameters;
use Log::Any qw($log);
use IPC::Run qw(run);

use App::ArchLinux::PackagerTools::Cache;

=head1 NAME

App::ArchLinux::PackagerTools::CPAN::PackagesDetailsFetcher - Provide access to the 02packages.details CPAN file

=head1 SYNOPSIS

 use App::ArchLinux::PackagerTools::CPAN::PackagesDetailsFetcher;

=head1 DESCRIPTION

Internal class that abstracts access to the 02packages file from CPAN.

=head1 METHODS

=head2 new

 my $fetcher = App::ArchLinux::PackagerTools::CPAN::PackagesDetailsFetcher->new();

Returns a new instance.

=cut

method new($class: $context, $deps = {}) {
	$deps->{cache} //= App::ArchLinux::PackagerTools::Cache->new($context);
	return $class->new_no_defaults($context, $deps);
}

method new_no_defaults($class: $context, $deps = {}) {
	my $self = {};
	bless $self, $class;
	$self->{deps} = $deps;
	return $self;
}

=head2 Public Methods
=cut

=head3 get_packages_data

 my $data = $fetcher->get_packages_data();

Return the uncompressed data of the 02packages.details.txt.gz file.

=cut

method get_packages_data() {
	my $data;
	my $use_cpanplus_index = 1;
	if ($use_cpanplus_index) {
		# This is mostly for development so we don't go over the network on each run.
		my $packages_file = "$ENV{HOME}/.cpanplus/02packages.details.txt.gz";
		run ['zcat', $packages_file], \undef, \$data or die $log->error("Failed to fetch and uncompress CPAN module index: $?")."\n";
	} else {
		# TODO cache the details file locally
		# TODO when we have a cache of this, remove the $use_cpanplus_index part since that is worse than having our own cache
		# TODO make the cpan mirror configurable
		run [qw(curl -s ), "https://cpan.metacpan.org/modules/02packages.details.txt.gz"], '|', ['zcat'], \$data or die $log->error("Failed to fetch and uncompress CPAN module index: $?")."\n";
	}

	return $data;
}

1;

__END__