# lib/API/Log.pm - API logging subroutines.
# Copyright (C) 2010-2011 Xelhua Development Group, et al.
# This program is free software; rights to this code are stated in doc/LICENSE.
package API::Log;
use strict;
use warnings;
use English qw(-no_match_vars);
use POSIX;
use Time::Local;
use Exporter;
use base qw(Exporter);
use API::Std qw(conf_get);

our @EXPORT_OK = qw(println dbug alog);


# Print with the system newline appended.
sub println
{
	my ($out) = @_;

	if (!defined $out) {
		print $RS;
	}
    else {
        print $out.$RS;
    }

    return 1;
}

# Print only if in debug mode.
sub dbug
{
	my ($out) = @_;

	if ($Auto::DEBUG) {
		# We're in debug mode; print it out.
		println $out;
	}

	return 1;
}

# Log to file.
sub alog
{
	my ($lmsg) = @_;

	# Expire old logs first.
	expire_logs();

	# Get date and time in the desired format.
	my $date = POSIX::strftime('%Y%m%d', localtime);
	my $time = POSIX::strftime('%Y-%m-%d %I:%M:%S %p', localtime);

	# Create var/ if it doesn't exist.
	if (!-d "$Auto::Bin/../var") {
		mkdir "$Auto::Bin/../var", 0600; ## no critic qw(ValuesAndExpressions::ProhibitMagicNumbers)
	}
	# Create var/DATE.log if it doesn't exist.
	if (!-e "$Auto::Bin/../var/$date.log") {
		system "touch $Auto::Bin/../var/$date.log";
	}

	# Open the logfile, print the log message to it and close it.
	open my $FLOG, '>>', "$Auto::Bin/../var/$date.log" or return;
	print {$FLOG} "[$time] $lmsg\n" or return;
	close $FLOG or return;

	return 1;
}

# Expire old logs.
sub expire_logs
{
	# Get configuration value.
	my $celog = (conf_get('expire_logs'))[0][0] or return;

	# Check for invalid values.
	if ($celog =~ m/[^0-9]/sm) { ## no critic qw(RegularExpressions::RequireExtendedFormatting)
		# Must be numbers only.
		return;
	}
	elsif (!$celog) {
		# No expire.
		return;
	}

	# Iterate through each logfile.
	foreach my $file (glob "$Auto::Bin/../var/*") {
		my (undef, $file) = split 'bin/../var/', $file; ## no critic qw(BuiltinFunctions::ProhibitStringySplit)

		# Convert filename to UNIX time.
		my $yyyy = substr $file, 0, 4; ## no critic qw(ValuesAndExpressions::ProhibitMagicNumbers)
		my $mm = substr $file, 4, 2; ## no critic qw(ValuesAndExpressions::ProhibitMagicNumbers)
		$mm = $mm - 1;
		my $dd = substr $file, 6, 2; ## no critic qw(ValuesAndExpressions::ProhibitMagicNumbers)
		my $epoch = timelocal(0, 0, 0, $dd, $mm, $yyyy);

		# If it's older than <config_value> days, delete it.
		if (time - $epoch > 86_400 * $celog) { ## no critic qw(ValuesAndExpressions::ProhibitMagicNumbers)
			unlink "$Auto::Bin/../var/$file";
		}
	}

	return 1;
}


1;
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