#! /usr/bin/perl -w
#
# Written by Oron Peled <oron@actcom.co.il>
# Copyright (C) 2007, Xorcom
# This program is free software; you can redistribute and/or
# modify it under the same terms as Perl itself.
#
# $Id$
#
use strict;
use File::Basename;
BEGIN { my $dir = dirname($0); unshift(@INC, "$dir", "$dir/zconf"); }

use Zaptel::Xpp;
use Zaptel::Xpp::Xbus;

my $sync;
my $autoselect;

if(@ARGV == 1) {
	$sync = shift;
	$autoselect = 1 if $sync =~ /^auto$/i;
}


sub get_sorted_xpds() {
	my @good_xpds;

	foreach my $xbus (Zaptel::Xpp::xbuses('SORT_CONNECTOR')) {
		next unless $xbus->status eq 'CONNECTED';
		foreach my $xpd ($xbus->xpds()) {
			my $isreg = $xpd->zt_registration();
			if(!defined($isreg)) {			# Failure
				printf STDERR "%s: Failed %s\n", $xpd->fqn, $!;
				next;
			}
			next unless $isreg;			# Skip unregistered XPDs
			push(@good_xpds, $xpd);
		}
	}

	my @bri_nt_xpds = grep { $_->type eq 'BRI_NT'; } @good_xpds;
	my @bri_te_xpds = grep { $_->type eq 'BRI_TE'; } @good_xpds;
	my @fxo_xpds = grep { $_->type eq 'FXO'; } @good_xpds;
	my @fxs_xpds = grep { $_->type eq 'FXS'; } @good_xpds;

	# Sync Priority
	return
		@bri_nt_xpds,
		@fxo_xpds,
		@bri_te_xpds,
		@fxs_xpds;
}

sub do_select(@) {
	my $found;

	foreach my $xpd (@_) {
		my $xbus = $xpd->xbus;
		my $busnum = $xbus->name;
		die "Uknown bus name" unless $busnum;
		$busnum =~ s/XBUS-//;
		die "bad bus name" unless $busnum =~ /^\d+$/;
		#printf "Setting sync: %-10s (%s)\n", $xpd->fqn, $xpd->type;
		if(Zaptel::Xpp::sync($busnum)) {
			#print "SET $busnum\n";
			$found = 1;
			last;
		} else {
			print STDERR "Failed to set $busnum: $!\n";
		}
	}
	if(!$found) {
		print STDERR "Fall back to HOST sync\n";
		die "Failed to set HOST sync\n" unless Zaptel::Xpp::sync('HOST');
	}
}

sub do_set($) {
	my $sync = shift;
	die "Failed to set sync to '$sync'" unless Zaptel::Xpp::sync($sync);
}

sub unique_xbus(@) {
	my %seen;

	grep { !$seen{$_->xbus}++; } @_;
}

my $curr_sync = Zaptel::Xpp::sync;
my @sync_xpds = unique_xbus(get_sorted_xpds());

sub show_sync() {
	foreach my $xpd (@sync_xpds) {
		my $xbus = $xpd->xbus;
		my @xpds = $xbus->xpds;
		my @types = map { $_->type } @xpds;
		my $mark = ($curr_sync =~ /\d+/ and $xbus->num == $curr_sync)?"+":"";
		my $xpdstr = '';
		my @xpd_types = map { $_->type } sort { $a->num <=> $b->num } @xpds;
		my $last_type = '';
		my $mult = 0;
		foreach my $curr (@xpd_types) {
			if(!$last_type || ($curr eq $last_type)) {
				$mult++;
			} else {
				if($mult == 1) {
					$xpdstr .= "$last_type ";
				} elsif($mult) {
					$xpdstr .= "$last_type*$mult ";
				}
				$mult = 1;
			}
			$last_type = $curr;
		}
		if($mult == 1) {
			$xpdstr .= "$last_type ";
		} elsif($mult) {
			$xpdstr .= "$last_type*$mult ";
		}
		my $padding = ' ' x (40 - length $xpdstr);
		printf " %1s %s [ %s]%s (%s)\n", $mark, $xbus->name, $xpdstr, $padding, $xbus->connector;
	}
}

sub check_fxo_host_sync() {
	my @host_synced_xpds = grep { $_->xbus->num() ne $curr_sync } @sync_xpds;
	my @host_synced_fxos = grep($_->type eq 'FXO', @host_synced_xpds);
	if(@host_synced_fxos) {
		my @bad_xbus = map { $_->xbus } unique_xbus(@host_synced_fxos);
		our $lines = join("\n\t", map { $_->name } @bad_xbus);
		print STDERR <<"END";
=========================================
WARNING: FXO with HOST SYNC cause bad PCM
	 Affected Astribanks are:
-----------------------------------------
	$lines
=========================================
END
	}
}

if($sync) {
	if($autoselect) {
		do_select(@sync_xpds);
	} else {
		$sync = uc($sync);
		do_set($sync);
	}
	$curr_sync = Zaptel::Xpp::sync;
	#print "New sync: ", Zaptel::Xpp::sync, "\n";
} else {
	print "Current sync: ", $curr_sync, "\n";
	print "Best Available Syncers:\n";
	show_sync;
	check_fxo_host_sync;
}

__END__

=head1 NAME

xpp_sync - Handle sync selection of Xorcom Astribanks.

=head1 SYNOPSIS

xpp_sync [auto|host|nn]

=head1 DESCRIPTION

On a normal operation one Astribank device provides timing for all the
other Astribank devices.

When run without parameters, xpp_sync will display a list of Astribanks
(xbuses) that are connected and registered as Zaptel spans. The current
xpp sync master will be marked (if it is not HOST).

If you this an Astribank is connected and yet it does not appear on the 
output of xpp_sync, it may be unregistered. Try running zt_registration .

=head2 Parameters

=over

=item auto

Automatically selects the best Astribank for syncing (with HOST fallback).

=item host

Set HOST synchronization (XPP timers).

=item nn

Set XBUS number nn as sync source.

=back

=head2 Example output:

	Current sync: 02
	Best Available Syncers:
	 + XBUS-02 [ FXS*3 FXO ]        (usb-0000:00:1d.7-3)
	   XBUS-04 [ FXS*4 ]            (usb-0000:00:1d.7-1)
	   XBUS-03 [ FXS*4 ]            (usb-0000:00:1d.7-2)
	   XBUS-01 [ FXS*4 ]            (usb-0000:00:1d.7-4)
	   XBUS-00 [ FXS*4 ]            (usb-0000:00:1d.7-5)
	   XBUS-05 [ FXS*4 ]            (usb-0000:00:1d.7-6)

In this example we see that the recommended xpp sync master is XBUS-02 - 
it is the first on the list. It is also the actual syncer, as we can see
from the '+' beside it.

=head1 FILES

=over

=item /proc/xpp/sync

xpp_sync is essentially a nicer interface to /proc/xpp/sync . That file
shows the current xpp sync master (and in what format you need to write
to it to set the master).

=back