#! /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/perl_modules"); }

use Getopt::Long;
use Dahdi;
use Dahdi::Xpp;
use Dahdi::Config::Gen;
use Dahdi::Config::Params;

Getopt::Long::Configure ("bundling");

my $version = '1';	# Functionality version (integer)
my $revision = '$Revision$';

my %opts;

sub usage {
	warn "Usage: $0 [options] <generators>\n";
	warn "          Options:\n";
	warn "            --line-mode=<E1|T1|J1>   - Also generate span-types.conf with default line mode\n";
	warn "            -F|--freepbx             - Modify configuration for Freepbx (skip FXS channels)\n";
	warn "            -v|--verbose             - Be versbose, show generated files\n";
	warn "            -V|--version             - Show version and exit\n";
	warn "            -h|--help                - Show this message\n";
	exit 1;
}

sub set_defaults {
	my $default_file = $ENV{GENCONF_PARAMETERS} || "/etc/dahdi/genconf_parameters";
	my $params = Dahdi::Config::Params->new($default_file);
	#$params->dump;
	if($opts{v}) {
		print "Default parameters from ", $params->{GENCONF_FILE}, "\n";
	}
	my $gconfig = Dahdi::Config::Gen->new($params);
	#$gconfig->dump;
	return $gconfig;
}

sub spans_prep($@) {
	my $gconfig = shift || die;
	my @spans = @_;
	foreach my $span (@spans) {
		if($span->is_pri || $span->is_bri) {
			$span->pri_set_fromconfig($gconfig);
		}
	}
}

sub munge_spantypes {
	if ($opts{'line-mode'}) {
		print "Will generate span-types.conf with line-mode=$opts{'line-mode'}\n"
			if $opts{'verbose'};
		return "spantypes=line-mode=$opts{'line-mode'}";
	} else {
		print "Will generate span-types.conf\n" if $opts{'verbose'};
		return "spantypes";
	}
}

sub generator_list($) {
	my $gconfig = shift || die;
	my @genlist;

	if (@ARGV) {
		for my $gen (@ARGV) {
			$gen = munge_spantypes() if $gen eq 'spantypes';
			push @genlist, $gen;
		}
	} else {
		# No files given. Use the defaults.
		@genlist = ('assignedspans', 'system', 'chandahdi');
		if($gconfig->{'pri_connection_type'} eq 'R2') {
			push @genlist, 'unicall';
		}
		push(@genlist, munge_spantypes()) if $opts{'line-mode'};
	}
	return @genlist;
}

sub parse_genopts($) {
	my $optstr = shift;
	my %genopts;

	$optstr = '' unless defined $optstr;
	foreach my $o (split(/,/, $optstr)) {
		my ($k, $v) = split(/=/, $o, 2);
		$v = 1 unless defined $v and $v;
		$genopts{$k} = $v;
	}
	return %genopts;
}

sub generate_files($@) {
	my $gconfig = shift || die;
	my @spans = @_;
	my @generators = generator_list($gconfig);

	for my $gen (@generators) {
		my ($name, $optstr) = split(/=/, $gen, 2);
		die "Illegal name '$name'\n" unless $name =~ /^\w+$/;
		$name =~ s/(.)(.*)/\u$1\L$2/;
		my %genopts = parse_genopts($optstr);
		$genopts{'freepbx'} = 'yes' if $opts{'F'};
		if(defined $opts{'v'}) {
			$genopts{'verbose'} = $opts{v};
		}
		$gconfig->run_generator($name, \%genopts, @spans);
	}
}

GetOptions(\%opts,
		"line-mode=s",
		"h|help",
		"v|verbose",
		"V|version",
		"F|freepbx",
	) or usage;

usage if $opts{h};

if($opts{'V'}) {
	my $revstr = $revision;
	$revstr =~ s/[^$]*\$[^:]+:\s*//;
	$revstr =~ s/\s*\$.*//;
	print "$0: version=$version revision=$revstr\n";
	exit 0;
}

my $gconfig = set_defaults;
my @spans = Dahdi::spans();
spans_prep($gconfig, @spans);
generate_files($gconfig, @spans);

__END__

=head1 NAME

dahdi_genconf - Generate configuration for Dahdi channels.

=head1 SYNOPSIS

dahdi_genconf [options] [generator...]

=head1 DESCRIPTION

This script generate configuration files for Dahdi hardware.
It uses two information sources:

=over 4

=item Hardware

 The actual Dahdi hardware is automatically detected on the host.

=item /etc/dahdi/genconf_parameters

A configuration file that supplements the hardware information.
Its location may be overridden via the C<GENCONF_PARAMETERS> environment
variable.

=back

The dahdi_genconf script can generate various kinds of configuration files
as specified by the generator arguments.  Each generator is a perl class
in Dahdi::Config::Gen namespace.  The generator names on the command line
are the class names in lowercase.

The following generators are currently implemented: system, modules, spantypes,
assignedspans, chandahdi, unicall, users.

For further documentation on each, please user perldoc on the relevant
class. E.g: C<perldoc Dahdi::Config::Gen::Chandahdi>

Each generator on the command line may be passed custom options by assigning
a comma separated list of options to the generator name. E.g:

 dahdi_genconf system chandahdi=verbose unicall

=head2 Global options:

=over 4

=item -V --version

Version -- print version string and exit.

=item -v --verbose

Verbose -- sets the C<'verbose'> option for all generators.

=item -F --freepbx

Freepbx -- sets the C<'freepbx'> option for all generators.
Currently, chandahdi is affected.

=item --line-mode=I<mode>

I<mode> may be E1, J1 or T1.

Enables the generator B<spantypes> and the option B<line-mode> to it.
(Equivalent to the option C<--line-mode> to C<dahdi_span_types>). This
will generate a C<span-types.conf> file with a single wildcard line
setting the line mode to I<mode>.

=back

=head2 Implementation notes:

=over 4

=item *

F<genconf_parameters> parsing is done via C<Dahdi::Config::Params>.
An object representing the parsed data is instantiated by:
C<Dahdi::Config::Params-E<gt>new()>.
The C<item()> method of this object contains all the hard coded
defaults of the configuration directives.

=item *

A configuration object is instantiated by C<Dahdi::Config::Gen-E<gt>new($params)>.
The mapping of configuration directives into semantic configuration is
done in the constructor.

=item *

A single generator is run via the the C<run_generator()> method of the
configuration object.

=back