#!/usr/bin/perl
# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html

# Builds the xCAT-OpenStack database table man pages from the descriptions that are contained
# in the Cloud.pm schema plugin.  This script is run during the build of the xCAT-OpenStack rpm, but
# is not packaged in the binary form of that rpm.

# This script is run in the xCAT-OpenStack subdir of the rpm build directory, so everything is
# done relative to that.

# The overview of what this script does is:
# - get the table descriptions from lib/perl/xCAT_schema/Clouds.pm and create a summary man page
# - iterate thru the tables in lib/perl/xCAT_schema/Clouds.pm and create pods for each
# - use the pod2man to convert them to man pages
# - use the pod2html to convert them to html pages

use strict;
use lib 'lib/perl';

use xCAT_schema::Clouds;
#use xCAT::Table;
use Pod::Man;
use Pod::Html;

my $VERBOSE = 1;		# set this to 1 for debugging
my $poddir = 'pods';
my $mandir = 'share/man';
my $htmldir = 'share/doc';
my $cachedir = '/tmp';

my $poddir5 = 'pods/man5';
my $poddir7 = 'pods/man7';
if (system("mkdir -p $poddir5")) { die "Error: could not create $poddir5.\n"; }
if (system("mkdir -p $poddir7")) { die "Error: could not create $poddir7.\n"; }

# Build the DB overview page.
print "Building PODs pages for the database tables...\n";
writesummarypage("$poddir5/xcat-openstack-db.5.pod", getTableDescriptions(), getDefRef());

# Build the pod man page for each object definition
my $defspecref = getDefRef();
foreach my $defkey (keys %$defspecref) {
	my $def = $defspecref->{$defkey};
	my $attrs = $def->{'attrs'};
	my $podfile = "$poddir7/$defkey.7.pod";
	verbose("Writing pod file for $defkey");
    writedefmanpage($podfile, $defkey, $attrs);
}

# Build the pod man page for each table.
my $tabspecref = getTableRef();
foreach my $tablekey (keys %$tabspecref) {
    my $table = $tabspecref->{$tablekey};
    my $summary = $table->{table_desc};
    my $colorder = $table->{cols};
    my $descriptions = $table->{descriptions};
	verbose("Writing pod file for $tablekey");
    writepodmanpage("$poddir5/$tablekey.5.pod", $tablekey, $summary, $colorder, $descriptions);
}

my @pods = getPodList($poddir);
verbose('Pod list:' . "@pods");

# Build the man page for each pod.
print "Converting PODs to man pages...\n";
foreach my $podfile (@pods) {
    my $manfile = $podfile;
    $manfile =~ s/^$poddir/$mandir/;      # change the beginning of the path
    $manfile =~ s/\.pod$//;			# change the ending
    my $mdir = $manfile;
    $mdir =~ s|/[^/]*$||;			# get rid of the basename part
	if (system("mkdir -p $mdir")) { die "Error: could not create $mdir.\n"; }
	my ($section) = $podfile =~ /\.(\d+)\.pod$/;
	verbose("Converting $podfile to $manfile");
    convertpod2man($podfile, $manfile, $section);
}

my @dummyPods = createDummyPods($poddir);

# Build the html page for each pod.
print "Converting PODs to HTML pages...\n";
# have to clear the cache, because old entries can cause a problem
unlink("$cachedir/pod2htmd.tmp", "$cachedir/pod2htmi.tmp");
foreach my $podfile (@pods) {
    my $htmlfile = $podfile;
    $htmlfile =~ s/^$poddir/$htmldir/;      # change the beginning of the path
    $htmlfile =~ s/\.pod$/\.html/;			# change the ending
    my $hdir = $htmlfile;
    $hdir =~ s|/[^/]*$||;			# get rid of the basename part
	if (system("mkdir -p $hdir")) { die "Error: could not create $hdir.\n"; }
	verbose("Converting $podfile to $htmlfile");
    convertpod2html($podfile, $htmlfile, $poddir, $htmldir);
}

unlink @dummyPods;

exit;

# if VERBOSE is on, print out the given string
sub verbose { if ($VERBOSE) { print $_[0], "\n"; } }

sub getDefRef { return \%xCAT_schema::Clouds::defspec; }

sub getTableRef { return \%xCAT_schema::Clouds::tabspec; }

# Returns a list of the table names in the xCAT database.
sub getTableList { return keys %xCAT_schema::Clouds::tabspec; }

# Returns a reference to the db schema hash for the specified table.
sub getTableSchema { return $xCAT_schema::Clouds::tabspec{$_[0]}; }

# Return a reference to a hash where each key is the table name and each value is the table description.
sub getTableDescriptions {
	# List each table name and the value for table_desc.
	my $ret = {};
	#my @a = keys %{$xCAT_schema::Clouds::tabspec{nodelist}};  print 'a=', @a, "\n";
	foreach my $t (getTableList()) { $ret->{$t} = getTableSchema($t)->{table_desc}; }
	return $ret;
}


# Recursively get the list of pod man page files.
sub getPodList {
	my $poddir = shift;
	my @files;

	# 1st get toplevel dir listing
	opendir(DIR, $poddir) or die "Error: could not read $poddir.\n";
	my @topdir = grep !/^\./, readdir(DIR);		# /
	close(DIR);

	# Now go thru each subdir (these are man1, man3, etc.)
	foreach my $mandir (@topdir) {
		opendir(DIR, "$poddir/$mandir") or die "Error: could not read $poddir/$mandir.\n";
		my @dir = grep !/^\./, readdir(DIR);		# /
		close(DIR);
		foreach my $file (@dir) {
			push @files, "$poddir/$mandir/$file";
		}
	}
	return sort @files;
}


# Create the html page for one pod.
sub convertpod2html {
	my ($podfile, $htmlfile, $poddir, $htmldir) = @_;

	#TODO: use --css=<stylesheet> and --title=<pagetitle> to make the pages look better
	pod2html($podfile,
			"--outfile=$htmlfile",
			"--podpath=man5:man7",
			"--podroot=$poddir",
			"--htmldir=$htmldir",
			"--recurse",
			"--cachedir=$cachedir",
			);

}


# Create the man page for one pod.
sub convertpod2man {
	my ($podfile, $manfile, $section) = @_;

	my $parser = Pod::Man->new(section => $section);
    $parser->parse_from_file($podfile, $manfile);
}


# Create the xcat-openstack-db man page that gives a summary description of each table.
sub writesummarypage {
	my $file = shift;       # relative path file name of the man page
	my $descriptions = shift;	# a hash containing the description of each table
	my $defdescriptions = shift;	# a hash containing the description of each object definition

	open(FILE, ">$file") or die "Error: could not open $file for writing.\n";

	print FILE <<'EOS1';
=head1 NAME

An overview of the xCAT OpenStack database objects and tables.

=head1 DESCRIPTION

The xCAT OpenStack database objects and tables contain user settings for the OpenStack cloud being set up by xCAT.
To get more information about a particular table, run man for that table name.
The tables and objects can be viewed using B<tabdump>, B<nodels>, or B<lsdef>.
The tables and objects can be manipulated directly using B<tabedit>, B<nodech>, or B<chdef>.
For more information about the xCAT database and the base tables and objects, see the L<xcatdb(5)|xcatdb.5> man page.

=head1 XCAT OPENSTACK OBJECT DEFINITIONS

Because it can get confusing what attributes need to go in what tables, the xCAT database can also
be viewed and edited as logical objects, instead of flat tables.  Use B<mkdef>, B<chdef>, B<lsdef>,
and B<rmdef> to create, change, list, and delete objects.
When using these commands, the object attributes will be stored in the same tables, as if you edited
the tables by hand.  The only difference is that the object commands take care of knowing which tables
all of the information should go in.

To run man for any of the object definitions below, use section 7.  For example:  B<man 7 node>

The object types are:

=over 2
EOS1

foreach my $def (sort keys %$defdescriptions) {
	if ($def eq 'node') { print FILE "\n=item L<$def(7)|node-openstack.7>\n"; }		# can not overwrite the node man page in xcat-core
	else { print FILE "\n=item L<$def(7)|$def.7>\n"; }
}

	print FILE <<"EOS2";

=back

=head1 TABLES

To manipulate the tables directly, use B<nodels(1)>, B<chtab(8)>, B<tabdump(8)>, B<tabedit(8)>,
B<nodeadd(8)>, B<nodech(1)>.

To run man for any of the table descriptions below, use section 5.  For example:  B<man 5 nodehm>

The tables are:

=over 2
EOS2

foreach my $table (sort keys %$descriptions) {
	print FILE "\n=item L<$table(5)|$table.5>\n\n".$descriptions->{$table}."\n";
}

	print FILE <<"EOS3";

=back

=head1 SEE ALSO

B<nodels(1)>, B<chtab(8)>, B<tabdump(8)>, B<tabedit(8)>, B<lsdef(1)>, B<mkdef(1)>, B<chdef(1)>, B<rmdef(1)>
EOS3

	close FILE;
}


# Create the man page for one object definition.
sub writedefmanpage {
	my $file = shift;       # relative path file name of the man page
	my $defname = shift;		# name of object
	my $attrs = shift;		# reference to the array of attributes

	# Make exception for the node object, because we can not overwrite the node man page from xcat-core
	if ($defname eq 'node') { $file = "$poddir7/node-openstack.7.pod"; }

	# Go thru the attributes, collecting the descriptions
	# Note:  this logic is loosely taken from DBobjectdefs.pm
	my %attrlist;		# holds the attr name as the key, and the description & tables as value
	foreach my $this_attr (@$attrs) {
        my $attr = $this_attr->{attr_name};
        my $desc = $this_attr->{description};
        my ($table, $at) = split(/\./, $this_attr->{tabentry});
        if (!defined($desc)) {
			# description key not there, so go to the corresponding
			#	entry in tabspec to get the description
            my $schema = getTableSchema($table);
            $desc = $schema->{descriptions}->{$at};
        }

		# Attr names can appear more than once, if they are in multiple tables.
		# We will keep track of that based on the table attribute, because that can be duplicated too
		if (!defined($attrlist{$attr})) {
			$attrlist{$attr}->{'tables'} = [];		# initialize the array, so we can check it below
		}
		my $tableattr = "$table.$at";
		if (!grep(/^$tableattr$/, @{$attrlist{$attr}->{'tables'}})) {
			# there can be multiple entries that refer to the same table attribute
			# if this is a new table attribute, then save the attr name and description
			push @{$attrlist{$attr}->{'tables'}}, $tableattr;
			push @{$attrlist{$attr}->{'descriptions'}}, $desc;
		}
	}

	open(FILE, ">$file") or die "Error: could not open $file for writing.\n";

	print FILE <<"EOS1";
=head1 NAME

B<$defname> - a logical object definition in the xCAT database.

=head1 SYNOPSIS

EOS1

	print FILE "B<$defname Attributes:>  I<" . join('>, I<',sort(keys(%attrlist))) . ">\n";

	print FILE <<"EOS2";

=head1 DESCRIPTION

Logical objects of this type are stored in the xCAT database in one or more tables.  Use the following commands
to manipulate the objects: B<mkdef>, B<chdef>, B<lsdef>, and B<rmdef>.  These commands will take care of
knowing which tables the object attributes should be stored in.  The attribute list below shows, in
parentheses, what tables each attribute is stored in.

=head1 $defname Attributes:

=over 6

EOS2

foreach my $a (sort keys %attrlist) {
	my $d = join("\nor\n", @{$attrlist{$a}->{'descriptions'}});
	$d =~ s/\n/\n\n/sg;      # if there are newlines, double them so pod sees a blank line, otherwise pod will ignore them
	my $t = '(' . join(', ',@{$attrlist{$a}->{'tables'}}) . ')';
	#print FILE "\nB<$a> - $d\n";
	print FILE "\n=item B<$a> $t\n\n$d\n";
}

	print FILE <<"EOS3";

=back

EOS3

if ($defname eq 'node') {
	print FILE "B<The node attributes listed above are just the ones that the xCAT-OpenStack RPM adds to the node object definition.  For the rest of the node attributes from xcat-core, see the L<node(7)|node.7> man page.>\n\n";
}

	print FILE <<"EOS4";
=head1 SEE ALSO

B<mkdef(1)>, B<chdef(1)>, B<lsdef(1)>, B<rmdef(1)>
EOS4

	close FILE;
}


# Create the man page for one table.
sub writepodmanpage {
	my $file = shift;       # relative path file name of the man page
	my $tablename = shift;		# name of table
	my $summary = shift;		# description of table
	my $colorder = shift;		# the order in which the table attributes should be presented in
	my $descriptions = shift;	# a hash containing the description of each attribute

	open(FILE, ">$file") or die "Error: could not open $file for writing.\n";

	print FILE <<"EOS1";
=head1 NAME

B<$tablename> - a table in the xCAT database.

=head1 SYNOPSIS

EOS1

	print FILE "B<$tablename Attributes:>  I<" . join('>, I<',@$colorder) . ">\n";

	print FILE <<"EOS2";

=head1 DESCRIPTION

$summary

=head1 $tablename Attributes:

=over 10

EOS2

foreach my $a (@$colorder) {
	my $d = $descriptions->{$a};
	#$d =~ s/\n/\n\n/sg;      # if there are newlines, double them so pod sees a blank line, otherwise pod will ignore them
	#print FILE "\nB<$a> - $d\n";
	print FILE "\n=item B<$a>\n\n$d\n";
}

	print FILE <<"EOS3";

=back

=head1 SEE ALSO

B<nodels(1)>, B<chtab(8)>, B<tabdump(8)>, B<tabedit(8)>
EOS3

	close FILE;
}


# To enable linking between the man pages in xCAT-OpenStack and the xcat-core man pages
# we need to create an empty one that will satisfy pod2html.
# Returns all dummy pods created, so they can be removed later
sub createDummyPods {
	my $poddir = shift @_;

	# Also add xcattest.1.pod and buildkit.1.pod, because the xcat.1.pod summary page refers to it
	push @dummyPods, "$poddir/man7/node.7.pod";
	push @dummyPods, "$poddir/man5/xcatdb.5.pod";
	
	# Create these empty files
	print "Creating empty linked-to files: ", join(', ', @dummyPods), "\n";
	#mkdir "$poddir/man7";
	foreach my $d (@dummyPods) {
		if (!open(TMP, ">>$d")) { warn "Could not create dummy pod file $d ($!)\n"; }
		else { close TMP; }
	}
	
	return @dummyPods;
}