#!perl -w

use strict;

use FindBin;

use lib "$FindBin::Bin/lib";

use XML::Parser;

use Data::Dumper;

use Text::CSV;

my $sourcesCSV = shift or die "First arg must be source csv file";

my $backupBaseDir = shift or die "Second arg must be path to tree of package_definitions to use if not found in the source packages";

shift and die "No more than two arguments please";

# Load CSV

open my $csvText, "<", $sourcesCSV or die;

my $csv = Text::CSV->new();

my @keys;

my @packages;

while (my $line = <$csvText>)

{

	chomp $line;

	next unless $line;

	unless ($csv->parse($line))

	{

		my $err = $csv->error_input();

		die "Failed to parse line '$line': $err";

	}

	if (! @keys)

	{

		# First line - note the column names

		@keys =  $csv->fields();

	}

	else

	{

		# Already got the keys, so get the data

		my %package;

		# Read into a hash slice

		@package{@keys} = $csv->fields();

		push @packages, \%package;

	}

}

close $csvText;

my $parser = new XML::Parser(Style => "Objects") or die;

my $outTree;

# For each package in CSV...

foreach my $package (@packages)

{

	# If the sources.csv does not include a sys def for this package, it doesn't get built

	next unless $package->{sysdef};

	warn "Warning: Package $package->{dst} does not appear on the local system\n" unless -d $package->{dst};

	# Look for the pkg defn in the root of the package tree

	my $pkgDef = "$package->{dst}/$package->{sysdef}";

	if (!-f $pkgDef)

	{

		# Not there, so try the "backup" location

		$pkgDef =~ s{^/sf/}{};

		$pkgDef =~ s{/[^/]*$}{};

		# TODO: Where will this be on the build machine?

		$pkgDef = "$backupBaseDir/$pkgDef/package_definition.xml";

	}

	die "Unable to locate any package_definition at all for $package->{dst}" unless -f $pkgDef;

	my $pkgTree = eval { $parser->parsefile($pkgDef) } or die "Failed to parse $pkgDef : $@";

	if (!$outTree)

	{

		# The first file is taken verbatim

		$outTree = $pkgTree;

	}

	else

	{

		# Merge into output Tree

		mergeTrees($outTree->[0], $pkgTree->[0]);

	}

}

#print Data::Dumper->Dump([$outTree->[0]], ["tree"]);

# Output total tree

print "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n";

printTree($outTree->[0]);

print "\n";

sub mergeTrees

{

	my $baseTree = shift or die;

	my $extrasTree = shift or die;

	die ("Package Definitions do not match: ".(ref $baseTree)." vs ".(ref $extrasTree)) unless ref $baseTree eq ref $extrasTree;

	return if ref $baseTree eq "main::Characters";

	foreach my $extraChild (@{$extrasTree->{Kids}})

	{

		# Work out whether this child should be merged with a namesake, or appended

		my $mergeIt = undef;

		my $extraChildTag = ref $extraChild;

		$extraChildTag =~ s{^main::}{};

		if ($extraChildTag =~ m{^(SystemDefinition|systemModel)$})

		{

			# Should be merged if there's already one there

#			warn "Always merge $extraChildTag";

			# Look for a namesake in the base

			$mergeIt = matchTag($baseTree->{Kids}, $extraChild, undef);

		}

		elsif ($extraChildTag =~ m{layer|block|package|collection|component})

		{

			# Should be merged if there is another tag with the same "name" attribute

#			warn "Sometimes merge $extraChildTag";

			# Look for a namesake in the base

			$mergeIt = matchTag($baseTree->{Kids}, $extraChild, "name");

		}

		if ($mergeIt)

		{

			# Merge children

			mergeTrees($mergeIt, $extraChild);

		}

		else

		{

			# Add this child

			push @{$baseTree->{Kids}}, $extraChild;

		}

	}

}

sub matchTag

{

	my $peers = shift;

	my $outsider = shift;

	my $attr = shift;

	foreach my $peer (@$peers)

	{

		if (ref $peer eq ref $outsider && (!defined $attr || $peer->{$attr} eq $outsider->{$attr}))

		{

			return $peer;

		}

	}

	return undef;

}

sub printTree

{

	my $tree = shift or die;

	die unless ref $tree;

	my $tagName = ref $tree;

	$tagName =~ s{^main::}{};

	if ($tagName eq "Characters")

	{

		print $tree->{Text};

		return;

	}

	print "<$tagName";

	foreach my $attr (grep { ! ref $tree->{$_} } keys %$tree)

	{

		print " $attr=\"$tree->{$attr}\"";

	}

	my $children = $tree->{Kids};

	if (scalar @$children)

	{

		print ">";

		foreach my $child (@$children)

		{

			printTree($child);

		}

		print "</$tagName";

	}

	else

	{

		print "/"

	}

	print ">";

}