#!/usr/bin/perl

use strict;
use warnings;

# ----------------------------------------------------------------
# Configuration

#  Add a ascending number after each new translation
# 1: add, 0: don't add
my $numbered=0;

# Add a comment after each new translation.
# This comment contains a combination of translations which are build by using already existing translations.
# 1: add, 0: don't add
my $helper=0; 

# Debug Mode
# Displays additional output for debugging purposes
my $debug=0;


# ----------------------------------------------------------------
# ----- Sub Routines -----

sub readlexicon {
    my $fn=shift;
    open(IN,$fn);
    my %lexicon=();
    my $contents=join('',<IN>);
    close(IN);
    $contents=~s/package Apache\:[^\;]+//;
    $contents=~s/use base[^\;]+//;
    eval($contents.'; %lexicon=%Lexicon;');
    delete $lexicon{'_AUTO'};
    delete $lexicon{'char_encoding'};
    delete $lexicon{'language_code'};
    return %lexicon;
}

sub readnew {
    open(IN,'newphrases.txt');
    my %lexicon=();
    while (my $line=<IN>) {
	chomp($line);
	$lexicon{$line}=$line;
        print "    New entry: $line\n" if $debug;
    }
    close(IN);
    return %lexicon;
}


# ----------------------------------------------------------------
# ----- Main Program -----
my $i;
my $num;
my $dlm;
my $comment;

print "*** Synching Translation Files ***\n";

# Create master hash for the entire set of all translations
print "Building master hash:\n";

# Initialy fill master hash with phrases which are additionally needed/wanted.
print "  Adding new phrases... ";
my %master=&readnew();
print "ok.\n";
  
# Add all the different phrases of all translation files to master hash
foreach (<*.pm>) {
    print "  Reading ".$_." ... ";
    %master=(%master,&readlexicon($_));
   print "ok.\n";
}

# Ignore all phrases found in removephrases.txt for current synchronization.
# These phrases would not be removed from a translation file, if they existed in the file.
# But the phrases will not be added to any translation file even if they were missing in it.
# Remove these obsolete phrases from master hash
print "  Removing obsolete phrases... ";
open(IN,'removephrases.txt');
while (my $line=<IN>) {
    chomp($line);
    delete $master{$line};
}
close(IN);
print "ok.\n";


print "Synchronization:\n";
foreach my $fn (<*.pm>) {
    print "  Synching ".$fn." ... ";
    # Build hash with all translations of current translation file
    my %lang=&readlexicon($fn);
    # Copy current translation file so that the old file could be overwritten with the new content
    # while the copy is used to read from.
    system ("cp $fn $fn.original");
    open(IN,$fn.'.original');
    # Rebuild current translation file
    # by writing all exisiting entries until SYNCMARKER
    open(OUT,'>'.$fn);
    my $found=0;
    while (<IN>) {
	if ($_=~/\#\s*SYNCMARKER/) { $found=1; last; } 
	print OUT $_;
    }
    # Append missing phrases to new version of current translation file
    # by synching old version of current translation file with master hash
    if ($found) {
	$i=0;
	print OUT "\n\#SYNC ".localtime()."\n";
        # Sync master with current translation file:
	foreach my $key (sort keys %master) {
	    unless ($key) { next; }
	    unless ($lang{$key}) {
                print "    Found to be added: $key\n" if $debug;
                if ($helper) {
		    $comment='';
		    my $copytrans=$key;
                    # Create comment based on already existing translations:
		    foreach (reverse sort keys %lang) {
		        $copytrans=~s/\Q$_\E/$lang{$_}/gsi; # \Q \E: escape meta characters
		    }
		    if (lc($copytrans) ne lc($key)) {
		        $comment='# '.$copytrans;
                    }
                }
		if ($numbered) {
		    $i++;
		    $num=' ('.$i.')';
		} else {
		    $num='';
		}
		if ($key=~/\'/) {
		    $dlm='"';
		} else {
		    $dlm="'";
		}
		if ($helper) {
		    print OUT (<<ENDNEW);
   $dlm$key$dlm
=> $dlm$key$num$dlm,
$comment

ENDNEW
		} else {
		    print OUT (<<ENDNEW);
   $dlm$key$dlm
=> $dlm$key$num$dlm,

ENDNEW
		}
	    }
	}

	print OUT "\n\#SYNCMARKER\n";
	foreach (<IN>) {
	    print OUT $_;
	}
    }
    close (IN);
    close (OUT);
    print"ok.\n";
}
print "Synchronization completed.\n";