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#!/usr/bin/perl -s -w
#             __________               __   ___.
#   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
#   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
#   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
#   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
#                     \/            \/     \/    \/            \/
#
# Copyright (C) 2020 Solomon Peachy
#

use utf8;
use File::Basename;

sub trim {
    my ($string) = @_;
    $string =~ s/^\s+//;
    $string =~ s/\s+$//;
    return $string;
}

sub parselangfile {
    my ($filename) = @_;
    my %phrases;
    my @order;
    my %empty = ( #'phrase' => {},
		  #'source' => {},
		  #'dest' => {},
		  #'voice' => {},
		  'notes' => "",
		  'new' => 0
	);
    my %thisphrase = %empty;

    open(FH, "<$filename") || die ("Can't open $filename");
    my @lines = <FH>;
    close(FH);

    my $pos = 'lang';
    my $id = '';
    my @comments;

    foreach my $line (@lines) {
	$line = trim($line);
        if($line =~ /^ *#/) {
	    push(@comments, "$line\n") if ($pos eq 'lang');
            # comments are ignored!
            next;
        } elsif ($pos eq 'phrase' && $line =~ /^([^:]+): ?(.*)$/) {
	    $thisphrase{$pos}->{$1} = $2;
	    if ($1 eq 'id') {
		push(@order, $2);
		$id = $2;
	    }
	} elsif ($pos ne 'phrase' && $line =~ /^([^:]+): ?\"?([^\"]*)\"?$/) {
	    my @targets = split(',', $1);
	    foreach (@targets) {
		my $l = trim($_);
		$thisphrase{$pos}->{$l} = $2;
	    }
	}
	if ($line eq '</voice>' ||
	    $line eq '</dest>' ||
	    $line eq '</source>' ||
	    $line eq '<phrase>') {
	    $pos = 'phrase';
	} elsif ($line eq '</phrase>') {
	    my %copy = %thisphrase;
	    $phrases{$id} = \%copy;
	    %thisphrase = %empty;
	    $pos = 'lang';
	    $id = '';
	} elsif ($line eq '<source>') {
	    $pos = 'source';
	} elsif ($line eq '<dest>') {
	    $pos = 'dest';
	} elsif ($line eq '<voice>') {
	    $pos = 'voice';
	}
    }
    $phrases{'HEADER'} = \@comments;
    $phrases{'ORDER'} = \@order;
    return %phrases;
}

sub combinetgts {
    my (%tgtmap) = (@_);
    my %strmap;
    my %combined;

    # Reverse-map things
    foreach my $tgt (sort(keys(%tgtmap))) {
	next if ($tgt eq '*');  # Do not combine anything with fallback
	if (defined($strmap{$tgtmap{$tgt}})) {
	    $strmap{$tgtmap{$tgt}} .= ",$tgt";
	} else {
	    $strmap{$tgtmap{$tgt}} = "$tgt";
	}
    }

    # Copy over default/fallback as it was skipped
    $combined{'*'} = $tgtmap{'*'};

    foreach my $str (keys(%strmap)) {
	$combined{$strmap{$str}} = $str;
    }

    return %combined;
}

my @ignorelist = split("\n",
"LANG_SERIAL_BITRATE_19200
LANG_SERIAL_BITRATE_9600
LANG_SERIAL_BITRATE_38400
LANG_SERIAL_BITRATE_57600
LANG_COMPRESSOR_RATIO_10
LANG_COMPRESSOR_RATIO_2
LANG_COMPRESSOR_RATIO_6
LANG_COMPRESSOR_RATIO_4
LANG_ROCKBOX_TITLE
LANG_EQUALIZER_BAND_Q
LANG_FM_DEFAULT_PRESET_NAME
LANG_DISK_NAME_MMC
LANG_COLOR_RGB_LABELS
LANG_BYTE
LANG_KIBIBYTE
LANG_GIBIBYTE
LANG_USB_HID
VOICE_ZERO
VOICE_ONE
VOICE_TWO
VOICE_THREE
VOICE_FOUR
VOICE_FIVE
VOICE_SIX
VOICE_SEVEN
VOICE_EIGHT
VOICE_NINE
VOICE_TEN
VOICE_ELEVEN
VOICE_TWELVE
VOICE_THIRTEEN
VOICE_FOURTEEN
VOICE_FIFTEEN
VOICE_SIXTEEN
VOICE_SEVENTEEN
VOICE_EIGHTEEN
VOICE_NINETEEN
VOICE_TWENTY
VOICE_THIRTY
VOICE_FORTY
VOICE_FIFTY
VOICE_SIXTY
VOICE_SEVENTY
VOICE_EIGHTY
VOICE_NINETY
VOICE_CHAR_A
VOICE_CHAR_B
VOICE_CHAR_C
VOICE_CHAR_D
VOICE_CHAR_E
VOICE_CHAR_F
VOICE_CHAR_G
VOICE_CHAR_H
VOICE_CHAR_I
VOICE_CHAR_J
VOICE_CHAR_K
VOICE_CHAR_L
VOICE_CHAR_M
VOICE_CHAR_N
VOICE_CHAR_O
VOICE_CHAR_P
VOICE_CHAR_Q
VOICE_CHAR_R
VOICE_CHAR_S
VOICE_CHAR_T
VOICE_CHAR_U
VOICE_CHAR_V
VOICE_CHAR_W
VOICE_CHAR_X
VOICE_CHAR_Y
VOICE_CHAR_Z
VOICE_PAUSE");

sub not_ignorelist {
    my ($key) = @_;
    foreach (@ignorelist) {
	if ($_ eq $key) {
	    return 0;
	}
    }
    return 1;
}
##################

if($#ARGV != 2) {
    print "Usage: updatelang <english.lang> <otherlang> [<outfile>|-]\n";
    exit;
}

# Parse master file
my %english = parselangfile($ARGV[0]);
my @englishorder = @{$english{'ORDER'}};

# Parse secondary file
my %lang = parselangfile($ARGV[1]);
my @langorder = @{$lang{'ORDER'}};
my @langheader = @{$lang{'HEADER'}};

# Clean up
delete $english{'ORDER'};
delete $english{'HEADER'};
delete $lang{'ORDER'};
delete $lang{'HEADER'};

# ork out the missing phrases
my %missing;
my @missingorder;

foreach (@englishorder) {
    $missing{$_} = 1;
}
foreach (@langorder) {
    if (!defined($english{$_})) {
	delete($lang{$_});
#	print "#!! '$_' no longer needed\n";
	next;
    }
    delete $missing{$_};
}
foreach (@englishorder) {
    push(@missingorder, $_) if defined($missing{$_});
}
# And add them to the phrase list.
foreach (@missingorder) {
#    print "#!! '$_' missing\n";
    push(@langorder, $_);
    $lang{$_} = $english{$_};
    $lang{$_}{'notes'} .= "### This phrase is missing entirely, copying from english!\n";
    $lang{$_}{'new'} = 1;
}
undef @missingorder;
undef %missing;

# Sanity-check a few things
foreach my $id (@langorder) {
    if (!defined($english{$id})) {
	next;
    }
    my %ep = %{$english{$id}{'phrase'}};
    my %lp = %{$lang{$id}{'phrase'}};

    if ($lp{'desc'} ne $ep{'desc'}) {
	if ($ep{'desc'} eq 'deprecated') {
	    # Nuke all deprecated targets; just copy from English
#	    print "#!! '$id' deprecated, deleting\n";
	    $lang{$id} = $english{$id};
	} else {
	    $lang{$id}{'notes'} .= "### The 'desc' field for '$id' differs from the english!\n### the previously used desc is commented below:\n### desc: $lp{desc}\n";
	    $lang{$id}{'phrase'}{'desc'} = 	$english{$id}{'phrase'}{'desc'};
	    #	print "#!! '$id' changed description\n";
	}
    }

    if (!defined($lp{'user'}) || $lp{'user'} ne $ep{'user'}) {
	if (!defined($lp{'user'})) {
	    $lp{'user'} = $ep{'user'};
	}
	$lang{$id}{'notes'} .= "### The 'user' field for '$id' differs from the english!\n### the previously used desc is commented below:\n### desc: $lp{user}\n";
	$lang{$id}{'phrase'}{'user'} = $english{$id}{'phrase'}{'user'};
#	print "#!! '$id' changed user\n";
    }
}

# Check sources
foreach my $id (@langorder) {
    if (!defined($english{$id})) {
	next;
    }
    my %ep = %{$english{$id}{'source'}};
    my %lp;

    if (defined($lang{$id}{'source'})) {
	%lp = %{$lang{$id}{'source'}};
    } else {
	%lp = ();
    }

    foreach my $tgt (keys(%lp)) {
	if (!defined($ep{$tgt})) {
	    # Delete any targets that have been nuked in master
	    delete($lang{$id}{'source'}{$tgt});
	}
    }
    foreach my $tgt (keys(%ep)) {
	if (!defined($lp{$tgt})) {
	    # If it doesn't exist in the language, copy it from English
	    if ($ep{$tgt} ne 'none' && $ep{$tgt} ne '' ) {
		$lang{$id}{'notes'} .= "### The <source> section for '$id:$tgt' is missing! Copying from english!\n";
#		print "#!! '$id:$tgt' source missing\n";
	    }
	    $lang{$id}{'source'}{$tgt} = $english{$id}{'source'}{$tgt};
	} elsif ($lp{$tgt} ne $ep{$tgt}) {
	    # If the source string differs, complain, and copy from English
	    $lang{$id}{'notes'} .= "### The <source> section for '$id:$tgt' differs from the english!\n";
	    $lang{$id}{'notes'} .= "### the previously used one is commented below:\n";
            $lang{$id}{'notes'} .= "### $english{$id}{source}{$tgt}\n";
#	    print "#!! '$id:$tgt' source changed ('$lp{$tgt}' vs '$ep{$tgt}')\n";
	    $lang{$id}{'source'}{$tgt} = $english{$id}{'source'}{$tgt};
	}
    }
}

# Check dests
foreach my $id (@langorder) {
    if (!defined($english{$id})) {
	next;
    }
    my %ep = %{$english{$id}{'dest'}};
    my %lp;

    if (defined($lang{$id}{'dest'})) {
	%lp = %{$lang{$id}{'dest'}};
    } else {
	%lp = ();
    }

    foreach my $tgt (keys(%lp)) {
	if (!defined($ep{$tgt})) {
	    # Delete any targets that have been nuked in master
	    delete($lang{$id}{'dest'}{$tgt});
	}
    }
    foreach my $tgt (keys(%ep)) {
	if (!defined($lp{$tgt})) {
	    # If it doesn't exist in the language, copy it from English
	    if ($ep{$tgt} ne 'none' && $ep{$tgt} ne '' ) {
		$lang{$id}{'notes'} .= "### The <dest> section for '$id:$tgt' is missing! Copying from english\n";
#		print "#!! '$id:$tgt' dest missing\n";
	    }
	    $lang{$id}{'dest'}{$tgt} = $english{$id}{'dest'}{$tgt};
	} elsif ($lp{$tgt} ne $ep{$tgt}) {
	    # If the source string differs, complain, and copy from English
	    if ($lp{$tgt} eq '' && $ep{$tgt} ne '') {
		$lang{$id}{'notes'} .= "### The <dest> section for '$id:$tgt' is blank! Copying from english!\n";
#		print "#!! '$id:$tgt' dest is blank ('$lp{$tgt}' vs '$ep{$tgt}')\n";
		$lang{$id}{'dest'}{$tgt} = $english{$id}{'dest'}{$tgt};
	    } elsif ($lp{$tgt} ne '' && $ep{$tgt} eq '') {
		# It should be kept blank!
		$lang{$id}{'notes'} .= "### The <dest> section for '$id:$tgt' is not blank!\n";
		$lang{$id}{'notes'} .= "### the previously used one is commented below:\n";
		$lang{$id}{'notes'} .= "### $english{$id}{dest}{$tgt}\n";
#		print "#!! '$id:$tgt' dest not blank ('$lp{$tgt}' vs '$ep{$tgt}')\n";
		$lang{$id}{'dest'}{$tgt} = $english{$id}{'dest'}{$tgt};
	    }
	} elsif ($lp{$tgt} ne 'none' && $lp{$tgt} ne '' && not_ignorelist($id) && !$lang{$id}{'new'}) {
	    $lang{$id}{'notes'} .= "### The <dest> section for '$id:$tgt' is identical to english!\n";
#	    print "#!! '$id:$tgt' dest identical ('$lp{$tgt}')\n";
	}
    }
}

# Check voices
foreach my $id (@langorder) {
    if (!defined($english{$id})) {
	next;
    }
    my %ep = %{$english{$id}{'voice'}};
    my %lp;

    if (defined($lang{$id}{'voice'})) {
	%lp = %{$lang{$id}{'voice'}};
    } else {
	%lp = ();
    }

    foreach my $tgt (keys(%lp)) {
	if (!defined($ep{$tgt})) {
	    # Delete any targets that have been nuked in master
	    delete($lang{$id}{'voice'}{$tgt});
	}
    }
    foreach my $tgt (keys(%ep)) {
	if (!defined($lp{$tgt})) {
	    # If it doesn't exist in the language, copy it from English
	    if ($ep{$tgt} ne 'none' && $ep{$tgt} ne '' ) {
		$lang{$id}{'notes'} .= "### The <voice> section for '$id:$tgt' is missing! Copying from english\n";
#		print "#!! '$id:$tgt' voice missing\n";
	    }
	    $lang{$id}{'voice'}{$tgt} = $english{$id}{'voice'}{$tgt};
	} elsif ($lp{$tgt} ne $ep{$tgt}) {
	    if ($lp{$tgt} eq '' && $ep{$tgt} ne '') {
		# If the lang voice string is blank, complain, and copy from English
		$lang{$id}{'notes'} .= "### The <voice> section for '$id:$tgt' is blank! Copying from english!\n";
#		print "#!! '$id:$tgt' voice is blank ('$lp{$tgt}' vs '$ep{$tgt}')\n";
		$lang{$id}{'voice'}{$tgt} = $english{$id}{'voice'}{$tgt};
	    } elsif ($lp{$tgt} ne '' && $ep{$tgt} eq '') {
		# If it's not blank, clear it and complain!
		$lang{$id}{'notes'} .= "### The <voice> section for '$id:$tgt' is not blank!\n";
		$lang{$id}{'notes'} .= "### the previously used one is commented below:\n";
		$lang{$id}{'notes'} .= "### $english{$id}{voice}{$tgt}\n";
#		print "#!! '$id:$tgt' voice not blank ('$lp{$tgt}' vs '$ep{$tgt}')\n";
		$lang{$id}{'voice'}{$tgt} = $english{$id}{'voice'}{$tgt};
	    }
	} elsif ($lp{$tgt} ne 'none' && $lp{$tgt} ne '' && not_ignorelist($id) && !$lang{$id}{'new'}) {
	    $lang{$id}{'notes'} .= "### The <voice> section for '$id:$tgt' is identical to english!\n";
#	    print "#!! '$id:$tgt' voice identical ('$lp{$tgt}')\n";
	}
    }
}

########## Write new language file
my $printnotes = 1;

#my @tmp = split(/\./, basename($ARGV[0]));
#my $f1 = $tmp[0];
#@tmp = split(/\./, basename($ARGV[1]));
#my $f2 = $tmp[0];
#
#if (index($f2, $f1) > -1) {
#    $printnotes = 0;
#}
#undef $f1;
#undef $f2;
#undef @tmp;

my $fh;
if ($ARGV[2] ne '-') {
    open(FH, ">$ARGV[2]") || die ("Can't open $ARGV[2]");
    $fh = *FH;
} else {
    $fh = *STDOUT;
}

foreach (@langheader) {
    print $fh $_;
}

my @finalorder = @langorder;  # TODO make configurable vs @englishorder
foreach my $id (@finalorder) {
    if (!defined($english{$id})) {
	next;
    }
    my %lp;

    # phrase
    %lp = %{$lang{$id}{'phrase'}};
    if (length($lang{$id}{'notes'}) && $printnotes) {
	print $fh "$lang{$id}{notes}";
    }
    print $fh "<phrase>\n";
    print $fh "  id: $lp{id}\n";
    if ($lp{'desc'} ne '') {
	print $fh "  desc: $lp{desc}\n";
    } else {
	print $fh "  desc:\n";
    }
    print $fh "  user: $lp{user}\n";

    # source
    %lp = combinetgts(%{$lang{$id}{'source'}});
    print $fh "  <source>\n";
    foreach my $tgt (sort(keys(%lp))) {
	if ($lp{$tgt} eq 'none') {
	    print $fh "    $tgt: $lp{$tgt}\n";
	} else {
	    print $fh "    $tgt: \"$lp{$tgt}\"\n";
	}
    }
    print $fh "  </source>\n";

    # dest
    %lp = combinetgts(%{$lang{$id}{'dest'}});
    print $fh "  <dest>\n";
    foreach my $tgt (sort(keys(%lp))) {
	if ($lp{$tgt} eq 'none') {
	    print $fh "    $tgt: $lp{$tgt}\n";
	} else {
	    print $fh "    $tgt: \"$lp{$tgt}\"\n";
	}
    }
    print $fh "  </dest>\n";

    # voice
    %lp = combinetgts(%{$lang{$id}{'voice'}});
    print $fh "  <voice>\n";
    foreach my $tgt (sort(keys(%lp))) {
	if ($lp{$tgt} eq 'none') {
	    print $fh "    $tgt: $lp{$tgt}\n";
	} else {
	    print $fh "    $tgt: \"$lp{$tgt}\"\n";
	}
    }
    print $fh "  </voice>\n";

    # FiN
    print $fh "</phrase>\n";
}

if ($ARGV[2] ne '-') {
    close(FH);
}