#!/bin/sh
# makelang.sh - multi-language support high-level script
#  for generating lang_xx.bin (secondary language binary file)
#
# Input files:
#  lang_en.txt
#  lang_en_$LANG.txt
#
# Output files:
#  lang_en.tmp (temporary, will be removed when finished)
#  lang_en_$LANG.tmp ==||==
#  lang_en_$LANG.dif ==||==
#  lang_$LANG.txt
#
#
# Selected language:
LANG=$1
if [ -z "$LANG" ]; then LANG='cz'; fi
#
#

function finish
{
 if [ "$1" == "0" ]; then
  if [ -e lang_en.tmp ]; then rm lang_en.tmp; fi
  if [ -e lang_en_$LANG.tmp ]; then rm lang_en_$LANG.tmp; fi
  if [ -e lang_en_$LANG.dif ]; then rm lang_en_$LANG.dif; fi
 fi
 echo
 if [ "$1" == "0" ]; then
  echo "make_lang.sh finished with success" >&2
 else
  echo "make_lang.sh finished with errors!" >&2
 fi
 case "$-" in
  *i*) echo "press enter key"; read ;;
 esac
 exit $1
}

echo "make_lang.sh started" >&2
echo "selected language=$LANG" >&2

#check if input files exists
echo -n " checking input files..." >&2
if [ ! -e lang_en.txt ]; then echo "NG!  file lang_en.txt not found!" >&2; exit 1; fi
if [ ! -e lang_en_$LANG.txt ]; then echo "NG!  file lang_en_$LANG.txt not found!" >&2; exit 1; fi
echo "OK" >&2

#filter comment and empty lines from key and dictionary files, create temporary files
echo -n " creating tmp files..." >&2
cat lang_en.txt | sed "/^$/d;/^#/d" > lang_en.tmp
cat lang_en_$LANG.txt | sed "/^$/d;/^#/d" > lang_en_$LANG.tmp
echo "OK" >&2
#cat lang_en_$LANG.tmp | sed 'n;d' >test1.txt

#compare files using diff and check for differences
echo -n " comparing tmp files..." >&2
if ! cat lang_en_$LANG.tmp | sed 'n;d' | diff lang_en.tmp - > lang_en_$LANG.dif; then
 echo "NG!" >&2
 echo "Entries in lang_en_$LANG.txt are different from lang_en.txt!" >&2
 echo "please check lang_en_$LANG.dif" >&2
 finish 1
fi
echo "OK" >&2

#generate lang_xx.txt (secondary language text data sorted by ids)
echo -n " generating lang_$LANG.txt..." >&2
cat lang_en_$LANG.tmp | sed '1~2d' | sed "s/^\"\\\\x00/\"/" > lang_$LANG.txt
echo "OK" >&2

#generate lang_xx.dat (secondary language text data in binary form)
echo -n " generating lang_$LANG.dat..." >&2
cat lang_$LANG.txt | sed "s/\\\\/\\\\\\\\/g" | while read s; do
 s=${s#\"}
 s=${s%\"}
 echo -n -e "$s"'\x00'
done >lang_$LANG.dat
echo "OK" >&2

#calculate variables
lt_magic='\xa5\x5a\xb4\x4b'
lt_count=$(grep -c '^' lang_$LANG.txt)
lt_data_size=$(wc -c lang_$LANG.dat | cut -f1 -d' ')
lt_offs_size=$((2 * $lt_count))
lt_size=$((16 + $lt_offs_size + $lt_data_size))
lt_chsum=1
lt_resv0='\xff\xff'
lt_resv1='\xff\xff\xff\xff'

#generate lang_xx.ofs (secondary language text data offset table)
echo -n " generating lang_$LANG.ofs..." >&2
cat lang_$LANG.txt | sed "s/\\\\x[0-9a-f][0-9a-f]/\./g;s/\\\\[0-7][0-7][0-7]/\./g" |\
 awk 'BEGIN { o='$((16 + $lt_offs_size))';} { printf("%d\n",o); o+=(length($0)-1); }' > lang_$LANG.ofs
echo "OK" >&2

#generate lang_xx.bin (secondary language result binary file)
echo " generating lang_$LANG.bin:" >&2
#create empty file
dd if=/dev/zero of=lang_$LANG.bin bs=1 count=$lt_size 2>/dev/null
#awk code to format ui16 variables for dd
awk_ui16='{ h=int($1/256); printf("\\x%02x\\x%02x\n", int($1-256*h), h); }'

#write data to binary file with dd

echo -n "  writing header (16 bytes)..." >&2
echo -n -e "$lt_magic" |\
 dd of=lang_$LANG.bin bs=1 count=4 seek=0 conv=notrunc 2>/dev/null
echo -n -e $(echo -n "$lt_size" | awk "$awk_ui16") |\
 dd of=lang_$LANG.bin bs=1 count=2 seek=4 conv=notrunc 2>/dev/null
echo -n -e $(echo -n "$lt_count" | awk "$awk_ui16") |\
 dd of=lang_$LANG.bin bs=1 count=2 seek=6 conv=notrunc 2>/dev/null
echo -n -e $(echo -n "$lt_chsum" | awk "$awk_ui16") |\
 dd of=lang_$LANG.bin bs=1 count=2 seek=8 conv=notrunc 2>/dev/null
echo -n -e "$lt_resv0" |\
 dd of=lang_$LANG.bin bs=1 count=2 seek=10 conv=notrunc 2>/dev/null
echo -n -e "$lt_resv1" |\
 dd of=lang_$LANG.bin bs=1 count=4 seek=12 conv=notrunc 2>/dev/null
echo "OK" >&2

echo -n "  writing offset table ($lt_offs_size bytes)..." >&2
echo -n -e $(cat lang_$LANG.ofs | awk "$awk_ui16" | tr -d '\n'; echo) |\
 dd of=./lang_$LANG.bin bs=1 count=$lt_offs_size seek=16 conv=notrunc 2>/dev/null
echo "OK" >&2

echo -n "  writing text data ($lt_data_size bytes)..." >&2
dd if=./lang_$LANG.dat of=./lang_$LANG.bin bs=1 count=$lt_data_size seek=$((16 + $lt_offs_size)) conv=notrunc 2>/dev/null
echo "OK" >&2

echo " lang_table details:" >&2
echo "  lt_count = $lt_count" >&2
echo "  lt_size  = $lt_size" >&2
echo "  lt_chsum = $lt_chsum" >&2

finish 0