# Copyright (c) 2019-present, Facebook, Inc.
# All rights reserved.
#
# This source code is licensed under the license found in the
# LICENSE file in the root directory of this source tree.
#

#
# Usage: ./get-data-para.sh $lg_pair
#

set -e

pair=$1  # input language pair

# data paths
MAIN_PATH=$PWD
PARA_PATH=$PWD/data/para

# tools paths
TOOLS_PATH=$PWD/tools
TOKENIZE=$TOOLS_PATH/tokenize.sh
LOWER_REMOVE_ACCENT=$TOOLS_PATH/lowercase_and_remove_accent.py

# install tools
./install-tools.sh

# create directories
mkdir -p $PARA_PATH


#
# Download and uncompress data
#

# ar-en
if [ $pair == "ar-en" ]; then
  # OpenSubtitles 2018
  # wget -c http://opus.nlpl.eu/download.php?f=OpenSubtitles2018%2Far-en.txt.zip -P $PARA_PATH
  # MultiUN
  wget -c http://opus.nlpl.eu/download.php?f=MultiUN%2Far-en.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/download.php?f=MultiUN%2Far-en.txt.zip -d $PARA_PATH
fi

# bg-en
if [ $pair == "bg-en" ]; then
  # OpenSubtitles 2018
  # wget -c http://opus.nlpl.eu/download.php?f=OpenSubtitles2018%2Fbg-en.txt.zip -P $PARA_PATH
  # EU Bookshop
  wget -c http://opus.nlpl.eu/download.php?f=EUbookshop%2Fbg-en.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/download.php?f=EUbookshop%2Fbg-en.txt.zip -d $PARA_PATH
  # Europarl
  wget -c http://opus.nlpl.eu/download.php?f=Europarl%2Fbg-en.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/download.php?f=Europarl%2Fbg-en.txt.zip -d $PARA_PATH
fi

# de-en
if [ $pair == "de-en" ]; then
  # OpenSubtitles 2018
  # wget -c http://opus.nlpl.eu/download.php?f=OpenSubtitles2018%2Fde-en.txt.zip -P $PARA_PATH
  # EU Bookshop
  wget -c http://opus.nlpl.eu/download.php?f=EUbookshop%2Fde-en.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/download.php?f=EUbookshop%2Fde-en.txt.zip -d $PARA_PATH
fi

# el-en
if [ $pair == "el-en" ]; then
  # OpenSubtitles 2018
  # wget -c http://opus.nlpl.eu/download.php?f=OpenSubtitles2018%2Fel-en.txt.zip -P $PARA_PATH
  # EU Bookshop
  wget -c http://opus.nlpl.eu/download.php?f=EUbookshop%2Fel-en.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/download.php?f=EUbookshop%2Fel-en.txt.zip -d $PARA_PATH
fi

# en-es
if [ $pair == "en-es" ]; then
  # OpenSubtitles 2018
  # wget -c http://opus.nlpl.eu/download.php?f=OpenSubtitles2018%2Fen-es.txt.zip -P $PARA_PATH
  # EU Bookshop
  # wget -c http://opus.nlpl.eu/download.php?f=EUbookshop%2Fen-es.txt.zip -P $PARA_PATH
  # MultiUN
  wget -c https://object.pouta.csc.fi/OPUS-MultiUN/v1/moses/en-es.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/en-es.txt.zip -d $PARA_PATH
fi

# en-fr
if [ $pair == "en-fr" ]; then
  echo "Download parallel data for English-Hindi"
  # OpenSubtitles 2018
  # wget -c http://opus.nlpl.eu/download.php?f=OpenSubtitles2018%2Fen-fr.txt.zip -P $PARA_PATH
  # EU Bookshop
  # wget -c http://opus.nlpl.eu/download.php?f=EUbookshop%2Fen-fr.txt.zip -P $PARA_PATH
  # MultiUN
  wget -c https://object.pouta.csc.fi/OPUS-MultiUN/v1/moses/en-fr.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/en-fr.txt.zip -d $PARA_PATH
fi

# en-hi
if [ $pair == "en-hi" ]; then
  echo "Download parallel data for English-Hindi"
  # IIT Bombay English-Hindi Parallel Corpus
  wget -c http://www.cfilt.iitb.ac.in/iitb_parallel/iitb_corpus_download/parallel.tgz -P $PARA_PATH
  tar -xvf $PARA_PATH/parallel.tgz -d $PARA_PATH
fi

# en-ru
if [ $pair == "en-ru" ]; then
  echo "Download parallel data for English-Russian"
  # OpenSubtitles 2018
  # wget -c http://opus.nlpl.eu/download.php?f=OpenSubtitles2018%2Fen-ru.txt.zip -P $PARA_PATH
  # MultiUN
  wget -c http://opus.nlpl.eu/download.php?f=MultiUN%2Fen-ru.txt.zip -P $PARA_PATH
  unzip -u download.php?f=MultiUN%2Fen-ru.txt.zip -d $PARA_PATH
fi

# en-sw
if [ $pair == "en-sw" ]; then
  echo "Download parallel data for English-Swahili"
  # Tanzil
  wget -c http://opus.nlpl.eu/download.php?f=Tanzil%2Fen-sw.txt.zip -P $PARA_PATH
  unzip -u download.php?f=Tanzil%2Fen-sw.txt.zip -d $PARA_PATH
  # GlobalVoices
  wget -c http://opus.nlpl.eu/download.php?f=GlobalVoices%2Fen-sw.txt.zip -P $PARA_PATH
  unzip -u download.php?f=GlobalVoices%2Fen-sw.txt.zip -d $PARA_PATH
fi

# en-th
if [ $pair == "en-th" ]; then
  echo "Download parallel data for English-Thai"
  # OpenSubtitles 2018
  wget -c http://opus.nlpl.eu/download.php?f=OpenSubtitles2018%2Fen-th.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/download.php?f=OpenSubtitles2018%2Fen-th.txt.zip -d $PARA_PATH
fi

# en-tr
if [ $pair == "en-tr" ]; then
  echo "Download parallel data for English-Turkish"
  # OpenSubtitles 2018
  # wget -c http://opus.nlpl.eu/download.php?f=OpenSubtitles2018%2Fen-tr.txt.zip -P $PARA_PATH
  # SETIMES2
  wget -c http://opus.nlpl.eu/download.php?f=SETIMES2%2Fen-tr.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/download.php?f=SETIMES2%2Fen-tr.txt.zip -d $PARA_PATH
  # Wikipedia
  wget -c http://opus.nlpl.eu/download.php?f=Wikipedia%2Fen-tr.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/download.php?f=Wikipedia%2Fen-tr.txt.zip -d $PARA_PATH
  # TED
  wget -c https://object.pouta.csc.fi/OPUS-TED2013/v1.1/moses/en-tr.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/en-tr.txt.zip -d $PARA_PATH
fi

# en-ur
if [ $pair == "en-ur" ]; then
  echo "Download parallel data for English-Urdu"
  # OpenSubtitles 2018
  # wget -c http://opus.nlpl.eu/download.php?f=OpenSubtitles2018%2Fen-ur.txt.zip -P $PARA_PATH
  # Tanzil
  wget -c http://opus.nlpl.eu/download.php?f=Tanzil%2Fen-ur.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/download.php?f=Tanzil%2Fen-ur.txt.zip -d $PARA_PATH
fi

# en-vi
if [ $pair == "en-vi" ]; then
  echo "Download parallel data for English-Vietnamese"
  # OpenSubtitles 2018
  wget -c http://opus.nlpl.eu/download.php?f=OpenSubtitles2018%2Fen-vi.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/download.php?f=OpenSubtitles2018%2Fen-vi.txt.zip -d $PARA_PATH
fi

# en-zh
if [ $pair == "en-zh" ]; then
  echo "Download parallel data for English-Chinese"
  # OpenSubtitles 2016
  # wget -c http://opus.nlpl.eu/download.php?f=OpenSubtitles2016%2Fen-zh.txt.zip -P $PARA_PATH
  # MultiUN
  wget -c http://opus.nlpl.eu/download.php?f=MultiUN%2Fen-zh.txt.zip -P $PARA_PATH
  unzip -u $PARA_PATH/download.php?f=MultiUN%2Fen-zh.txt.zip -d $PARA_PATH
fi


#
# Tokenize and preprocess data
#

# tokenize
for lg in $(echo $pair | sed -e 's/\-/ /g'); do
  if [ ! -f $PARA_PATH/$pair.$lg.all ]; then
    cat $PARA_PATH/*.$pair.$lg | $TOKENIZE $lg | python $LOWER_REMOVE_ACCENT > $PARA_PATH/$pair.$lg.all
  fi
done

# split into train / valid / test
split_data() {
    get_seeded_random() {
        seed="$1"; openssl enc -aes-256-ctr -pass pass:"$seed" -nosalt </dev/zero 2>/dev/null
    };
    NLINES=`wc -l $1  | awk -F " " '{print $1}'`;
    NTRAIN=$((NLINES - 10000));
    NVAL=$((NTRAIN + 5000));
    shuf --random-source=<(get_seeded_random 42) $1 | head -$NTRAIN             > $2;
    shuf --random-source=<(get_seeded_random 42) $1 | head -$NVAL | tail -5000  > $3;
    shuf --random-source=<(get_seeded_random 42) $1 | tail -5000                > $4;
}
for lg in $(echo $pair | sed -e 's/\-/ /g'); do
  split_data $PARA_PATH/$pair.$lg.all $PARA_PATH/$pair.$lg.train $PARA_PATH/$pair.$lg.valid $PARA_PATH/$pair.$lg.test
done