#!/usr/bin/env bash

set -eou pipefail

nj=15
stage=-1
stop_stage=100

# We assume dl_dir (download dir) contains the following
# directories and files. If not, they will be downloaded
# by this script automatically.
#
#  - $dl_dir/xbmu_amdo31
#      You can find data, resource, etc, inside it.
#      You can download them from https://huggingface.co/datasets/syzym/xbmu_amdo31
#
#  - $dl_dir/lm
#      This directory contains the following files downloaded from
#       git lfs install
#       https://huggingface.co/syzym/xbmu_amdo31_lm
#
#        - tibetan.3-gram.arpa
#        - tibetan.4-gram.arpa
#
#  - $dl_dir/musan
#      This directory contains the following directories downloaded from
#       http://www.openslr.org/17/
#
#     - music
#     - noise
#     - speech

dl_dir=$PWD/download

. shared/parse_options.sh || exit 1

# vocab size for sentence piece models.
# It will generate data/lang_bpe_xxx,
# data/lang_bpe_yyy if the array contains xxx, yyy
vocab_sizes=(
  1000
  500
)

# All files generated by this script are saved in "data".
# You can safely remove "data" and rerun this script to regenerate it.
mkdir -p data

log() {
  # This function is from espnet
  local fname=${BASH_SOURCE[1]##*/}
  echo -e "$(date '+%Y-%m-%d %H:%M:%S') (${fname}:${BASH_LINENO[0]}:${FUNCNAME[1]}) $*"
}

log "dl_dir: $dl_dir"

if [ $stage -le -1 ] && [ $stop_stage -ge -1 ]; then
  log "stage -1: Download LM"
  # We assume that you have installed the git-lfs, if not, you could install it
  # using: `sudo apt-get install git-lfs && git-lfs install`
  git lfs 1>/dev/null 2>&1 || (echo "please install git-lfs, consider using: sudo apt-get install git-lfs && git-lfs install" && exit 1)

  if [ ! -f $dl_dir/lm/3-gram.unpruned.arpa ]; then
    git clone https://huggingface.co/syzym/xbmu_amdo31_lm $dl_dir/lm
    pushd $dl_dir/lm
    git lfs pull --include "tibetan.3-gram.arpa"
    git lfs pull --include "tibetan.4-gram.arpa"
    popd
  fi
fi

if [ $stage -le 0 ] && [ $stop_stage -ge 0 ]; then
  log "Stage 0: Download data"

  # If you have pre-downloaded it to /path/to/xbmu_amdo31,
  # you can create a symlink
  #
  #   ln -sfv /path/to/xbmu_amdo31 $dl_dir/xbmu_amdo31
  #
  
  if [ ! -f $dl_dir/xbmu_amdo31 ]; then
    git lfs 1>/dev/null 2>&1 || (echo "please install git-lfs, consider using: sudo apt-get install git-lfs && git-lfs install" && exit 1)
    lhotse download xbmu-amdo31 $dl_dir
  fi

  # If you have pre-downloaded it to /path/to/musan,
  # you can create a symlink
  #
  #   ln -sfv /path/to/musan $dl_dir/
  #
  if [ ! -d $dl_dir/musan ]; then
    lhotse download musan $dl_dir
  fi
fi

if [ $stage -le 1 ] && [ $stop_stage -ge 1 ]; then
  log "Stage 1: Prepare xbmu_amdo31 manifest"
  # We assume that you have downloaded the xbmu_amdo31 corpus
  # to $dl_dir/xbmu_amdo31
  if [ ! -f data/manifests/.xbmu_amdo31_manifests.done ]; then
    mkdir -p data/manifests
    lhotse prepare xbmu-amdo31 $dl_dir/xbmu_amdo31 data/manifests
    touch data/manifests/.xbmu_amdo31_manifests.done
  fi
fi

if [ $stage -le 2 ] && [ $stop_stage -ge 2 ]; then
  log "Stage 2: Prepare musan manifest"
  # We assume that you have downloaded the musan corpus
  # to data/musan
  if [ ! -f data/manifests/.musan_manifests.done ]; then
    log "It may take 6 minutes"
    mkdir -p data/manifests
    lhotse prepare musan $dl_dir/musan data/manifests
    touch data/manifests/.musan_manifests.done
  fi
fi

if [ $stage -le 3 ] && [ $stop_stage -ge 3 ]; then
  log "Stage 3: Compute fbank for xbmu_amdo31"
  if [ ! -f data/fbank/.xbmu_amdo31.done ]; then
    mkdir -p data/fbank
    ./local/compute_fbank_xbmu_amdo31.py
    touch data/fbank/.xbmu_amdo31.done
  fi
fi



if [ $stage -le 4 ] && [ $stop_stage -ge 4 ]; then
  log "Stage 4: Compute fbank for musan"
  if [ ! -f data/fbank/.msuan.done ]; then
    mkdir -p data/fbank
    ./local/compute_fbank_musan.py
    touch data/fbank/.msuan.done
  fi
fi


if [ $stage -le 5 ] && [ $stop_stage -ge 5 ]; then
  log "Stage 5: Prepare phone based lang"
  lang_dir=data/lang_phone
  mkdir -p $lang_dir

  (echo '!SIL SIL'; echo '<SPOKEN_NOISE> SPN'; echo '<UNK> SPN'; ) |
    cat - $dl_dir/xbmu_amdo31/resource/lexicon.txt |
    sort | uniq > $lang_dir/lexicon.txt

  ./local/generate_unique_lexicon.py --lang-dir $lang_dir

  if [ ! -f $lang_dir/L_disambig.pt ]; then
    ./local/prepare_lang.py --lang-dir $lang_dir
  fi
fi


if [ $stage -le 6 ] && [ $stop_stage -ge 6 ]; then
  log "Stage 6: Prepare BPE based lang"

  for vocab_size in ${vocab_sizes[@]}; do
    lang_dir=data/lang_bpe_${vocab_size}
    mkdir -p $lang_dir
    # We reuse words.txt from phone based lexicon
    # so that the two can share G.pt later.
    cp data/lang_phone/words.txt $lang_dir

  if [ ! -f $lang_dir/transcript_words.txt ]; then
    log "Generate data to train phone based bigram P"
    xbmu_amdo31_text=$dl_dir/xbmu_amdo31/data/transcript/transcript_clean.txt
    xbmu_amdo31_train_uid=$dl_dir/xbmu_amdo31/data/transcript/xbmu_amdo31_train_uid
    find $dl_dir/xbmu_amdo31/data/wav/train -name "*.wav" | sed 's/\.wav//g' | awk -F '-' '{print $NF}' > $xbmu_amdo31_train_uid
    awk 'NR==FNR{uid[$1]=$1} NR!=FNR{if($1 in uid) print $0}' $xbmu_amdo31_train_uid $xbmu_amdo31_text |
	    cut -d " " -f 2- > $lang_dir/transcript_words.txt
  fi

    if [ ! -f $lang_dir/bpe.model ]; then
      ./local/train_bpe_model.py \
        --lang-dir $lang_dir \
        --vocab-size $vocab_size \
        --transcript $lang_dir/transcript_words.txt
    fi

    if [ ! -f $lang_dir/L_disambig.pt ]; then
      ./local/prepare_lang_bpe.py --lang-dir $lang_dir

      log "Validating $lang_dir/lexicon.txt"
      ./local/validate_bpe_lexicon.py \
        --lexicon $lang_dir/lexicon.txt \
        --bpe-model $lang_dir/bpe.model
    fi
  done
fi

if [ $stage -le 7 ] && [ $stop_stage -ge 7 ]; then
  log "Stage 7: Prepare bigram P"

  for vocab_size in ${vocab_sizes[@]}; do
    lang_dir=data/lang_bpe_${vocab_size}

    if [ ! -f $lang_dir/transcript_tokens.txt ]; then
      ./local/convert_transcript_words_to_tokens.py \
        --lexicon $lang_dir/lexicon.txt \
        --transcript $lang_dir/transcript_words.txt \
        --oov "<UNK>" \
        > $lang_dir/transcript_tokens.txt
    fi

    if [ ! -f $lang_dir/P.arpa ]; then
      ./shared/make_kn_lm.py \
        -ngram-order 2 \
        -text $lang_dir/transcript_tokens.txt \
        -lm $lang_dir/P.arpa
    fi

    if [ ! -f $lang_dir/P.fst.txt ]; then
      python3 -m kaldilm \
        --read-symbol-table="$lang_dir/tokens.txt" \
        --disambig-symbol='#0' \
        --max-order=2 \
        $lang_dir/P.arpa > $lang_dir/P.fst.txt
    fi
  done
fi

if [ $stage -le 8 ] && [ $stop_stage -ge 8 ]; then
  log "Stage 8: Prepare G"
  # We assume you have installed kaldilm, if not, please install
  # it using: pip install kaldilm

  mkdir -p data/lm
  if [ ! -f data/lm/G_3_gram.fst.txt ]; then
    # It is used in building HLG
    python3 -m kaldilm \
      --read-symbol-table="data/lang_phone/words.txt" \
      --disambig-symbol='#0' \
      --max-order=3 \
      $dl_dir/lm/tibetan.3-gram.arpa > data/lm/G_3_gram.fst.txt
  fi

  if [ ! -f data/lm/G_4_gram.fst.txt ]; then
    # It is used for LM rescoring
    python3 -m kaldilm \
      --read-symbol-table="data/lang_phone/words.txt" \
      --disambig-symbol='#0' \
      --max-order=4 \
      $dl_dir/lm/tibetan.4-gram.arpa > data/lm/G_4_gram.fst.txt
  fi
fi

if [ $stage -le 9 ] && [ $stop_stage -ge 9 ]; then
  log "Stage 9: Compile HLG"
  ./local/compile_hlg.py --lang-dir data/lang_phone

  for vocab_size in ${vocab_sizes[@]}; do
    lang_dir=data/lang_bpe_${vocab_size}
    ./local/compile_hlg.py --lang-dir $lang_dir
  done
fi

# Compile LG for RNN-T fast_beam_search decoding
if [ $stage -le 10 ] && [ $stop_stage -ge 10 ]; then
  log "Stage 10: Compile LG"
  ./local/compile_lg.py --lang-dir data/lang_phone

  for vocab_size in ${vocab_sizes[@]}; do
    lang_dir=data/lang_bpe_${vocab_size}
    ./local/compile_lg.py --lang-dir $lang_dir
  done
fi

if [ $stage -le 11 ] && [ $stop_stage -ge 11 ]; then
  log "Stage 11: Generate LM training data"

  for vocab_size in ${vocab_sizes[@]}; do
    log "Processing vocab_size == ${vocab_size}"
    lang_dir=data/lang_bpe_${vocab_size}
    out_dir=data/lm_training_bpe_${vocab_size}
    mkdir -p $out_dir

    ./local/prepare_lm_training_data.py \
      --bpe-model $lang_dir/bpe.model \
      --lm-data $dl_dir/lm/lm_train.txt \
      --lm-archive $out_dir/lm_data.pt
  done
fi

if [ $stage -le 12 ] && [ $stop_stage -ge 12 ]; then
  log "Stage 12: Generate LM validation data"

  for vocab_size in ${vocab_sizes[@]}; do
    log "Processing vocab_size == ${vocab_size}"
    out_dir=data/lm_training_bpe_${vocab_size}
    mkdir -p $out_dir

    if [ ! -f $out_dir/valid.txt ]; then
      files=$dl_dir/xbmu_amdo31/data/transcript/dev_text
      for f in ${files[@]}; do
        cat $f | cut -d " " -f 2-
      done > $out_dir/valid.txt
    fi

    lang_dir=data/lang_bpe_${vocab_size}
    ./local/prepare_lm_training_data.py \
      --bpe-model $lang_dir/bpe.model \
      --lm-data $out_dir/valid.txt \
      --lm-archive $out_dir/lm_data-valid.pt
  done
fi

if [ $stage -le 13 ] && [ $stop_stage -ge 13 ]; then
  log "Stage 13: Generate LM test data"

  for vocab_size in ${vocab_sizes[@]}; do
    log "Processing vocab_size == ${vocab_size}"
    out_dir=data/lm_training_bpe_${vocab_size}
    mkdir -p $out_dir

    if [ ! -f $out_dir/test.txt ]; then
        files=$dl_dir/xbmu_amdo31/data/transcript/test_text
        cat $f | cut -d " " -f 2- > $out_dir/test.txt
    fi

    lang_dir=data/lang_bpe_${vocab_size}
    ./local/prepare_lm_training_data.py \
      --bpe-model $lang_dir/bpe.model \
      --lm-data $out_dir/test.txt \
      --lm-archive $out_dir/lm_data-test.pt
  done
fi

if [ $stage -le 14 ] && [ $stop_stage -ge 14 ]; then
  log "Stage 14: Sort LM training data"
  # Sort LM training data by sentence length in descending order
  # for ease of training.
  #
  # Sentence length equals to the number of BPE tokens
  # in a sentence.

  for vocab_size in ${vocab_sizes[@]}; do
    out_dir=data/lm_training_bpe_${vocab_size}
    mkdir -p $out_dir
    ./local/sort_lm_training_data.py \
      --in-lm-data $out_dir/lm_data.pt \
      --out-lm-data $out_dir/sorted_lm_data.pt \
      --out-statistics $out_dir/statistics.txt

    ./local/sort_lm_training_data.py \
      --in-lm-data $out_dir/lm_data-valid.pt \
      --out-lm-data $out_dir/sorted_lm_data-valid.pt \
      --out-statistics $out_dir/statistics-valid.txt

    ./local/sort_lm_training_data.py \
      --in-lm-data $out_dir/lm_data-test.pt \
      --out-lm-data $out_dir/sorted_lm_data-test.pt \
      --out-statistics $out_dir/statistics-test.txt
  done
fi