#!/usr/bin/env bash

# fix segmentation fault reported in https://github.com/k2-fsa/icefall/issues/674
export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python

set -eou pipefail

stage=-1
stop_stage=100

dl_dir=$PWD/download

. shared/parse_options.sh || exit 1

# 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: build monotonic_align lib (used by vits and matcha recipes)"
  for recipe in vits matcha; do
    if [ ! -d $recipe/monotonic_align/build ]; then
      cd $recipe/monotonic_align
      python3 setup.py build_ext --inplace
      cd ../../
    else
      log "monotonic_align lib for $recipe already built"
    fi
  done
fi

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

  # The directory $dl_dir/LJSpeech-1.1 will contain:
  #   - wavs, which contains the audio files
  #   - metadata.csv, which provides the transcript text for each audio clip

  # If you have pre-downloaded it to /path/to/LJSpeech-1.1, you can create a symlink
  #
  #   ln -sfv /path/to/LJSpeech-1.1 $dl_dir/LJSpeech-1.1
  #
  if [ ! -d $dl_dir/LJSpeech-1.1 ]; then
    lhotse download ljspeech $dl_dir
  fi
fi

if [ $stage -le 1 ] && [ $stop_stage -ge 1 ]; then
  log "Stage 1: Prepare LJSpeech manifest"
  # We assume that you have downloaded the LJSpeech corpus
  # to $dl_dir/LJSpeech-1.1
  mkdir -p data/manifests
  if [ ! -e data/manifests/.ljspeech.done ]; then
    lhotse prepare ljspeech $dl_dir/LJSpeech-1.1 data/manifests
    touch data/manifests/.ljspeech.done
  fi
fi

if [ $stage -le 2 ] && [ $stop_stage -ge 2 ]; then
  log "Stage 2: Compute spectrogram for LJSpeech (used by ./vits)"
  mkdir -p data/spectrogram
  if [ ! -e data/spectrogram/.ljspeech.done ]; then
    ./local/compute_spectrogram_ljspeech.py
    touch data/spectrogram/.ljspeech.done
  fi

  if [ ! -e data/spectrogram/.ljspeech-validated.done ]; then
    log "Validating data/spectrogram for LJSpeech (used by ./vits)"
    python3 ./local/validate_manifest.py \
      data/spectrogram/ljspeech_cuts_all.jsonl.gz
    touch data/spectrogram/.ljspeech-validated.done
  fi
fi

if [ $stage -le 3 ] && [ $stop_stage -ge 3 ]; then
  log "Stage 3: Prepare phoneme tokens for LJSpeech (used by ./vits)"
  # We assume you have installed piper_phonemize and espnet_tts_frontend.
  # If not, please install them with:
  #   - piper_phonemize: pip install piper_phonemize -f https://k2-fsa.github.io/icefall/piper_phonemize.html,
  #   - espnet_tts_frontend, `pip install espnet_tts_frontend`, refer to https://github.com/espnet/espnet_tts_frontend/
  if [ ! -e data/spectrogram/.ljspeech_with_token.done ]; then
    ./local/prepare_tokens_ljspeech.py --in-out-dir ./data/spectrogram
    mv data/spectrogram/ljspeech_cuts_with_tokens_all.jsonl.gz \
      data/spectrogram/ljspeech_cuts_all.jsonl.gz
    touch data/spectrogram/.ljspeech_with_token.done
  fi
fi

if [ $stage -le 4 ] && [ $stop_stage -ge 4 ]; then
  log "Stage 4: Split the LJSpeech cuts into train, valid and test sets (used by vits)"
  if [ ! -e data/spectrogram/.ljspeech_split.done ]; then
    lhotse subset --last 600 \
      data/spectrogram/ljspeech_cuts_all.jsonl.gz \
      data/spectrogram/ljspeech_cuts_validtest.jsonl.gz
    lhotse subset --first 100 \
      data/spectrogram/ljspeech_cuts_validtest.jsonl.gz \
      data/spectrogram/ljspeech_cuts_valid.jsonl.gz
    lhotse subset --last 500 \
      data/spectrogram/ljspeech_cuts_validtest.jsonl.gz \
      data/spectrogram/ljspeech_cuts_test.jsonl.gz

    rm data/spectrogram/ljspeech_cuts_validtest.jsonl.gz

    n=$(( $(gunzip -c data/spectrogram/ljspeech_cuts_all.jsonl.gz | wc -l) - 600 ))
    lhotse subset --first $n  \
      data/spectrogram/ljspeech_cuts_all.jsonl.gz \
      data/spectrogram/ljspeech_cuts_train.jsonl.gz
      touch data/spectrogram/.ljspeech_split.done
  fi
fi

if [ $stage -le 5 ] && [ $stop_stage -ge 5 ]; then
  log "Stage 5: Generate token file"
  # We assume you have installed piper_phonemize and espnet_tts_frontend.
  # If not, please install them with:
  #   - piper_phonemize: refer to https://github.com/rhasspy/piper-phonemize,
  #                      could install the pre-built wheels from https://github.com/csukuangfj/piper-phonemize/releases/tag/2023.12.5
  #   - espnet_tts_frontend, `pip install espnet_tts_frontend`, refer to https://github.com/espnet/espnet_tts_frontend/
  if [ ! -e data/tokens.txt ]; then
    ./local/prepare_token_file.py --tokens data/tokens.txt
  fi
fi

if [ $stage -le 6 ] && [ $stop_stage -ge 6 ]; then
  log "Stage 6: Generate fbank (used by ./matcha)"
  mkdir -p data/fbank
  if [ ! -e data/fbank/.ljspeech.done ]; then
    ./local/compute_fbank_ljspeech.py
    touch data/fbank/.ljspeech.done
  fi

  if [ ! -e data/fbank/.ljspeech-validated.done ]; then
    log "Validating data/fbank for LJSpeech (used by ./matcha)"
    python3 ./local/validate_manifest.py \
      data/fbank/ljspeech_cuts_all.jsonl.gz
    touch data/fbank/.ljspeech-validated.done
  fi
fi

if [ $stage -le 7 ] && [ $stop_stage -ge 7 ]; then
  log "Stage 7: Prepare phoneme tokens for LJSpeech (used by ./matcha)"
  # We assume you have installed piper_phonemize and espnet_tts_frontend.
  # If not, please install them with:
  #   - piper_phonemize: pip install piper_phonemize -f https://k2-fsa.github.io/icefall/piper_phonemize.html,
  #   - espnet_tts_frontend, `pip install espnet_tts_frontend`, refer to https://github.com/espnet/espnet_tts_frontend/
  if [ ! -e data/fbank/.ljspeech_with_token.done ]; then
    ./local/prepare_tokens_ljspeech.py --in-out-dir ./data/fbank
    mv data/fbank/ljspeech_cuts_with_tokens_all.jsonl.gz \
      data/fbank/ljspeech_cuts_all.jsonl.gz
    touch data/fbank/.ljspeech_with_token.done
  fi
fi

if [ $stage -le 8 ] && [ $stop_stage -ge 8 ]; then
  log "Stage 8: Split the LJSpeech cuts into train, valid and test sets (used by ./matcha)"
  if [ ! -e data/fbank/.ljspeech_split.done ]; then
    lhotse subset --last 600 \
      data/fbank/ljspeech_cuts_all.jsonl.gz \
      data/fbank/ljspeech_cuts_validtest.jsonl.gz
    lhotse subset --first 100 \
      data/fbank/ljspeech_cuts_validtest.jsonl.gz \
      data/fbank/ljspeech_cuts_valid.jsonl.gz
    lhotse subset --last 500 \
      data/fbank/ljspeech_cuts_validtest.jsonl.gz \
      data/fbank/ljspeech_cuts_test.jsonl.gz

    rm data/fbank/ljspeech_cuts_validtest.jsonl.gz

    n=$(( $(gunzip -c data/fbank/ljspeech_cuts_all.jsonl.gz | wc -l) - 600 ))
    lhotse subset --first $n  \
      data/fbank/ljspeech_cuts_all.jsonl.gz \
      data/fbank/ljspeech_cuts_train.jsonl.gz
      touch data/fbank/.ljspeech_split.done
  fi
fi

if [ $stage -le 9 ] && [ $stop_stage -ge 9 ]; then
  log "Stage 9: Compute fbank mean and std (used by ./matcha)"
  if [ ! -f ./data/fbank/cmvn.json ]; then
    ./local/compute_fbank_statistics.py ./data/fbank/ljspeech_cuts_train.jsonl.gz ./data/fbank/cmvn.json
  fi
fi