#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# Workspace root containing train/ and test/ outputs; override via MVEB_ROOT.
ROOT_DIR="${MVEB_ROOT:-$(cd "${SCRIPT_DIR}/../../.." && pwd)}"
DOWNLOAD_DIR="${ROOT_DIR}/downloads/ms1m"
SOURCE_DIR="${ROOT_DIR}/source/ms1m"
DATASET_REPO="gaunernst/ms1mv3-wds-gz"

need_cmd() {
    command -v "$1" >/dev/null 2>&1 || {
        echo "Missing command: $1" >&2
        exit 1
    }
}

need_cmd huggingface-cli
need_cmd tar
need_cmd python3

mkdir -p "${DOWNLOAD_DIR}" "${SOURCE_DIR}"

echo "==> Downloading dataset ${DATASET_REPO} to ${DOWNLOAD_DIR}"
huggingface-cli download \
  --repo-type dataset \
  "${DATASET_REPO}" \
  --local-dir "${DOWNLOAD_DIR}" \
  --local-dir-use-symlinks False

echo "==> Extracting ms1mv3-*.tar.gz to ${SOURCE_DIR}"
for tar_file in "${DOWNLOAD_DIR}"/ms1mv3-*.tar.gz; do
    [[ -f "${tar_file}" ]] || continue
    shard="$(basename "${tar_file}" .tar.gz)"
    shard="${shard#ms1mv3-}"
    out_dir="${SOURCE_DIR}/${shard}"
    marker="${out_dir}/.extracted"
    # Marker is only written after a successful tar run, so an interrupted
    # extraction (non-empty dir without marker) is redone from scratch.
    if [[ -f "${marker}" ]]; then
        echo "   skip ${tar_file} (already extracted: ${out_dir})"
        continue
    fi
    echo "   extracting $(basename "${tar_file}") -> ${out_dir}"
    mkdir -p "${out_dir}"
    tar -zxf "${tar_file}" -C "${out_dir}"
    touch "${marker}"
done

if [[ -f "${DOWNLOAD_DIR}/README.md" ]]; then
    cp -f "${DOWNLOAD_DIR}/README.md" "${SOURCE_DIR}/README.md"
fi

echo "==> Pack MS1M to parquet"
python3 "${SCRIPT_DIR}/process_ms1m.py" --overwrite \
    --image-root "${SOURCE_DIR}" \
    --output-root "${ROOT_DIR}"

echo "==> Done"
echo "    download: ${DOWNLOAD_DIR}"
echo "    source:   ${SOURCE_DIR}"
echo "    output:   ${MVEB_TRAIN_DIR:-${ROOT_DIR}/MVEB-train}/MS-Celeb-1M , ${MVEB_TEST_DIR:-${ROOT_DIR}/MVEB-test}/MS-Celeb-1M"