#!/usr/bin/env bash
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
TAR_NAME="DressCode.tar"
OUT_DIR="${1:-${SCRIPT_DIR}/data/DressCode}"
TAR_PATH="${SCRIPT_DIR}/${TAR_NAME}"

join_parts() {
  local out="$1"
  shopt -s nullglob
  local parts=( "${out}".part* )
  shopt -u nullglob
  [[ ${#parts[@]} -gt 0 ]] || return 1
  IFS=$'\n' parts=( $(printf '%s\n' "${parts[@]}" | sort) )
  echo "==> Joining ${#parts[@]} parts -> ${out}"
  rm -f "${out}"
  cat "${parts[@]}" > "${out}"
}

if [[ ! -f "${TAR_PATH}" ]]; then
  join_parts "${TAR_PATH}" || { echo "ERROR: missing ${TAR_PATH} / parts" >&2; exit 1; }
fi

PARENT="$(dirname "${OUT_DIR}")"
mkdir -p "${PARENT}"
echo "==> Extracting ${TAR_NAME} -> ${PARENT}"
tar -xf "${TAR_PATH}" -C "${PARENT}"

ROOT="${OUT_DIR}"
if [[ -d "${PARENT}/DressCode/dresses" ]]; then ROOT="${PARENT}/DressCode"
elif [[ -d "${OUT_DIR}/DressCode/dresses" ]]; then ROOT="${OUT_DIR}/DressCode"
elif [[ -d "${OUT_DIR}/dresses" ]]; then ROOT="${OUT_DIR}"; fi

echo "==> Verifying layout under ${ROOT}"
missing=0
for n in dresses upper_body lower_body; do
  if [[ ! -d "${ROOT}/${n}" ]]; then echo "  MISSING: ${n}"; missing=1; else echo "  OK: ${n}"; fi
done
[[ "${missing}" -eq 0 ]] || exit 2
echo "==> Done. Dataset root: ${ROOT}"
echo "Optional: rm -f '${TAR_PATH}' '${TAR_PATH}'.part*"