#!/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="${ROOT_DIR}/downloads/iust"
# Zip top-level is IUSTPersonReID/; unzip into source/ so we get:
#   source/IUSTPersonReID/{bounding_box_train,bounding_box_test,query}
SOURCE_PARENT="${ROOT_DIR}/source"
SOURCE_DIR="${SOURCE_PARENT}/IUSTPersonReID"
DATASET_REF="alirezasm/iust-personreid"

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

need_cmd kaggle
need_cmd unzip
need_cmd python3

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

echo "==> Download IUST Person ReID zip via Kaggle"
kaggle datasets download "${DATASET_REF}" -p "${DOWNLOAD_DIR}"

ZIP_FILE="$(ls -t "${DOWNLOAD_DIR}"/*.zip 2>/dev/null | head -n 1 || true)"
if [[ -z "${ZIP_FILE}" ]]; then
    echo "No zip file found under ${DOWNLOAD_DIR}" >&2
    exit 1
fi

echo "==> Unzip ${ZIP_FILE} -> ${SOURCE_PARENT}"
unzip -o "${ZIP_FILE}" -d "${SOURCE_PARENT}"

for name in bounding_box_train bounding_box_test query; do
    if [[ ! -d "${SOURCE_DIR}/${name}" ]]; then
        echo "Missing folder after unzip: ${SOURCE_DIR}/${name}" >&2
        exit 1
    fi
done

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

echo "==> Done"
echo "    zip:    ${ZIP_FILE}"
echo "    source: ${SOURCE_DIR}"
echo "    output: ${MVEB_TRAIN_DIR:-${ROOT_DIR}/MVEB-train}/IUST , ${MVEB_TEST_DIR:-${ROOT_DIR}/MVEB-test}/IUST"