# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2018-present Team LibreELEC (https://libreelec.tv)

_get_file_already_downloaded() {
  { [ ! -f "${PACKAGE}" ] || [ ! -f "${STAMP_URL}" ] || [ ! -f "${STAMP_SHA}" ]; } && return 1
  { [ -n "${PKG_SHA256}" ] && [ "$(cat ${STAMP_SHA} 2>/dev/null)" != "${PKG_SHA256}" ]; } && return 1
  return 0
}

# Latest file already present, exit now...
_get_file_already_downloaded && exit 0

lock_source_dir "${1}"

# Check again in case of concurrent access - if nothing needs to be downloaded, exit now...
_get_file_already_downloaded && exit 0

# At this point, we need to download something...
build_msg "CLR_GET" "GET" "${1} (archive)" "indent"

pkg_lock_status "GETPKG" "${PKG_NAME}" "unpack" "downloading package..."

PACKAGE_MIRROR="${DISTRO_MIRROR}/${PKG_NAME}/${PKG_SOURCE_NAME}"

[ "${VERBOSE}" != "yes" ] && GET_OPT="--silent --show-error"
GET_CMD="curl ${GET_OPT} --fail --connect-timeout 30 --retry 3 --continue-at - --location --max-redirs 5 --output ${PACKAGE}"

# unset LD_LIBRARY_PATH to stop wget from using toolchain/lib and loading libssl.so/libcrypto.so instead of host libraries
unset LD_LIBRARY_PATH

rm -f "${STAMP_URL}" "${STAMP_SHA}"

NBGET=10
NBCHKS=2
while [ ${NBGET} -gt 0 ] && [ ${NBCHKS} -gt 0 ]; do
  for url in "${PKG_URL}" "${PACKAGE_MIRROR}"; do
    rm -f "${PACKAGE}"
    if ${GET_CMD} "${url}"; then
      CALC_SHA256=$(sha256sum "${PACKAGE}" | cut -d" " -f1)

      { [ -z "${PKG_SHA256}" ] || [ "${PKG_SHA256}" = "${CALC_SHA256}" ]; } && break 2

      if [ "${CHANGE_HASH}" = "yes" ]; then
        sed -e "s|^PKG_SHA256=.*|PKG_SHA256=\"${CALC_SHA256}\"|" -i "${PKG_DIR}/package.mk"
        break 2
      else
        build_msg "CLR_WARNING" "WARNING" "Incorrect checksum calculated on downloaded file: got ${CALC_SHA256} wanted ${PKG_SHA256}"
        NBCHKS=$((NBCHKS - 1))
      fi
    fi
  done
  NBGET=$((NBGET - 1))
done

if [ ${NBGET} -eq 0 ] || [ ${NBCHKS} -eq 0 ]; then
  die "\nCannot get ${1} sources : ${PKG_URL}\nTry later!"
else
  build_msg "CLR_INFO" "INFO" "Calculated checksum: ${CALC_SHA256}"
  echo "${PKG_URL}" > "${STAMP_URL}"
  echo "${CALC_SHA256}" > "${STAMP_SHA}"
fi