################################################################################
#      This file is part of LibreELEC - https://libreelec.tv
#      Copyright (C) 2018-present Team LibreELEC
#
#  LibreELEC is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 2 of the License, or
#  (at your option) any later version.
#
#  LibreELEC is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with LibreELEC.  If not, see <http://www.gnu.org/licenses/>.
################################################################################

_get_file_already_downloaded() {
  [ ! -f $PACKAGE -o ! -f $STAMP_URL -o ! -f $STAMP_SHA ] && return 1
  [ -n "${PKG_SHA256}" -a "$(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...
printf "%${BUILD_INDENT}c $(print_color CLR_GET "GET")      $1 (archive)\n" ' '>&$SILENT_OUT
export BUILD_INDENT=$((${BUILD_INDENT:-1}+$BUILD_INDENT_SIZE))

PACKAGE_MIRROR="$DISTRO_MIRROR/$PKG_NAME/$PKG_SOURCE_NAME"
[ "$VERBOSE" != "yes" ] && WGET_OPT=-q
WGET_CMD="wget --timeout=30 --tries=3 --passive-ftp --no-check-certificate -c $WGET_OPT -O $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

NBWGET=10
while [ $NBWGET -gt 0 ]; do
  for url in "$PKG_URL" "$PACKAGE_MIRROR"; do
    rm -f $PACKAGE
    if $WGET_CMD "$url"; then
      CALC_SHA256="$(sha256sum $PACKAGE | cut -d" " -f1)"

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

      printf "%${BUILD_INDENT}c $(print_color CLR_WARNING "WARNING") Incorrect checksum calculated on downloaded file: got ${CALC_SHA256}, wanted ${PKG_SHA256}\n\n" ' '>&$SILENT_OUT
    fi
  done
  NBWGET=$((NBWGET - 1))
done

if [ $NBWGET -eq 0 ]; then
  echo -e "\nCant't get $1 sources : $PKG_URL\n Try later !!"
  exit 1
else
  printf "%${BUILD_INDENT}c $(print_color CLR_INFO "INFO") Calculated checksum: ${CALC_SHA256}\n\n" ' '>&$SILENT_OUT
  echo "${PKG_URL}" > $STAMP_URL
  echo "${CALC_SHA256}" > $STAMP_SHA
fi