#!/bin/bash

################################################################################
#      This file is part of LibreELEC - https://libreelec.tv
#      Copyright (C) 2017-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/>.
################################################################################

. config/options $1

_get_file_already_downloaded() {
  if [ -f $PACKAGE ]; then
    if [ "$(cat $STAMP_URL 2>/dev/null)" == "${PKG_URL}" ]; then
      [ -z "${PKG_SHA256}" -o "$(cat $STAMP_SHA 2>/dev/null)" == "${PKG_SHA256}" ] && return 0
    fi
  fi
  return 1
}

if [ -z "$1" ]; then
  for i in `find packages/ -type f -name package.mk`; do
    GET_PKG=`grep ^PKG_NAME= $i | sed -e "s,\",,g" -e "s,PKG_NAME=,,"`
    $SCRIPTS/get $GET_PKG
  done
fi

[ -z "$PKG_URL" -o -z "$PKG_SOURCE_NAME" ] && exit 0

mkdir -p $SOURCES/$1

PACKAGE="$SOURCES/$1/$PKG_SOURCE_NAME"
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"

STAMP_URL="$PACKAGE.url"
STAMP_SHA="$PACKAGE.sha256"

# Latest file already present, exit now...
_get_file_already_downloaded $1 && exit 0

# Avoid concurrent downloads of the same package
_isblocked=N
exec 99<$SOURCES/$1
while ! flock --nonblock --exclusive 99; do
  [ ${_isblocked} == N ] && { echo "Project/Device ${DEVICE:-${PROJECT}} waiting, to avoid concurrent download of ${1}..."; _isblocked=Y; }
  sleep 1
done

# Check again in case of concurrent access - if nothing needs to be downloaded, exit now...
_get_file_already_downloaded $1 && exit 0

# At this point, we need to download something...
printf "%${BUILD_INDENT}c ${boldcyan}GET${endcolor}      $1\n" ' '>&$SILENT_OUT
export BUILD_INDENT=$((${BUILD_INDENT:-1}+$BUILD_INDENT_SIZE))

# 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
  rm -f $PACKAGE

  if $WGET_CMD "$PKG_URL" || $WGET_CMD "$PACKAGE_MIRROR"; then
    CALC_SHA256="$(sha256sum $PACKAGE | cut -d" " -f1)"

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

    printf "${boldred}WARNING${endcolor} Incorrect checksum calculated on downloaded file: got ${CALC_SHA256}, wanted ${PKG_SHA256}\n\n"
  fi
  NBWGET=$((NBWGET - 1))
done

if [ $NBWGET -eq 0 ]; then
  echo -e "\nCant't get $1 sources : $PKG_URL\n Try later !!"
  exit 1
else
  printf "${boldgreen}INFO${endcolor} Calculated checksum is: ${CALC_SHA256}\n\n"
  echo "${PKG_URL}" > $STAMP_URL
  echo "${CALC_SHA256}" > $STAMP_SHA
fi

exit 0