#!/usr/bin/env bash
set -euo pipefail

if [ $# -lt 1 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
  echo "Usage: $0 RELEASE_DESCRIPTORS..."
  echo "Example: $0 alpha:1786.0.0 beta:1781.2.0"
  echo "Downloads the release update payloads to ARCH-usr/VERSION/ folders."
  echo "Expected to be run in .../sdk/src/scripts/data/"
  echo "(usually before entering the chroot and running ./generate_payload data/ARCH-usr/VERSION/ keys/)."
  exit 1
fi

if [ "$(basename "${PWD}")" != "data" ] || [ "$(basename "$(readlink -f ..)")" != "scripts" ]; then
  echo "Expected to be run in .../sdk/src/scripts/data/" >&2
  exit 1
fi

# Same as in copy-to-origin.sh and set-symlink.sh
for TUPLE_COL in "$@"; do
  IFS=":" read -r -a TUPLE <<< "${TUPLE_COL}"
  CHANNEL="${TUPLE[0]}"
  VERSION="${TUPLE[1]}"
  for ARCH in amd64 arm64; do
    echo "Downloading ${CHANNEL} ${VERSION} ${ARCH}"
    rm -rf "${ARCH}-usr/${VERSION}"
    mkdir -p "${ARCH}-usr/${VERSION}" && cd "${ARCH}-usr/${VERSION}"
    BASEURL="https://bincache.flatcar-linux.net/images/${ARCH}/${VERSION}/"
    # Note: Don't replace this with 'mapfile -t array < <(curl)' or 'read -r -a array <<< "$(curl)"' because that has no error checking
    EXTRA_PAYLOADS=($(curl -H 'Accept: application/json' -fsSL "${BASEURL}" | jq -r ".[].name" | { grep -P '^(oem|flatcar)-.*raw(.sig)?$' || true ; }))
    wget "${BASEURL}"{flatcar_production_update.bin.bz2,flatcar_production_update.bin.bz2.sig,flatcar_production_image.vmlinuz,flatcar_production_image.vmlinuz.sig}
    for EXTRA_PAYLOAD in "${EXTRA_PAYLOADS[@]}"; do
      wget "${BASEURL}${EXTRA_PAYLOAD}"
    done
    cd ../..
  done
done
echo "Success"