#!/bin/bash
# SPDX-License-Identifier: Apache-2.0
# Copyright (C) 2021-present Fewtarius (https://github.com/fewtarius)

if [ -z "$1" ]
then
  export OS_VERSION=$(date +%Y%m%d)
else
  OS_VERSION=$1
fi

if [ -z "${DISTRO}" ] || [ -z "${DEVICE}" ] || [ -z "${ARCH}" ]
then
  echo "Environment variables DISTRO, DEVICE, and ARCH must be set.  Aborting."
  exit 1
fi

MAXSIZE="64000000"

SDDEVICES=($(awk '/sd*[a-z]$/ {print $3":"$4}' /proc/partitions))

for SDDEVICE in ${SDDEVICES[@]}
do
  SIZE=${SDDEVICE%:*}
  SDDEVICE=${SDDEVICE#*:}
  if [ "${SIZE}" -le "${MAXSIZE}" ]
  then
    echo "Found SD Card @ ${SDDEVICE}"
    break
  fi
  unset SDDEVICE
done

if [ ! -z "${SDDEVICE}" ]
then
  if [ -e "release/${DISTRO}-${DEVICE}.${ARCH}-${OS_VERSION}.img" ] || [ -e "release/${DISTRO}-${DEVICE}.${ARCH}-${OS_VERSION}.img.gz" ]
  then
    cd release
    echo "Extracting ${DISTRO}-${DEVICE}.${ARCH}-${OS_VERSION}.img"
    gunzip ${DISTRO}-${DEVICE}.${ARCH}-${OS_VERSION}.img.gz 2>/dev/null

    echo "Writing ${DISTRO}-${DEVICE}.${ARCH}-${OS_VERSION}.img to ${SDDEVICE}"
    sudo dd if=${DISTRO}-${DEVICE}.${ARCH}-${OS_VERSION}.img of=/dev/${SDDEVICE} bs=1M
    sync
  else
    echo "Release not found, aborting."
    exit 1
  fi
else
  echo "SD Card could not be found, aborting."
  exit 1
fi