#!/bin/sh

# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2021-present Team LibreELEC (https://libreelec.tv)

TMP=/tmp/mnt/

SYSTEM_SIZE=@SYSTEM_SIZE@
UUID_SYSTEM="$(date '+%d%m')-$(date '+%M%S')"
UUID_STORAGE="$(uuidgen)"
BOOT=$(grep /flash /proc/mounts | awk '{print $1}' | sed 's/p[012]//g')
DISK=""

for TYPE in /sys/class/block/mmcblk*/device/type; do
  if grep -q "MMC" "${TYPE}"; then
    DISK="/dev/$(echo "${TYPE}" | awk -F/ '{print $5}')"
    break
  fi
done

if [ -z "${DISK}" ]; then
  echo "Can't find eMMC module!"
  exit 1
fi

if [ "${BOOT}" = "${DISK}" ]; then
  echo "Your device is booted from the eMMC module!"
  exit 1
fi

echo ""
echo -e "\033[36m==============================="
echo "Installing @DISTRONAME@ to eMMC"
echo -e "===============================\033[37m"
echo ""
echo "eMMC found at ${DISK}"
echo ""

if [ ! -b "${DISK}" ]; then
    echo "Error: eMMC not found."
    exit 1
fi

echo ""
echo -n "WARNING: ALL DATA ON eMMC WILL BE ERASED! Continue (y/N)?  "
read -n 1 ANSWER

if [ ! "${ANSWER}" = "y" ]; then
  echo ""
  echo "Aborting..."
  exit 0
fi
echo ""

umount ${DISK}* > /dev/null 2>&1

echo "Erasing eMMC ..."
dd if=/dev/zero of="${DISK}" bs=1M count=1 conv=fsync > /dev/null 2>&1

echo "Creating partitions"
parted -s "${DISK}" mklabel msdos
parted -s "${DISK}" -a optimal mkpart primary fat32 0% ${SYSTEM_SIZE}MiB
parted -s "${DISK}" set 1 boot on
parted -s "${DISK}" -a optimal mkpart primary ext4 ${SYSTEM_SIZE}MiB 100%
sync

echo "Creating filesystems"
dd if=/dev/zero of="${DISK}p1" bs=1M count=1 conv=fsync > /dev/null 2>&1
mkfs.vfat -n SYSTEM -i ${UUID_SYSTEM//-/} ${DISK}p1 > /dev/null 2>&1
dd if=/dev/zero of="${DISK}p2" bs=1M count=1 conv=fsync > /dev/null 2>&1
mkfs.ext4 -L STORAGE -U ${UUID_STORAGE} ${DISK}p2 > /dev/null 2>&1
sync

echo "Installing bootloader"
dd if="${BOOT}" skip=8 of="${DISK}" bs=1k seek=8 count=768 conv=fsync > /dev/null 2>&1

echo "Copying system files"

mkdir -p ${TMP}

mount -t vfat ${DISK}p1 ${TMP}

cp -R /flash/. ${TMP}/
sync

echo "Adjusting partition UUIDs"

sed -i "s/boot=UUID=[0-9a-f\-]*/boot=UUID=${UUID_SYSTEM}/g" ${TMP}/extlinux/extlinux.conf
sed -i "s/disk=UUID=[0-9a-f\-]*/disk=UUID=${UUID_STORAGE}/g" ${TMP}/extlinux/extlinux.conf

umount ${TMP}

echo "Done"