#!/bin/bash -eu

USER_ENABLED_PUSHOVER=false

REPO=${REPO:-cimryan}

BRANCH=${BRANCH:-master}

if ! [ $(id -u) = 0 ]
then
  echo "STOP: Run sudo -i."
  exit 1
fi

function check_variable () {
  local var_name="$1"
  if [ -z "${!var_name+x}" ]
  then
    echo "STOP: Define the variable $var_name like this: export $var_name=value"
    exit 1
  fi
}

function check_pushover_enabled () {
  if [ ! -z "${pushover_enabled+x}" ]
  then
    if [ ! -n "${pushover_user_key+x}" ] || [ ! -n "${pushover_app_key+x}"  ]
    then
      echo "STOP: You're trying to setup Pushover but didn't provide your User and/or App key."
      echo "Define the variables like this:"
      echo "export pushover_user_key=put_your_userkey_here"
      echo "export pushover_app_key=put_your_appkey_here"
      exit 1
    elif [ "${pushover_user_key}" = "put_your_userkey_here" ] || [  "${pushover_app_key}" = "put_your_appkey_here" ]
    then
      echo "STOP: You're trying to setup Pushover, but didn't replace the default User and App key values."
      exit 1
    else
      USER_ENABLED_PUSHOVER=true
      echo "export pushover_enabled=true" > /root/.teslaCamPushoverCredentials
      echo "export pushover_user_key=$pushover_user_key" >> /root/.teslaCamPushoverCredentials
      echo "export pushover_app_key=$pushover_app_key" >> /root/.teslaCamPushoverCredentials
    fi
  fi
}

function check_available_space () {
  echo "Verifying that there is sufficient space available on the MicroSD card..."

  local available_space="$( parted -m /dev/mmcblk0 u b print free | tail -1 | cut -d ":" -f 4 | sed 's/B//g' )"

  if [ "$available_space" -lt  4294967296 ]
  then
    echo "STOP: The MicroSD card is too small."
    exit 1
  fi

  echo "There is sufficient space available."
}

function get_script () {
  local local_path="$1"
  local name="$2"
  local remote_path="${3:-}"
  
  wget -O "$local_path/$name" https://raw.githubusercontent.com/"$REPO"/teslausb/"$BRANCH"/"$remote_path"/"$name"
  chmod +x "$local_path/$name"
}

function get_ancillary_setup_scripts () {
  get_script /tmp create-backingfiles-partition.sh
  get_script /tmp create-backingfiles.sh
  get_script /tmp make-root-fs-readonly.sh
}

function fix_cmdline_txt_modules_load ()
{
  echo "Fixing the modules-load parameter in /boot/cmdline.txt..."
  cp /boot/cmdline.txt ~
  cat ~/cmdline.txt | sed 's/ modules-load=dwc2,g_ether/ modules-load=dwc2/' > /boot/cmdline.txt
  rm ~/cmdline.txt
  echo "Fixed cmdline.txt."
}

BACKINGFILES_MOUNTPOINT=/backingfiles

function create_usb_drive_backing_files () {
  if [ ! -e "$BACKINGFILES_MOUNTPOINT" ]
  then
    mkdir "$BACKINGFILES_MOUNTPOINT"
  fi

  if [ ! -e /dev/mmcblk0p3 ]
  then
    /tmp/create-backingfiles-partition.sh "$BACKINGFILES_MOUNTPOINT"
  fi
  
  if ! findmnt --mountpoint /backingfiles
  then
    echo "Mounting the partition for the backing files..."
    mount /backingfiles
    echo "Mounted the partition for the backing files."
  fi

  if [! -e /backingfiles/*.bin ]
  then
    /tmp/create-backingfiles.sh "$campercent" "$BACKINGFILES_MOUNTPOINT"
  fi
}

function configure_archive_scripts () {
  echo "Configuring the archive scripts..."

  get_script /root/bin archiveloop
  get_script /root/bin archive-teslacam-clips

  if [ $RSYNC_ENABLE = true ]
  then
    get_script /root/bin archive-clips.sh rsync_archive
    get_script /root/bin connect-archive.sh rsync_archive
    get_script /root/bin disconnect-archive.sh rsync_archive
  else
    get_script /root/bin archive-clips.sh cifs_archive
    get_script /root/bin connect-archive.sh cifs_archive
    get_script /root/bin disconnect-archive.sh cifs_archive
  fi

  get_script /root/bin remountfs_rw
  
  echo "Configured the archive scripts."
}

function configure_pushover_scripts() {
  get_script /root/bin send-pushover
}

function configure_rc_local () {
  if grep -q archiveloop /etc/rc.local
  then
    return
  fi
  
  echo "Configuring /etc/rc.local to run the archive scripts at startup..."
  echo "#!/bin/bash -eu" > ~/rc.local
  # Get everything but the last two lines
  tail -n +2 /etc/rc.local | sed '$d' >> ~/rc.local

  echo "archiveserver=\"${archiveserver}\"" >> ~/rc.local
cat << 'EOF' >> ~/rc.local
LOGFILE=/tmp/rc.local.log

function log () {
  echo "$( date )" >> "$LOGFILE"
  echo "$1" >> "$LOGFILE"
}

log "Launching archival script..."
/root/bin/archiveloop "$archiveserver" &
log "All done"
exit 0
EOF

  cat ~/rc.local >> /etc/rc.local
  rm ~/rc.local
  echo "Configured rc.local."
}

function configure_hostname () {
  echo "Configuring the hostname..."

  local new_host_name="teslausb"
  cp /etc/hosts ~
  sed "s/raspberrypi/$new_host_name/g" ~/hosts > /etc/hosts

  cp /etc/hostname ~
  sed "s/raspberrypi/$new_host_name/g" ~/hostname > /etc/hostname
  echo "Configured the hostname."
}

function make_root_fs_readonly () {
  /tmp/make-root-fs-readonly.sh
}

echo "Verifying environment variables..."

RSYNC_ENABLE="${RSYNC_ENABLE:-false}"

if [ "$RSYNC_ENABLE" = true ]
then
  check_variable "RSYNC_USER"
  check_variable "RSYNC_SERVER"
  export archiveserver="$RSYNC_SERVER"
  check_variable "RSYNC_PATH"
else # Else for now, TODO allow both for more redundancy?
  check_variable "sharename"
  check_variable "shareuser"
  check_variable "sharepassword"
  
  export cifs_version="${cifs_version:-3}"
fi

check_variable "archiveserver"
check_variable "campercent"

check_pushover_enabled

if [ ! -e /root/bin ]
then
  mkdir /root/bin
fi

if [ "$RSYNC_ENABLE" = true ]
then
  get_script /root/bin verify-archive-configuration.sh rsync_archive
  get_script /root/bin configure-archive.sh rsync_archive
else
  get_script /root/bin verify-archive-configuration.sh cifs_archive
  get_script /root/bin configure-archive.sh cifs_archive
  get_script /root/bin write-archive-credentials-to.sh cifs_archive
fi

get_script /root/bin get-archiveserver-ip-address.sh

/root/bin/verify-archive-configuration.sh

check_available_space

get_ancillary_setup_scripts

pushd ~

configure_archive_scripts

configure_pushover_scripts

fix_cmdline_txt_modules_load

echo "" >> /etc/fstab

create_usb_drive_backing_files

/root/bin/configure-archive.sh

configure_rc_local

configure_hostname

make_root_fs_readonly

echo "All done."