#!/bin/bash -eu

LOGFILE=/tmp/archive-teslacam-clips.log

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

function mount_mountpoint () {
  local mount_point="$1"
  log "Mounting $mount_point..."

  local mounted=true
  mount "$mount_point" >> "$LOGFILE" 2>&1 || mounted=false
  if [ "$mounted" = true ]
  then
    log "Mounted $mount_point."
    true
    return
  else
    log "Failed to mount $mount_point."
    false
    return
  fi
}

function ensure_mountpoint_is_mounted () {
  local mount_point="$1"
  local mount_exists=true

  findmnt --mountpoint "$mount_point" > /dev/null || mount_exists=false

  if [ "$mount_exists" = true ]
  then
    log "$mount_point is already mounted."
  else
    mount_mountpoint "$mount_point"
  fi
}

function move_clips_to_archive () {
  log "Moving clips to archive..."
  for file_name in /mnt/usb_share/TeslaCam/saved*; do
    [ -e "$file_name" ] || continue
    log "Moving $file_name ..."
    mv -- "$file_name" /mnt/cam_archive >> "$LOGFILE" 2>&1
    log "Moved $file_name."
  done
  log "Finished moving clips to archive."
}

function disconnect_usb_from_host () {
  log "Disconnecting usb from host..."
  modprobe -r g_mass_storage
  log "Disconnected usb from host."
}

function mount_usb_drive_locally () {
  log "Mounting usb locally..."
  mount /mnt/usb_share
  log "Mounted usb locally."
}

function ensure_cam_archive_is_mounted () {
  log "Ensuring cam archive is mounted..."
  ensure_mountpoint_is_mounted /mnt/cam_archive
  log "Ensured cam archive is mounted."
}

function ensure_usb_share_is_mounted () {
  log "Ensuring usb share is mounted..."
  ensure_mountpoint_is_mounted /mnt/usb_share
  log "Ensured usb share is mounted."
}

function unmount_usb_share () {
  log "Unmounting usb share..."
  umount /mnt/usb_share
  log "Unmounted usb share."
}

function connect_usb_to_host() {
  log "Connecting usb to host..."
  modprobe g_mass_storage
  log "Connected usb to host."
}

log "Starting..."

ensure_cam_archive_is_mounted

disconnect_usb_from_host

ensure_usb_share_is_mounted

move_clips_to_archive

unmount_usb_share

connect_usb_to_host