#!/bin/bash

readonly toolName=backup
readonly toolBin=rsync

sq_aptOpt=
sq_config=0

seq_config() {
  if initSeqConfig -t "${seq_configName:?}" "${seq_configTemplate:?}" ; then
    sq_config=1
  else
    error -e "Check output for errors"
    # End if no configuration file exists
    dry || return 1
  fi

  interactive || sq_aptOpt="-y"
  return 0
}

step_1_info() { 
  echo "Backup root"
  echoinfo "Essential excludes are provided in the configuration template."
  echoinfo "(${seq_configTemplate})"
}
step_1_options() { echo "[ADDITIONAL_EXCLUDES...]"; }
step_1_alias() { echo "buroot"; }
step_1() {
  local buTarget="/backup"
  if (( ! sq_config )) ; then
    error -e "Cannot backup root without properly configured excludes"
    error -e "     (expected config: ${seq_configFile})"
  else
    buTarget="$BACKUP_TARGET"
  fi

  # don't use step number
  shift

  step budir / "$buTarget" "${BACKUP_EXCLUDES[@]}" "$@"
}

step_3_info() { 
  # Backup single directory recursively
  local opt=
  local dir=
  local tar=
  local exc=
  shift
  if [ "${1:-}" == "-t" ] ; then
    opt=" -t     "
    shift
  fi
  if [ -n "${1:-}" ] ; then
    dir="$1"
    shift
    if [ -z $opt ] && [ -n "$1" ] ; then
      tar="$1"
      shift
    else
      tar="$BACKUP_TARGET"
    fi
    if [ -n "${1:-}" ] ; then
      exc="$@"
    else
      exc="[NO EXCLUDES]"
    fi
  fi
  echo     "Backup $opt $dir $tar $exc"
  echoinfo " -t : Using configuration value as TARGET"
  echoinfo "      <DIRECTORY> [EXCLUDES...]"
  echoinfo "EXCLUDES path notation starts within $dir"
  echoinfo " e.g. to exclude $dir/a:"
  echoinfo " $0 budir $dir $tar /a"
}
step_3_options() { echo "[OPTION] <DIRECTORY> [TARGET] [EXCLUDES...]"; }
step_3_alias() { echo "budir"; }
step_3() {
  local configTarget=0
  local noRemount=0
  local buSource=
  local buTarget=
  local buExcludes=
  local buLog=
  # don't use step number
  shift

  for _ in "$@"; do
    case "$1" in
      -t)
        configTarget=1
        shift;;
      -n)
        noRemount=1
        shift;;
    esac
  done

  if [ -z "$1" ] ; then
    error -e "Nothing found to backup $1"
    exit 1
  fi

  buLog=$(basename $1)
  if [ "$buLog" == "/" ] ; then
    buLog="root"
    buSource="$1"
  else
    # remove trailing slashes
    buSource=$(echo "$1" | sed 's:/*$::')
  fi
  buLog="backup_${buLog}"
  shift

  if [ $configTarget -ne 0 ] && (( sq_config )) ; then
    # Taking target from config
    buTarget=$(echo "$BACKUP_TARGET" | sed 's:/*$::')
  else
    if [ -z "$1" ] ; then
      error -e "No valid target found"
      exit 1
    fi
    buTarget=$(echo "$1" | sed 's:/*$::')
    shift
  fi
  if [ ! -d "${buTarget}" ] && [ ! -L "${buTarget}" ]
  then
    error -e "Backup target (${buTarget}) doesn't exist"
    exit 1
  fi

  for exclu in "$@"; do
    buExcludes+=("--exclude='$exclu'")
  done

  info "Source  : $buSource"
  info "Target  : $buTarget"
  info "Excludes: $@"

  #fix doubling trailing slash on verbose output when backing up root
  local tmpSource="$buSource/"
  local tmpTarget="${buTarget}/$(basename ${buSource})"
  if [ "$buSource" == "/" ] ; then
    tmpSource="/"
    tmpTarget="${buTarget}/"
  fi

  if [ $noRemount -eq 0 ]; then
    # remount target to be writable
    exep "mount -o rw,remount '${buTarget}' >>/dev/null 2>&1"
    endReturn -o $? "Remount (${buTarget}) to be writable failed"
  fi

  if [ ! -w "${buTarget}" ] ; then 
    error -e "Backup target (${buTarget}) is not writable"
    exit 1
  fi

  checkInstalled 
  exep "mv -f ${buTarget}/${buLog}0.log /tmp/${buLog}1.log 2>/dev/null"
  exep "$toolBin -avxHAX --delete --info=stats2 ${buExcludes[*]} ${tmpSource} ${tmpTarget} > /tmp/${buLog}0.log"

  exe mv -f /tmp/${buLog}*.log ${buTarget}
  exe sync
  exep "mount -o ro,remount '${buTarget}' >>/dev/null 2>&1"
}

step_100_info() { echo "Install $toolBin"; }
step_100_alias() { echo "install"; }
step_100() {
  exe apt update
  exe apt install $toolBin ${sq_aptOpt}
}

checkInstalled() {
  command -v $toolBin >>/dev/null
  if [ $? -ne 0 ] ; then
    step install
  fi
  toolBin="$(command -v $toolBin)"
}

# shellcheck disable=SC2034 # Appears unused
readonly sqr_minVersion=16
# shellcheck disable=SC1091 # Don't follow this source
. /usr/local/bin/sequencer.sh