#!/bin/bash

read_config() {
  # variables
  #CACHE_DIR="$HOME/.cache/restic"
  #BACKUP_PATHS="/etc /home/docker/volumes /root"
  #EXCLUDES_FILE="$HOME/.config/restic/excludes"
  #KEEP_HOURS=96
  #KEEP_DAYS=31
  #KEEP_WEEKS=8
  #KEEP_MONTHS=12
  #KEEP_YEARS=3
  #RESTIC_PASSWORD="PASSWORD"
  #RESTIC_REPOSITORY="sftp://foo@192.168.0.1:22//home/bar"
  # or for b2
  #RESTIC_REPOSITORY="b2:backup"
  #B2_ACCOUNT_ID="ID"
  #B2_ACCOUNT_KEY="KEY"

  if [[ ! -f "$HOME/.config/restic/env" && ! -f "/etc/restic/env" ]]; then
    echo "no config provided"
    exit 1
  fi

  . $HOME/.config/restic/env 2> /dev/null || . /etc/restic/env 2> /dev/null
  export RESTIC_PASSWORD="${RESTIC_PASSWORD}"
}

info() { printf "\n\e[1m%s\e[0m\n" "$*" >&2; }

info "Testing if restic is already running..."
if pgrep -x "restic" &> /dev/null; then
  echo "-> Restic is already runnning"
  exit 1
fi
info "Done"

info "Updating restic..."
$HOME/.local/bin/restic self-update
info "Done"

read_config

restic -r ${RESTIC_REPOSITORY} unlock
if [[ $1 == 'prune' ]]; then
  info "Pruning snapshots..."
  $HOME/.local/bin/restic --cache-dir ${CACHE_DIR} -r ${RESTIC_REPOSITORY} prune --max-unused 0
  info "Done"

  info "Checking repository..."
  $HOME/.local/bin/restic -r ${RESTIC_REPOSITORY} check
  info "Done"
else
  if ! eval which snapper 2> /dev/null; then
    # fallback
    BACKUP_PATHS="/home/flexo"
  fi

  info "Starting backup..."
  $HOME/.local/bin/restic --cache-dir ${CACHE_DIR} -r ${RESTIC_REPOSITORY} backup ${BACKUP_PATHS} \
    --exclude-file ${EXCLUDES_FILE}
  info "Done"

  info "Forgetting snapshots..."
  $HOME/.local/bin/restic --cache-dir ${CACHE_DIR} -r ${RESTIC_REPOSITORY} forget \
    --keep-hourly ${KEEP_HOURS} --keep-daily ${KEEP_DAYS} \
    --keep-weekly ${KEEP_WEEKS} --keep-monthly ${KEEP_WEEKS} \
    --keep-yearly ${KEEP_YEARS} #--prune
  info "Done"
fi