#!/usr/bin/env bash
set -Eeuo pipefail

SRC="${HOME}/"
DEST_BASE="/run/media/hans/usbsicherung/jacboy_sicherung"
HOST="$(hostname -s)"
STAMP="$(date +%F_%H-%M-%S)"
SNAPSHOT_DIR="${DEST_BASE}/${HOST}/${STAMP}"
LAST_LINK="${DEST_BASE}/${HOST}/latest"
LOG_DIR="${DEST_BASE}/${HOST}/logs"
LOG_FILE="${LOG_DIR}/backup-${STAMP}.log"
KEEP=30

mkdir -p "${SNAPSHOT_DIR}" "${LOG_DIR}"

RSYNC_OPTS=(
  -aHAXx
  --numeric-ids
  --delete
  --delete-excluded
  --info=stats2,progress2
  --human-readable
  --partial
)

EXCLUDES=(
  --exclude=".cache/"
  --exclude="Downloads/"
  --exclude=".local/share/Trash/"
  --exclude=".gvfs/"
  --exclude=".dotnet/"
  --exclude=".codegpt/"
  --exclude=".copilot/"
  --exclude=".var/"
  --exclude=".vscode/"
  --exclude="temp/"
)

if [ -L "${LAST_LINK}" ] && [ -d "$(readlink -f "${LAST_LINK}")" ]; then
  RSYNC_OPTS+=(--link-dest="$(readlink -f "${LAST_LINK}")")
fi

rsync "${RSYNC_OPTS[@]}" \
  "${EXCLUDES[@]}" \
  "${SRC}" "${SNAPSHOT_DIR}/" | tee "${LOG_FILE}"

ln -sfn "${SNAPSHOT_DIR}" "${LAST_LINK}"

cd "${DEST_BASE}/${HOST}"
ls -1dt 20* | tail -n +$((KEEP + 1)) | xargs -r rm -rf