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

SOURCE_DIR="/home/urban/docker/unifi/config/data/backup/autobackup"
## SOURCE_DIR="/home/urban/docker/unifi/config/data/backup"
REMOTE_HOST="backupserver"
REMOTE_DIR="/storage/disk3/backup/unifi/daily"
LOG_TAG="unifi-backup"

log() {
    printf '%s [%s] %s\n' \
        "$(date --iso-8601=seconds)" \
        "$LOG_TAG" \
        "$*"
}

if [[ ! -d "$SOURCE_DIR" ]]; then
    log "Fel: backupkatalogen saknas: $SOURCE_DIR" >&2
    exit 1
fi

LATEST_BACKUP="$(
    find "$SOURCE_DIR" -maxdepth 1 -type f \
        \( -name '*.unf' -o -name '*.unifi' \) \
        -printf '%T@ %p\n' |
    sort -nr |
    head -n 1 |
    cut -d' ' -f2-
)"

if [[ -z "${LATEST_BACKUP:-}" ]]; then
    log "Fel: hittade ingen UniFi-backup i $SOURCE_DIR" >&2
    exit 1
fi

if [[ ! -s "$LATEST_BACKUP" ]]; then
    log "Fel: backupfilen är tom: $LATEST_BACKUP" >&2
    exit 1
fi

TIMESTAMP="$(date '+%Y-%m-%d_%H-%M-%S')"
BASENAME="$(basename "$LATEST_BACKUP")"
REMOTE_NAME="${TIMESTAMP}_${BASENAME}"

log "Kopierar $LATEST_BACKUP till ${REMOTE_HOST}:${REMOTE_DIR}/${REMOTE_NAME}"

ssh "$REMOTE_HOST" "mkdir -p '$REMOTE_DIR'"

rsync \
    --archive \
    --compress \
    --partial \
    --chmod=F600,D700 \
    "$LATEST_BACKUP" \
    "${REMOTE_HOST}:${REMOTE_DIR}/${REMOTE_NAME}"

log "Verifierar fjärrfilen"

LOCAL_SIZE="$(stat -c '%s' "$LATEST_BACKUP")"
REMOTE_SIZE="$(
    ssh "$REMOTE_HOST" \
      "stat -c '%s' '$REMOTE_DIR/$REMOTE_NAME'"
)"

if [[ "$LOCAL_SIZE" != "$REMOTE_SIZE" ]]; then
    log "Fel: storleken skiljer sig: lokal=$LOCAL_SIZE remote=$REMOTE_SIZE" >&2
    exit 1
fi

ssh "$REMOTE_HOST" \
  "find '$REMOTE_DIR' -maxdepth 1 -type f -mtime +90 -delete"
log "Backup klar: ${REMOTE_DIR}/${REMOTE_NAME}"