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

BACKUP_DIR=/mnt/backups/media
DB_BACKUP_DIR="$BACKUP_DIR/backups"
LOG="$BACKUP_DIR/backup.log"
RETAIN_DAYS=14

mkdir -p "$DB_BACKUP_DIR"

echo "[$(date)] Starting Immich backup" >> "$LOG"

# 1. Database dump (must come before file sync)
DUMP_FILE="$DB_BACKUP_DIR/immich-db-$(date +%Y%m%dT%H%M%S).sql.gz"
docker exec immich_postgres pg_dump --clean --if-exists \
  --dbname=immich --username=postgres | gzip > "$DUMP_FILE"
echo "[$(date)] DB dump: $DUMP_FILE" >> "$LOG"

# 2. Rsync critical asset folders (skip thumbs and encoded-video — regeneratable)
for DIR in library upload profile; do
  rsync -a --delete /mnt/media/upload/$DIR/ "$BACKUP_DIR/$DIR/" >> "$LOG" 2>&1
  echo "[$(date)] Synced $DIR" >> "$LOG"
done

# 3. Remove old DB dumps
find "$DB_BACKUP_DIR" -name "immich-db-*.sql.gz" -mtime +$RETAIN_DAYS -delete
echo "[$(date)] Cleaned dumps older than ${RETAIN_DAYS}d" >> "$LOG"

touch "$BACKUP_DIR/.last_sync"
echo "[$(date)] Immich backup complete" >> "$LOG"