#!/bin/bash
# Daily backup via Pythons sqlite3.backup() — atomar, async-DB-safe,
# kein sqlite3-CLI im Container vorausgesetzt.
#
# Usage:
#   ./scripts/backup-db.sh                            # Default: prod
#   ./scripts/backup-db.sh gwoe-antragspruefer-dev    # dev
#
# Auto-Detect: BACKUP_DIR wird aus dem Skript-Pfad abgeleitet
# (parent-of-scripts/.../backups), damit die gleiche Datei via
# `git pull` auf prod und dev funktioniert ohne pfad-spezifisches Hardcoding.
set -euo pipefail

CONTAINER="${1:-gwoe-antragspruefer}"
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
BACKUP_DIR="${BACKUP_DIR:-$PROJECT_DIR/backups}"
TS=$(date +%Y%m%d-%H%M%S)

mkdir -p "$BACKUP_DIR"

docker exec "$CONTAINER" python -c "
import sqlite3
src = sqlite3.connect(\"/app/data/gwoe-antraege.db\")
dst = sqlite3.connect(\"/tmp/db-backup.db\")
src.backup(dst); dst.close(); src.close()
" 2>&1

docker cp "$CONTAINER:/tmp/db-backup.db" "$BACKUP_DIR/gwoe-antraege-$TS.db"
docker exec "$CONTAINER" rm /tmp/db-backup.db
gzip -9 "$BACKUP_DIR/gwoe-antraege-$TS.db"

# Rotation: 30 Tage, plus Monatsanker (Tag 01) langfristig
find "$BACKUP_DIR" -name "gwoe-antraege-*.db.gz" -mtime +30 \
  ! -name "gwoe-antraege-*01-*.db.gz" -delete 2>/dev/null || true

echo "$(date -Iseconds) backup ok: $BACKUP_DIR/gwoe-antraege-$TS.db.gz"