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

# =============================================================================
# Outline Wiki Backup Script
# Backs up PostgreSQL database and file storage from Docker containers.
#
# Usage:
#   ./outline-backup.sh [backup_dir]
#
# Crontab (daily at 3 AM):
#   0 3 * * * /path/to/outline-backup.sh /backups/outline >> /var/log/outline-backup.log 2>&1
# =============================================================================

BACKUP_DIR="${1:-/backups/outline}"
DATE=$(date +%Y-%m-%d_%H%M)
RETENTION_DAYS=14

# DokPloy names containers ${COMPOSE_PROJECT}-${SERVICE}-1. APP_NAME is set
# to the compose project name in the .env file, so derive the container
# names from that. Allow overrides via env vars for portability.
PROJECT="${APP_NAME:-outline}"
POSTGRES_CONTAINER="${POSTGRES_CONTAINER:-${PROJECT}-postgres-1}"
OUTLINE_CONTAINER="${OUTLINE_CONTAINER:-${PROJECT}-outline-1}"

mkdir -p "$BACKUP_DIR"

echo "=== Outline Backup — $DATE ==="

# PostgreSQL dump
echo "Backing up PostgreSQL from $POSTGRES_CONTAINER..."
docker exec "$POSTGRES_CONTAINER" pg_dump -U outline -Fc outline \
  > "$BACKUP_DIR/outline-db-$DATE.dump"
echo "  Database: outline-db-$DATE.dump"

# File storage backup
echo "Backing up file storage from $OUTLINE_CONTAINER..."
docker cp "$OUTLINE_CONTAINER:/var/lib/outline/data" - \
  | gzip > "$BACKUP_DIR/outline-files-$DATE.tar.gz"
echo "  Files: outline-files-$DATE.tar.gz"

# Prune old backups
echo "Pruning backups older than $RETENTION_DAYS days..."
find "$BACKUP_DIR" -type f -mtime +$RETENTION_DAYS -delete

echo "=== Backup complete ==="