#!/bin/bash
# PostgreSQL Backup Script for DAARION
# Run hourly via cron: 0 * * * * /usr/local/bin/backup.sh

set -e

# Configuration
DB_USER="${DB_USER:-daarion}"
DB_NAME="${DB_NAME:-daarion}"
BACKUP_DIR="${BACKUP_DIR:-/var/backups/daarion}"
RETENTION_DAYS="${RETENTION_DAYS:-7}"

# Create backup directory if it doesn't exist
mkdir -p "$BACKUP_DIR"

# Generate backup filename with timestamp
BACKUP_FILE="$BACKUP_DIR/daarion_$(date +"%Y-%m-%d_%H-%M").dump"

# Perform backup
echo "Starting backup: $BACKUP_FILE"
pg_dump -U "$DB_USER" -Fc "$DB_NAME" > "$BACKUP_FILE"

# Check if backup was successful
if [ $? -eq 0 ]; then
    echo "Backup successful: $BACKUP_FILE"
    
    # Compress backup (optional, pg_dump -Fc already creates compressed format)
    # gzip "$BACKUP_FILE"
    
    # Remove old backups (older than RETENTION_DAYS)
    find "$BACKUP_DIR" -type f -name "daarion_*.dump" -mtime +$RETENTION_DAYS -delete
    echo "Cleaned up backups older than $RETENTION_DAYS days"
    
    # Optional: Upload to cloud storage (Cloudflare R2, S3, etc.)
    # Example for Cloudflare R2:
    # if [ -n "$R2_ACCESS_KEY" ] && [ -n "$R2_SECRET_KEY" ]; then
    #     rclone copy "$BACKUP_FILE" "r2:daarion-backups/" --config /etc/rclone.conf
    # fi
else
    echo "Backup failed!" >&2
    exit 1
fi