#!/bin/bash
# backup.sh — ежедневный бэкап: pg_dump + файлы → локально + Яндекс.Диск
set -euo pipefail

BACKUP_DIR="/backups/$(date +%Y-%m-%d)"
RETENTION_DAYS="${BACKUP_RETENTION_DAYS:-7}"
DB_NAMES="${DB_NAMES:-mydb}"
TIMESTAMP=$(date +%H%M%S)

mkdir -p "$BACKUP_DIR/db" "$BACKUP_DIR/files"

echo "=== Backup $TIMESTAMP ==="

# 1. Дампы всех БД
IFS=',' read -ra databases <<< "$DB_NAMES"
for db in "${databases[@]}"; do
  db=$(echo "$db" | xargs)  # trim
  echo "→ Dumping database: $db"
  PGPASSWORD="$DB_PASSWORD" pg_dump -h "$DB_HOST" -p "${DB_PORT:-5432}" \
    -U "$DB_USER" -d "$db" --format=custom \
    -f "$BACKUP_DIR/db/${db}-${TIMESTAMP}.dump"
done

# 2. Архив файлов
echo "→ Archiving files..."
tar -czf "$BACKUP_DIR/files/certbot-${TIMESTAMP}.tar.gz" -C /data/certbot . 2>/dev/null || true
tar -czf "$BACKUP_DIR/files/uploads-${TIMESTAMP}.tar.gz" -C /data/uploads . 2>/dev/null || true
tar -czf "$BACKUP_DIR/files/analytics-${TIMESTAMP}.tar.gz" -C /data/analytics . 2>/dev/null || true

# 3. Создаём symlink latest
rm -f /backups/latest
ln -sf "$BACKUP_DIR" /backups/latest

# 4. Ротация — удаляем старше RETENTION_DAYS
find /backups -maxdepth 1 -type d -name '2*' -mtime "+$RETENTION_DAYS" -exec rm -rf {} \; 2>/dev/null || true

echo "✓ Local backup saved to $BACKUP_DIR"

# 5. Синхронизация с Яндекс.Диск
if command -v rclone > /dev/null 2>&1 && [ -n "${RCLONE_REMOTE:-}" ]; then
  echo "→ Syncing to cloud: $RCLONE_REMOTE"
  rclone sync /backups "$RCLONE_REMOTE" --progress 2>&1 || \
    echo "  ⚠ Cloud sync failed (check rclone config)"
  echo "✓ Cloud sync complete"
fi

echo "=== Backup finished ==="