#!/bin/bash

set -euo pipefail

PROJECT_NAME=$(basename "$(pwd)")
echo "📦 Docker Compose project: $PROJECT_NAME"

# Get all named volumes for this project
VOLUMES=$(docker volume ls --format '{{.Name}}' | grep "^${PROJECT_NAME}_")

if [[ -z "$VOLUMES" ]]; then
  echo "❌ No volumes found for project '$PROJECT_NAME'"
  exit 1
fi

for FULL_VOL in $VOLUMES; do
  SHORT_VOL="${FULL_VOL#${PROJECT_NAME}_}"

  VOLUME_PATH="/var/lib/docker/volumes/${FULL_VOL}/_data"
  OUTPUT_FILE="${SHORT_VOL}.tar.gz"

  echo "📁 Found volume: $SHORT_VOL"
  read -rp "→ Backup this volume to ${OUTPUT_FILE}? (Y/n) " REPLY
  REPLY=${REPLY:-Y}

  if [[ "$REPLY" =~ ^[Yy]$ ]]; then
    if [[ ! -d "$VOLUME_PATH" ]]; then
      echo "⚠️  Volume path not found: $VOLUME_PATH"
      continue
    fi

    echo "📦 Backing up $VOLUME_PATH → $OUTPUT_FILE"
    sudo tar -czf "$OUTPUT_FILE" -C "$VOLUME_PATH" .
    echo "✅ Done."
  else
    echo "⏭️  Skipped $SHORT_VOL"
  fi
done