#!/bin/bash

# Check minimum number of arguments
if [ $# -lt 3 ]; then
  echo "ERROR: Not enough arguments. Please provide at least a volume name, backup hash, and version."
  exit 1
fi

volume_name="$1"          # Volume-Name
backup_hash="$2"          # Hashed Machine ID
version="$3"              # version to backup
container="${4:-}"        # optional
mysql_root_password="${5:-}"  # optional
database="${6:-}"         # optional
backup_folder="Backups/$backup_hash/docker-volume-backup/$version/$volume_name"
backup_files="/$backup_folder/files"
backup_sql="/$backup_folder/sql/backup.sql"

echo "Inspect volume $volume_name"
docker volume inspect "$volume_name"
exit_status_volume_inspect=$?

if [ $exit_status_volume_inspect -eq 0 ]; then
    echo "Volume $volume_name already exists"
else
    echo "Create volume $volume_name"
    docker volume create "$volume_name"
    if [ $? -ne 0 ]; then
        echo "ERROR: Failed to create volume $volume_name"
        exit 1
    fi
fi

if [ -f "$backup_sql" ]; then
  if [ -n "$container" ] && [ -n "$mysql_root_password" ] && [ -n "$database" ]; then
    echo "recover mysql dump"
    cat "$backup_sql" | docker exec -i "$container" /usr/bin/mysql -u root --password="$mysql_root_password" "$database"
    if [ $? -ne 0 ]; then
        echo "ERROR: Failed to recover mysql dump"
        exit 1
    fi
    exit 0
  fi
  echo "A database backup exists, but a parameter is missing. Files will be recovered instead."
fi 

if [ -d "$backup_files" ]; then    
  echo "recover files"
  docker run --rm -v "$volume_name:/recover/" -v "$backup_files:/backup/" "kevinveenbirkenbach/alpine-rsync" sh -c "rsync -avv --delete /backup/ /recover/"
  if [ $? -ne 0 ]; then
    echo "ERROR: Failed to recover files"
    exit 1
  fi
  exit 0
else
  echo "ERROR: $backup_files doesn't exist"
  exit 1
fi

echo "ERROR: Unhandled case"
exit 1