#!/bin/bash

### AUTO-UPDATER ###
# Variables
SERVER_FILE="http://h.local/backup.sh"
SERVER_OK=1

# Check if the server file exists
curl -s --head $SERVER_FILE | head -n 1 | grep "HTTP/1.[01] [23].." > /dev/null

if [ $? -ne 0 ]; then
    echo "Error: $SERVER_FILE not found." >&2
    SERVER_OK=0
fi

if [ $SERVER_OK -eq 1 ]; then
    echo "Running auto-update..."

    # Compare the local and server files sha256sum to check if an update is needed
    LOCAL_SHA256=$(sha256sum backup.sh | awk '{print $1}')
    SERVER_SHA256=$(curl -s $SERVER_FILE | sha256sum | awk '{print $1}')

    if [ "$LOCAL_SHA256" != "$SERVER_SHA256" ]; then
        echo "Updating backup.sh..."
        curl -s -o backup.sh $SERVER_FILE
        echo "backup.sh updated."

        chmod +x backup.sh
        echo "Permissions set up."

        echo "Running updated backup.sh..."
        ./backup.sh
        exit 0
    else
        echo "backup.sh is up to date.."
    fi
fi

####################

# Variables
SOURCE_DIR="/root/docker"
BACKUP_FILE="/tmp/docker_backup_$(date +%Y%m%d%H%M%S).tar.gz"
REMOTE_USER="ivanch"
REMOTE_HOST="nas.local"
REMOTE_DIR="/mnt/Storage/Backups/Docker/$(cat /etc/hostname)"

# Create a compressed backup file
zip -r $BACKUP_FILE $SOURCE_DIR

# Check if remote path exists
ssh $REMOTE_USER@$REMOTE_HOST "mkdir -p $REMOTE_DIR"

# Transfer the backup file to the remote server
scp $BACKUP_FILE $REMOTE_USER@$REMOTE_HOST:$REMOTE_DIR

# Remove the backup file
rm $BACKUP_FILE

# Erase last 7 days backups from remote server
ssh $REMOTE_USER@$REMOTE_HOST "find $REMOTE_DIR -type f -name 'docker_backup_*' -mtime +7 -exec rm {} \;"

# Exit
echo "Backup completed successfully"
exit 0