#!/bin/bash
#
#
#   Make sure to set username to your own.
#   You will need to change it in (3) places.
#
#       [USERNAME]
#
#
# Location of the log file
LOGFILE="/home/[USERNAME]/scripts/backups/docker_backups_logs/docker_backups.log"

# Location of backup files. This can be a mapped NAS location if needed.
BACKUPLOCATION="/home/[USERNAME]/server_backups/docker_zips/"

# Generate a timestamp
timestamp=$(date +"%Y-%m-%d")

# Capture the start time
start_time=$(date +%s)

# Log the start of the backup
echo "[$(date +"%Y-%m-%d %H:%M:%S")] Starting backup" | tee -a "$LOGFILE"



# Step 0: Delete backups older than two weeks
echo "[$(date +"%Y-%m-%d %H:%M:%S")] Deleting backups older than two weeks..." | tee -a "$LOGFILE"
sudo find "$BACKUPLOCATION" -name "docker_backups_*.tar.gz" -mtime +14 -exec rm {} \; 2>&1 | tee -a "$LOGFILE"

# Capture the list of running Docker containers
running_containers=$(sudo docker ps --format "{{.Names}}")



# Check if there are any running containers
echo " " | tee -a "$LOGFILE"
echo " " | tee -a "$LOGFILE"

if [ -z "$running_containers" ]; then
  echo "[$(date +"%Y-%m-%d %H:%M:%S")] No Docker containers are running." | tee -a "$LOGFILE"
else
  echo "[$(date +"%Y-%m-%d %H:%M:%S")] Currently running Docker containers:" | tee -a "$LOGFILE"
  echo "$running_containers" | tee -a "$LOGFILE"

  # Step 1: Stop all running Docker containers
  echo " " | tee -a "$LOGFILE"
  echo " " | tee -a "$LOGFILE"
  echo "[$(date +"%Y-%m-%d %H:%M:%S")] Stopping all running Docker containers..." | tee -a "$LOGFILE"
  sudo docker stop $running_containers 2>&1 | tee -a "$LOGFILE"
fi



# Step 2: Create a tarball (zip) of your custom Docker folder with a timestamp
echo " " | tee -a "$LOGFILE"
echo " " | tee -a "$LOGFILE"
echo "[$(date +"%Y-%m-%d %H:%M:%S")] Creating tarball backup of custom Docker directory..." | tee -a "$LOGFILE"

# Create backup in backup location defined above
sudo tar czvf "${BACKUPLOCATION}docker_backups_${timestamp}.tar.gz" /home/[USERNAME]/docker 2>&1 | tee -a "$LOGFILE"



# Step 3: Restart all previously running Docker containers if any were running
if [ -n "$running_containers" ]; then
  echo " " | tee -a "$LOGFILE"
  echo " " | tee -a "$LOGFILE"
  echo "[$(date +"%Y-%m-%d %H:%M:%S")] Restarting all previously running Docker containers..." | tee -a "$LOGFILE"
  sudo docker start $running_containers 2>&1 | tee -a "$LOGFILE"
fi

# Capture the end time
end_time=$(date +%s)

# Calculate the duration in minutes and remaining seconds
duration=$((end_time - start_time))
minutes=$((duration / 60))
seconds=$((duration % 60))

# Log and display the duration
echo " " | tee -a "$LOGFILE"
echo " " | tee -a "$LOGFILE"
echo "[$(date +"%Y-%m-%d %H:%M:%S")] Backup process completed in ${minutes} minutes, ${seconds} seconds." | tee -a "$LOGFILE"