#!/bin/bash
# env setup script for nginx-proxy-manager docker compose
# 2023-01-06 by dede & dany

dirname=$(basename $(dirname "${BASH_SOURCE[0]}"))
echo "$dirname docker compose setup"
echo "> env setup for $dirname with docker compose"

# check for existing .env file to not break an existing setup
if [[ -f .env ]]; then
  if [[ "$1" == "-f" ]]; then
    echo ".env file already exists. force param is set. .env will be overwritten."
  else
    echo ".env file already exists. setup will not run."\
      "either rename/delete it first or run this script with force param like this: "
    echo "$ ./${0##*/} -f"
    exit 1
  fi
elif [[ ! -f env.sample ]]; then
  echo "> env.sample file is missing. cannot run."
  exit 2
fi

# create .env file
echo -e "# file generated by ${0##*/} on $(date +"%F %H:%M") by $USER\n" > .env

# step through the list of lines and ask for each key to use default value or set value
# for each line in configfile
while read -r -u 3 line; do

  # keep blank and comment lines
  if [[ -z $line ]] || [[ $line == \#* ]]; then
    echo "$line" >> .env

  # handle variable lines
  else
    # split line by '=' into key and value
    readarray -d "=" -t currvar<<< "$line"

    # preset value with default
    value=${currvar[1]::-1}

    # check if there's a password to generate
    if [[ ${currvar[0]} =~ (PASS|PASSWORD|PWD|PASSWD)$ ]]; then
      value=$(openssl rand -base64 29 | tr -d "=+/" | cut -c1-25)
    fi

    # ask for user input
    echo -n "please enter value for ${currvar[0]} [$value]: "
    read -r userinput

    # set userinput as new value if any
    if [ -n "$userinput" ]; then
      value=$userinput
    fi

    # check if there's a directory to create
    if [[ ${currvar[0]} =~ (DIR|DIRECTORY)$ ]]; then
      if [[ ! -d $value ]]; then
        echo -n "do you want to create the directory? [Y/n]: "
        read -r createdir
        if [[ $createdir =~ ^([yY]|)$ ]]; then
          mkdir -p "$value"
          echo "directory created."
        fi
      else
        echo "directory already exists."
        if [ -n "$(ls -A "$value")" ]; then
          echo "WATCH OUT! the directory is NOT empty. please ensure this is intended."
        fi
      fi
    fi

    # now append the line    
    echo "${currvar[0]}=$value" >> .env

  fi
done 3< env.sample