_lib.sh

#!/bin/bash

# -------------------------------------------------------------------------
# prompt_for_input
#
# Description:
# This function prompts the user for input and can enforce required input.
#
# Parameters:
#   var_name       - The name of the variable to store the user's input.
#   prompt_message - The message to display when prompting the user for input.
#   required       - A boolean value ('true' or 'false') indicating whether input is mandatory.
#
# Behavior:
#   - Displays the prompt_message to the user.
#   - If the user provides input, the function sets the variable var_name to this input.
#   - If the user provides no input and required is 'true', the function will repeatedly
#     prompt the user until valid input is provided.
#   - If required is 'false', the function will set the variable var_name to the input,
#     which could be empty.
#
# Example Usage:
#   prompt_for_input MY_VAR "Enter your name" true
#   echo "You entered: $MY_VAR"
#
#   prompt_for_input MY_VAR "Enter your name (optional)" false
#   echo "You entered: $MY_VAR"
#
# -------------------------------------------------------------------------

_prompt_for_input_() {
  local var_name=$1
  local prompt_message=$2
  local required=$3

  while true; do
    read -p "$prompt_message: " input
    if [[ -z "$input" ]]; then
      if [[ "$required" == "true" ]]; then
        echo -e "${C_RED}Input required, please try again...${C_DEFAULT}"
      else
        export $var_name=""
        break
      fi
    else
      export $var_name="$input"
      break
    fi
  done
}

_print_array_() {
  local counter=1
  for item in "$@"; do
    echo "${counter}. ${item}"
    ((counter++))
  done
}

# -------------------------------------------------------------------------
# bytes_to_mb
#
# Description:
# Converts bytes to megabytes with 1 decimal place precision.
#
# Parameters:
#   bytes - The number of bytes to convert
#
# Returns:
#   The converted value in MB with 1 decimal place
#
# Example Usage:
#   mb_value=$(bytes_to_mb 1048576)
#   echo "$mb_value"  # Output: 1.0
#
# -------------------------------------------------------------------------
function bytes_to_mb() {
  local bytes=$1
  local result=$(echo "scale=2; $bytes / 1024 / 1024" | bc -l 2>/dev/null || echo "0")
  # Add leading zero if result starts with decimal point
  if [[ "$result" =~ ^\. ]]; then
    echo "0$result"
  else
    echo "$result"
  fi
}

# Set cron job
# Takes schedule and command as parameters
# Wraps command with sudo and ubuntu user
# Adds cron job to crontab
function _set_cron_() {
  local schedule="$1"
  local cmd="$2"
  local wrapped_cmd="sudo -H -u ubuntu bash -c '$cmd'"
  local cron_entry="${schedule} ${wrapped_cmd}"

  if crontab -l 2>/dev/null | grep -qF "$cron_entry"; then
    echo -e "${C_BLUE}Cron job already exists: $cron_entry${C_DEFAULT}"
  else
    (crontab -l 2>/dev/null; echo "$cron_entry") | crontab -
    echo -e "${C_GREEN}Cron job added: $cron_entry${C_DEFAULT}"
  fi
}

# Define color codes for easy reference
C_RED="\033[0;31m"
C_GREEN="\033[0;32m"
C_YELLOW="\033[0;33m"
C_DEFAULT="\033[0m"
C_BLUE="\033[0;34m"
C_PURPLE="\033[0;35m"