#!/usr/bin/env bash

set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

usage() {
  cat << EOF
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value -u url

Script description here.

Available options:

-h, --help      Print this help and exit
-v, --verbose   Print script debug info
-f, --flag      Some flag description
-p, --param     Some param description
-u, --url       URL to download the .list file from
EOF
  exit
}

cleanup() {
  trap - SIGINT SIGTERM ERR EXIT
  # script cleanup here
}

setup_colors() {
  if [[ -t 2 ]] && [[ -z "${NO_COLOR-}" ]] && [[ "${TERM-}" != "dumb" ]]; then
    NOFORMAT='\033[0m' RED='\033[0;31m' GREEN='\033[0;32m' ORANGE='\033[0;33m' BLUE='\033[0;34m' PURPLE='\033[0;35m' CYAN='\033[0;36m' YELLOW='\033[1;33m'
  else
    NOFORMAT='' RED='' GREEN='' ORANGE='' BLUE='' PURPLE='' CYAN='' YELLOW=''
  fi
}

msg() {
  echo >&2 -e "${1-}"
}

die() {
  local msg=$1
  local code=${2-1} # default exit status 1
  msg "$msg"
  exit "$code"
}

install_packages() {
  local packages=("$@")
  if [[ ${#packages[@]} -gt 0 ]]; then
    msg "${BLUE}Installing packages:${NOFORMAT} ${packages[*]}"
    apt update
    apt install -y "${packages[@]}"
  else
    msg "${RED}No packages specified to install.${NOFORMAT}"
  fi
}

download_list() {
  local url=$1
  local temp_file=$(mktemp)

  msg "${BLUE}Downloading .list file from:${NOFORMAT} ${url}"
  curl -s "$url" -o "$temp_file" || die "Failed to download file from $url"

  # Read each line from the file and install the package
  while IFS= read -r line || [[ -n "$line" ]]; do
    # Skip empty lines or comments (lines starting with '#')
    [[ -z "$line" || "$line" =~ ^# ]] && continue
    msg "${GREEN}Installing:${NOFORMAT} $line"
    apt install -y "$line"
  done < "$temp_file"

  # Clean up temporary file
  rm -f "$temp_file"
}

parse_params() {
  # default values of variables set from params
  flag=0
  param=''
  url=''

  while :; do
    case "${1-}" in
    -h | --help) usage ;;
    -v | --verbose) set -x ;;
    --no-color) NO_COLOR=1 ;;
    -f | --flag) flag=1 ;;
    -p | --param)
      param="${2-}"
      shift
      ;;
    -u | --url) # URL to download the .list file
      url="${2-}"
      shift
      ;;
    -?*) die "Unknown option: $1" ;;
    *) break ;;
    esac
    shift
  done

  args=("$@")

  # check required params and arguments
  [[ -z "${param-}" ]] && die "Missing required parameter: param"
  [[ -z "${url-}" ]] && die "Missing required parameter: url"
  [[ ${#args[@]} -eq 0 ]] && die "Missing script arguments"

  return 0
}

parse_params "$@"
setup_colors

# script logic here
msg "${RED}Read parameters:${NOFORMAT}"
msg "- flag: ${flag}"
msg "- param: ${param}"
msg "- arguments: ${args[*]-}"

# Download the .list file and install the packages
download_list "$url"