#!/usr/bin/env bash
#
# Get latest release version from GitHub
# Usage: x-gh-get-latest-version <repo>
# Author: Ismo Vuorinen <https://github.com/ivuorinen> 2024

set -euo pipefail

# Enable verbosity with VERBOSE=1
VERBOSE="${VERBOSE:-0}"

# Function to print usage information
usage()
{
  echo "Usage: $0 <repo> (e.g. ivuorinen/dotfiles)"
  exit 1
}

# Function to print messages if VERBOSE is enabled
# $1 - message (string)
msg()
{
  [[ "$VERBOSE" -eq 1 ]] && echo "$1"
  return 0
}

# Function to fetch the latest release version from GitHub
# $1 - GitHub repository (string)
get_latest_release()
{
  local repo=$1

  local version
  version=$(curl -s "https://api.github.com/repos/${repo}/releases/latest" \
    | grep "tag_name" \
    | awk -F '"' '{print $4}')

  if [ -z "$version" ]; then
    msg "Failed to fetch the latest release version for repository: $repo"
    echo ""
    exit 1
  fi

  echo "$version"
  return 0
}

# Main function
main()
{
  if [ "$#" -ne 1 ]; then
    usage
  fi

  local repo=$1

  msg "Fetching the latest release version for repository: $repo"

  local version
  version=$(get_latest_release "$repo")

  echo "$version"
  return 0
}

main "$@"

# vim: set ts=2 sw=2 ft=sh et: