#!/usr/bin/env bash
set -euo pipefail

script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
repo_root="$(cd "$script_dir/.." && pwd)"

. "$repo_root/scripts/lib.sh"

usage() {
  usage_error "render-release-notes.sh --version X.Y.Z [--repo-root PATH]"
}

main() {
  local version=""

  while (($#)); do
    case "$1" in
      --repo-root)
        [[ $# -ge 2 ]] || usage
        repo_root="$2"
        shift 2
        ;;
      --version)
        [[ $# -ge 2 ]] || usage
        version="$2"
        shift 2
        ;;
      *)
        usage
        ;;
    esac
  done

  [[ -n "$version" ]] || usage

  local changelog_path="$repo_root/CHANGELOG.md"
  [[ -f "$changelog_path" ]] || die "CHANGELOG.md is required at $changelog_path"

  local release_heading
  release_heading="$(grep -E "^## \[$version\] - [0-9]{4}-[0-9]{2}-[0-9]{2}$" "$changelog_path" | head -n1 || true)"
  [[ -n "$release_heading" ]] || die "CHANGELOG.md does not contain a release entry for $version"

  awk -v heading="$release_heading" '
    $0 == heading {
      in_section = 1
      next
    }

    in_section && /^## / {
      exit
    }

    in_section {
      print
    }
  ' "$changelog_path"

  printf '\n## Install\n\n'
  printf '```bash\n'
  printf 'cargo install --version %s runewarp\n' "$version"
  printf 'docker pull runewarp/runewarp:%s\n' "$version"
  printf '```\n'
}

main "$@"