#!/usr/bin/env bash

# This script is licensed under the Blue Oak Model License 1.0.0.
# See: https://blueoakcouncil.org/license/1.0.0

# Changelog:
# 3.0 (10oct2025) - Added CLIENT_NAME variable; removed finger dependency check
# 2.3 (27may2025) - Minor help section updates, shebang
# 2.2 (07may2025) - Added finger dependency check
# 2.1 (03may2025) - Fixed client name; added nfoview check
# 2.0 (02may2025) - Added piping support; better error handling
# 1.0 (01may2025) - Initial release

# ---------------------------------------------------------------------------

CLIENT_NAME="finger"

if ! command -v nfoview > /dev/null; then
  echo "Error: nfoview is not installed. Please install it first."
  exit 1
fi

if [ -z "$1" ]; then
  echo ""
  echo "nview - view finger output in NFO Viewer with optional piping"
  echo ""
  echo "Usage: $0 user@domain.com [\"piping_command\"]"
  echo ""
  echo "Examples:"
  echo ""
  echo "  $0 @happynetbox.com"
  echo "  $0 user@happynetbox.com"
  echo "  $0 @plan.cat \"| head -n 20\""
  echo "  $0 @plan.cat \"| grep -E 'Sun|Fri|Tue'\""
  echo ""
  echo "Install:   chmod +x nview && sudo cp nview /usr/local/bin"
  echo "Uninstall: sudo rm /usr/local/bin/nview"
  echo ""
  echo "Uses:     Your favorite finger client via 'CLIENT_NAME' variable"
  echo "Requires: nfoview (https://otsaloma.io/nfoview/)"
  echo "Note:     Second argument is a shell pipeline (in quotes)"
  echo "Note:     Output saved to a temp .nfo file (auto-deleted)"
  echo ""
  echo "$(tput bold)Visit:    https://640kb.neocities.org/fingerverse for more clients$(tput sgr0)"
  echo ""
  exit 1
fi

TARGET="$1"
PIPING_CMD="${2:-}"

tmpfile=$(mktemp /tmp/${CLIENT_NAME}_output.XXXXXX.nfo)
trap 'rm -f "$tmpfile"' EXIT 

if [ -z "$PIPING_CMD" ]; then
  $CLIENT_NAME "$TARGET" > "$tmpfile"
else
  eval "$CLIENT_NAME '$TARGET' $PIPING_CMD" > "$tmpfile"
fi

if [ ! -s "$tmpfile" ]; then
  echo "Error: No output generated (invalid target or filter?)"
  exit 1
fi

nfoview "$tmpfile"