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

cd -- "$(dirname -- "${BASH_SOURCE[0]}")"
PORT=7777

echo
echo "================================================================================"
echo " Commonwealth Online - Port ${PORT} in Use"
echo "================================================================================"
echo "1. Kill the process using TCP ${PORT} and restart"
echo "2. Start the server on a different port"
echo "3. Cancel"
read -r -p "Select option (1-3): " choice

find_pids_on_port() {
    local port="$1" pids=""
    if command -v lsof >/dev/null 2>&1; then pids=$(lsof -tiTCP:"${port}" -sTCP:LISTEN 2>/dev/null || true); fi
    if [[ -z "${pids}" ]] && command -v fuser >/dev/null 2>&1; then pids=$(fuser "${port}/tcp" 2>/dev/null | tr -s '[:space:]' '\n' | grep -E '^[0-9]+$' || true); fi
    if [[ -z "${pids}" ]] && command -v ss >/dev/null 2>&1; then pids=$(ss -lptn "sport = :${port}" 2>/dev/null | sed -n 's/.*pid=\([0-9]\+\).*/\1/p' | sort -u || true); fi
    printf '%s\n' "${pids}"
}

case "${choice}" in
    1)
        pids=$(find_pids_on_port "${PORT}")
        [[ -n "${pids}" ]] || { echo "Could not determine the process using TCP ${PORT}." >&2; exit 1; }
        echo "Stopping process(es): ${pids}"
        # shellcheck disable=SC2086
        kill -9 ${pids} 2>/dev/null || { echo "Could not kill the process. Try with sufficient permissions." >&2; exit 1; }
        sleep 2
        exec bash ./start.sh
        ;;
    2)
        read -r -p "Enter desired port (1024-65535): " new_port
        [[ "${new_port}" =~ ^[0-9]+$ ]] || { echo "Port must be numeric." >&2; exit 1; }
        (( new_port >= 1024 && new_port <= 65535 )) || { echo "Port must be 1024-65535." >&2; exit 1; }
        echo "Starting on TCP/UDP ${new_port}. This command-line override does not rewrite commonwealth-server.json."
        exec bash ./start.sh --port "${new_port}"
        ;;
    3) exit 0 ;;
    *) echo "Invalid option." >&2; exit 1 ;;
esac