#!/usr/bin/env bash
# Free stale listeners on dedicated Playwright/E2E ports before harness bind.
# Never touches live dev stack ports 3100 (API) or 5173 (web).
# The ports follow API_PORT, WEB_PORT and WWW_PORT so that runners sharing one host,
# each with its own port set, never kill another job's servers.

set -euo pipefail

for setting in API_PORT WEB_PORT WWW_PORT; do
  value="${!setting:-}"
  if [[ -n "$value" && ! "$value" =~ ^[0-9]+$ ]]; then
    echo "free-e2e-ports: $setting must be a port number, got: $value" >&2
    exit 1
  fi
done

readonly LIVE_PORTS=(3100 5173)
api_port="${API_PORT:-3110}"
readonly E2E_PORTS=("$api_port" "$((api_port + 1))" "${WEB_PORT:-5180}" "${WWW_PORT:-4321}")

if [[ "$(uname -s)" != "Linux" ]]; then
  echo "free-e2e-ports: skip (not Linux)"
  exit 0
fi

if ! command -v fuser >/dev/null 2>&1; then
  echo "free-e2e-ports: warning: fuser not found; cannot pre-free E2E ports" >&2
  exit 0
fi

for port in "${LIVE_PORTS[@]}"; do
  for e2e_port in "${E2E_PORTS[@]}"; do
    if [[ "$port" -eq "$e2e_port" ]]; then
      echo "free-e2e-ports: internal error: live port $port must not be in E2E_PORTS" >&2
      exit 1
    fi
  done
done

echo "free-e2e-ports: clearing stale listeners on E2E ports (${E2E_PORTS[*]}); live ports ${LIVE_PORTS[*]} untouched"

for port in "${E2E_PORTS[@]}"; do
  spec="${port}/tcp"
  if fuser "$spec" >/dev/null 2>&1; then
    echo "free-e2e-ports: port $port in use:"
    fuser -v "$spec" 2>&1 || true
    echo "free-e2e-ports: killing processes on port $port (fuser -k)"
    fuser -k "$spec" 2>&1 || true
    sleep 0.25
    if fuser "$spec" >/dev/null 2>&1; then
      echo "free-e2e-ports: warning: port $port still in use after fuser -k" >&2
    else
      echo "free-e2e-ports: port $port is now free"
    fi
  else
    echo "free-e2e-ports: port $port already free"
  fi
done