#!/usr/bin/env bash
# Development server with auto-restart on config file changes.
#
# Normal code changes (controllers, templates, etc.) are still hot-reloaded
# by Phoenix automatically. This script only handles the cases Phoenix can't:
# config/config.exs, config/dev.exs, and config/runtime.exs.
#
# Usage:
#   chmod +x dev.sh
#   source .env && ./dev.sh

set -euo pipefail

CONFIG_FILES=(
  config/config.exs
  config/dev.exs
  config/runtime.exs
)

cleanup() {
  if [ -n "${SERVER_PID:-}" ] && kill -0 "$SERVER_PID" 2>/dev/null; then
    echo ""
    echo "[dev] Stopping server (pid $SERVER_PID)..."
    kill "$SERVER_PID"
    wait "$SERVER_PID" 2>/dev/null || true
  fi
  exit 0
}

trap cleanup INT TERM

echo "[dev] Watching config files for changes: ${CONFIG_FILES[*]}"
echo "[dev] Normal code changes are still hot-reloaded automatically."
echo "[dev] Press Ctrl+C to stop."
echo ""

while true; do
  echo "[dev] Starting server..."
  mix phx.server &
  SERVER_PID=$!

  # Block until any config file is modified
  inotifywait -q -e modify "${CONFIG_FILES[@]}" 2>/dev/null

  echo ""
  echo "[dev] Config changed — restarting server..."
  kill "$SERVER_PID" 2>/dev/null
  wait "$SERVER_PID" 2>/dev/null || true
  echo ""
done