#!/usr/bin/env bash
# service-restart.sh — Graceful service restart for the-door
# Usage: bash service-restart.sh [--force]
#
# Performs ordered restart: stop -> verify stopped -> start -> verify started
# with health check confirmation.

set -euo pipefail

FORCE=0
for arg in "$@"; do
  case "$arg" in
    --force) FORCE=1 ;;
    *) echo "Usage: $0 [--force]"; exit 1 ;;
  esac
done

log() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1"; }

# ── Stop ────────────────────────────────────────────
stop_services() {
  log "Stopping services..."

  if command -v systemctl > /dev/null 2>&1; then
    systemctl stop nginx 2>/dev/null && log "nginx stopped" || true
  elif command -v nginx > /dev/null 2>&1; then
    nginx -s stop 2>/dev/null && log "nginx stopped" || true
  fi

  # Stop gateway if running
  local gw_pid
  gw_pid=$(lsof -ti:8000 2>/dev/null || true)
  if [ -n "$gw_pid" ]; then
    kill "$gw_pid" 2>/dev/null && log "Gateway stopped (PID $gw_pid)" || true
  fi

  sleep 1
  log "All services stopped"
}

# ── Start ───────────────────────────────────────────
start_services() {
  log "Starting services..."

  # Start nginx
  if command -v systemctl > /dev/null 2>&1; then
    systemctl start nginx && log "nginx started" || { log "FAILED to start nginx"; return 1; }
  elif command -v nginx > /dev/null 2>&1; then
    nginx 2>/dev/null && log "nginx started" || { log "FAILED to start nginx"; return 1; }
  fi

  log "All services started"
}

# ── Verify ──────────────────────────────────────────
verify_services() {
  local host="${1:-localhost}"

  log "Verifying services..."

  # Check nginx
  if pgrep -x nginx > /dev/null 2>&1; then
    log "nginx is running"
  else
    log "ERROR: nginx failed to start"
    return 1
  fi

  # Check static file
  local status
  status=$(curl -s -o /dev/null -w "%{http_code}" --connect-timeout 5 "http://$host/" 2>/dev/null || echo "000")
  if [ "$status" = "200" ]; then
    log "Static content verified (HTTP $status)"
  else
    log "WARNING: Static content check returned HTTP $status"
  fi
}

# ── Main ────────────────────────────────────────────
log "=== Service Restart ==="

if [ "$FORCE" = 1 ]; then
  log "FORCE mode — skipping graceful stop"
else
  stop_services
fi

start_services
verify_services "${HEALTH_HOST:-localhost}"

log "=== Restart complete ==="