export function registerServiceWorker() {
  if (typeof window === "undefined" || !("serviceWorker" in navigator)) {
    // Service Worker 不被支持，静默跳过
    return
  }

  // 只在 HTTPS 或 localhost 环境下注册 Service Worker
  const isSecureContext = window.location.protocol === "https:" || 
                          window.location.hostname === "localhost" ||
                          window.location.hostname === "127.0.0.1"
  
  if (!isSecureContext) {
    // 非安全环境，静默跳过 Service Worker 注册
    return
  }

  const register = () => {
    navigator.serviceWorker
      .register("/sw.js")
      .then((registration) => {
        // 检查更新
        registration.addEventListener("updatefound", () => {
          const newWorker = registration.installing
          if (newWorker) {
            newWorker.addEventListener("statechange", () => {
              if (newWorker.state === "installed" && navigator.serviceWorker.controller) {
                // 新的 Service Worker 已安装
              }
            })
          }
        })
      })
      .catch((error) => {
        console.error("Service Worker 注册失败:", error)
      })
  }

  // 如果页面已经加载完成，直接注册；否则等待 load 事件
  if (document.readyState === "complete") {
    register()
  } else {
    window.addEventListener("load", register)
  }
}

export function unregisterServiceWorker() {
  if (typeof window === "undefined" || !("serviceWorker" in navigator)) {
    return
  }

  navigator.serviceWorker.ready
    .then((registration) => {
      registration.unregister()
    })
    .catch((error) => {
      console.error("Service Worker 注销失败:", error)
    })
}