new Notification('系統(tǒng)提醒', {
  body: '您有一條待處理消息',
  icon: 'https://example.com/assets/notify-icon.png',
  badge: 'https://example.com/assets/notify-badge.png',
  tag: 'todo-1001',
  requireInteraction: true,
  data: {
    url: 'https://example.com/app/todo?id=1001'
  }
})

if ('serviceWorker' in navigator) {
  window.addEventListener('load', () => {
    navigator.serviceWorker.register('/notification-sw.js').catch((error: unknown) => {
      console.warn('[NotificationSW] register failed:', error)
    })
  })
}

const notificationOptions: NotificationOptions = {
  body: options.body,
  icon: notificationIcon,
  badge: notificationBadgeIcon,
  requireInteraction: options.requireInteraction ?? false,
  tag: options.tag,
  data: {
    url: options.clickUrl ?? ''
  }
}
await registration.showNotification(options.title, notificationOptions)

self.addEventListener('notificationclick', (event) => {
  event.notification.close()
  const targetUrl = String(event.notification?.data?.url || '').trim()
  if (!targetUrl) return

  event.waitUntil(
    self.clients.matchAll({ type: 'window', includeUncontrolled: true }).then((clients) => {
      for (const client of clients) {
        if (client.url === targetUrl && 'focus' in client) {
          return client.focus()
        }
      }
      return self.clients.openWindow(targetUrl)
    })
  )
})

import { computed, ref, type ComputedRef, type Ref } from 'vue'
import notificationBadgeIcon from '@/assets/images/notify-badge-placeholder.png'
import notificationIcon from '@/assets/images/notify-icon-placeholder.png'

type NotifyPermission = NotificationPermission | 'unsupported'

interface SendBrowserNotificationOptions {
  title: string
  body: string
  clickUrl?: string
  tag?: string
  requireInteraction?: boolean
  autoCloseMs?: number
  onClick?: () => void
}

interface UseBrowserNotification {
  message: Ref<string>
  isSupported: Ref<boolean>
  permissionState: Ref<NotifyPermission>
  supportText: ComputedRef<string>
  permissionLabel: ComputedRef<string>
  requestNotifyPermission: () => Promise<void>
  sendBrowserNotification: (options: SendBrowserNotificationOptions) => void
}

export const useBrowserNotification = (): UseBrowserNotification => {
  const message = ref('等待操作')
  const isSupported = ref<boolean>(typeof window !== 'undefined' && 'Notification' in window)
  const permissionState = ref<NotifyPermission>(isSupported.value ? Notification.permission : 'unsupported')

  const supportText = computed(() => (isSupported.value ? '是' : '否'))
  const permissionLabel = computed(() => {
    if (permissionState.value === 'unsupported') return '瀏覽器不支持'
    if (permissionState.value === 'granted') return '已授權(quán)'
    if (permissionState.value === 'denied') return '已拒絕'
    return '未授權(quán)（default）'
  })

  const updatePermissionState = (): void => {
    permissionState.value = isSupported.value ? Notification.permission : 'unsupported'
  }

  const requestNotifyPermission = async (): Promise<void> => {
    if (!isSupported.value) {
      message.value = '當(dāng)前瀏覽器不支持 Notification API'
      return
    }

    try {
      const result = await Notification.requestPermission()
      permissionState.value = result
      message.value = `權(quán)限申請(qǐng)結(jié)果：${result}`
    } catch (error) {
      message.value = '申請(qǐng)通知權(quán)限失敗，請(qǐng)稍后重試'
      console.error('Notification.requestPermission failed:', error)
    }
  }

  const getServiceWorkerRegistration = async (): Promise<ServiceWorkerRegistration | null> => {
    if (typeof window === 'undefined' || !('serviceWorker' in navigator)) return null
    try {
      return await navigator.serviceWorker.getRegistration()
    } catch {
      return null
    }
  }

  const sendBrowserNotification = (options: SendBrowserNotificationOptions): void => {
    if (!isSupported.value) {
      message.value = '當(dāng)前瀏覽器不支持 Notification API'
      return
    }

    updatePermissionState()
    if (permissionState.value !== 'granted') {
      message.value = '請(qǐng)先授權(quán)通知權(quán)限后再發(fā)送'
      return
    }

    const autoCloseMs = options.autoCloseMs ?? 4000
    ;(async () => {
      const registration = await getServiceWorkerRegistration()
      if (registration) {
        try {
          const notificationOptions: NotificationOptions = {
            body: options.body,
            icon: notificationIcon,
            badge: notificationBadgeIcon,
            requireInteraction: options.requireInteraction ?? false,
            tag: options.tag,
            data: {
              url: options.clickUrl ?? ''
            }
          }
          await registration.showNotification(options.title, notificationOptions)
          message.value = `通知已發(fā)送：${options.title}`
          return
        } catch (error) {
          console.warn('ServiceWorker showNotification failed, fallback to page notification:', error)
        }
      }

      try {
        const notificationOptions: NotificationOptions = {
          body: options.body,
          icon: notificationIcon,
          badge: notificationBadgeIcon,
          requireInteraction: options.requireInteraction ?? false
        }
        // 不傳 tag 時(shí)允許系統(tǒng)通知疊加顯示；傳 tag 時(shí)按 tag 覆蓋同組通知
        if (options.tag) {
          notificationOptions.tag = options.tag
        }

        const notice = new Notification(options.title, notificationOptions)
        const shouldAutoClose = !(options.requireInteraction ?? false)
        const autoCloseTimer = shouldAutoClose
          ? window.setTimeout(() => {
              notice.close()
            }, autoCloseMs)
          : null

        notice.onclick = () => {
          window.focus()
          notice.close()
          if (options.clickUrl) {
            window.open(options.clickUrl, '_blank', 'noopener,noreferrer')
          }
          options.onClick?.()
          message.value = '已點(diǎn)擊通知，窗口已嘗試聚焦'
        }
        notice.onclose = () => {
          if (autoCloseTimer !== null) {
            window.clearTimeout(autoCloseTimer)
          }
        }
        notice.onerror = () => {
          if (autoCloseTimer !== null) {
            window.clearTimeout(autoCloseTimer)
          }
          message.value = '通知發(fā)送失敗，請(qǐng)檢查瀏覽器通知設(shè)置'
        }

        message.value = `通知已發(fā)送：${options.title}`
      } catch (error) {
        message.value = '創(chuàng)建通知失敗，請(qǐng)檢查瀏覽器設(shè)置'
        console.error('Notification constructor failed:', error)
      }
    })().catch((error: unknown) => {
      message.value = '創(chuàng)建通知失敗，請(qǐng)檢查瀏覽器設(shè)置'
      console.error('sendBrowserNotification failed:', error)
    })
  }

  return {
    message,
    isSupported,
    permissionState,
    supportText,
    permissionLabel,
    requestNotifyPermission,
    sendBrowserNotification
  }
}

self.addEventListener('notificationclick', (event) => {
  event.notification.close()
  const targetUrl = String(event.notification?.data?.url || '').trim()
  if (!targetUrl) return

  event.waitUntil(
    self.clients.matchAll({ type: 'window', includeUncontrolled: true }).then((clients) => {
      for (const client of clients) {
        if (client.url === targetUrl && 'focus' in client) {
          return client.focus()
        }
      }
      return self.clients.openWindow(targetUrl)
    }),
  )
})