<template>
  <Teleport to="body">
    <Transition name="modal">
      <div
        v-if="showUpdatePrompt"
        class="fixed inset-0 z-[9999] flex items-center justify-center p-4"
        @click.self="dismissUpdate"
      >
        <div class="absolute inset-0 bg-black/60 backdrop-blur-sm"></div>
        <div
          ref="modalRef"
          class="glass-card p-6 max-w-md w-full relative z-10"
          @click.stop
        >
          <div class="flex items-start justify-between gap-4 mb-4">
            <h3 class="text-xl font-semibold text-white">Update Available</h3>
            <button
              @click="dismissUpdate"
              class="p-2 rounded-lg hover:bg-white/10 text-white/70 hover:text-white transition-colors"
              aria-label="Dismiss"
            >
              <svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
              </svg>
            </button>
          </div>
          <p class="text-white/80 mb-6">
            A new version of Archipelago is available. Update now to get the latest features and fixes.
          </p>
          <div class="flex gap-3 justify-end">
            <button
              @click="dismissUpdate"
              class="px-4 py-2 glass-button rounded-lg text-sm font-medium"
            >
              Later
            </button>
            <button
              @click="handleUpdate"
              class="px-4 py-2 glass-button glass-button-sm rounded-lg text-sm font-medium"
            >
              Update Now
            </button>
          </div>
        </div>
      </div>
    </Transition>
  </Teleport>
</template>

<script setup lang="ts">
import { ref, onMounted } from 'vue'
import { useModalKeyboard } from '@/composables/useModalKeyboard'

const showUpdatePrompt = ref(false)
let updateCallback: (() => Promise<void>) | null = null
const modalRef = ref<HTMLElement | null>(null)

onMounted(() => {
  // Listen for service worker updates
  if ('serviceWorker' in navigator) {
    navigator.serviceWorker.addEventListener('controllerchange', () => {
      // Service worker updated, reload the page
      window.location.reload()
    })

    // Check for updates periodically
    const checkForUpdates = async () => {
      const registration = await navigator.serviceWorker.getRegistration()
      if (registration) {
        await registration.update()
      }
    }

    // Check for updates every 5 minutes
    setInterval(checkForUpdates, 5 * 60 * 1000)

    // Check when user returns to tab (helps with cached PWA)
    document.addEventListener('visibilitychange', () => {
      if (document.visibilityState === 'visible') {
        checkForUpdates()
      }
    })

    // Listen for updatefound event
    navigator.serviceWorker.getRegistration().then((registration) => {
      if (registration) {
        registration.addEventListener('updatefound', () => {
          const newWorker = registration.installing
          if (newWorker) {
            newWorker.addEventListener('statechange', () => {
              if (newWorker.state === 'installed' && navigator.serviceWorker.controller) {
                // New service worker installed, show update prompt
                showUpdatePrompt.value = true
                updateCallback = async () => {
                  if (newWorker.state === 'installed' && registration.waiting) {
                    // Skip waiting and activate the new service worker
                    registration.waiting.postMessage({ type: 'SKIP_WAITING' })
                  }
                }
              }
            })
          }
        })
      }
    })
  }
})

useModalKeyboard(modalRef, showUpdatePrompt, dismissUpdate)

function dismissUpdate() {
  showUpdatePrompt.value = false
}

async function handleUpdate() {
  if (updateCallback) {
    await updateCallback()
  }
}
</script>
