<script setup lang="ts">
import { clamp } from '@vueuse/core'
import type { Attachment } from 'masto'

const {
  attachment,
  fullSize = false,
} = defineProps<{
  attachment: Attachment
  attachments?: Attachment[]
  fullSize?: boolean
}>()

const src = $computed(() => attachment.previewUrl || attachment.url || attachment.remoteUrl!)
const srcset = $computed(() => [
  [attachment.url, attachment.meta?.original?.width],
  [attachment.remoteUrl, attachment.meta?.original?.width],
  [attachment.previewUrl, attachment.meta?.small?.width],
].filter(([url]) => url).map(([url, size]) => `${url} ${size}w`).join(', '))

const rawAspectRatio = computed(() => {
  if (attachment.meta?.original?.aspect)
    return attachment.meta.original.aspect
  if (attachment.meta?.small?.aspect)
    return attachment.meta.small.aspect
  return undefined
})

const aspectRatio = computed(() => {
  if (fullSize)
    return rawAspectRatio.value
  if (rawAspectRatio.value)
    return clamp(rawAspectRatio.value, 0.8, 2.5)
  return undefined
})

const objectPosition = computed(() => {
  return [attachment.meta?.focus?.x, attachment.meta?.focus?.y]
    .map(v => v ? `${v * 100}%` : '50%')
    .join(' ')
})

const typeExtsMap = {
  video: ['mp4', 'webm', 'mov', 'avi', 'mkv', 'flv', 'wmv', 'mpg', 'mpeg'],
  audio: ['mp3', 'wav', 'ogg', 'flac', 'aac', 'm4a', 'wma'],
  image: ['jpg', 'jpeg', 'png', 'svg', 'webp', 'bmp'],
  gifv: ['gifv', 'gif'],
}

const type = $computed(() => {
  if (attachment.type && attachment.type !== 'unknown')
    return attachment.type
  // some server returns unknown type, we need to guess it based on file extension
  for (const [type, exts] of Object.entries(typeExtsMap)) {
    if (exts.some(ext => src?.toLowerCase().endsWith(`.${ext}`)))
      return type
  }
  return 'unknown'
})

const video = ref<HTMLVideoElement | undefined>()
const prefersReducedMotion = usePreferredReducedMotion()

useIntersectionObserver(video, (entries) => {
  if (prefersReducedMotion.value === 'reduce')
    return

  entries.forEach((entry) => {
    if (entry.intersectionRatio <= 0.75)
      !video.value!.paused && video.value!.pause()
    else
      video.value!.play()
  })
}, { threshold: 0.75 })
</script>

<template>
  <div relative ma flex>
    <template v-if="type === 'video'">
      <video
        ref="video"
        preload="none"
        :poster="attachment.previewUrl"
        muted
        loop
        playsinline
        controls
        border="~ base"
        object-cover
        :width="attachment.meta?.original?.width"
        :height="attachment.meta?.original?.height"
        :style="{
          aspectRatio,
          objectPosition,
        }"
      >
        <source :src="attachment.url || attachment.previewUrl" type="video/mp4">
      </video>
    </template>
    <template v-else-if="type === 'gifv'">
      <video
        ref="video"
        preload="none"
        :poster="attachment.previewUrl"
        muted
        loop
        playsinline
        border="~ base"
        object-cover
        :width="attachment.meta?.original?.width"
        :height="attachment.meta?.original?.height"
        :style="{
          aspectRatio,
          objectPosition,
        }"
      >
        <source :src="attachment.url || attachment.previewUrl" type="video/mp4">
      </video>
    </template>
    <template v-else-if="type === 'audio'">
      <audio controls border="~ base">
        <source :src="attachment.url || attachment.previewUrl" type="audio/mp3">
      </audio>
    </template>
    <template v-else>
      <button
        focus:outline-none
        focus:ring="2 primary inset"
        rounded-lg
        h-full
        w-full
        aria-label="Open image preview dialog"
        @click="openMediaPreview(attachments ? attachments : [attachment], attachments?.indexOf(attachment) || 0)"
      >
        <CommonBlurhash
          :blurhash="attachment.blurhash"
          class="status-attachment-image"
          :src="src"
          :srcset="srcset"
          :width="attachment.meta?.original?.width"
          :height="attachment.meta?.original?.height"
          :alt="attachment.description!"
          :style="{
            aspectRatio,
            objectPosition,
          }"
          border="~ base"
          rounded-lg
          h-full
          w-full
          object-cover
        />
      </button>
    </template>
    <div v-if="attachment.description" absolute left-2 class="bottom-2">
      <VDropdown :distance="6" placement="bottom-start">
        <button font-bold text-sm hover:bg-black class="bg-black/65 px1.2 py0.2" rounded-1 text-white>
          <div hidden>
            read image description
          </div>
          ALT
        </button>
        <template #popper>
          <div p4 flex flex-col gap-2 max-w-130>
            <div flex justify-between>
              <h2 font-bold text-xl text-secondary>
                {{ $t('status.img_alt.desc') }}
              </h2>
              <button v-close-popper text-sm btn-outline py0 px2 text-secondary border-base>
                {{ $t('status.img_alt.dismiss') }}
              </button>
            </div>
            <p>
              {{ attachment.description }}
            </p>
          </div>
        </template>
      </VDropdown>
    </div>
  </div>
</template>
