<template>
  <div class="embla">
    <div class="embla__viewport" ref="emblaNode">
      <div class="embla__container">
        <div class="embla__slide" v-for="(slide, index) in slides" :key="index">
          <img :src="slide" alt="" />
        </div>
      </div>
    </div>

    <!-- 左右箭头 -->
    <button class="embla__button prev" @click="scrollPrev" :disabled="!canScrollPrev">‹</button>
    <button class="embla__button next" @click="scrollNext" :disabled="!canScrollNext">›</button>

    <!-- 圆点导航 -->
    <div class="embla__dots">
      <button
        v-for="(_, index) in slides"
        :key="index"
        :class="{ 'is-selected': state.selectedIndex == index }"
        @click="scrollTo(index)"
      >
        {{}}
      </button>
    </div>
  </div>
</template>

<script setup>
import { onMounted, ref, reactive } from 'vue'
import EmblaCarousel from 'embla-carousel'

const emblaNode = ref(null)
const embla = ref(null)

const state = reactive({
  selectedIndex: 0,
  canScrollPrev: false,
  canScrollNext: false,
})

const slides = ['/images/banner/bk1000.png', '/images/banner/bk2000.png']

const updateButtons = () => {
  if (!embla.value) return
  state.canScrollPrev = embla.value.canScrollPrev()
  state.canScrollNext = embla.value.canScrollNext()
  state.selectedIndex = embla.value.selectedScrollSnap()
}

const scrollPrev = () => embla.value?.scrollPrev()
const scrollNext = () => embla.value?.scrollNext()
const scrollTo = index => embla.value?.scrollTo(index)

onMounted(() => {
  embla.value = EmblaCarousel(emblaNode.value, { loop: true })

  const updateOnSelect = () => {
    state.selectedIndex = embla.value.selectedScrollSnap()
    state.canScrollPrev = embla.value.canScrollPrev()
    state.canScrollNext = embla.value.canScrollNext()
  }

  embla.value.on('select', updateOnSelect)
})
</script>

<style scoped>
.embla {
  position: relative;
}
.embla__viewport {
  overflow: hidden;
}
.embla__container {
  display: flex;
}
.embla__slide {
  flex: 0 0 100%;
  padding: 10px;
}
.embla__button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: #00000088;
  color: white;
  border: none;
  padding: 10px;
  cursor: pointer;
  z-index: 1;
}
.embla__button.prev {
  left: 10px;
}
.embla__button.next {
  right: 10px;
}
.embla__dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 10px;
}
.embla__dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: #ccc;
  cursor: pointer;
}
.embla__dots .is-selected {
  background: #333;
}
</style>
