<template>
  <div
    class="fixed inset-x-4 bottom-4 z-40 rounded-3xl border border-slate-200/70 bg-white/95 shadow-2xl backdrop-blur dark:border-slate-800/70 dark:bg-slate-900/90 sm:left-auto sm:right-6 sm:w-96">
    <div class="flex items-center justify-between px-5 py-4" @click="toggleExpand">
      <div class="flex items-center gap-2 text-sm font-semibold text-slate-700 dark:text-slate-200">
        <i class="fas fa-download text-brand"></i>
        <span>下载队列</span>
        <span v-if="downloads.length"
          class="rounded-full bg-slate-100 px-2 py-0.5 text-xs font-medium text-slate-500 dark:bg-slate-800/70 dark:text-slate-300">
          ({{ activeDownloads }}/{{ downloads.length }})
        </span>
      </div>
      <div class="flex items-center gap-2">
        <button v-if="downloads.length" type="button"
          class="inline-flex h-9 w-9 items-center justify-center rounded-full border border-slate-200/70 text-slate-500 transition hover:text-slate-900 dark:border-slate-700 dark:text-slate-400"
          title="清除已完成" @click.stop="clearCompleted">
          <i class="fas fa-broom"></i>
        </button>
        <button type="button"
          class="inline-flex h-9 w-9 items-center justify-center rounded-full border border-slate-200/70 text-slate-500 transition hover:text-slate-900 dark:border-slate-700 dark:text-slate-400"
          @click.stop="toggleExpand">
          <i class="fas" :class="isExpanded ? 'fa-chevron-down' : 'fa-chevron-up'"></i>
        </button>
      </div>
    </div>

    <Transition enter-active-class="duration-200 ease-out" enter-from-class="opacity-0 -translate-y-2"
      enter-to-class="opacity-100 translate-y-0" leave-active-class="duration-150 ease-in"
      leave-from-class="opacity-100 translate-y-0" leave-to-class="opacity-0 -translate-y-2">
      <div v-show="isExpanded" class="max-h-96 overflow-y-auto px-3 pb-4">
        <div v-if="downloads.length === 0"
          class="flex flex-col items-center justify-center rounded-2xl border border-dashed border-slate-200/80 px-4 py-12 text-slate-500 dark:border-slate-800/80 dark:text-slate-400">
          <i class="fas fa-inbox text-3xl"></i>
          <p class="mt-3 text-sm">暂无下载任务</p>
        </div>
        <div v-else class="space-y-2">
          <div v-for="download in downloads" :key="download.id"
            class="flex cursor-pointer items-center gap-3 rounded-2xl border border-slate-200/70 bg-white/90 p-3 shadow-sm transition hover:border-brand/40 hover:shadow-lg dark:border-slate-800/70 dark:bg-slate-900"
            :class="download.status === 'failed' ? 'border-rose-300/70 dark:border-rose-500/40' : ''"
            @click="showDownloadDetail(download)">
            <div class="h-12 w-12 overflow-hidden rounded-xl bg-slate-100 dark:bg-slate-800">
              <img :src="download.icon" :alt="download.name" class="h-full w-full object-cover" />
            </div>
            <div class="flex-1">
              <p class="truncate text-sm font-semibold text-slate-800 dark:text-slate-100">{{ download.name }}</p>
              <p class="text-xs text-slate-500 dark:text-slate-400">
                <span v-if="download.status === 'downloading'">下载中 {{ download.progress }}%</span>
                <span v-else-if="download.status === 'installing'">安装中...</span>
                <span v-else-if="download.status === 'completed'">已完成</span>
                <span v-else-if="download.status === 'failed'">失败: {{ download.error }}</span>
                <span v-else-if="download.status === 'paused'">已暂停</span>
                <span v-else>等待中...</span>
              </p>
              <div v-if="download.status === 'downloading'"
                class="mt-2 h-1.5 rounded-full bg-slate-100 dark:bg-slate-800">
                <div class="h-full rounded-full bg-brand" :style="{ width: `${download.progress}%` }"></div>
              </div>
            </div>
            <div class="flex items-center gap-2">
              <button v-if="download.status === 'failed'" type="button"
                class="inline-flex h-9 w-9 items-center justify-center rounded-full border border-rose-200/60 text-rose-500 transition hover:bg-rose-50"
                title="重试" @click.stop="retryDownload(download.id)">
                <i class="fas fa-redo"></i>
              </button>
            </div>
          </div>
        </div>
      </div>
    </Transition>
  </div>
</template>

<script setup>
import { ref, computed, defineProps, defineEmits } from 'vue';

const props = defineProps({
  downloads: {
    type: Array,
    default: () => []
  }
});

const emit = defineEmits([
  'pause',
  'resume',
  'cancel',
  'retry',
  'clear-completed',
  'show-detail'
]);

const isExpanded = ref(false);

const activeDownloads = computed(() => {
  return props.downloads.filter(d => 
    d.status === 'downloading' || d.status === 'installing'
  ).length;
});

const toggleExpand = () => {
  isExpanded.value = !isExpanded.value;
};

const pauseDownload = (id) => {
  // emit('pause', id);
};

const resumeDownload = (id) => {
  // emit('resume', id);
};

const cancelDownload = (id) => {
  // emit('cancel', id);
};

const retryDownload = (id) => {
  emit('retry', id);
};

const clearCompleted = () => {
  emit('clear-completed');
};

const showDownloadDetail = (download) => {
  emit('show-detail', download);
};
</script>
