feat(ActivityCard): 添加活动状态标签和动态样式

在ActivityCard组件中新增活动状态标签，根据活动时间动态显示不同状态（如“报名中”、“进行中”等），并为其设置相应的背景和文字颜色。同时优化了活动地点的显示逻辑，支持线上活动的显示。

 <!--
  * @Date: 2025-04-17 13:16:20
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-04-17 13:16:22
- * @FilePath: /reading-club-app/src/components/shared/ActivityCard.vue
+ * @LastEditTime: 2025-04-21 10:26:22
+ * @FilePath: /mlaj-reading-club/src/components/shared/ActivityCard.vue
  * @Description: 文件描述
 -->
 <template>
@@ -16,7 +16,7 @@
         :alt="activity.title"
         class="absolute inset-0 h-full w-full object-cover"
       />
-      <div
+      <!-- <div
         v-if="activity.tags && activity.tags.length"
         class="absolute top-0 left-0 p-4 flex flex-wrap gap-2"
       >
@@ -27,6 +27,12 @@
         >
           {{ tag }}
         </span>
+      </div> -->
+      <div class="absolute top-2 left-2">
+        <span class="inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium"
+          :class="statusBadgeClass">
+          {{ statusText }}
+        </span>
       </div>
     </div>
 
@@ -46,7 +52,7 @@
           <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M17.657 16.657L13.414 20.9a1.998 1.998 0 01-2.827 0l-4.244-4.243a8 8 0 1111.314 0z" />
           <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 11a3 3 0 11-6 0 3 3 0 016 0z" />
         </svg>
-        <span>{{ activity.location }}</span>
+        <span>{{activity.activity_type === 'online' ? '线上活动' : (activity.location ? (typeof activity.location === 'object' ? activity.location.name : activity.location) : '地点未设置')}}</span>
       </div>
 
       <div class="flex items-center justify-between">
@@ -67,7 +73,7 @@
 </template>
 
 <script setup>
-import { defineProps } from 'vue'
+import { ref, computed, defineProps } from 'vue'
 
 const props = defineProps({
   activity: {
@@ -78,7 +84,7 @@ const props = defineProps({
 
 // 格式化日期时间
 const formatDateTime = (dateTimeStr) => {
-  const date = new Date(dateTimeStr.replace(' ', 'T'))
+  const date = new Date(dateTimeStr)
   return new Intl.DateTimeFormat('zh-CN', {
     year: 'numeric',
     month: 'long',
@@ -87,4 +93,45 @@ const formatDateTime = (dateTimeStr) => {
     minute: '2-digit'
   }).format(date)
 }
+
+  // Calculate if registration is still open
+  const now = new Date();
+  const registrationStart = new Date(props.activity.registration_start);
+  const registrationEnd = new Date(props.activity.registration_end);
+  const activityStart = new Date(props.activity.start_time);
+
+  const isRegistrationOpen = ref(now >= registrationStart && now <= registrationEnd);
+  const isUpcoming = ref(now < activityStart);
+  const isPast = ref(now > new Date(props.activity.end_time));
+  const isOngoing = ref(!isUpcoming && !isPast);
+
+  // Calculate capacity percentage
+  const capacityPercentage = Math.min((props.activity.participant_count / props.activity.max_participants) * 100, 100);
+
+  // Dynamically set status badge colors
+  const statusBadgeClass = computed(() => {
+  if (isPast.value) {
+    return 'bg-gray-100 text-gray-800';
+  } else if (isOngoing.value) {
+    return 'bg-green-100 text-green-800';
+  } else if (isRegistrationOpen.value) {
+    return 'bg-blue-100 text-blue-800';
+  } else if (isUpcoming.value && !isRegistrationOpen.value) {
+    return 'bg-yellow-100 text-yellow-800';
+  }
+  return '';
+});
+
+const statusText = computed(() => {
+  if (isPast.value) {
+    return '已结束';
+  } else if (isOngoing.value) {
+    return '进行中';
+  } else if (isRegistrationOpen.value) {
+    return '报名中';
+  } else if (isUpcoming.value && !isRegistrationOpen.value) {
+    return '即将开始';
+  }
+  return '';
+});
 </script>