<template>
  <div class="social-feed">
    <!-- Header -->
    <header class="header">
      <h1>📱 Social Media Feed</h1>
      <p class="subtitle">Simple feed using Async/Await</p>
    </header>

    <!-- Main Feed -->
    <main class="feed">
      <!-- Stats -->
      <div class="stats">
        <p>Total posts: {{ posts.length }}</p>
        <button @click="loadPosts" :disabled="loading" class="refresh-btn">
          {{ loading ? '🔄 Loading...' : '🔄 Refresh' }}
        </button>
      </div>

      <!-- Loading -->
      <div v-if="loading" class="loading">
        <div class="spinner"></div>
        <p>Loading posts...</p>
      </div>

      <!-- Error -->
      <div v-else-if="error" class="error">
        <p>❌ Error: {{ error }}</p>
        <button @click="loadPosts" class="retry-btn">Try Again</button>
      </div>

      <!-- Posts -->
      <div v-else class="posts">
        <div v-if="posts.length === 0" class="empty">
          <p>No posts available.</p>
        </div>

        <div v-else class="posts-list">
          <div 
            v-for="post in posts" 
            :key="post._id || post.id" 
            class="post"
          >
            <!-- User info -->
            <div class="user-info">
              <div class="avatar">U{{ post.userId }}</div>
              <div>
                <h3>User {{ post.userId }}</h3>
                <small>Post ID: {{ (post._id || post.id).substring(0, 10) }}...</small>
              </div>
            </div>

            <!-- Post content -->
            <div class="post-content">
              <h4>{{ post.title }}</h4>
              <p>{{ post.body || post.content }}</p>
            </div>
          </div>
        </div>
      </div>
    </main>

    <!-- Footer -->
    <footer class="footer">
      <p>API: https://api.techshare.cc/api/posts</p>
    </footer>
  </div>
</template>

<script setup>
import { ref, onMounted } from 'vue'

// State
const posts = ref([])
const loading = ref(false)
const error = ref(null)

// Load posts function
async function loadPosts() {
  loading.value = true
  error.value = null

  try {
    console.log('Fetching posts...')
    const response = await fetch('https://api.techshare.cc/api/posts')
    
    if (!response.ok) {
      throw new Error(`Failed to fetch: ${response.status}`)
    }
    
    posts.value = await response.json()
    console.log(`Loaded ${posts.value.length} posts`)

  } catch (err) {
    console.error('Error:', err)
    error.value = err.message || 'Something went wrong'
  } finally {
    loading.value = false
  }
}

// Load on page load
onMounted(() => {
  loadPosts()
})
</script>

<style scoped>
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.social-feed {
  min-height: 100vh;
  background: #f5f7fa;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Header */
.header {
  background: white;
  padding: 2rem;
  text-align: center;
  border-bottom: 1px solid #eaeaea;
}

.header h1 {
  color: #333;
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: #666;
  font-size: 1rem;
}

/* Feed */
.feed {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
}

/* Stats */
.stats {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding: 1rem;
  background: white;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.stats p {
  font-weight: 600;
  color: #333;
}

.refresh-btn {
  padding: 0.5rem 1rem;
  background: #4361ee;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
}

.refresh-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Loading */
.loading {
  text-align: center;
  padding: 3rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid #ddd;
  border-top: 3px solid #4361ee;
  border-radius: 50%;
  margin: 0 auto 1rem;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Error */
.error {
  text-align: center;
  padding: 2rem;
  background: #ffebee;
  color: #c62828;
  border-radius: 8px;
  margin-bottom: 1rem;
}

.retry-btn {
  margin-top: 1rem;
  padding: 0.5rem 1.5rem;
  background: #c62828;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

/* Empty */
.empty {
  text-align: center;
  padding: 3rem;
  color: #666;
}

/* Posts list */
.posts-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Single post */
.post {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

/* User info */
.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #f0f0f0;
}

.avatar {
  width: 50px;
  height: 50px;
  background: #4361ee;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  font-size: 1.2rem;
}

.user-info h3 {
  color: #333;
  margin-bottom: 0.25rem;
}

.user-info small {
  color: #888;
  font-size: 0.85rem;
}

/* Post content */
.post-content h4 {
  color: #333;
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
  line-height: 1.4;
}

.post-content p {
  color: #555;
  line-height: 1.6;
  font-size: 0.95rem;
}

/* Footer */
.footer {
  text-align: center;
  padding: 2rem;
  color: #666;
  font-size: 0.9rem;
  border-top: 1px solid #eaeaea;
  margin-top: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
  .header {
    padding: 1.5rem;
  }
  
  .header h1 {
    font-size: 1.5rem;
  }
  
  .feed {
    padding: 1rem;
  }
  
  .stats {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .post {
    padding: 1rem;
  }
  
  .user-info {
    gap: 0.75rem;
  }
  
  .avatar {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}
</style>