<template>
  <div class="courses-container">
    <!-- 背景动画 -->
    <div class="background-animation">
      <div class="floating-shapes">
        <div class="shape shape-1"></div>
        <div class="shape shape-2"></div>
        <div class="shape shape-3"></div>
      </div>
    </div>

    <div class="main-content">
      <!-- 页面标题 -->
      <div class="page-header">
        <h1 class="page-title">我的课程</h1>
        <p class="page-subtitle">探索知识的海洋，开启学习之旅</p>
      </div>

      <!-- 课程筛选 -->
      <div class="course-filters">
        <div class="filter-tabs">
          <button 
            v-for="category in categories" 
            :key="category.id"
            :class="['filter-tab', { active: activeCategory === category.id }]"
            @click="activeCategory = category.id"
          >
            {{ category.name }}
          </button>
        </div>
        <div class="search-box">
          <input 
            type="text" 
            placeholder="搜索课程..."
            v-model="searchQuery"
            class="search-input"
          >
          <i class="search-icon">🔍</i>
        </div>
      </div>

      <!-- 课程网格 -->
      <div class="courses-grid">
        <div 
          v-for="course in filteredCourses" 
          :key="course.id"
          class="course-card"
          @click="goToCourse(course.id)"
        >
          <div class="course-image">
            <img :src="course.image" :alt="course.title">
            <div class="course-badge">{{ course.level }}</div>
          </div>
          <div class="course-content">
            <h3 class="course-title">{{ course.title }}</h3>
            <p class="course-description">{{ course.description }}</p>
            <div class="course-meta">
              <span class="course-duration">⏱️ {{ course.duration }}</span>
              <span class="course-lessons">📚 {{ course.lessons }}课时</span>
            </div>
            <div class="course-progress">
              <div class="progress-bar">
                <div 
                  class="progress-fill" 
                  :style="{ width: course.progress + '%' }"
                ></div>
              </div>
              <span class="progress-text">{{ course.progress }}%</span>
            </div>
            <div class="course-actions">
              <button class="continue-btn">继续学习</button>
              <button class="details-btn">查看详情</button>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup lang="ts">
import { ref, computed, onMounted } from 'vue'
import { useRouter } from 'vue-router'

const router = useRouter()

const activeCategory = ref('all')
const searchQuery = ref('')

const categories = ref([
  { id: 'all', name: '全部课程' },
  { id: 'math', name: '数学' },
  { id: 'chinese', name: '语文' },
  { id: 'english', name: '英语' },
  { id: 'science', name: '科学' },
  { id: 'programming', name: '编程' }
])

const courses = ref([
  {
    id: 1,
    title: '高等数学基础',
    description: '从基础概念到高级应用，全面掌握高等数学知识',
    image: 'https://images.unsplash.com/photo-1635070041078-e363dbe005cb?w=400',
    category: 'math',
    level: '初级',
    duration: '12周',
    lessons: 48,
    progress: 65
  },
  {
    id: 2,
    title: '现代文学赏析',
    description: '深入理解现代文学作品，提升文学素养和鉴赏能力',
    image: 'https://images.unsplash.com/photo-1481627834876-b7833e8f5570?w=400',
    category: 'chinese',
    level: '中级',
    duration: '10周',
    lessons: 30,
    progress: 40
  },
  {
    id: 3,
    title: '英语口语进阶',
    description: '提升英语口语表达能力，掌握地道的英语交流技巧',
    image: 'https://images.unsplash.com/photo-1434030216411-0b793f4b4173?w=400',
    category: 'english',
    level: '高级',
    duration: '8周',
    lessons: 24,
    progress: 80
  },
  {
    id: 4,
    title: 'Python编程入门',
    description: '零基础学习Python编程，掌握编程思维和实践技能',
    image: 'https://images.unsplash.com/photo-1526379095098-d400fd0bf935?w=400',
    category: 'programming',
    level: '初级',
    duration: '16周',
    lessons: 60,
    progress: 25
  },
  {
    id: 5,
    title: '物理实验探索',
    description: '通过实验探索物理世界的奥秘，培养科学思维',
    image: 'https://images.unsplash.com/photo-1532094349884-543bc11b234d?w=400',
    category: 'science',
    level: '中级',
    duration: '14周',
    lessons: 42,
    progress: 55
  },
  {
    id: 6,
    title: '化学基础理论',
    description: '掌握化学基本原理，理解物质变化的本质',
    image: 'https://images.unsplash.com/photo-1554475901-4538ddfbccc2?w=400',
    category: 'science',
    level: '初级',
    duration: '12周',
    lessons: 36,
    progress: 90
  }
])

const filteredCourses = computed(() => {
  let filtered = courses.value
  
  if (activeCategory.value !== 'all') {
    filtered = filtered.filter(course => course.category === activeCategory.value)
  }
  
  if (searchQuery.value) {
    filtered = filtered.filter(course => 
      course.title.toLowerCase().includes(searchQuery.value.toLowerCase()) ||
      course.description.toLowerCase().includes(searchQuery.value.toLowerCase())
    )
  }
  
  return filtered
})

const goToCourse = (courseId: number) => {
  router.push(`/course/${courseId}`)
}

onMounted(() => {
  // 页面加载动画
  const mainContent = document.querySelector('.main-content')
  if (mainContent) {
    mainContent.classList.add('loaded')
  }
})
</script>

<style scoped>
.courses-container {
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.background-animation {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.floating-shapes {
  position: absolute;
  width: 100%;
  height: 100%;
}

.shape {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  animation: float 6s ease-in-out infinite;
}

.shape-1 {
  width: 80px;
  height: 80px;
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.shape-2 {
  width: 120px;
  height: 120px;
  top: 60%;
  right: 15%;
  animation-delay: 2s;
}

.shape-3 {
  width: 60px;
  height: 60px;
  bottom: 20%;
  left: 20%;
  animation-delay: 4s;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(180deg); }
}

.main-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

.main-content.loaded {
  opacity: 1;
  transform: translateY(0);
}

.page-header {
  text-align: center;
  margin-bottom: 3rem;
}

.page-title {
  font-size: 3rem;
  font-weight: 700;
  color: white;
  margin-bottom: 1rem;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.page-subtitle {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.8);
  margin: 0;
}

.course-filters {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  gap: 2rem;
}

.filter-tabs {
  display: flex;
  gap: 1rem;
}

.filter-tab {
  padding: 0.8rem 1.5rem;
  border: none;
  border-radius: 25px;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.filter-tab:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.filter-tab.active {
  background: rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.search-box {
  position: relative;
}

.search-input {
  padding: 0.8rem 1rem 0.8rem 3rem;
  border: none;
  border-radius: 25px;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  backdrop-filter: blur(10px);
  width: 300px;
  transition: all 0.3s ease;
}

.search-input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.search-input:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(255, 255, 255, 0.6);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
}

.course-card {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  overflow: hidden;
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all 0.3s ease;
  cursor: pointer;
}

.course-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  background: rgba(255, 255, 255, 0.15);
}

.course-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.course-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.course-card:hover .course-image img {
  transform: scale(1.1);
}

.course-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(255, 255, 255, 0.9);
  color: #333;
  padding: 0.3rem 0.8rem;
  border-radius: 15px;
  font-size: 0.8rem;
  font-weight: 600;
}

.course-content {
  padding: 1.5rem;
}

.course-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: white;
  margin-bottom: 0.5rem;
}

.course-description {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 1rem;
}

.course-meta {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.7);
}

.course-progress {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.progress-bar {
  flex: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #4facfe 0%, #00f2fe 100%);
  border-radius: 3px;
  transition: width 0.3s ease;
}

.progress-text {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 600;
}

.course-actions {
  display: flex;
  gap: 1rem;
}

.continue-btn, .details-btn {
  flex: 1;
  padding: 0.8rem;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.continue-btn {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  color: white;
}

.continue-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(79, 172, 254, 0.4);
}

.details-btn {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.details-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .course-filters {
    flex-direction: column;
    gap: 1rem;
  }
  
  .filter-tabs {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .search-input {
    width: 100%;
  }
  
  .courses-grid {
    grid-template-columns: 1fr;
  }
  
  .page-title {
    font-size: 2rem;
  }
}
</style>