<template>
  <div class="learning-paths-page">
    <!-- 页面标题区域 -->
    <div class="page-header">
      <div class="container">
        <div class="header-content">
          <h1 class="page-title">学习路径</h1>
          <p class="page-subtitle">成就卓越的学习之路，开启智慧之门</p>
        </div>
        <div class="header-decoration">
          <!-- 装饰图片暂时隐藏 -->
        </div>
      </div>
    </div>

    <!-- 主要内容区域 -->
    <div class="main-content">
      <div class="container">
        <div class="content-layout">
          <!-- 左侧筛选栏 -->
          <div class="filter-sidebar">
            <!-- 所有路径标题 - 无背景样式 -->
            <h3 class="filter-title">所有路径</h3>
            <div class="filter-section">
              <div class="filter-options">
                <div class="filter-option active" :class="{ active: selectedCategory === 'psychology' }" @click="selectCategory('psychology')">
                  <span class="option-icon blue-icon">■</span>
                  <span class="option-text">数据心理学</span>
                </div>
                <div class="filter-option" :class="{ active: selectedCategory === 'ai' }" @click="selectCategory('ai')">
                  <span class="option-icon gray-icon">■</span>
                  <span class="option-text">AI 时代生存指南：从工程师到架构师...</span>
                </div>
                <div class="filter-option" :class="{ active: selectedCategory === 'english1' }" @click="selectCategory('english1')">
                  <span class="option-icon gray-icon">■</span>
                  <span class="option-text">新视野英语训练营</span>
                </div>
                <div class="filter-option" :class="{ active: selectedCategory === 'english2' }" @click="selectCategory('english2')">
                  <span class="option-icon gray-icon">■</span>
                  <span class="option-text">新视野英语训练营</span>
                </div>
                <div class="filter-option" :class="{ active: selectedCategory === 'learning' }" @click="selectCategory('learning')">
                  <span class="option-icon gray-icon">■</span>
                  <span class="option-text">科学学习方法 | 强化记忆</span>
                </div>
                <div class="filter-option" :class="{ active: selectedCategory === 'health' }" @click="selectCategory('health')">
                  <span class="option-icon gray-icon">■</span>
                  <span class="option-text">运动与健康</span>
                </div>
                <div class="filter-option" :class="{ active: selectedCategory === 'education' }" @click="selectCategory('education')">
                  <span class="option-icon gray-icon">■</span>
                  <span class="option-text">数师教育学科技能体系</span>
                </div>
              </div>
            </div>
          </div>

          <!-- 右侧内容区域 -->
          <div class="content-main">
            <!-- 课程标题 - 无背景样式 -->
            <h3 class="content-title">课程</h3>

            <!-- 统计信息和筛选行 -->
            <div class="content-header">
              <div class="result-info">
                <span class="result-stats">共 34 门 | 567 课程 | 1243 小时</span>
              </div>
              <div class="sort-options">
                <span class="sort-label">难度等级</span>
                <select v-model="sortBy" class="sort-select">
                  <option value="default">全部</option>
                  <option value="beginner">初级</option>
                  <option value="intermediate">中级</option>
                  <option value="advanced">高级</option>
                </select>
              </div>
            </div>

            <!-- 学习路径列表 -->
            <div class="paths-list">
              <div class="path-card" v-for="path in paginatedPaths" :key="path.id" @click="goToPath(path.id)">
                <div class="card-image">
                  <div class="image-placeholder"></div>
                  <div class="card-badge">热门</div>
                </div>
                <div class="card-content">
                  <h3 class="card-title">{{ path.title }}</h3>
                  <div class="card-meta">
                    <span class="meta-item">{{ path.level }}</span>
                    <span class="meta-item">{{ path.duration }}</span>
                    <span class="meta-item">免费</span>
                  </div>
                  <p class="card-description">{{ path.description }}</p>
                  <div class="card-footer">
                    <div class="card-stats">
                      <span class="stat-item">{{ path.studentsCount }}人学习</span>
                      <span class="stat-item">{{ path.lessonsCount }}个课程</span>
                    </div>
                    <div class="card-rating">
                      <span class="rating-icon">👍</span>
                      <span class="rating-text">5.0</span>
                    </div>
                  </div>
                </div>
              </div>
            </div>

            <!-- 分页 -->
            <div class="pagination">
              <button class="page-btn" :disabled="currentPage === 1" @click="goToPage(currentPage - 1)">
                上一页
              </button>
              <button 
                class="page-btn" 
                :class="{ active: page === currentPage }" 
                v-for="page in visiblePages" 
                :key="page"
                @click="goToPage(page)"
              >
                {{ page }}
              </button>
              <button class="page-btn" :disabled="currentPage === totalPages" @click="goToPage(currentPage + 1)">
                下一页
              </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()

// 筛选状态
const selectedCategory = ref('psychology')
const sortBy = ref('default')

// 分页状态
const currentPage = ref(1)
const pageSize = 8

// 学习路径数据
const learningPaths = ref([
  {
    id: 1,
    title: '数据心理学的起源',
    description: '本课程深度解析，让您一次性掌握数据分析的心理学基础。适合希望从心理学角度理解数据的学习者。这是一门综合性的课程，涵盖了数据分析的各个方面。通过本课程的学习，您将能够掌握数据分析的核心技能，并能够在实际工作中应用这些技能。',
    image: 'https://images.unsplash.com/photo-1635070041078-e363dbe005cb?ixlib=rb-4.0.3&auto=format&fit=crop&w=400&q=80',
    category: 'psychology',
    level: '数学基础',
    duration: '免费',
    studentsCount: 1234,
    lessonsCount: 24,
    badge: '热门'
  },
  {
    id: 2,
    title: '数据心理学的发展历程',
    description: '本课程深度解析，让您一次性掌握数据分析的心理学基础。适合希望从心理学角度理解数据的学习者。这是一门综合性的课程，涵盖了数据分析的各个方面。通过本课程的学习，您将能够掌握数据分析的核心技能。',
    image: 'https://images.unsplash.com/photo-1509228468518-180dd4864904?ixlib=rb-4.0.3&auto=format&fit=crop&w=400&q=80',
    category: 'psychology',
    level: '数学基础',
    duration: '免费',
    studentsCount: 856,
    lessonsCount: 30,
    badge: '热门'
  },
  {
    id: 3,
    title: '研究情境性环境的影响',
    description: '本课程深度解析，让您一次性掌握数据分析的心理学基础。适合希望从心理学角度理解数据的学习者。这是一门综合性的课程，涵盖了数据分析的各个方面。通过本课程的学习，您将能够掌握数据分析的核心技能。',
    image: 'https://images.unsplash.com/photo-1551288049-bebda4e38f71?ixlib=rb-4.0.3&auto=format&fit=crop&w=400&q=80',
    category: 'psychology',
    level: '数学基础',
    duration: '免费',
    studentsCount: 678,
    lessonsCount: 36,
    badge: '热门'
  },
  {
    id: 4,
    title: '研究学习环境设计和有效教学模式',
    description: '本课程深度解析，让您一次性掌握数据分析的心理学基础。适合希望从心理学角度理解数据的学习者。这是一门综合性的课程，涵盖了数据分析的各个方面。通过本课程的学习，您将能够掌握数据分析的核心技能。',
    image: 'https://images.unsplash.com/photo-1551650975-87deedd944c3?ixlib=rb-4.0.3&auto=format&fit=crop&w=400&q=80',
    category: 'psychology',
    level: '数学基础',
    duration: '免费',
    studentsCount: 945,
    lessonsCount: 30,
    badge: '热门'
  },
  {
    id: 5,
    title: '数据心理学的起源',
    description: '本课程深度解析，让您一次性掌握数据分析的心理学基础。适合希望从心理学角度理解数据的学习者。这是一门综合性的课程，涵盖了数据分析的各个方面。通过本课程的学习，您将能够掌握数据分析的核心技能。',
    image: 'https://images.unsplash.com/photo-1596495578065-6e0763fa1178?ixlib=rb-4.0.3&auto=format&fit=crop&w=400&q=80',
    category: 'psychology',
    level: '数学基础',
    duration: '免费',
    studentsCount: 1567,
    lessonsCount: 18,
    badge: '热门'
  },

])

// 计算属性
const filteredPaths = computed(() => {
  let filtered = learningPaths.value

  if (selectedCategory.value) {
    filtered = filtered.filter(path => path.category === selectedCategory.value)
  }

  return filtered
})

const totalPages = computed(() => Math.ceil(filteredPaths.value.length / pageSize))

const paginatedPaths = computed(() => {
  const start = (currentPage.value - 1) * pageSize
  const end = start + pageSize
  return filteredPaths.value.slice(start, end)
})

const visiblePages = computed(() => {
  const pages = []
  const total = totalPages.value
  const current = currentPage.value
  
  for (let i = Math.max(1, current - 2); i <= Math.min(total, current + 2); i++) {
    pages.push(i)
  }
  
  return pages
})

// 方法
const selectCategory = (category: string) => {
  selectedCategory.value = category
  currentPage.value = 1
}

const goToPage = (page: number) => {
  currentPage.value = page
}

const goToPath = (pathId: number) => {
  router.push(`/learning-path/${pathId}`)
}

onMounted(() => {
  // 页面加载时的初始化逻辑
  console.log('学习路径页面加载完成')
})
</script>

<style scoped>
.learning-paths-page {
  min-height: 100vh;
  background-color: #f8f9fa;
}

/* 页面标题区域 */
.page-header {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  padding: 60px 0;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, rgba(255,255,255,0.1) 25%, transparent 25%),
              linear-gradient(-45deg, rgba(255,255,255,0.1) 25%, transparent 25%),
              linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.1) 75%),
              linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.1) 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  opacity: 0.1;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
}

.header-content {
  text-align: center;
  color: white;
}

.page-title {
  font-size: 48px;
  font-weight: 700;
  margin: 0 0 16px 0;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.page-subtitle {
  font-size: 18px;
  font-weight: 400;
  margin: 0;
  opacity: 0.9;
}

.header-decoration {
  position: absolute;
  right: 50px;
  top: 50%;
  transform: translateY(-50%);
}

.decoration-image {
  width: 200px;
  height: auto;
  opacity: 0.8;
}

/* 主要内容区域 */
.main-content {
  padding: 40px 0 80px;
  background-color: rgb(246, 246, 246);
}

.content-layout {
  display: flex;
  gap: 30px;
  align-items: flex-start;
}

/* 左侧筛选栏 */
.filter-sidebar {
  width: 280px;
  flex-shrink: 0;
}

.filter-section {
  background: white;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 0;
  box-shadow: none;
  border: 1px solid #e9ecef;
}

.filter-title {
  font-size: 16px;
  font-weight: 600;
  color: #333;
  margin: 0 0 20px 0;
  padding: 0;
  /* 所有路径标题直接显示在灰色背景上，无背景样式 */
}

.filter-options {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.filter-option {
  display: flex;
  align-items: center;
  padding: 10px 0;
  border-radius: 0;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  border-bottom: 1px solid #e9ecef;
  background: transparent;
}

.filter-option:last-child {
  border-bottom: none;
}

.filter-option:hover {
  background-color: transparent;
}

.filter-option.active .option-text {
  color: #1976d2;
  font-weight: 500;
}

.filter-option.active .blue-icon {
  color: #1976d2;
}

.option-icon {
  display: inline-block;
  margin-right: 8px;
  font-size: 12px;
  width: 12px;
  height: 12px;
  line-height: 1;
  flex-shrink: 0;
}

.blue-icon {
  color: #1976d2;
}

.gray-icon {
  color: #999;
}

.option-text {
  font-size: 14px;
  font-weight: 400;
  color: #666;
  line-height: 1.4;
  word-wrap: break-word;
  word-break: break-word;
  flex: 1;
}

/* 右侧内容区域 */
.content-main {
  flex: 1;
}

.content-title {
  font-size: 16px;
  font-weight: 600;
  color: #333;
  margin: 0 0 20px 0;
  padding: 0;
  /* 课程标题直接显示在灰色背景上，无背景样式 */
}

.content-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding: 0;
  width: 100%;
}

.result-info {
  color: #666;
  font-size: 14px;
}

.result-stats {
  font-weight: 400;
  color: #666;
}

.sort-options {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sort-label {
  font-size: 14px;
  color: #666;
}

.sort-select {
  padding: 4px 8px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
  background: white;
  cursor: pointer;
  color: #666;
}

/* 学习路径列表 */
.paths-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 40px;
}

.path-card {
  background: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: all 0.2s;
  cursor: pointer;
  display: flex;
  min-height: 120px;
}

.path-card:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.card-image {
  position: relative;
  width: 160px;
  flex-shrink: 0;
  background: #f5f5f5;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-placeholder {
  width: 100%;
  height: 100%;
  background: #e0e0e0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: #ff6b35;
  color: white;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 11px;
  font-weight: 500;
}

.card-content {
  padding: 16px 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: #333;
  margin: 0 0 8px 0;
  line-height: 1.3;
}

.card-meta {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}

.meta-item {
  font-size: 12px;
  color: #666;
  background: #f8f9fa;
  padding: 2px 6px;
  border-radius: 3px;
}

.card-description {
  font-size: 13px;
  color: #666;
  line-height: 1.5;
  margin: 0 0 12px 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

.card-stats {
  display: flex;
  gap: 12px;
}

.stat-item {
  font-size: 12px;
  color: #999;
}

.card-rating {
  display: flex;
  align-items: center;
  gap: 4px;
}

.rating-icon {
  font-size: 14px;
}

.rating-text {
  font-size: 12px;
  color: #666;
  font-weight: 500;
}

/* 分页样式 */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 40px;
}

.page-btn {
  padding: 8px 16px;
  border: 1px solid #ddd;
  background: white;
  color: #666;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
  min-width: 40px;
}

.page-btn:hover:not(:disabled) {
  border-color: #2196f3;
  color: #2196f3;
}

.page-btn.active {
  background: #2196f3;
  border-color: #2196f3;
  color: white;
}

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

/* 响应式设计 */
@media (max-width: 1024px) {
  .content-layout {
    flex-direction: column;
  }

  .filter-sidebar {
    width: 100%;
  }

  .filter-options {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 12px;
  }

  .filter-option {
    flex: 0 0 auto;
  }
}

@media (max-width: 768px) {
  .page-header {
    padding: 40px 0;
  }

  .page-title {
    font-size: 32px;
  }

  .page-subtitle {
    font-size: 16px;
  }

  .header-decoration {
    display: none;
  }

  .paths-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .content-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .sort-options {
    align-self: flex-end;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .main-content {
    padding: 20px 0 40px;
  }

  .filter-section {
    padding: 16px;
  }

  .card-content {
    padding: 16px;
  }

  .pagination {
    gap: 4px;
  }

  .page-btn {
    padding: 6px 12px;
    font-size: 12px;
    min-width: 32px;
  }
}
</style>
