<template>
  <div class="dashboard">
    <!-- 左侧导航栏 -->
    <aside class="sidebar">
      <div class="logo">
        <div class="logo-icon"></div>
        <span>LOGO</span>
      </div>
      <nav class="nav-menu">
        <div class="nav-item active">
          <el-icon><Grid /></el-icon>
          <span>数据仪表台</span>
        </div>
        <div class="nav-item" @click="goToUsers">
          <el-icon><User /></el-icon>
          <span>会员管理</span>
        </div>
        <div class="nav-item" @click="goToOrders">
          <el-icon><ShoppingCart /></el-icon>
          <span>订单管理</span>
        </div>
        <div class="nav-item" @click="goToAPI">
          <el-icon><Code /></el-icon>
          <span>API管理</span>
        </div>
        <div class="nav-item" @click="goToTasks">
          <el-icon><Document /></el-icon>
          <span>生成任务记录</span>
        </div>
        <div class="nav-item" @click="goToSettings">
          <el-icon><Setting /></el-icon>
          <span>系统设置</span>
        </div>
      </nav>
      <div class="sidebar-footer">
        <div class="online-users">
          当前在线用户: <span class="highlight">87/500</span>
        </div>
        <div class="system-uptime">
          系统运行时间: <span class="highlight">48小时32分</span>
        </div>
      </div>
    </aside>

    <!-- 主内容区域 -->
    <main class="main-content">
      <!-- 顶部搜索栏 -->
      <header class="top-header">
        <div class="search-bar">
          <el-icon class="search-icon"><Search /></el-icon>
          <input type="text" placeholder="搜索你的想要的内容" class="search-input" />
        </div>
        <div class="header-actions">
          <el-icon class="notification-icon"><Bell /></el-icon>
          <div class="user-avatar">
            <img src="/images/backgrounds/welcome.jpg" alt="用户头像" />
            <el-icon class="dropdown-icon"><ArrowDown /></el-icon>
          </div>
        </div>
      </header>

      <!-- KPI 卡片区域 -->
      <section class="kpi-section">
        <div class="kpi-card">
          <div class="kpi-icon user-icon">
            <el-icon><User /></el-icon>
          </div>
          <div class="kpi-content">
            <div class="kpi-title">用户总数</div>
            <div class="kpi-value">12,847</div>
            <div class="kpi-trend positive">+12% 较上月同期</div>
          </div>
        </div>
        
        <div class="kpi-card">
          <div class="kpi-icon paid-user-icon">
            <el-icon><User /></el-icon>
            <div class="currency-symbol">¥</div>
          </div>
          <div class="kpi-content">
            <div class="kpi-title">付费用户数</div>
            <div class="kpi-value">3,215</div>
            <div class="kpi-trend negative">-5% 较上月同期</div>
          </div>
        </div>
        
        <div class="kpi-card">
          <div class="kpi-icon revenue-icon">
            <el-icon><Money /></el-icon>
          </div>
          <div class="kpi-content">
            <div class="kpi-title">今日收入</div>
            <div class="kpi-value">¥28,450</div>
            <div class="kpi-trend positive">+15% 较上月同期</div>
          </div>
        </div>
      </section>

      <!-- 图表区域 -->
      <section class="charts-section">
        <!-- 日活用户趋势图 -->
        <div class="chart-card full-width">
          <div class="chart-header">
            <h3>日活用户趋势</h3>
            <div class="year-selector">
              <span>2025年</span>
              <el-icon><ArrowDown /></el-icon>
            </div>
          </div>
          <div class="chart-container">
            <div class="line-chart">
              <!-- 动态SVG曲线图 -->
              <svg width="100%" height="200" :viewBox="`0 0 ${chartWidth} ${chartHeight}`" class="chart-svg">
                <!-- 网格线 -->
                <defs>
                  <pattern id="grid" width="60" height="40" patternUnits="userSpaceOnUse">
                    <path d="M 60 0 L 0 0 0 40" fill="none" stroke="#e2e8f0" stroke-width="0.5"/>
                  </pattern>
                </defs>
                <rect width="100%" height="100%" fill="url(#grid)" />
                
                <!-- 动态数据曲线 -->
                <path :d="chartPath" 
                      fill="none" 
                      stroke="#3b82f6" 
                      stroke-width="3" 
                      class="chart-line-path"/>
                
                <!-- 动态数据点 -->
                <circle 
                  v-for="(point, index) in chartPoints" 
                  :key="index"
                  :cx="point.x" 
                  :cy="point.y" 
                  r="4" 
                  fill="#3b82f6" 
                  class="chart-dot"
                  @click="handlePointClick(point)"
                  style="cursor: pointer;"/>
                
                <!-- 高亮数据点 -->
                <template v-if="highlightedPoint">
                  <circle 
                    :cx="highlightedPoint.x" 
                    :cy="highlightedPoint.y" 
                    r="6" 
                    fill="#3b82f6" 
                    class="highlight-dot"/>
                  <circle 
                    :cx="highlightedPoint.x" 
                    :cy="highlightedPoint.y" 
                    r="12" 
                    fill="#3b82f6" 
                    opacity="0.2" 
                    class="highlight-ring"/>
                  
                  <!-- 动态工具提示 -->
                  <g class="tooltip-group" :transform="`translate(${highlightedPoint.x}, ${highlightedPoint.y - 20})`">
                    <rect x="-30" y="-40" width="60" height="30" rx="6" fill="#1e293b" class="tooltip-bg"/>
                    <text x="0" y="-25" text-anchor="middle" fill="white" font-size="12" font-weight="600" class="tooltip-value">
                      {{ highlightedPoint.value.toLocaleString() }}
                    </text>
                    <text x="0" y="-10" text-anchor="middle" fill="white" font-size="10" opacity="0.8" class="tooltip-date">
                      {{ highlightedPoint.label }}
                    </text>
                    <!-- 工具提示箭头 -->
                    <polygon points="0,0 -5,10 5,10" fill="#1e293b" class="tooltip-arrow"/>
                  </g>
                </template>
              </svg>
            </div>
            <div class="chart-x-axis">
              <span v-for="data in monthlyData" :key="data.month">{{ data.label }}</span>
            </div>
            <div class="chart-y-axis">
              <span v-for="tick in [1500, 1200, 900, 600, 300, 0]" :key="tick">{{ tick }}</span>
            </div>
          </div>
        </div>

        <!-- 用户转化率图 -->
        <div class="chart-card full-width">
          <div class="chart-header">
            <h3>用户转化率</h3>
            <div class="year-selector">
              <span>2025年</span>
              <el-icon><ArrowDown /></el-icon>
            </div>
          </div>
          <div class="chart-container">
            <div class="bar-chart">
              <div class="bar" style="height: 15%;"></div>
              <div class="bar" style="height: 25%;"></div>
              <div class="bar" style="height: 20%;"></div>
              <div class="bar" style="height: 30%;"></div>
              <div class="bar" style="height: 18%;"></div>
              <div class="bar" style="height: 22%;"></div>
              <div class="bar" style="height: 28%;"></div>
              <div class="bar" style="height: 35%;"></div>
              <div class="bar active" style="height: 40%;"></div>
              <div class="bar" style="height: 25%;"></div>
              <div class="bar" style="height: 20%;"></div>
              <div class="bar" style="height: 18%;"></div>
            </div>
            <div class="chart-x-axis">
              <span>1月</span>
              <span>2月</span>
              <span>3月</span>
              <span>4月</span>
              <span>5月</span>
              <span>6月</span>
              <span>7月</span>
              <span>8月</span>
              <span>9月</span>
              <span>10月</span>
              <span>11月</span>
              <span>12月</span>
            </div>
            <div class="chart-y-axis">
              <span>20%</span>
              <span>15%</span>
              <span>10%</span>
              <span>5%</span>
              <span>0%</span>
            </div>
          </div>
        </div>
      </section>
    </main>
  </div>
</template>

<script setup>
import { ref, onMounted, computed } from 'vue'
import { useRouter } from 'vue-router'
import { useUserStore } from '@/stores/user'
import { ElMessage } from 'element-plus'

const router = useRouter()
const userStore = useUserStore()

// 模拟数据 - 实际项目中应该从API获取
const monthlyData = ref([
  { month: 1, value: 1200, label: '1月' },
  { month: 2, value: 1100, label: '2月' },
  { month: 3, value: 1000, label: '3月' },
  { month: 4, value: 900, label: '4月' },
  { month: 5, value: 800, label: '5月' },
  { month: 6, value: 1000, label: '6月' },
  { month: 7, value: 1200, label: '7月' },
  { month: 8, value: 1150, label: '8月' },
  { month: 9, value: 1300, label: '9月' },
  { month: 10, value: 1250, label: '10月' },
  { month: 11, value: 1100, label: '11月' },
  { month: 12, value: 950, label: '12月' }
])

const selectedYear = ref(2025)
const highlightedPoint = ref(null)

// 计算图表尺寸和比例
const chartWidth = 800
const chartHeight = 200
const padding = 60

// 计算数据点的SVG坐标
const chartPoints = computed(() => {
  const maxValue = Math.max(...monthlyData.value.map(d => d.value))
  const minValue = Math.min(...monthlyData.value.map(d => d.value))
  const valueRange = maxValue - minValue
  
  return monthlyData.value.map((data, index) => {
    const x = padding + (index * (chartWidth - 2 * padding) / (monthlyData.value.length - 1))
    const y = padding + ((maxValue - data.value) / valueRange) * (chartHeight - 2 * padding)
    return {
      x,
      y,
      value: data.value,
      label: data.label,
      month: data.month
    }
  })
})

// 生成SVG路径
const chartPath = computed(() => {
  if (chartPoints.value.length < 2) return ''
  
  let path = `M ${chartPoints.value[0].x},${chartPoints.value[0].y}`
  
  for (let i = 1; i < chartPoints.value.length; i++) {
    const prev = chartPoints.value[i - 1]
    const curr = chartPoints.value[i]
    const next = chartPoints.value[i + 1]
    
    if (next) {
      // 使用三次贝塞尔曲线创建平滑路径
      const cp1x = prev.x + (curr.x - prev.x) / 3
      const cp1y = prev.y
      const cp2x = curr.x - (next.x - curr.x) / 3
      const cp2y = curr.y
      
      path += ` C ${cp1x},${cp1y} ${cp2x},${cp2y} ${curr.x},${curr.y}`
    } else {
      // 最后一个点
      const cp1x = prev.x + (curr.x - prev.x) / 3
      const cp1y = prev.y
      path += ` C ${cp1x},${cp1y} ${curr.x},${curr.y} ${curr.x},${curr.y}`
    }
  }
  
  return path
})

// 处理数据点点击
const handlePointClick = (point) => {
  highlightedPoint.value = point
}

// 导航功能
const goToUsers = () => {
  router.push('/member-management')
}

const goToOrders = () => {
  if (userStore.isAuthenticated) {
    router.push('/orders')
  } else {
    ElMessage.warning('请先登录')
    router.push('/login')
  }
}

const goToAPI = () => {
  ElMessage.info('跳转到API管理')
}

const goToTasks = () => {
  ElMessage.info('跳转到生成任务记录')
}

const goToSettings = () => {
  ElMessage.info('跳转到系统设置')
}

// 模拟数据加载
const loadChartData = async () => {
  try {
    // 这里应该调用真实的API
    // const response = await fetch('/api/dashboard/monthly-active-users')
    // const data = await response.json()
    // monthlyData.value = data
    
    // 模拟API延迟
    await new Promise(resolve => setTimeout(resolve, 500))
    
    // 可以在这里更新数据
    console.log('图表数据加载完成')
  } catch (error) {
    console.error('加载图表数据失败:', error)
    ElMessage.error('加载数据失败')
  }
}

onMounted(() => {
  loadChartData()
})
</script>

<style scoped>
.dashboard {
  display: flex;
  min-height: 100vh;
  background: #f8fafc;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* 左侧导航栏 */
.sidebar {
  width: 320px;
  background: white;
  border-right: 1px solid #e2e8f0;
  display: flex;
  flex-direction: column;
  padding: 24px 0;
}

.logo {
  display: flex;
  align-items: center;
  padding: 0 28px;
  margin-bottom: 32px;
}

.logo-icon {
  width: 24px;
  height: 24px;
  background: #3b82f6;
  border-radius: 4px;
  margin-right: 12px;
}

.logo span {
  font-size: 18px;
  font-weight: 600;
  color: #1e293b;
}

.nav-menu {
  flex: 1;
  padding: 0 24px;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 18px 24px;
  margin-bottom: 6px;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  color: #64748b;
  font-size: 16px;
}

.nav-item:hover {
  background: #f1f5f9;
  color: #334155;
}

.nav-item.active {
  background: #eff6ff;
  color: #3b82f6;
}

.nav-item .el-icon {
  margin-right: 16px;
  font-size: 22px;
}

.nav-item span {
  font-size: 16px;
  font-weight: 500;
}

.sidebar-footer {
  padding: 0 32px 20px;
  margin-top: auto;
}

.online-users,
.system-uptime {
  font-size: 14px;
  color: #64748b;
  margin-bottom: 10px;
  line-height: 1.5;
}

.highlight {
  color: #3b82f6;
  font-weight: 600;
  font-size: 15px;
}

/* 主内容区域 */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: #f8fafc;
}

/* 顶部搜索栏 */
.top-header {
  background: white;
  border-bottom: 1px solid #e2e8f0;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.search-bar {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 12px;
  color: #94a3b8;
  font-size: 16px;
}

.search-input {
  width: 300px;
  padding: 8px 12px 8px 40px;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  font-size: 14px;
  background: #f8fafc;
  outline: none;
}

.search-input:focus {
  border-color: #3b82f6;
  background: white;
}

.search-input::placeholder {
  color: #94a3b8;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.notification-icon {
  font-size: 20px;
  color: #64748b;
  cursor: pointer;
}

.user-avatar {
  display: flex;
  align-items: center;
  cursor: pointer;
}

.user-avatar img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  margin-right: 8px;
}

.dropdown-icon {
  font-size: 12px;
  color: #64748b;
}

/* KPI 卡片区域 */
.kpi-section {
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.kpi-card {
  background: white;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  gap: 16px;
}

.kpi-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.kpi-icon .el-icon {
  font-size: 24px;
}

.user-icon {
  background: #fef3c7;
  color: #f59e0b;
}

.paid-user-icon {
  background: #dbeafe;
  color: #3b82f6;
}

.paid-user-icon .currency-symbol {
  position: absolute;
  bottom: -2px;
  right: -2px;
  width: 16px;
  height: 16px;
  background: #3b82f6;
  color: white;
  border-radius: 50%;
  font-size: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.revenue-icon {
  background: #fce7f3;
  color: #ec4899;
}

.kpi-content {
  flex: 1;
}

.kpi-title {
  font-size: 14px;
  color: #64748b;
  margin-bottom: 8px;
}

.kpi-value {
  font-size: 24px;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 4px;
}

.kpi-trend {
  font-size: 12px;
  font-weight: 500;
}

.kpi-trend.positive {
  color: #059669;
}

.kpi-trend.negative {
  color: #dc2626;
}

/* 图表区域 */
.charts-section {
  padding: 0 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.chart-card.full-width {
  width: 100%;
}

.chart-card {
  background: white;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.chart-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: #1e293b;
  margin: 0;
}

.year-selector {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #64748b;
  font-size: 14px;
  cursor: pointer;
}

.chart-container {
  position: relative;
  height: 300px;
}

/* 日活用户趋势图 - SVG曲线图 */
.line-chart {
  position: relative;
  width: 100%;
  height: 200px;
  margin-bottom: 20px;
  background: white;
  border-radius: 8px;
  overflow: hidden;
}

.chart-svg {
  width: 100%;
  height: 100%;
}

.chart-line-path {
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
  animation: drawLine 2s ease-in-out forwards;
}

.chart-dot {
  opacity: 0;
  animation: fadeInDots 0.5s ease-in-out forwards;
  animation-delay: 1.5s;
}

.highlight-dot {
  opacity: 0;
  animation: highlightDot 0.5s ease-in-out forwards;
  animation-delay: 2s;
}

.highlight-ring {
  opacity: 0;
  animation: highlightRing 1s ease-in-out infinite;
  animation-delay: 2s;
}

.tooltip-group {
  opacity: 0;
  animation: fadeInTooltip 0.5s ease-in-out forwards;
  animation-delay: 2.5s;
}

.tooltip-bg {
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.15));
}

.tooltip-arrow {
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

/* 动画效果 */
@keyframes drawLine {
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes fadeInDots {
  to {
    opacity: 1;
  }
}

@keyframes highlightDot {
  to {
    opacity: 1;
  }
}

@keyframes highlightRing {
  0%, 100% {
    opacity: 0.2;
    transform: scale(1);
  }
  50% {
    opacity: 0.4;
    transform: scale(1.2);
  }
}

@keyframes fadeInTooltip {
  to {
    opacity: 1;
  }
}

/* 悬停效果 */
.chart-dot:hover {
  r: 6;
  fill: #2563eb;
  transition: all 0.2s ease;
}

.highlight-dot:hover {
  r: 8;
  fill: #2563eb;
  transition: all 0.2s ease;
}

.chart-x-axis {
  display: flex;
  justify-content: space-between;
  padding: 0 20px;
  font-size: 12px;
  color: #64748b;
}

.chart-y-axis {
  position: absolute;
  left: 0;
  top: 0;
  height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  font-size: 12px;
  color: #64748b;
}

/* 用户转化率图 */
.bar-chart {
  display: flex;
  align-items: end;
  justify-content: space-between;
  height: 200px;
  margin-bottom: 20px;
  padding: 0 20px;
}

.bar {
  width: 20px;
  background: #dbeafe;
  border-radius: 2px 2px 0 0;
  transition: all 0.3s ease;
}

.bar.active {
  background: #3b82f6;
}

.bar:hover {
  background: #2563eb;
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .kpi-section {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .dashboard {
    flex-direction: column;
  }
  
  .sidebar {
    width: 100%;
    height: auto;
  }
  
  .nav-menu {
    display: flex;
    overflow-x: auto;
    padding: 0 16px;
  }
  
  .nav-item {
    white-space: nowrap;
    margin-right: 16px;
    margin-bottom: 0;
  }
  
  .sidebar-footer {
    display: none;
  }
  
  .search-input {
    width: 200px;
  }
  
  .kpi-section {
    padding: 16px;
  }
  
  .charts-section {
    padding: 0 16px 16px;
  }
}
</style>
