<template>
  <div class="project-layout">
    <!-- Sidebar -->
    <aside class="sidebar" :class="{ collapsed: sidebarCollapsed }">
      <div class="sidebar-header">
        <div class="project-info" @click="goHome">
          <div class="back-btn">
            <el-icon><ArrowLeft /></el-icon>
          </div>
          <div class="project-details">
            <h2 class="project-name">{{ project.name }}</h2>
            <p class="project-desc">{{ project.description || '数据生成项目' }}</p>
          </div>
        </div>
        <button class="collapse-btn" @click="sidebarCollapsed = !sidebarCollapsed">
          <el-icon><DArrowLeft v-if="!sidebarCollapsed" /><DArrowRight v-else /></el-icon>
        </button>
      </div>

      <nav class="sidebar-nav">
        <router-link
          v-for="item in navItems"
          :key="item.path"
          :to="`/project/${id}/${item.path}`"
          class="nav-item"
          :class="{ active: isActive(item.path) }"
        >
          <div class="nav-icon">
            <el-icon size="20"><component :is="item.icon" /></el-icon>
          </div>
          <span class="nav-label">{{ item.label }}</span>
          <span class="nav-dot"></span>
        </router-link>
      </nav>

      <div class="sidebar-footer">
        <router-link to="/" class="home-link">
          <el-icon><HomeFilled /></el-icon>
          <span>返回首页</span>
        </router-link>
      </div>
    </aside>

    <!-- Main Content -->
    <main class="main-content">
      <router-view />
    </main>
  </div>
</template>

<script setup>
import { ref, computed, onMounted } from 'vue'
import { useRoute, useRouter } from 'vue-router'
import { projectApi } from '@/api'
import { ElMessage } from 'element-plus'

const route = useRoute()
const router = useRouter()

const id = computed(() => route.params.id)
const sidebarCollapsed = ref(false)

const project = ref({ name: '加载中...', description: '' })

const navItems = [
  { path: 'files', label: '文件管理', icon: 'Folder' },
  { path: 'split', label: '文本分割', icon: 'Operation' },
  { path: 'questions', label: '问答管理', icon: 'ChatDotSquare' },
  { path: 'datasets', label: '数据集', icon: 'Collection' },
  { path: 'eval', label: '评估系统', icon: 'DataAnalysis' },
  { path: 'settings', label: '项目设置', icon: 'Setting' }
]

const isActive = (path) => route.path.includes(path)

const fetchProject = async () => {
  try {
    const res = await projectApi.get(id.value)
    // New format: returns project directly
    project.value = res
  } catch (error) {
    ElMessage.error('加载项目失败')
  }
}

const goHome = () => router.push('/')

onMounted(() => fetchProject())
</script>

<style scoped>
.project-layout {
  display: flex;
  min-height: 100vh;
}

/* ========================
   Sidebar
   ======================== */
.sidebar {
  width: 280px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar.collapsed {
  width: 72px;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.collapse-btn {
  position: absolute;
  right: -12px;
  top: 28px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 50%;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 10;
}

.collapse-btn:hover {
  background: var(--accent-primary-muted);
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

.project-info {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
  flex: 1;
  min-width: 0;
}

.back-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.project-info:hover .back-btn {
  background: var(--accent-primary-muted);
  color: var(--accent-primary);
}

.project-details {
  flex: 1;
  min-width: 0;
  transition: opacity 0.2s ease;
}

.sidebar.collapsed .project-details {
  opacity: 0;
  width: 0;
  overflow: hidden;
}

.project-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.project-desc {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Navigation */
.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
  margin-bottom: 4px;
  position: relative;
  overflow: hidden;
}

.nav-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-primary-muted);
  opacity: 0;
  transition: opacity var(--transition-fast);
  border-radius: var(--radius-md);
}

.nav-item:hover {
  color: var(--text-primary);
}

.nav-item:hover::before {
  opacity: 1;
}

.nav-item.active {
  color: var(--accent-primary);
}

.nav-item.active::before {
  opacity: 1;
}

.nav-icon {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.nav-label {
  position: relative;
  z-index: 1;
  white-space: nowrap;
  transition: opacity 0.2s ease;
}

.sidebar.collapsed .nav-label {
  opacity: 0;
  width: 0;
  overflow: hidden;
}

.nav-dot {
  position: absolute;
  right: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-primary);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.sidebar.collapsed .nav-dot {
  right: 50%;
  transform: translateX(50%);
}

.nav-item.active .nav-dot {
  opacity: 1;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border-subtle);
}

.home-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  font-size: 14px;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.home-link:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.home-link span {
  transition: opacity 0.2s ease;
}

.sidebar.collapsed .home-link span {
  opacity: 0;
  width: 0;
  overflow: hidden;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: 280px;
  min-height: 100vh;
  transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar.collapsed + .main-content,
.sidebar.collapsed ~ .main-content {
  margin-left: 72px;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    width: 72px;
  }

  .sidebar .project-details,
  .sidebar .nav-label,
  .sidebar .home-link span {
    display: none;
  }

  .main-content {
    margin-left: 72px;
  }

  .collapse-btn {
    display: none;
  }
}
</style>
