<template>
  <el-aside class="sidebar" :class="{ 'is-collapsed': isCollapsed }" :width="isCollapsed ? (isMobile ? '0' : '72px') : '260px'">
    <div class="sidebar-header">
      <div class="header-left">
        <transition name="fade">
          <span v-if="!isCollapsed" class="sidebar-title">笔记分类</span>
        </transition>
      </div>
      <div class="header-actions">
        <el-tooltip content="新建分类" placement="top" :disabled="isCollapsed && !isMobile">
          <el-button v-if="!isCollapsed || isMobile" type="primary" size="small" @click="$emit('show-create-group')" circle class="action-btn">
            <el-icon><Plus /></el-icon>
          </el-button>
        </el-tooltip>
        <el-tooltip :content="isCollapsed ? '展开' : '收起'" placement="top" v-if="!isMobile">
          <el-button @click="$emit('toggle-collapse')" type="primary" size="small" circle class="action-btn toggle-btn">
            <el-icon :class="{ 'rotate-180': isCollapsed }">
              <Fold />
            </el-icon>
          </el-button>
        </el-tooltip>
      </div>
    </div>

    <div class="sidebar-content">
      <el-menu
          :default-active="activeMenu"
          class="el-menu-vertical-demo"
          :collapse="isCollapsed && !isMobile"
          popper-effect="light"
          :collapse-transition="true"
          @select="handleMenuSelect"
      >
        <div class="menu-section" v-if="isMobile">
          <div v-if="userStore.isLoggedIn" class="user-info">
            <!-- 修复：添加默认值防止空指针 -->
            <el-avatar :size="40" class="user-avatar">{{ userStore.userInfo?.username?.charAt(0)?.toUpperCase() || '?' }}</el-avatar>
            <span class="username">{{ userStore.userInfo?.username || '访客' }}</span>
          </div>
          <div v-else class="guest-info">
            <el-button type="primary" @click="goToLogin">登录</el-button>
            <el-button @click="goToRegister">注册</el-button>
          </div>
        </div>

        <div class="menu-section">
          <div class="section-title" v-if="!isCollapsed">分类列表</div>
          <template v-for="menu in categoryTree" :key="menu.id">
            <component :is="renderMenu(menu)" />
          </template>
        </div>

        <div class="menu-section menu-footer">
          <ElMenuItem index="trash" @click="goToTrash" class="menu-item-trash">
            <ElIcon><Delete /></ElIcon>
            <template #title>回收站</template>
          </ElMenuItem>
          <template v-if="isMobile && userStore.isLoggedIn">
            <ElMenuItem index="system-settings" @click="$emit('show-system-settings')">
              <ElIcon><Setting /></ElIcon>
              <template #title>系统管理</template>
            </ElMenuItem>
            <ElMenuItem index="update-password" @click="$emit('show-update-password')">
              <ElIcon><Lock /></ElIcon>
              <template #title>修改密码</template>
            </ElMenuItem>
            <ElMenuItem index="logout" @click="$emit('logout')" class="menu-item-logout">
              <ElIcon><SwitchButton /></ElIcon>
              <template #title>退出登录</template>
            </ElMenuItem>
          </template>
        </div>
      </el-menu>
    </div>
  </el-aside>
</template>

<script setup>
import { h } from 'vue';
import { ElSubMenu, ElMenuItem, ElIcon, ElMessageBox, ElTooltip, ElMessage } from 'element-plus';
import { Folder, Delete, Edit, Plus, Fold, Expand, Setting, Lock, SwitchButton } from '@element-plus/icons-vue';
import { useUserStore } from '@/stores/user';
import { useRouter } from 'vue-router';
import { deleteGrouping } from '@/api/CommonApi.js';

const props = defineProps({
  isCollapsed: Boolean,
  isMobile: Boolean,
  activeMenu: String,
  categoryTree: Array,
});

const emit = defineEmits([
  'select-file',
  'show-rename-dialog',
  'show-create-group',
  'toggle-collapse',
  'group-deleted',
  'show-system-settings',
  'show-update-password',
  'logout'
]);

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

const goToTrash = () => router.push({ name: 'Trash' });
const goToLogin = () => router.push('/login');
const goToRegister = () => router.push('/register');

const handleMenuSelect = (index) => {
  if (index.startsWith('group-')) {
    const id = index.replace('group-', '');
    const findItem = (items) => {
      for (let item of items) {
        if (String(item.id) === id) return item;
        if (item.children) {
          const found = findItem(item.children);
          if (found) return found;
        }
      }
      return null;
    };
    const item = findItem(props.categoryTree);
    if (item) emit('select-file', item);
  }
};

const handleDeleteGroup = (group) => {
  ElMessageBox.confirm(
      `确定要删除分类 “${group.grouping}” 吗？这将同时删除该分类下的所有子分类和笔记。`,
      '警告',
      { confirmButtonText: '确定', cancelButtonText: '取消', type: 'warning' }
  ).then(async () => {
    try {
      await deleteGrouping(group.id);
      ElMessage.success('分类已删除');
      emit('group-deleted');
    } catch (error) {
      // 错误已在 axios 拦截器中显示，这里不再重复显示
      console.error('删除分类失败:', error);
    }
  });
};

const renderMenu = (item) => {
  const titleContent = () => h('div', { class: 'menu-item-title' }, [
    h(ElIcon, () => h(Folder)),
    h('span', { class: 'menu-item-text' }, item.grouping),
    h('div', { class: 'menu-item-actions' }, [
      h(ElIcon, { class: 'edit-icon', onClick: (e) => { e.stopPropagation(); emit('show-rename-dialog', item, 'group'); } }, () => h(Edit)),
      h(ElIcon, { class: 'delete-icon', onClick: (e) => { e.stopPropagation(); handleDeleteGroup(item); } }, () => h(Delete))
    ])
  ]);

  const wrappedContent = () => h(ElTooltip, {
    content: item.grouping,
    placement: 'right',
    disabled: !props.isCollapsed,
    effect: 'dark',
    offset: 15,
  }, { default: titleContent });

  if (item.children && item.children.length > 0) {
    return h(ElSubMenu, {
      index: `group-${item.id}`,
      popperClass: props.isCollapsed ? 'hide-popper' : '',
      class: { 'is-active': props.activeMenu === `group-${item.id}` },
      disabled: false
    }, {
      title: () => h('div', {
        class: 'submenu-title-wrapper',
        style: 'width: 100%; display: flex; align-items: center;'
      }, [ wrappedContent() ]),
      default: () => item.children.map(child => renderMenu(child))
    });
  }

  return h(ElMenuItem, { index: `group-${item.id}` }, {
    default: wrappedContent
  });
};
</script>

<style scoped>
.sidebar {
  background: #ffffff;
  border-right: 1px solid #e4e7ed;
  transition: width 0.25s ease;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 10;
}

.dark-theme .sidebar {
  background: #1e1e2f;
  border-right: 1px solid #2c2c3d;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  flex-shrink: 0;
  border-bottom: 1px solid #e4e7ed;
  min-height: 64px;
  transition: padding 0.25s ease;
}

.sidebar.is-collapsed .sidebar-header {
  padding: 1rem 0.5rem;
  justify-content: center;
}

.header-left {
  flex: 1;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.sidebar.is-collapsed .header-left {
  display: none;
}

.dark-theme .sidebar-header {
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

.sidebar-title {
  font-weight: 700;
  font-size: 16px;
  color: var(--text-color);
  letter-spacing: 0.3px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-color-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.sidebar.is-collapsed .header-actions {
  flex-direction: column;
  gap: 12px;
}

.action-btn {
  transition: transform 0.2s ease, color 0.2s ease;
}

.toggle-btn .el-icon {
  transition: transform 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.toggle-btn .el-icon.rotate-180 {
  transform: rotate(180deg);
}

.fade-enter-active, .fade-leave-active {
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.fade-enter-from, .fade-leave-to {
  opacity: 0;
  transform: translateX(-10px);
}

.sidebar-content {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.el-menu {
  border-right: none;
  background: transparent;
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0.75rem 0.25rem;
}

.el-menu::-webkit-scrollbar {
  width: 4px;
}

.el-menu::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.1);
  border-radius: 2px;
}

.el-menu::-webkit-scrollbar-track {
  background: transparent;
}

.menu-section {
  padding: 0 0.25rem;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-color-secondary);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  padding: 0.75rem 1rem 0.5rem;
  opacity: 0.6;
}

.sidebar.is-collapsed .section-title {
  display: none;
}

.menu-footer {
  margin-top: auto;
  border-top: 1px solid #e4e7ed;
  padding-top: 0.75rem;
}

.dark-theme .menu-footer {
  border-top-color: rgba(255, 255, 255, 0.06);
}

:deep(.el-menu-item), :deep(.el-sub-menu__title) {
  height: 46px;
  line-height: 46px;
  border-radius: 12px;
  margin: 2px 0.5rem;
  color: var(--text-color-secondary);
  transition: color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
  position: relative;
}

:deep(.el-menu-item::before), :deep(.el-sub-menu__title::before) {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--primary-color);
  border-radius: 0 3px 3px 0;
  transition: height 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

:deep(.el-menu-item:hover::before), :deep(.el-sub-menu__title:hover::before) {
  height: 20px;
}

:deep(.el-menu-item.is-active) {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-color-light) 100%);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(64, 158, 255, 0.35);
}

:deep(.el-menu-item.is-active::before) {
  height: 24px;
  background: #fff;
}

/* 移除嵌套 SubMenu 的 active 样式 */
:deep(.el-menu--inline .el-sub-menu.is-active > .el-sub-menu__title) {
  background: transparent !important;
  color: var(--text-color-secondary) !important;
  box-shadow: none !important;
}

:deep(.el-menu--inline .el-sub-menu.is-active > .el-sub-menu__title::before) {
  height: 0 !important;
}

/* 只有顶级 SubMenu 被直接选中时才显示 active 样式 */
:deep(.el-menu > .el-sub-menu.is-active > .el-sub-menu__title) {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-color-light) 100%) !important;
  color: #fff !important;
  font-weight: 600 !important;
  box-shadow: 0 4px 12px rgba(64, 158, 255, 0.35) !important;
}

:deep(.el-menu > .el-sub-menu.is-active > .el-sub-menu__title::before) {
  height: 24px !important;
  background: #fff !important;
}

:deep(.el-menu-item:hover), :deep(.el-sub-menu__title:hover) {
  background-color: rgba(64, 158, 255, 0.08);
  color: var(--primary-color);
  transform: translateX(2px);
}

.dark-theme :deep(.el-menu-item:hover),
.dark-theme :deep(.el-sub-menu__title:hover) {
  background-color: rgba(64, 158, 255, 0.15);
}

.menu-item-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 8px;
}

.menu-item-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex-grow: 1;
  font-size: 14px;
  font-weight: 500;
}

.menu-item-actions {
  display: none;
  align-items: center;
  gap: 4px;
  padding: 4px;
  background: #f5f7fa;
  border-radius: 8px;
}

.dark-theme .menu-item-actions {
  background: #2c2c3d;
}

.el-menu:not(.el-menu--collapse) .el-menu-item:hover .menu-item-actions,
.el-menu:not(.el-menu--collapse) .el-sub-menu__title:hover .menu-item-actions {
  display: flex;
}

.el-menu--collapse .menu-item-text,
.el-menu--collapse .menu-item-actions {
  opacity: 0;
  width: 0;
}

.edit-icon, .delete-icon {
  cursor: pointer;
  color: var(--text-color-secondary);
  padding: 6px;
  border-radius: 6px;
  transition: color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.edit-icon:hover {
  color: var(--primary-color);
  background: rgba(64, 158, 255, 0.12);
  transform: scale(1.1);
}

.delete-icon:hover {
  color: #f56c6c;
  background: rgba(245, 108, 108, 0.12);
  transform: scale(1.1);
}

.user-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.25rem 1rem;
  gap: 0.75rem;
  background: linear-gradient(135deg, rgba(64, 158, 255, 0.1) 0%, rgba(64, 158, 255, 0.05) 100%);
  border-radius: 16px;
  margin: 0.5rem;
  border: 1px solid rgba(64, 158, 255, 0.1);
}

.user-avatar {
  background: linear-gradient(135deg, var(--primary-color) 0%, #66b1ff 100%);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(64, 158, 255, 0.3);
}

.username {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-color);
}

.guest-info {
  display: flex;
  gap: 0.75rem;
  padding: 1rem;
  justify-content: center;
}

.menu-item-trash {
  color: var(--text-color-secondary) !important;
}

.menu-item-trash:hover {
  color: #e6a23c !important;
  background-color: rgba(230, 162, 60, 0.12) !important;
}

.menu-item-logout:hover {
  color: #f56c6c !important;
  background-color: rgba(245, 108, 108, 0.12) !important;
}

.sidebar.is-collapsed :deep(.el-menu-item),
.sidebar.is-collapsed :deep(.el-sub-menu__title) {
  margin: 4px 0.25rem;
  justify-content: center;
}

.sidebar.is-collapsed :deep(.el-icon) {
  font-size: 20px;
}
</style>
