<template>
  <div class="mobile-bottom-nav" :class="{ 'scrollable': navItems.length > 5 }" v-if="isMobile && show">
    <div 
      v-for="item in navItems" 
      :key="item.path || item.label || item.icon"
      class="nav-item"
      :class="{ 'active': isActive(item.path) }"
      @click="handleNavClick(item)"
    >
      <div class="nav-icon">
        <i :class="item.icon" v-if="item.icon"></i>
        <svg-icon :icon-class="item.iconClass" v-else-if="item.iconClass" />
        <el-badge :value="item.badge" :hidden="!item.badge" v-if="item.badge">
          <div class="icon-placeholder"></div>
        </el-badge>
      </div>
      <div class="nav-label">{{ item.label }}</div>
    </div>
  </div>
</template>

<script>
import { mapGetters } from 'vuex'

export default {
  name: 'MobileBottomNav',
  props: {
    items: {
      type: Array,
      default: () => []
    },
    show: {
      type: Boolean,
      default: true
    }
  },
  computed: {
    ...mapGetters(['device', 'sidebarRouters']),
    isMobile() {
      return this.device === 'mobile' || window.innerWidth < 768
    },
    navItems() {
      // 如果提供了自定义 items，直接使用
      if (this.items && this.items.length > 0) {
        return this.items
      }
      // 始终从 store 的 sidebarRouters 计算，保证与接口返回、路由注册一致，避免移动端菜单/跳转错乱
      const routes = this.sidebarRouters || []
      const flatRoutes = this.flattenRoutes(routes)
      const mainRoutes = flatRoutes.filter(route => {
        const excludePaths = ['/redirect', '/login', '/register', '/404', '/401', '/user/profile']
        const path = route.path || ''
        return path &&
          path !== '/' &&
          !excludePaths.some(exclude => path.includes(exclude)) &&
          !path.startsWith('/user/')
      })
      if (mainRoutes.length > 0) {
        return mainRoutes
      }
      return [
        { path: '/user/profile', label: '我的', icon: 'el-icon-s-home' }
      ]
    }
  },
  methods: {
    /** 扁平化路由为叶子节点，路径与 Vue Router 注册的完整 path 一致 */
    flattenRoutes(routes, parentPath = '') {
      if (!routes || !Array.isArray(routes)) return []
      const result = []
      routes.forEach(route => {
        if (route.hidden) return
        let fullPath = (route.path || '').trim()
        if (parentPath) {
          if (fullPath.startsWith('/')) {
            // 已是绝对路径，直接使用
          } else {
            const base = parentPath.endsWith('/') ? parentPath.slice(0, -1) : parentPath
            fullPath = `${base}/${fullPath}`.replace(/\/+/g, '/')
          }
        }
        if (fullPath && !fullPath.startsWith('/')) {
          fullPath = '/' + fullPath
        }
        if (route.children && route.children.length > 0) {
          result.push(...this.flattenRoutes(route.children, fullPath))
        } else if (route.meta && route.meta.title && fullPath) {
          result.push({
            path: fullPath,
            label: route.meta.title,
            icon: route.meta.icon || 'el-icon-menu',
            iconClass: route.meta.icon,
            route
          })
        }
      })
      return result
    },
    isActive(path) {
      if (!path) return false
      const currentPath = this.$route.path
      return currentPath === path || currentPath.startsWith(path + '/')
    },
    handleNavClick(item) {
      if (item.handler) {
        item.handler()
        this.$emit('nav-click', item)
        return
      }
      
      if (item.path) {
        // 确保路径正确
        let path = item.path
        if (!path.startsWith('/')) {
          path = `/${path}`
        }
        
        // 移除末尾的斜杠（除了根路径）
        if (path !== '/' && path.endsWith('/')) {
          path = path.slice(0, -1)
        }
        
        // 尝试导航
        this.$router.push(path).catch(err => {
          // 如果push失败，尝试replace
          if (err.name !== 'NavigationDuplicated') {
            this.$router.replace(path).catch(() => {
              console.error('Navigation to', path, 'failed')
              // 不显示错误消息，避免打扰用户
            })
          }
        })
      }
      
      this.$emit('nav-click', item)
    }
  }
}
</script>

<style lang="scss" scoped>
.mobile-bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: #fff;
  border-top: 1px solid #e4e7ed;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
  padding-bottom: env(safe-area-inset-bottom);
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  padding: 0 4px;
  
  // 隐藏滚动条但保持滚动功能
  &::-webkit-scrollbar {
    display: none;
  }
  -ms-overflow-style: none;
  scrollbar-width: none;

  &.scrollable {
    justify-content: flex-start;
  }
  
  .nav-item {
    flex: 0 0 auto;
    min-width: 70px;
    max-width: 90px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 6px 4px;
    cursor: pointer;
    transition: all 0.3s;
    -webkit-tap-highlight-color: transparent;
    
    .nav-icon {
      width: 28px;
      height: 28px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 4px;
      position: relative;
      
      i, .svg-icon {
        font-size: 22px;
        color: #909399;
        transition: all 0.3s;
      }
      
      .icon-placeholder {
        width: 22px;
        height: 22px;
      }
    }
    
    .nav-label {
      font-size: 11px;
      color: #909399;
      transition: all 0.3s;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      max-width: 100%;
      text-align: center;
      line-height: 1.2;
    }
    
    &.active {
      .nav-icon {
        i, .svg-icon {
          color: #409eff;
          font-size: 24px;
        }
      }
      
      .nav-label {
        color: #409eff;
        font-weight: 600;
      }
    }
    
    &:active {
      transform: scale(0.95);
      opacity: 0.8;
    }
  }
}

// 桌面端隐藏
@media (min-width: 769px) {
  .mobile-bottom-nav {
    display: none;
  }
}

// 为底部导航预留空间
@media (max-width: 768px) {
  .app-main {
    padding-bottom: 60px !important;
  }
}
</style>

