import { View, Image } from '@tarojs/components'
import { Search, Swiper, SwiperItem, Grid, GridItem } from '@antmjs/vantui'
import { useState, useEffect } from 'react'
import Taro from '@tarojs/taro'
import { getHomeData } from '@/api/home'
import type { CarouselItem, GridNavItem } from '@/api/home'
import './index.less'

// 背景图
import bgImg from '../../../static/img/bg.png'

// ==================== 本地兜底数据 ====================

// ==================== 工具函数 ====================

/** 排序 + 过滤启用的项 */
function prepareItems<T extends { status: number; sort: number }>(items: T[]): T[] {
  return items
    .filter((item) => item.status === 0)
    .sort((a, b) => a.sort - b.sort)
}

/** 处理导航跳转 */
function handleNavigate(link: string): void {
  if (!link) return
  if(link.startsWith('http')) {
    window.location.href = link
  } else {
    Taro.navigateTo({ url: link }).catch(() => {
      Taro.switchTab({ url: link }).catch(() => {
        console.warn('导航失败:', link)
      })
    })
  }
}

// ==================== 页面组件 ====================

export default function Index() {
  const [searchValue, setSearchValue] = useState('')
  const [carousel, setCarousel] = useState<CarouselItem[]>([])
  const [gridNav, setGridNav] = useState<GridNavItem[]>([])
  const [loading, setLoading] = useState(true)

  // 获取首页数据
  useEffect(() => {
    async function fetchHomeData() {
      try {
        const res = await getHomeData()
        if (res.success && res.data) {
          // 轮播图：API 有数据则用，否则兜底
          if (res.data.carousel?.length > 0) {
            setCarousel(prepareItems(res.data.carousel))
          }
          // 宫格导航：API 有数据则用，否则兜底
          if (res.data.gridNav?.length > 0) {
            setGridNav(prepareItems(res.data.gridNav))
          }
        }
      } catch (err) {
        console.warn('获取首页数据失败，使用本地兜底数据', err)
      } finally {
        setLoading(false)
      }
    }

    fetchHomeData()
  }, [])

  return (
    <View className='index'>
      {/* 背景图层 */}
      <Image className='bg-image' src={bgImg} mode='widthFix' />

      {/* 内容层 */}
      <View className='index-content'>
        {/* 1. 顶部搜索栏 */}
        <View className='search-wrapper'>
          <Search
            value={searchValue}
            onChange={(e) => setSearchValue(e.detail)}
            shape='round'
            placeholder='搜索美食、餐厅...'
            background='rgba(255,255,255,0.9)'
            onSearch={() => {
              // 搜索逻辑
            }}
          />
        </View>

        {/* 2. 中间轮播图 */}
        <View className='swiper-wrapper'>
          {carousel.length > 0 ? (
            <Swiper
              autoPlay={3000}
              loop
              paginationVisible
              paginationColor='#ffffff'
              duration={500}
              height={220}
            >
              {carousel.map((item) => (
                <SwiperItem key={item.id}>
                  <Image
                    className='swiper-img'
                    src={item.image.preview_url}
                    mode='aspectFill'
                    onClick={() => handleNavigate(item.link)}
                  />
                </SwiperItem>
              ))}
            </Swiper>
          ) : (
            <View className='swiper-placeholder'>暂无轮播图</View>
          )}
        </View>

        {/* 3. 宫格导航 */}
        <View className='grid-wrapper'>
          {gridNav.length > 0 ? (
            <Grid columnNum={5} border={false} gutter={12} iconSize={48}>
              {gridNav.map((item) => (
                <GridItem
                  key={item.id}
                  icon={item.image.preview_url}
                  text={item.title}
                  onClick={() => handleNavigate(item.link)}
                />
              ))}
            </Grid>
          ) : (
            <View className='grid-placeholder'>暂无分类</View>
          )}
        </View>

        {/* 4. 底部推荐卡片 */}
        <View className='bottom-section'>
          <View className='section-card card-hot'>
            <View className='card-icon'>🔥</View>
            <View className='card-info'>
              <View className='card-title'>热门推荐</View>
              <View className='card-desc'>查看同学们都在点什么</View>
            </View>
            <View className='card-arrow'>›</View>
          </View>

          <View className='section-card card-discount'>
            <View className='card-icon'>💰</View>
            <View className='card-info'>
              <View className='card-title'>限时优惠</View>
              <View className='card-desc'>超值套餐低至9.9元</View>
            </View>
            <View className='card-arrow'>›</View>
          </View>

          <View className='section-card card-new'>
            <View className='card-icon'>⭐</View>
            <View className='card-info'>
              <View className='card-title'>新品上架</View>
              <View className='card-desc'>尝尝校园新味道</View>
            </View>
            <View className='card-arrow'>›</View>
          </View>

          <View className='section-card card-order'>
            <View className='card-icon'>📋</View>
            <View className='card-info'>
              <View className='card-title'>我的订单</View>
              <View className='card-desc'>查看订单状态与历史</View>
            </View>
            <View className='card-arrow'>›</View>
          </View>
        </View>

        {/* 底部留白 */}
        <View className='bottom-spacer' />
      </View>
    </View>
  )
}