import { NextRequest, NextResponse } from 'next/server'
import { getPayload } from 'payload'
import config from '@payload-config'
import { getCache, setCache } from '@/lib/redis'

/**
 * GET /api/public/product-recommendations
 * 获取商品推荐列表数据（带缓存）
 * 需要 x-store-api-key 验证
 */
export async function GET(req: NextRequest) {
  try {
    // 验证 API Key
    const apiKey = req.headers.get('x-store-api-key')
    const validApiKey = process.env.PAYLOAD_API_KEY

    if (!apiKey || !validApiKey || apiKey !== validApiKey) {
      return NextResponse.json({ success: false, error: 'Unauthorized' }, { status: 401 })
    }

    // 生成缓存 key
    const cacheKey = 'product-recommendations:data'

    // 尝试从缓存获取
    const cached = await getCache(cacheKey)
    if (cached) {
      return NextResponse.json({
        success: true,
        data: cached,
        cached: true,
      })
    }

    // 从数据库获取
    const payload = await getPayload({ config })
    const result = await payload.findGlobal({
      slug: 'product-recommendations' as any,
      depth: 3, // 填充商品和图片关联数据
    })

    // 如果功能未启用，返回空数据
    if (!(result as any).enabled) {
      const emptyData = {
        enabled: false,
        lists: [],
      }

      // 缓存空数据（较短时间）
      await setCache(cacheKey, emptyData, 600) // 10 分钟

      return NextResponse.json({
        success: true,
        data: emptyData,
        cached: false,
      })
    }

    // 获取所有列表
    const lists = (result as any).lists || []

    // 处理每个列表
    const processedLists = lists.map((list: any) => {
      const products = Array.isArray(list.products)
        ? list.products.filter((product: any) => product && product.status === 'published')
        : []

      return {
        id: list.id,
        title: list.title,
        subtitle: list.subtitle,
        products,
        totalProducts: products.length,
      }
    })

    const responseData = {
      enabled: (result as any).enabled,
      lists: processedLists,
      totalLists: processedLists.length,
    }

    // 缓存结果（1 小时）
    await setCache(cacheKey, responseData, 3600)

    return NextResponse.json({
      success: true,
      data: responseData,
      cached: false,
    })
  } catch (error) {
    console.error('Product recommendations API error:', error)
    return NextResponse.json(
      {
        success: false,
        error: error instanceof Error ? error.message : 'Failed to fetch product recommendations',
      },
      { status: 500 },
    )
  }
}