import {
  ProductsListDocument,
  GetNodeDocument,
  NearestOffersDocument
} from '~/composables/graphql/public/geo-generated'
import {
  GetSupplierProfileDocument
} from '~/composables/graphql/public/exchange-generated'

// Shared state
const items = ref<any[]>([])
const isLoading = ref(false)
const isLoadingMore = ref(false)
const isInitialized = ref(false)

// Filter state
const filterSupplierUuid = ref<string | null>(null)
const filterHubUuid = ref<string | null>(null)

export function useCatalogProducts() {
  const { execute } = useGraphQL()

  // Products don't have server-side pagination yet, so we load all at once
  const canLoadMore = computed(() => false)

  const fetchProducts = async () => {
    if (isLoading.value) return
    isLoading.value = true
    try {
      let data

      if (filterSupplierUuid.value) {
        // Products from specific supplier - get supplier coordinates first
        const supplierData = await execute(
          GetSupplierProfileDocument,
          { uuid: filterSupplierUuid.value },
          'public',
          'exchange'
        )
        const supplier = supplierData?.getSupplierProfile

        if (!supplier?.latitude || !supplier?.longitude) {
          console.warn('Supplier has no coordinates')
          items.value = []
        } else {
          // Get offers near supplier and group by product
          const offersData = await execute(
            NearestOffersDocument,
            {
              lat: supplier.latitude,
              lon: supplier.longitude,
              radius: 500
            },
            'public',
            'geo'
          )

          // Group offers by product
          const productsMap = new Map<string, any>()
          offersData?.nearestOffers?.forEach((offer: any) => {
            if (offer?.productUuid) {
              if (!productsMap.has(offer.productUuid)) {
                productsMap.set(offer.productUuid, {
                  uuid: offer.productUuid,
                  name: offer.productName,
                  offersCount: 0
                })
              }
              productsMap.get(offer.productUuid)!.offersCount++
            }
          })
          items.value = Array.from(productsMap.values())
        }
      } else if (filterHubUuid.value) {
        // Products near hub - get hub coordinates first
        const hubData = await execute(
          GetNodeDocument,
          { uuid: filterHubUuid.value },
          'public',
          'geo'
        )
        const hub = hubData?.node

        if (!hub?.latitude || !hub?.longitude) {
          console.warn('Hub has no coordinates')
          items.value = []
        } else {
          // Get offers near hub and group by product
          const offersData = await execute(
            NearestOffersDocument,
            {
              lat: hub.latitude,
              lon: hub.longitude,
              radius: 500
            },
            'public',
            'geo'
          )

          // Group offers by product
          const productsMap = new Map<string, any>()
          offersData?.nearestOffers?.forEach((offer: any) => {
            if (offer?.productUuid) {
              if (!productsMap.has(offer.productUuid)) {
                productsMap.set(offer.productUuid, {
                  uuid: offer.productUuid,
                  name: offer.productName,
                  offersCount: 0
                })
              }
              productsMap.get(offer.productUuid)!.offersCount++
            }
          })
          items.value = Array.from(productsMap.values())
        }
      } else {
        // All products from graph
        data = await execute(
          ProductsListDocument,
          { limit: 500 },
          'public',
          'geo'
        )
        items.value = data?.productsList || []
      }

      isInitialized.value = true
    } finally {
      isLoading.value = false
    }
  }

  const loadMore = async () => {
    // No-op: products don't support pagination yet
  }

  const init = async () => {
    if (!isInitialized.value && items.value.length === 0) {
      await fetchProducts()
    }
  }

  // Filter setters
  const setSupplierFilter = (uuid: string | null) => {
    if (filterSupplierUuid.value !== uuid) {
      filterSupplierUuid.value = uuid
      filterHubUuid.value = null // clear other filter
      isInitialized.value = false
      fetchProducts()
    }
  }

  const setHubFilter = (uuid: string | null) => {
    if (filterHubUuid.value !== uuid) {
      filterHubUuid.value = uuid
      filterSupplierUuid.value = null // clear other filter
      isInitialized.value = false
      fetchProducts()
    }
  }

  const clearFilters = () => {
    if (filterSupplierUuid.value || filterHubUuid.value) {
      filterSupplierUuid.value = null
      filterHubUuid.value = null
      isInitialized.value = false
      fetchProducts()
    }
  }

  // Products don't have coordinates directly (they're an aggregation of offers)
  // Bounds filtering would require a new backend query that filters by offer locations
  // For now, this is a no-op - products show all regardless of map bounds
  const setBoundsFilter = (_bounds: { west: number; south: number; east: number; north: number } | null) => {
    // No-op: products are not filterable by map bounds in current implementation
  }

  return {
    items,
    isLoading,
    isLoadingMore,
    isInitialized,
    canLoadMore,
    fetchProducts,
    loadMore,
    init,
    setSupplierFilter,
    setHubFilter,
    clearFilters,
    setBoundsFilter
  }
}