webapp/app/composables/useCatalogSuppliers.ts

import { GetSupplierProfilesDocument } from '~/composables/graphql/public/exchange-generated'
import { GetSuppliersForProductDocument } from '~/composables/graphql/public/geo-generated'

const PAGE_SIZE = 24

// Shared state across list and map views
const items = ref<any[]>([])
const total = ref(0)
const isLoading = ref(false)
const isLoadingMore = ref(false)
const isInitialized = ref(false)
const filterProductUuid = ref<string | null>(null)
const filterBounds = ref<{ west: number; south: number; east: number; north: number } | null>(null)

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

  const itemsWithCoords = computed(() =>
    items.value.filter(s => s.latitude && s.longitude)
  )

  const canLoadMore = computed(() => items.value.length < total.value)

  const fetchPage = async (offset: number, replace = false) => {
    if (replace) isLoading.value = true
    try {
      // If filtering by product, use specialized query
      if (filterProductUuid.value) {
        const data = await execute(
          GetSuppliersForProductDocument,
          { productUuid: filterProductUuid.value },
          'public',
          'geo'
        )
        const supplierUuids = (data?.suppliersForProduct || []).map(s => s?.uuid).filter(Boolean)
        // Fetch full profiles for these suppliers
        if (supplierUuids.length > 0) {
          const profilesData = await execute(
            GetSupplierProfilesDocument,
            { limit: supplierUuids.length, offset: 0 },
            'public',
            'exchange'
          )
          // Filter to only include suppliers that match the product filter
          const allProfiles = profilesData?.getSupplierProfiles || []
          items.value = allProfiles.filter(p => supplierUuids.includes(p.uuid))
        } else {
          items.value = []
        }
        total.value = items.value.length
        isInitialized.value = true
        return
      }

      // Default: fetch all suppliers
      // If bounds filter is active, fetch more and filter client-side
      // TODO: Add bounds support to exchange backend for proper server-side filtering
      const bounds = filterBounds.value
      const fetchLimit = bounds ? 500 : PAGE_SIZE
      const data = await execute(
        GetSupplierProfilesDocument,
        { limit: fetchLimit, offset: bounds ? 0 : offset },
        'public',
        'exchange'
      )
      let next = data?.getSupplierProfiles || []

      // Client-side bounds filtering (until exchange backend supports it)
      if (bounds) {
        next = next.filter((s: any) => {
          if (!s.latitude || !s.longitude) return false
          const lat = Number(s.latitude)
          const lng = Number(s.longitude)
          return lat >= bounds.south && lat <= bounds.north
              && lng >= bounds.west && lng <= bounds.east
        })
      }

      items.value = replace ? next : items.value.concat(next)
      total.value = bounds ? next.length : (data?.getSupplierProfilesCount ?? total.value)
      isInitialized.value = true
    } finally {
      isLoading.value = false
    }
  }

  const loadMore = async () => {
    if (isLoadingMore.value) return
    isLoadingMore.value = true
    try {
      await fetchPage(items.value.length)
    } finally {
      isLoadingMore.value = false
    }
  }

  // Initialize data if not already loaded
  const init = async () => {
    if (!isInitialized.value && items.value.length === 0) {
      await fetchPage(0, true)
    }
  }

  const setProductFilter = (uuid: string | null) => {
    if (filterProductUuid.value === uuid) return // Early return if unchanged
    filterProductUuid.value = uuid
    if (isInitialized.value) {
      fetchPage(0, true)
    }
  }

  const setBoundsFilter = (bounds: { west: number; south: number; east: number; north: number } | null) => {
    filterBounds.value = bounds
    if (isInitialized.value) {
      fetchPage(0, true)
    }
  }

  return {
    items,
    total,
    isLoading,
    isLoadingMore,
    itemsWithCoords,
    canLoadMore,
    fetchPage,
    loadMore,
    init,
    setProductFilter,
    setBoundsFilter
  }
}