import { GetSupplierProfilesDocument } from '~/composables/graphql/public/exchange-generated'
import { NearestSuppliersDocument } 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 nearestSuppliers with global search
      // (center point 0,0 with very large radius to cover entire globe)
      if (filterProductUuid.value) {
        const data = await execute(
          NearestSuppliersDocument,
          {
            lat: 0,
            lon: 0,
            radius: 20000, // 20000 km radius covers entire Earth
            productUuid: filterProductUuid.value,
            limit: 500 // Increased limit for global search
          },
          'public',
          'geo'
        )
        items.value = data?.nearestSuppliers || []
        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

      // Validate bounds coordinates
      const validBounds = bounds &&
        typeof bounds.west === 'number' && isFinite(bounds.west) &&
        typeof bounds.south === 'number' && isFinite(bounds.south) &&
        typeof bounds.east === 'number' && isFinite(bounds.east) &&
        typeof bounds.north === 'number' && isFinite(bounds.north)

      const fetchLimit = validBounds ? 500 : PAGE_SIZE
      const data = await execute(
        GetSupplierProfilesDocument,
        { limit: fetchLimit, offset: validBounds ? 0 : offset },
        'public',
        'exchange'
      )
      let next = data?.getSupplierProfiles || []

      // Client-side bounds filtering (until exchange backend supports it)
      if (validBounds) {
        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 = validBounds ? 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
  }
}