import { ref, computed } from 'vue'
import type { Province } from '~/models/province'
import type { SelectItem } from '~/components/pub/my-ui/form/select.vue'
import { toTitleCase } from '~/lib/utils'
import * as provinceService from '~/services/province.service'

// Global state untuk caching
const provincesCache = ref<Province[]>([])
const isLoading = ref(false)
const isInitialized = ref(false)
const error = ref<string | null>(null)

export function useProvinces() {
  // Computed untuk format SelectItem
  const provinceOptions = computed<SelectItem[]>(() => {
    return provincesCache.value.map((province) => ({
      label: toTitleCase(province.name),
      value: province.code,
      // code: province.code,
      searchValue: `${province.code} ${province.name}`.trim(), // Untuk search internal combobox
    }))
  })

  // Function untuk fetch data provinces
  async function fetchProvinces(forceRefresh = false) {
    // Jika sudah ada data dan tidak force refresh, skip
    if (isInitialized.value && !forceRefresh) {
      return
    }

    // Jika sedang loading, skip untuk mencegah duplicate calls
    if (isLoading.value) {
      return
    }

    isLoading.value = true
    error.value = null

    try {
      const response = await provinceService.getList({
        'page-no-limit': true,
        sort: 'name:asc',
      })

      if (response.success) {
        provincesCache.value = response.body.data || []
        isInitialized.value = true
      } else {
        error.value = 'Gagal memuat data provinsi'
        console.error('Failed to fetch provinces:', response)
      }
    } catch (err) {
      error.value = 'Terjadi kesalahan saat memuat data provinsi'
      console.error('Error fetching provinces:', err)
    } finally {
      isLoading.value = false
    }
  }

  // Function untuk mencari province berdasarkan code
  function getProvinceByCode(code: string): Province | undefined {
    return provincesCache.value.find((province) => province.code === code)
  }

  // Function untuk mencari province berdasarkan name
  function getProvinceByName(name: string): Province | undefined {
    return provincesCache.value.find((province) => province.name.toLowerCase() === name.toLowerCase())
  }

  // Function untuk clear cache (jika diperlukan)
  function clearCache() {
    provincesCache.value = []
    isInitialized.value = false
    error.value = null
  }

  // Function untuk refresh data
  function refreshProvinces() {
    return fetchProvinces(true)
  }

  // Auto fetch saat composable pertama kali digunakan
  if (!isInitialized.value && !isLoading.value) {
    fetchProvinces()
  }

  return {
    // Data
    provinces: readonly(provincesCache),
    provinceOptions,

    // State
    isLoading: readonly(isLoading),
    isInitialized: readonly(isInitialized),
    error: readonly(error),

    // Methods
    fetchProvinces,
    refreshProvinces,
    getProvinceByCode,
    getProvinceByName,
    clearCache,
  }
}

// Export untuk direct access ke cached data (jika diperlukan)
export const useProvincesCache = () => ({
  provinces: readonly(provincesCache),
  isLoading: readonly(isLoading),
  isInitialized: readonly(isInitialized),
})