import { defineStore } from 'pinia'
import { computed, ref } from 'vue'

import type { Brand } from '@geo/shared-types'

import { brandsApi } from '@/lib/api'
import {
  clearStoredCurrentBrandId,
  readStoredCurrentBrandId,
  writeStoredCurrentBrandId,
} from '@/lib/current-brand'

export const useCompanyStore = defineStore('company', () => {
  const brands = ref<Brand[]>([])
  const currentBrandId = ref<number | null>(readStoredCurrentBrandId())
  const loading = ref(false)
  const initialized = ref(false)

  const currentBrand = computed(
    () => brands.value.find((brand) => brand.id === currentBrandId.value) ?? null,
  )
  const hasBrands = computed(() => brands.value.length > 0)

  function setCurrentBrand(brandId: number | null): void {
    if (!brandId) {
      currentBrandId.value = null
      clearStoredCurrentBrandId()
      return
    }

    currentBrandId.value = brandId
    writeStoredCurrentBrandId(brandId)
  }

  function normalizeBrandList(value: Brand[] | null | undefined): Brand[] {
    return Array.isArray(value) ? value : []
  }

  function syncCurrentBrand(value: Brand[] | null | undefined): void {
    const nextBrands = normalizeBrandList(value)
    const storedId = readStoredCurrentBrandId()
    const preferredId = currentBrandId.value ?? storedId
    const matched = preferredId ? nextBrands.find((brand) => brand.id === preferredId) : undefined

    if (matched) {
      setCurrentBrand(matched.id)
      return
    }

    if (nextBrands.length > 0) {
      setCurrentBrand(nextBrands[0].id)
      return
    }

    setCurrentBrand(null)
  }

  async function refreshBrands(): Promise<Brand[]> {
    loading.value = true
    try {
      const nextBrands = normalizeBrandList(await brandsApi.list())
      setBrands(nextBrands)
      initialized.value = true
      return nextBrands
    } finally {
      loading.value = false
    }
  }

  function setBrands(value: Brand[] | null | undefined): void {
    const nextBrands = normalizeBrandList(value)
    brands.value = nextBrands
    syncCurrentBrand(nextBrands)
  }

  function reset(): void {
    brands.value = []
    currentBrandId.value = null
    initialized.value = false
    loading.value = false
    clearStoredCurrentBrandId()
  }

  return {
    brands,
    currentBrandId,
    currentBrand,
    hasBrands,
    loading,
    initialized,
    refreshBrands,
    setBrands,
    setCurrentBrand,
    reset,
  }
})