import type { PersistQueryClientProviderProps } from '@tanstack/react-query-persist-client'

import { QueryClient } from '@tanstack/react-query'
import { createSyncStoragePersister } from '@tanstack/query-sync-storage-persister'

const DEFAULT_STALE_TIME_MS = 30_000
const DEFAULT_GC_TIME_MS = 5 * 60_000

export const makeQueryClient = () =>
  new QueryClient({
    defaultOptions: {
      queries: {
        staleTime: DEFAULT_STALE_TIME_MS,
        gcTime: DEFAULT_GC_TIME_MS,
        refetchOnWindowFocus: true,
        refetchOnReconnect: true,
        retry: 1,
      },
    },
  })

let browserQueryClient: QueryClient | undefined

/** Browser singleton so layout remounts share one cache. */
export const getQueryClient = () => {
  if (typeof window === 'undefined') {
    return makeQueryClient()
  }

  browserQueryClient ??= makeQueryClient()

  return browserQueryClient
}

const PERSIST_STORAGE_KEY = 'ghabilee-admin-query-cache-v1'
const LEGACY_PERSIST_STORAGE_KEY = 'ghabilee-query-cache-v2'
const PERSIST_MAX_AGE_MS = 24 * 60 * 60_000

/** Inert stand-in for `window.localStorage` during SSR. */
const noopStorage: Storage = {
  length: 0,
  clear() {
    /* SSR inert storage */
  },
  getItem: () => null,
  key: () => null,
  removeItem() {
    /* SSR inert storage */
  },
  setItem() {
    /* SSR inert storage */
  },
}

const removeStorageKey = (key: string) => {
  if (typeof window === 'undefined') return

  try {
    window.localStorage.removeItem(key)
  } catch {
    // Persistence is optional; blocked storage must not break the app.
  }
}

let didRemoveLegacyPersistedCache = false

const removeLegacyPersistedCache = () => {
  if (didRemoveLegacyPersistedCache || typeof window === 'undefined') return

  removeStorageKey(LEGACY_PERSIST_STORAGE_KEY)
  removeStorageKey('ghabilee-query-cache')
  didRemoveLegacyPersistedCache = true
}

/** Remove persisted query state synchronously before ending a user session. */
export const clearPersistedQueryCache = () => {
  removeStorageKey(PERSIST_STORAGE_KEY)
  removeStorageKey(LEGACY_PERSIST_STORAGE_KEY)
  removeStorageKey('ghabilee-query-cache')
}

/**
 * Admin does not persist discovery/home-feed caches. Provider shape stays
 * stable for hydration; dehydrate always returns false.
 */
export const getQueryPersistOptions = (): PersistQueryClientProviderProps['persistOptions'] => {
  removeLegacyPersistedCache()

  return {
    // eslint-disable-next-line @typescript-eslint/no-deprecated -- sync persister intentional for localStorage
    persister: createSyncStoragePersister({
      storage: typeof window === 'undefined' ? noopStorage : window.localStorage,
      key: PERSIST_STORAGE_KEY,
    }),
    maxAge: PERSIST_MAX_AGE_MS,
    buster: process.env.NEXT_PUBLIC_APP_VERSION ?? '',
    dehydrateOptions: {
      shouldDehydrateQuery: () => false,
    },
  }
}