import type { Network } from "@saberhq/solana-contrib";
import type { ProgramAccount } from "@saberhq/token-utils";
import { useSolana } from "@saberhq/use-solana";
import type { PublicKey } from "@solana/web3.js";
import { useEffect } from "react";
import type { UseQueryOptions, UseQueryResult } from "react-query";
import { useQuery } from "react-query";

import type { FetchKeysFn } from "..";
import {
  fetchKeysMaybe,
  SailProgramAccountParseError,
  serializeKeys,
  useAccountsSubscribe,
} from "..";
import { useSail } from "../provider";
import type { ProgramAccountParser } from "./programAccounts";

/**
 * Result of a parsed account query.
 */
export type BatchParsedAccountQueryResult<T> = UseQueryResult<
  BatchedParsedAccountQueryData<T>
>;

/**
 * Data resulting from a batch query.
 */
export type BatchedParsedAccountQueryKeys =
  | readonly (PublicKey | null | undefined)[]
  | null
  | undefined;

/**
 * Data resulting from a batch query.
 */
export type BatchedParsedAccountQueryData<T> =
  | readonly (ProgramAccount<T> | null | undefined)[]
  | null
  | undefined;

export const makeBatchedParsedAccountQuery = <T>(
  keys: BatchedParsedAccountQueryKeys,
  network: Network,
  fetchKeys: FetchKeysFn,
  parser: ProgramAccountParser<T>,
  options: Omit<
    UseQueryOptions<BatchedParsedAccountQueryData<T>>,
    "queryFn" | "queryKey"
  > = {}
): UseQueryOptions<BatchedParsedAccountQueryData<T>> => ({
  queryKey: [
    "sail/batchedParsedAccounts",
    network,
    ...(keys ? serializeKeys(keys) : keys === null ? ["null"] : ["undefined"]),
  ],
  queryFn: async (): Promise<BatchedParsedAccountQueryData<T>> => {
    if (!keys) {
      return keys;
    }
    const accountsData = await fetchKeysMaybe(fetchKeys, keys);
    return accountsData.map((result): ProgramAccount<T> | null | undefined => {
      if (!result) {
        return result;
      }
      const data = result.data;
      if (!data) {
        return null;
      }

      try {
        const parsed = parser.parse(data.accountInfo.data);
        return {
          publicKey: data.accountId,
          account: parsed,
        };
      } catch (e) {
        throw new SailProgramAccountParseError(e, data, parser);
      }
    });
  },
  staleTime: Infinity,
  ...options,
});

/**
 * Parses accounts with the given parser, fetching them in batch.
 *
 * @param keys
 * @param parser
 * @returns
 */
export const useBatchedParsedAccounts = <T>(
  keys: BatchedParsedAccountQueryKeys,
  parser: ProgramAccountParser<T>,
  options: Omit<
    UseQueryOptions<BatchedParsedAccountQueryData<T>>,
    "queryFn" | "queryKey"
  > = {}
): BatchParsedAccountQueryResult<T> => {
  const { fetchKeys, onBatchCache } = useSail();
  const { network } = useSolana();

  const query = useQuery(
    makeBatchedParsedAccountQuery(keys, network, fetchKeys, parser, options)
  );

  useAccountsSubscribe(keys);

  // refresh from the cache whenever the cache is updated
  const { refetch } = query;
  useEffect(() => {
    if (!keys) {
      return;
    }
    return onBatchCache((e) => {
      if (keys.find((key) => key && e.hasKey(key))) {
        void refetch();
      }
    });
  }, [keys, fetchKeys, onBatchCache, refetch]);

  return query;
};