import type {PageFilters} from 'sentry/types/core';
import EventView from 'sentry/utils/discover/eventView';
import type {Sort} from 'sentry/utils/discover/fields';
import {DiscoverDatasets} from 'sentry/utils/discover/types';
import type {MutableSearch} from 'sentry/utils/tokenizeSearch';
import usePageFilters from 'sentry/utils/usePageFilters';
import {useWrappedDiscoverQuery} from 'sentry/views/insights/common/queries/useSpansQuery';
import type {
  EAPSpanProperty,
  EAPSpanResponse,
  MetricsProperty,
  MetricsResponse,
  SpanIndexedProperty,
  SpanIndexedResponse,
  SpanMetricsProperty,
  SpanMetricsResponse,
} from 'sentry/views/insights/types';

interface UseMetricsOptions<Fields> {
  cursor?: string;
  enabled?: boolean;
  fields?: Fields;
  limit?: number;
  noPagination?: boolean;
  pageFilters?: PageFilters;
  search?: MutableSearch | string; // TODO - ideally this probably would be only `Mutable Search`, but it doesn't handle some situations well
  sorts?: Sort[];
}

export const useSpansIndexed = <Fields extends SpanIndexedProperty[]>(
  options: UseMetricsOptions<Fields> = {},
  referrer: string
) => {
  return useDiscover<Fields, SpanIndexedResponse>(
    options,
    DiscoverDatasets.SPANS_INDEXED,
    referrer
  );
};

export const useEAPSpans = <Fields extends EAPSpanProperty[]>(
  options: UseMetricsOptions<Fields> = {},
  referrer: string
) => {
  return useDiscover<Fields, EAPSpanResponse>(
    options,
    DiscoverDatasets.SPANS_EAP,
    referrer
  );
};

export const useSpanMetrics = <Fields extends SpanMetricsProperty[]>(
  options: UseMetricsOptions<Fields> = {},
  referrer: string
) => {
  return useDiscover<Fields, SpanMetricsResponse>(
    options,
    DiscoverDatasets.SPANS_METRICS,
    referrer
  );
};

export const useMetrics = <Fields extends MetricsProperty[]>(
  options: UseMetricsOptions<Fields> = {},
  referrer: string
) => {
  return useDiscover<Fields, MetricsResponse>(
    options,
    DiscoverDatasets.METRICS,
    referrer
  );
};

const useDiscover = <T extends Extract<keyof ResponseType, string>[], ResponseType>(
  options: UseMetricsOptions<T> = {},
  dataset: DiscoverDatasets,
  referrer: string
) => {
  const {
    fields = [],
    search = undefined,
    sorts = [],
    limit,
    cursor,
    pageFilters: pageFiltersFromOptions,
    noPagination,
  } = options;

  const pageFilters = usePageFilters();

  const eventView = getEventView(
    search,
    fields,
    sorts,
    pageFiltersFromOptions ?? pageFilters.selection,
    dataset
  );

  const result = useWrappedDiscoverQuery({
    eventView,
    initialData: [],
    limit,
    enabled: options.enabled,
    referrer,
    cursor,
    noPagination,
  });

  // This type is a little awkward but it explicitly states that the response could be empty. This doesn't enable unchecked access errors, but it at least indicates that it's possible that there's no data
  const data = (result?.data ?? []) as Pick<ResponseType, T[number]>[];

  return {
    ...result,
    data,
    isEnabled: options.enabled,
  };
};

function getEventView(
  search: MutableSearch | string | undefined,
  fields: string[] = [],
  sorts: Sort[] = [],
  pageFilters: PageFilters,
  dataset: DiscoverDatasets
) {
  const query = typeof search === 'string' ? search : search?.formatString() ?? '';

  const eventView = EventView.fromNewQueryWithPageFilters(
    {
      name: '',
      query,
      fields,
      dataset,
      version: 2,
    },
    pageFilters
  );

  if (sorts.length > 0) {
    eventView.sorts = sorts;
  }

  return eventView;
}