// @flow
import { getSearchQueryString } from 'util/query-params';
import { selectShowMatureContent } from 'redux/selectors/settings';
import { SEARCH_OPTIONS } from 'constants/search';
import {
  selectClaimsByUri,
  makeSelectClaimForUri,
  makeSelectClaimForClaimId,
  makeSelectClaimIsNsfw,
  makeSelectPendingClaimForUri,
  makeSelectIsUriResolving,
} from 'redux/selectors/claims';
import { parseURI } from 'util/lbryURI';
import { isClaimNsfw } from 'util/claim';
import { createSelector } from 'reselect';
import { createNormalizedSearchKey, getRecommendationSearchOptions } from 'util/search';
import { selectMutedChannels } from 'redux/selectors/blocked';
import { selectHistory } from 'redux/selectors/content';
import { selectAllCostInfoByUri } from 'lbryinc';

type State = { search: SearchState };

export const selectState = (state: State): SearchState => state.search;

export const selectSearchValue: (state: State) => string = createSelector(selectState, (state) => state.searchQuery);

export const selectSearchOptions: (state: State) => SearchOptions = createSelector(
  selectState,
  (state) => state.options
);

export const selectIsSearching: (state: State) => boolean = createSelector(selectState, (state) => state.searching);

export const selectSearchResultByQuery: (state: State) => { [string]: Array<string> } = createSelector(
  selectState,
  (state) => state.resultsByQuery
);

export const selectHasReachedMaxResultsLength: (state: State) => { [boolean]: Array<boolean> } = createSelector(
  selectState,
  (state) => state.hasReachedMaxResultsLength
);

export const makeSelectSearchUrisForQuery = (query: string): ((state: State) => Array<string>) =>
  createSelector(selectSearchResultByQuery, (byQuery) => {
    if (!query) return;
    // replace statement below is kind of ugly, and repeated in doSearch action
    query = query.replace(/^lbry:\/\//i, '').replace(/\//, ' ');
    const normalizedQuery = createNormalizedSearchKey(query);
    return byQuery[normalizedQuery] && byQuery[normalizedQuery]['uris'];
  });

export const makeSelectHasReachedMaxResultsLength = (query: string): ((state: State) => boolean) =>
  createSelector(selectHasReachedMaxResultsLength, (hasReachedMaxResultsLength) => {
    if (query) {
      query = query.replace(/^lbry:\/\//i, '').replace(/\//, ' ');
      const normalizedQuery = createNormalizedSearchKey(query);
      return hasReachedMaxResultsLength[normalizedQuery];
    }
    return hasReachedMaxResultsLength[query];
  });

export const makeSelectRecommendedContentForUri = (uri: string) =>
  createSelector(
    selectHistory,
    selectClaimsByUri,
    selectShowMatureContent,
    selectMutedChannels,
    selectAllCostInfoByUri,
    selectSearchResultByQuery,
    makeSelectClaimIsNsfw(uri),
    (history, claimsByUri, matureEnabled, blockedChannels, costInfoByUri, searchUrisByQuery, isMature) => {
      const claim = claimsByUri[uri];

      if (!claim) return;

      let recommendedContent;
      // always grab the claimId - this value won't change for filtering
      const currentClaimId = claim.claim_id;

      const { title } = claim.value;

      if (!title) return;

      const options: {
        size: number,
        nsfw?: boolean,
        isBackgroundSearch?: boolean,
      } = { size: 20, nsfw: matureEnabled, isBackgroundSearch: true };

      if (matureEnabled || (!matureEnabled && !isMature)) {
        options[SEARCH_OPTIONS.RELATED_TO] = claim.claim_id;
      }

      const searchQuery = getSearchQueryString(title.replace(/\//, ' '), options);
      const normalizedSearchQuery = createNormalizedSearchKey(searchQuery);

      let searchResult = searchUrisByQuery[normalizedSearchQuery];

      if (searchResult) {
        // Filter from recommended: The same claim and blocked channels
        recommendedContent = searchResult['uris'].filter((searchUri) => {
          const searchClaim = claimsByUri[searchUri];

          if (!searchClaim) return;

          const signingChannel = searchClaim && searchClaim.signing_channel;
          const channelUri = signingChannel && signingChannel.canonical_url;
          const blockedMatch = blockedChannels.some((blockedUri) => blockedUri.includes(channelUri));

          let isEqualUri;
          try {
            const { claimId: searchId } = parseURI(searchUri);
            isEqualUri = searchId === currentClaimId;
          } catch (e) {}

          return !isEqualUri && !blockedMatch;
        });

        // Claim to play next: playable and free claims not played before in history
        const nextUriToPlay = recommendedContent.filter((nextRecommendedUri) => {
          const costInfo = costInfoByUri[nextRecommendedUri] && costInfoByUri[nextRecommendedUri].cost;
          const recommendedClaim = claimsByUri[nextRecommendedUri];
          const isVideo = recommendedClaim && recommendedClaim.value && recommendedClaim.value.stream_type === 'video';
          const isAudio = recommendedClaim && recommendedClaim.value && recommendedClaim.value.stream_type === 'audio';

          let historyMatch = false;
          try {
            const { claimId: nextRecommendedId } = parseURI(nextRecommendedUri);

            historyMatch = history.some(
              (historyItem) =>
                (claimsByUri[historyItem.uri] && claimsByUri[historyItem.uri].claim_id) === nextRecommendedId
            );
          } catch (e) {}

          return !historyMatch && costInfo === 0 && (isVideo || isAudio);
        })[0];

        const index = recommendedContent.indexOf(nextUriToPlay);
        if (index > 0) {
          const a = recommendedContent[0];
          recommendedContent[0] = nextUriToPlay;
          recommendedContent[index] = a;
        }
      }
      return recommendedContent;
    }
  );

export const makeSelectRecommendedRecsysIdForClaimId = (claimId: string) =>
  createSelector(
    makeSelectClaimForClaimId(claimId),
    selectShowMatureContent,
    selectSearchResultByQuery,
    (claim, matureEnabled, searchUrisByQuery) => {
      // TODO: DRY this out.
      let poweredBy;
      if (claim && claimId) {
        const isMature = isClaimNsfw(claim);
        const { title } = claim.value;
        if (!title) {
          return;
        }

        const options = getRecommendationSearchOptions(matureEnabled, isMature, claimId);
        const searchQuery = getSearchQueryString(title.replace(/\//, ' '), options);
        const normalizedSearchQuery = createNormalizedSearchKey(searchQuery);

        const searchResult = searchUrisByQuery[normalizedSearchQuery];
        if (searchResult) {
          poweredBy = searchResult.recsys;
        } else {
          return normalizedSearchQuery;
        }
      }
      return poweredBy;
    }
  );

export const makeSelectWinningUriForQuery = (query: string) => {
  const uriFromQuery = `lbry://${query}`;

  let channelUriFromQuery = '';
  try {
    const { isChannel } = parseURI(uriFromQuery);
    if (!isChannel) {
      channelUriFromQuery = `lbry://@${query}`;
    }
  } catch (e) {}

  return createSelector(
    selectShowMatureContent,
    makeSelectPendingClaimForUri(uriFromQuery),
    makeSelectClaimForUri(uriFromQuery),
    makeSelectClaimForUri(channelUriFromQuery),
    (matureEnabled, pendingClaim, claim1, claim2) => {
      const claim1Mature = claim1 && isClaimNsfw(claim1);
      const claim2Mature = claim2 && isClaimNsfw(claim2);
      let pendingAmount = pendingClaim && pendingClaim.amount;

      if (!claim1 && !claim2) {
        return undefined;
      } else if (!claim1 && claim2) {
        return matureEnabled ? claim2.canonical_url : claim2Mature ? undefined : claim2.canonical_url;
      } else if (claim1 && !claim2) {
        return matureEnabled
          ? claim1.repost_url || claim1.canonical_url
          : claim1Mature
          ? undefined
          : claim1.repost_url || claim1.canonical_url;
      }

      const effectiveAmount1 = claim1 && (claim1.repost_bid_amount || claim1.meta.effective_amount);
      // claim2 will never have a repost_bid_amount because reposts never start with "@"
      const effectiveAmount2 = claim2 && claim2.meta.effective_amount;

      if (!matureEnabled) {
        if (claim1Mature && !claim2Mature) {
          return claim2.canonical_url;
        } else if (claim2Mature && !claim1Mature) {
          return claim1.repost_url || claim1.canonical_url;
        } else if (claim1Mature && claim2Mature) {
          return undefined;
        }
      }

      const returnBeforePending =
        Number(effectiveAmount1) > Number(effectiveAmount2)
          ? claim1.repost_url || claim1.canonical_url
          : claim2.canonical_url;
      if (pendingAmount && pendingAmount > effectiveAmount1 && pendingAmount > effectiveAmount2) {
        return pendingAmount.permanent_url;
      } else {
        return returnBeforePending;
      }
    }
  );
};

export const makeSelectIsResolvingWinningUri = (query: string = '') => {
  const uriFromQuery = `lbry://${query}`;
  let channelUriFromQuery;
  try {
    const { isChannel } = parseURI(uriFromQuery);
    if (!isChannel) {
      channelUriFromQuery = `lbry://@${query}`;
    }
  } catch (e) {}

  return createSelector(
    makeSelectIsUriResolving(uriFromQuery),
    channelUriFromQuery ? makeSelectIsUriResolving(channelUriFromQuery) : () => {},
    (claim1IsResolving, claim2IsResolving) => {
      return claim1IsResolving || claim2IsResolving;
    }
  );
};

export const makeSelectUrlForClaimId = (claimId: string) =>
  createSelector(makeSelectClaimForClaimId(claimId), (claim) =>
    claim ? claim.canonical_url || claim.permanent_url : null
  );