lbry-desktop/ui/redux/selectors/claims.js

// @flow
import { normalizeURI, parseURI, isURIValid } from 'util/lbryURI';
import { selectSupportsByOutpoint } from 'redux/selectors/wallet';
import { createSelector } from 'reselect';
import { createCachedSelector } from 're-reselect';
import { isClaimNsfw, filterClaims, getChannelIdFromClaim } from 'util/claim';
import * as CLAIM from 'constants/claim';

type State = { claims: any };

const selectState = (state: State) => state.claims || {};

export const selectById = (state: State) => selectState(state).byId || {};
export const selectPendingClaimsById = (state: State) => selectState(state).pendingById || {};

export const selectClaimsById = createSelector(selectById, selectPendingClaimsById, (byId, pendingById) => {
  return Object.assign(byId, pendingById); // do I need merged to keep metadata?
});

export const selectClaimIdsByUri = (state: State) => selectState(state).claimsByUri || {};
export const selectCurrentChannelPage = (state: State) => selectState(state).currentChannelPage || 1;
export const selectCreatingChannel = (state: State) => selectState(state).creatingChannel;
export const selectCreateChannelError = (state: State) => selectState(state).createChannelError;
export const selectRepostLoading = (state: State) => selectState(state).repostLoading;
export const selectRepostError = (state: State) => selectState(state).repostError;

export const selectClaimsByUri = createSelector(selectClaimIdsByUri, selectClaimsById, (byUri, byId) => {
  const claims = {};

  Object.keys(byUri).forEach((uri) => {
    const claimId = byUri[uri];

    // NOTE returning a null claim allows us to differentiate between an
    // undefined (never fetched claim) and one which just doesn't exist. Not
    // the cleanest solution but couldn't think of anything better right now
    if (claimId === null) {
      claims[uri] = null;
    } else {
      claims[uri] = byId[claimId];
    }
  });

  return claims;
});

/**
 * Returns the claim with the specified ID. The claim could be undefined if does
 * not exist or have not fetched. Take note of the second parameter, which means
 * an inline function or helper would be required when used as an input to
 * 'createSelector'.
 *
 * @param state
 * @param claimId
 * @returns {*}
 */
export const selectClaimWithId = (state: State, claimId: string) => {
  const byId = selectClaimsById(state);
  return byId[claimId];
};

export const selectAllClaimsByChannel = createSelector(selectState, (state) => state.paginatedClaimsByChannel || {});

export const selectPendingIds = createSelector(selectState, (state) => Object.keys(state.pendingById) || []);

export const selectPendingClaims = createSelector(selectPendingClaimsById, (pendingById) => Object.values(pendingById));

export const makeSelectClaimIsPending = (uri: string) =>
  createSelector(selectClaimIdsByUri, selectPendingClaimsById, (idsByUri, pendingById) => {
    const claimId = idsByUri[normalizeURI(uri)];

    if (claimId) {
      return Boolean(pendingById[claimId]);
    }
    return false;
  });

export const makeSelectClaimIdIsPending = (claimId: string) =>
  createSelector(selectPendingClaimsById, (pendingById) => {
    return Boolean(pendingById[claimId]);
  });

export const selectClaimIdForUri = (state: State, uri: string) => selectClaimIdsByUri(state)[uri];

export const selectReflectingById = (state: State) => selectState(state).reflectingById;

export const makeSelectClaimForClaimId = (claimId: string) => createSelector(selectClaimsById, (byId) => byId[claimId]);

export const selectClaimForUri = createCachedSelector(
  selectClaimIdsByUri,
  selectClaimsById,
  (state, uri) => uri,
  (state, uri, returnRepost = true) => returnRepost,
  (byUri, byId, uri, returnRepost) => {
    const validUri = isURIValid(uri, false);

    if (validUri && byUri) {
      const normalizedUri = normalizeURI(uri);
      const claimId = uri && byUri[normalizedUri];
      const claim = byId[claimId];

      // Make sure to return the claim as is so apps can check if it's been resolved before (null) or still needs to be resolved (undefined)
      if (claimId === null) {
        return null;
      } else if (claimId === undefined) {
        return undefined;
      }

      const repostedClaim = claim && claim.reposted_claim;
      if (repostedClaim && returnRepost) {
        const channelUrl =
          claim.signing_channel && (claim.signing_channel.canonical_url || claim.signing_channel.permanent_url);

        return {
          ...repostedClaim,
          repost_url: normalizedUri,
          repost_channel_url: channelUrl,
          repost_bid_amount: claim && claim.meta && claim.meta.effective_amount,
        };
      } else {
        return claim;
      }
    }
  }
)((state, uri, returnRepost = true) => `${String(uri)}:${returnRepost ? '1' : '0'}`);

// Note: this is deprecated. Use "selectClaimForUri(state, uri)" instead.
export const makeSelectClaimForUri = (uri: string, returnRepost: boolean = true) =>
  createSelector(selectClaimIdsByUri, selectClaimsById, (byUri, byId) => {
    const validUri = isURIValid(uri, false);

    if (validUri && byUri) {
      const normalizedUri = normalizeURI(uri);
      const claimId = uri && byUri[normalizedUri];
      const claim = byId[claimId];

      // Make sure to return the claim as is so apps can check if it's been resolved before (null) or still needs to be resolved (undefined)
      if (claimId === null) {
        return null;
      } else if (claimId === undefined) {
        return undefined;
      }

      const repostedClaim = claim && claim.reposted_claim;
      if (repostedClaim && returnRepost) {
        const channelUrl =
          claim.signing_channel && (claim.signing_channel.canonical_url || claim.signing_channel.permanent_url);

        return {
          ...repostedClaim,
          repost_url: normalizedUri,
          repost_channel_url: channelUrl,
          repost_bid_amount: claim && claim.meta && claim.meta.effective_amount,
        };
      } else {
        return claim;
      }
    }
  });

// Returns your claim IDs without handling pending and abandoned claims.
export const selectMyClaimIdsRaw = (state: State) => selectState(state).myClaims;

export const selectMyClaimsRaw = createSelector(selectState, selectClaimsById, (state, byId) => {
  const ids = state.myClaims;
  if (!ids) {
    return ids;
  }

  const claims = [];
  ids.forEach((id) => {
    if (byId[id]) {
      // I'm not sure why this check is necessary, but it ought to be a quick fix for https://github.com/lbryio/lbry-desktop/issues/544
      claims.push(byId[id]);
    }
  });
  return claims;
});

export const selectAbandoningById = (state: State) => selectState(state).abandoningById || {};
export const selectAbandoningIds = createSelector(selectAbandoningById, (abandoningById) =>
  Object.keys(abandoningById)
);

export const makeSelectAbandoningClaimById = (claimId: string) =>
  createSelector(selectAbandoningIds, (ids) => ids.includes(claimId));

export const makeSelectIsAbandoningClaimForUri = (uri: string) =>
  createSelector(selectClaimIdsByUri, selectAbandoningIds, (claimIdsByUri, abandoningById) => {
    const claimId = claimIdsByUri[normalizeURI(uri)];
    return abandoningById.indexOf(claimId) >= 0;
  });

export const selectMyActiveClaims = createSelector(
  selectMyClaimIdsRaw,
  selectAbandoningIds,
  (myClaimIds, abandoningIds) => {
    return new Set(myClaimIds && myClaimIds.filter((claimId) => !abandoningIds.includes(claimId)));
  }
);

// Helper for 'selectClaimIsMineForUri'.
// Returns undefined string if unable to normalize or is not valid.
const selectNormalizedAndVerifiedUri = createCachedSelector(
  (state, rawUri) => rawUri,
  (rawUri) => {
    try {
      const uri = normalizeURI(rawUri);
      if (isURIValid(uri, false)) {
        return uri;
      }
    } catch (e) {}

    return undefined;
  }
)((state, rawUri) => String(rawUri));

export const selectClaimIsMine = (state: State, claim: ?Claim) => {
  if (claim) {
    if (claim.is_my_output) {
      return true;
    }

    const signingChannelId = getChannelIdFromClaim(claim);
    const myChannelIds = selectMyChannelClaimIds(state);

    if (signingChannelId && myChannelIds) {
      if (myChannelIds.includes(signingChannelId)) {
        return true;
      }
    } else {
      const myActiveClaims = selectMyActiveClaims(state);
      if (claim.claim_id && myActiveClaims.has(claim.claim_id)) {
        return true;
      }
    }
  }

  return false;
};

export const selectClaimIsMineForUri = (state: State, rawUri: string) => {
  // Not memoizing this selector because:
  // (1) The workload is somewhat lightweight.
  // (2) Since it depends on 'selectClaimsByUri', memoization won't work anyway
  // because the array is constantly invalidated.

  const uri = selectNormalizedAndVerifiedUri(state, rawUri);
  if (!uri) {
    return false;
  }

  const claimsByUri = selectClaimsByUri(state);
  return selectClaimIsMine(state, claimsByUri && claimsByUri[uri]);
};

export const selectMyPurchases = (state: State) => selectState(state).myPurchases;
export const selectPurchaseUriSuccess = (state: State) => selectState(state).purchaseUriSuccess;
export const selectMyPurchasesCount = (state: State) => selectState(state).myPurchasesPageTotalResults;
export const selectIsFetchingMyPurchases = (state: State) => selectState(state).fetchingMyPurchases;
export const selectFetchingMyPurchasesError = (state: State) => selectState(state).fetchingMyPurchasesError;

export const makeSelectMyPurchasesForPage = (query: ?string, page: number = 1) =>
  createSelector(
    selectMyPurchases,
    selectClaimsByUri,
    (myPurchases: Array<string>, claimsByUri: { [string]: Claim }) => {
      if (!myPurchases) {
        return undefined;
      }

      if (!query) {
        // ensure no duplicates from double purchase bugs
        // return [...new Set(myPurchases)];
        return Array.from(new Set(myPurchases));
      }

      const fileInfos = myPurchases.map((uri) => claimsByUri[uri]);
      const matchingFileInfos = filterClaims(fileInfos, query);
      const start = (Number(page) - 1) * Number(CLAIM.PAGE_SIZE);
      const end = Number(page) * Number(CLAIM.PAGE_SIZE);
      return matchingFileInfos && matchingFileInfos.length
        ? matchingFileInfos.slice(start, end).map((fileInfo) => fileInfo.canonical_url || fileInfo.permanent_url)
        : [];
    }
  );

export const makeSelectClaimWasPurchased = (uri: string) =>
  createSelector(makeSelectClaimForUri(uri), (claim) => {
    return claim && claim.purchase_receipt !== undefined;
  });

export const selectAllFetchingChannelClaims = createSelector(selectState, (state) => state.fetchingChannelClaims || {});

export const makeSelectFetchingChannelClaims = (uri: string) =>
  createSelector(selectAllFetchingChannelClaims, (fetching) => fetching && fetching[uri]);

export const makeSelectClaimsInChannelForPage = (uri: string, page?: number) =>
  createSelector(selectClaimsById, selectAllClaimsByChannel, (byId, allClaims) => {
    const byChannel = allClaims[uri] || {};
    const claimIds = byChannel[page || 1];

    if (!claimIds) return claimIds;

    return claimIds.map((claimId) => byId[claimId]);
  });

// THIS IS LEFT OVER FROM ONE TAB CHANNEL_CONTENT
export const makeSelectTotalClaimsInChannelSearch = (uri: string) =>
  createSelector(selectClaimsById, selectAllClaimsByChannel, (byId, allClaims) => {
    const byChannel = allClaims[uri] || {};
    return byChannel['itemCount'];
  });

// THIS IS LEFT OVER FROM ONE_TAB CHANNEL CONTENT
export const makeSelectTotalPagesInChannelSearch = (uri: string) =>
  createSelector(selectClaimsById, selectAllClaimsByChannel, (byId, allClaims) => {
    const byChannel = allClaims[uri] || {};
    return byChannel['pageCount'];
  });

export const selectMetadataForUri = (state: State, uri: string) => {
  const claim = selectClaimForUri(state, uri);
  const metadata = claim && claim.value;
  return metadata || (claim === undefined ? undefined : null);
};

export const makeSelectMetadataForUri = (uri: string) =>
  createSelector(makeSelectClaimForUri(uri), (claim) => {
    const metadata = claim && claim.value;
    return metadata || (claim === undefined ? undefined : null);
  });

export const makeSelectMetadataItemForUri = (uri: string, key: string) =>
  createSelector(makeSelectMetadataForUri(uri), (metadata: ChannelMetadata | StreamMetadata) => {
    return metadata ? metadata[key] : undefined;
  });

export const selectTitleForUri = (state: State, uri: string) => {
  const metadata = selectMetadataForUri(state, uri);
  return metadata && metadata.title;
};

export const selectDateForUri = createCachedSelector(
  selectClaimForUri, // input: (state, uri, ?returnRepost)
  (claim) => {
    const timestamp =
      claim &&
      claim.value &&
      (claim.value.release_time
        ? claim.value.release_time * 1000
        : claim.meta && claim.meta.creation_timestamp
        ? claim.meta.creation_timestamp * 1000
        : null);
    if (!timestamp) {
      return undefined;
    }
    const dateObj = new Date(timestamp);
    return dateObj;
  }
)((state, uri) => String(uri));

export const makeSelectAmountForUri = (uri: string) =>
  createSelector(makeSelectClaimForUri(uri), (claim) => {
    return claim && claim.amount;
  });

export const makeSelectEffectiveAmountForUri = (uri: string) =>
  createSelector(makeSelectClaimForUri(uri, false), (claim) => {
    return (
      claim && claim.meta && typeof claim.meta.effective_amount === 'string' && Number(claim.meta.effective_amount)
    );
  });

export const makeSelectContentTypeForUri = (uri: string) =>
  createSelector(makeSelectClaimForUri(uri), (claim) => {
    const source = claim && claim.value && claim.value.source;
    return source ? source.media_type : undefined;
  });

export const getThumbnailFromClaim = (claim: Claim) => {
  const thumbnail = claim && claim.value && claim.value.thumbnail;
  return thumbnail && thumbnail.url ? thumbnail.url.trim().replace(/^http:\/\//i, 'https://') : undefined;
};

export const selectThumbnailForUri = createCachedSelector(selectClaimForUri, (claim) => {
  return getThumbnailFromClaim(claim);
})((state, uri) => String(uri));

export const makeSelectCoverForUri = (uri: string) =>
  createSelector(makeSelectClaimForUri(uri), (claim) => {
    const cover = claim && claim.value && claim.value.cover;
    return cover && cover.url ? cover.url.trim().replace(/^http:\/\//i, 'https://') : undefined;
  });

export const selectIsFetchingClaimListMine = (state: State) => selectState(state).isFetchingClaimListMine;

export const selectMyClaimsPage = createSelector(selectState, (state) => state.myClaimsPageResults || []);

export const selectMyClaimsPageNumber = createSelector(
  selectState,
  (state) => (state.claimListMinePage && state.claimListMinePage.items) || [],

  (state) => (state.txoPage && state.txoPage.page) || 1
);

export const selectMyClaimsPageItemCount = (state: State) => selectState(state).myClaimsPageTotalResults || 1;
export const selectFetchingMyClaimsPageError = (state: State) => selectState(state).fetchingClaimListMinePageError;

export const selectMyClaims = createSelector(
  selectMyActiveClaims,
  selectClaimsById,
  selectAbandoningIds,
  (myClaimIds, byId, abandoningIds) => {
    const claims = [];

    myClaimIds.forEach((id) => {
      const claim = byId[id];

      if (claim && abandoningIds.indexOf(id) === -1) claims.push(claim);
    });

    return [...claims];
  }
);

export const selectMyClaimsWithoutChannels = createSelector(selectMyClaims, (myClaims) =>
  myClaims.filter((claim) => claim && !claim.name.match(/^@/)).sort((a, b) => a.timestamp - b.timestamp)
);

export const selectMyClaimUrisWithoutChannels = createSelector(selectMyClaimsWithoutChannels, (myClaims) => {
  return myClaims
    .sort((a, b) => {
      if (a.height < 1) {
        return -1;
      } else if (b.height < 1) {
        return 1;
      } else {
        return b.timestamp - a.timestamp;
      }
    })
    .map((claim) => {
      return claim.canonical_url || claim.permanent_url;
    });
});

export const selectAllMyClaimsByOutpoint = createSelector(
  selectMyClaimsRaw,
  (claims) => new Set(claims && claims.length ? claims.map((claim) => `${claim.txid}:${claim.nout}`) : null)
);

export const selectMyClaimsOutpoints = createSelector(selectMyClaims, (myClaims) => {
  const outpoints = [];

  myClaims.forEach((claim) => outpoints.push(`${claim.txid}:${claim.nout}`));

  return outpoints;
});

export const selectFetchingMyChannels = (state: State) => selectState(state).fetchingMyChannels;
export const selectFetchingMyCollections = (state: State) => selectState(state).fetchingMyCollections;

export const selectMyChannelClaimIds = (state: State) => selectState(state).myChannelClaims;

export const selectMyChannelClaims = createSelector(selectMyChannelClaimIds, (myChannelClaimIds) => {
  if (!myChannelClaimIds) {
    return myChannelClaimIds;
  }

  if (!window || !window.store) {
    return undefined;
  }

  // Note: Grabbing the store and running the selector this way is anti-pattern,
  // but it is _needed_ and works only because we know for sure that 'byId[]'
  // will be populated with the same claims as when 'myChannelClaimIds' is populated.
  // If we put 'state' or 'byId' as the input selector, it essentially
  // recalculates every time. Putting 'state' as input to createSelector() is
  // always wrong from a memoization standpoint.
  const state = window.store.getState();
  const byId = selectClaimsById(state);

  const claims = [];
  myChannelClaimIds.forEach((id) => {
    if (byId[id]) {
      // I'm not sure why this check is necessary, but it ought to be a quick fix for https://github.com/lbryio/lbry-desktop/issues/544
      claims.push(byId[id]);
    }
  });

  return claims;
});

export const selectMyChannelUrls = createSelector(selectMyChannelClaims, (claims) =>
  claims ? claims.map((claim) => claim.canonical_url || claim.permanent_url) : undefined
);

export const selectHasChannels = (state: State) => {
  const myChannelClaimIds = selectMyChannelClaimIds(state);
  return myChannelClaimIds ? myChannelClaimIds.length > 0 : false;
};

export const selectMyCollectionIds = (state: State) => selectState(state).myCollectionClaims;

export const selectResolvingUris = createSelector(selectState, (state) => state.resolvingUris || []);

export const selectChannelImportPending = (state: State) => selectState(state).pendingChannelImport;

export const selectIsUriResolving = (state: State, uri: string) => {
  const resolvingUris = selectResolvingUris(state);
  return resolvingUris && resolvingUris.includes(uri);
};

export const selectPlayingUri = (state: State) => selectState(state).playingUri;

export const selectChannelClaimCounts = createSelector(selectState, (state) => state.channelClaimCounts || {});

export const makeSelectPendingClaimForUri = (uri: string) =>
  createSelector(selectPendingClaimsById, (pendingById) => {
    let uriStreamName;
    let uriChannelName;
    try {
      ({ streamName: uriStreamName, channelName: uriChannelName } = parseURI(uri));
    } catch (e) {
      return null;
    }
    const pendingClaims = (Object.values(pendingById): any);
    const matchingClaim = pendingClaims.find((claim: GenericClaim) => {
      return claim.normalized_name === uriChannelName || claim.normalized_name === uriStreamName;
    });
    return matchingClaim || null;
  });

export const makeSelectTotalItemsForChannel = (uri: string) =>
  createSelector(selectChannelClaimCounts, (byUri) => byUri && byUri[normalizeURI(uri)]);

export const makeSelectTotalPagesForChannel = (uri: string, pageSize: number = 10) =>
  createSelector(
    selectChannelClaimCounts,
    (byUri) => byUri && byUri[uri] && Math.ceil(byUri[normalizeURI(uri)] / pageSize)
  );

export const makeSelectNsfwCountFromUris = (uris: Array<string>) =>
  createSelector(selectClaimsByUri, (claims) =>
    uris.reduce((acc, uri) => {
      const claim = claims[uri];
      if (claim && isClaimNsfw(claim)) {
        return acc + 1;
      }
      return acc;
    }, 0)
  );

export const makeSelectOmittedCountForChannel = (uri: string) =>
  createSelector(
    makeSelectTotalItemsForChannel(uri),
    makeSelectTotalClaimsInChannelSearch(uri),
    (claimsInChannel, claimsInSearch) => {
      if (claimsInChannel && typeof claimsInSearch === 'number' && claimsInSearch >= 0) {
        return claimsInChannel - claimsInSearch;
      } else return 0;
    }
  );

export const selectClaimIsNsfwForUri = createCachedSelector(
  selectClaimForUri,
  // Eventually these will come from some list of tags that are considered adult
  // Or possibly come from users settings of what tags they want to hide
  // For now, there is just a hard coded list of tags inside `isClaimNsfw`
  // selectNaughtyTags(),
  (claim: Claim) => {
    return claim ? isClaimNsfw(claim) : false;
  }
)((state, uri) => String(uri));

// Returns the associated channel uri for a given claim uri
// accepts a regular claim uri lbry://something
// returns the channel uri that created this claim lbry://@channel
export const makeSelectChannelForClaimUri = (uri: string, includePrefix: boolean = false) =>
  createSelector(makeSelectClaimForUri(uri), (claim: ?Claim) => {
    if (!claim || !claim.signing_channel || !claim.is_channel_signature_valid) {
      return null;
    }

    const { canonical_url: canonicalUrl, permanent_url: permanentUrl } = claim.signing_channel;

    if (canonicalUrl) {
      return includePrefix ? canonicalUrl : canonicalUrl.slice('lbry://'.length);
    } else {
      return includePrefix ? permanentUrl : permanentUrl.slice('lbry://'.length);
    }
  });

export const makeSelectChannelPermUrlForClaimUri = (uri: string, includePrefix: boolean = false) =>
  createSelector(makeSelectClaimForUri(uri), (claim: ?Claim) => {
    if (claim && claim.value_type === 'channel') {
      return claim.permanent_url;
    }
    if (!claim || !claim.signing_channel || !claim.is_channel_signature_valid) {
      return null;
    }
    return claim.signing_channel.permanent_url;
  });

export const makeSelectMyChannelPermUrlForName = (name: string) =>
  createSelector(selectMyChannelClaims, (claims) => {
    const matchingClaim = claims && claims.find((claim) => claim.name === name);
    return matchingClaim ? matchingClaim.permanent_url : null;
  });

export const selectTagsForUri = createCachedSelector(selectMetadataForUri, (metadata: ?GenericMetadata) => {
  return (metadata && metadata.tags) || [];
})((state, uri) => String(uri));

export const makeSelectTagsForUri = (uri: string) =>
  createSelector(makeSelectMetadataForUri(uri), (metadata: ?GenericMetadata) => {
    return (metadata && metadata.tags) || [];
  });

export const selectFetchingClaimSearchByQuery = (state: State) => selectState(state).fetchingClaimSearchByQuery || {};

export const selectFetchingClaimSearch = createSelector(
  selectFetchingClaimSearchByQuery,
  (fetchingClaimSearchByQuery) => Boolean(Object.keys(fetchingClaimSearchByQuery).length)
);

export const selectClaimSearchByQuery = createSelector(selectState, (state) => state.claimSearchByQuery || {});

export const selectClaimSearchByQueryLastPageReached = createSelector(
  selectState,
  (state) => state.claimSearchByQueryLastPageReached || {}
);

export const selectShortUrlForUri = (state: State, uri: string) => {
  const claim = selectClaimForUri(state, uri);
  return claim && claim.short_url;
};

export const selectCanonicalUrlForUri = (state: State, uri: string) => {
  const claim = selectClaimForUri(state, uri);
  return claim && claim.canonical_url;
};

export const selectPermanentUrlForUri = (state: State, uri: string) => {
  const claim = selectClaimForUri(state, uri);
  return claim && claim.permanent_url;
};

export const makeSelectSupportsForUri = (uri: string) =>
  createSelector(selectSupportsByOutpoint, makeSelectClaimForUri(uri), (byOutpoint, claim: ?StreamClaim) => {
    if (!claim || !claim.is_my_output) {
      return null;
    }

    const { claim_id: claimId } = claim;
    let total = 0;

    Object.values(byOutpoint).forEach((support) => {
      // $FlowFixMe
      const { claim_id, amount } = support;
      total = claim_id === claimId && amount ? total + parseFloat(amount) : total;
    });

    return total;
  });

export const selectUpdatingChannel = (state: State) => selectState(state).updatingChannel;
export const selectUpdateChannelError = (state: State) => selectState(state).updateChannelError;

export const makeSelectReflectingClaimForUri = (uri: string) =>
  createSelector(selectClaimIdsByUri, selectReflectingById, (claimIdsByUri, reflectingById) => {
    const claimId = claimIdsByUri[normalizeURI(uri)];
    return reflectingById[claimId];
  });

export const makeSelectMyStreamUrlsForPage = (page: number = 1) =>
  createSelector(selectMyClaimUrisWithoutChannels, (urls) => {
    const start = (Number(page) - 1) * Number(CLAIM.PAGE_SIZE);
    const end = Number(page) * Number(CLAIM.PAGE_SIZE);

    return urls && urls.length ? urls.slice(start, end) : [];
  });

export const selectMyStreamUrlsCount = createSelector(selectMyClaimUrisWithoutChannels, (channels) => channels.length);

export const makeSelectTagInClaimOrChannelForUri = (uri: string, tag: string) =>
  createSelector(makeSelectClaimForUri(uri), (claim) => {
    const claimTags = (claim && claim.value && claim.value.tags) || [];
    const channelTags =
      (claim && claim.signing_channel && claim.signing_channel.value && claim.signing_channel.value.tags) || [];
    return claimTags.includes(tag) || channelTags.includes(tag);
  });

export const makeSelectClaimHasSource = (uri: string) =>
  createSelector(makeSelectClaimForUri(uri), (claim) => {
    if (!claim) {
      return false;
    }

    return Boolean(claim.value.source);
  });

export const isStreamPlaceholderClaim = (claim: ?StreamClaim) => {
  return claim ? Boolean(claim.value_type === 'stream' && !claim.value.source) : false;
};

export const selectIsStreamPlaceholderForUri = (state: State, uri: string) => {
  const claim = selectClaimForUri(state, uri);
  return isStreamPlaceholderClaim(claim);
};

export const selectTotalStakedAmountForChannelUri = createCachedSelector(selectClaimForUri, (claim) => {
  if (!claim || !claim.amount || !claim.meta || !claim.meta.support_amount) {
    return 0;
  }

  return parseFloat(claim.amount) + parseFloat(claim.meta.support_amount) || 0;
})((state, uri) => String(uri));

export const selectStakedLevelForChannelUri = createCachedSelector(selectTotalStakedAmountForChannelUri, (amount) => {
  let level = 1;
  switch (true) {
    case amount >= CLAIM.LEVEL_2_STAKED_AMOUNT && amount < CLAIM.LEVEL_3_STAKED_AMOUNT:
      level = 2;
      break;
    case amount >= CLAIM.LEVEL_3_STAKED_AMOUNT && amount < CLAIM.LEVEL_4_STAKED_AMOUNT:
      level = 3;
      break;
    case amount >= CLAIM.LEVEL_4_STAKED_AMOUNT && amount < CLAIM.LEVEL_5_STAKED_AMOUNT:
      level = 4;
      break;
    case amount >= CLAIM.LEVEL_5_STAKED_AMOUNT:
      level = 5;
      break;
  }
  return level;
})((state, uri) => String(uri));

export const selectUpdatingCollection = (state: State) => selectState(state).updatingCollection;
export const selectUpdateCollectionError = (state: State) => selectState(state).updateCollectionError;
export const selectCreatingCollection = (state: State) => selectState(state).creatingCollection;
export const selectCreateCollectionError = (state: State) => selectState(state).createCollectionError;