lbry-desktop/src/renderer/redux/selectors/publish.js

import { createSelector } from 'reselect';
import {
  parseURI,
  selectClaimsById,
  selectMyClaimsWithoutChannels,
  selectResolvingUris,
  buildURI,
  selectClaimsByUri,
} from 'lbry-redux';

const selectState = state => state.publish || {};

export const selectPublishFormValues = createSelector(selectState, state => {
  const { pendingPublish, ...formValues } = state;
  return formValues;
});

// Is the current uri the same as the uri they clicked "edit" on
export const selectIsStillEditing = createSelector(selectPublishFormValues, publishState => {
  const { editingURI, uri } = publishState;

  if (!editingURI || !uri) {
    return false;
  }

  const {
    isChannel: currentIsChannel,
    claimName: currentClaimName,
    contentName: currentContentName,
  } = parseURI(uri);
  const {
    isChannel: editIsChannel,
    claimName: editClaimName,
    contentName: editContentName,
  } = parseURI(editingURI);

  // Depending on the previous/current use of a channel, we need to compare different things
  // ex: going from a channel to anonymous, the new uri won't return contentName, so we need to use claimName
  const currentName = currentIsChannel ? currentContentName : currentClaimName;
  const editName = editIsChannel ? editContentName : editClaimName;
  return currentName === editName;
});

export const selectMyClaimForUri = createSelector(
  selectPublishFormValues,
  selectIsStillEditing,
  selectClaimsById,
  selectMyClaimsWithoutChannels,
  ({ editingURI, uri }, isStillEditing, claimsById, myClaims) => {
    const { contentName, claimName } = parseURI(uri);
    const { claimId: editClaimId } = parseURI(editingURI);

    // If isStillEditing
    // They clicked "edit" from the file page
    // They haven't changed the channel/name after clicking edit
    // Get the claim so they can edit without re-uploading a new file
    return isStillEditing
      ? claimsById[editClaimId]
      : myClaims.find(
          claim =>
            !contentName
              ? claim.name === claimName
              : claim.name === contentName || claim.name === claimName
        );
  }
);

export const selectIsResolvingPublishUris = createSelector(
  selectState,
  selectResolvingUris,
  ({ uri, name }, resolvingUris) => {
    if (uri) {
      const isResolvingUri = resolvingUris.includes(uri);
      const { isChannel } = parseURI(uri);

      let isResolvingShortUri;
      if (isChannel) {
        const shortUri = buildURI({ contentName: name });
        isResolvingShortUri = resolvingUris.includes(shortUri);
      }

      return isResolvingUri || isResolvingShortUri;
    }

    return false;
  }
);

export const selectTakeOverAmount = createSelector(
  selectState,
  selectMyClaimForUri,
  selectClaimsByUri,
  ({ name }, myClaimForUri, claimsByUri) => {
    // We only care about the winning claim for the short uri
    const shortUri = buildURI({ contentName: name });
    const claimForShortUri = claimsByUri[shortUri];

    if (!myClaimForUri && claimForShortUri) {
      return claimForShortUri.effective_amount;
    } else if (myClaimForUri && claimForShortUri) {
      // https://github.com/lbryio/lbry/issues/1476
      // We should check the current effective_amount on my claim to see how much additional lbc
      // is needed to win the claim. Currently this is not possible during a takeover.
      // With this, we could say something like, "You have x lbc in support, if you bid y additional LBC you will control the claim"
      // For now just ignore supports. We will just show the winning claim's bid amount
      return claimForShortUri.effective_amount || claimForShortUri.amount;
    }

    return null;
  }
);