refactor(collections): refactor collection search to match monorepo

app/collections/collection-search.cjsx

@@ -2,7 +2,7 @@ React = require 'react'
 PropTypes = require 'prop-types'
 createReactClass = require 'create-react-class'
 Select = require('react-select').default
-apiClient = require 'panoptes-client/lib/api-client'
+{ collectionsSearch } = require('./searchCollections')
 
 module.exports = createReactClass
   displayName: 'CollectionSearch'
@@ -30,13 +30,7 @@ module.exports = createReactClass
     )
 
   searchCollections: (value) ->
-    query =
-      page_size: 100
-      favorite: false
-      current_user_roles: 'owner,collaborator,contributor'
-    query.search = "#{value}" unless value is ''
-
-    apiClient.type('collections').get query
+    collectionsSearch(value)
       .then (collections) =>
         options = collections.map (collection) =>
           {

app/collections/searchCollections.js

@@ -0,0 +1,40 @@
+import apiClient from 'panoptes-client/lib/api-client';
+
+// Tune this value to determine when a search term is long enough to use Panoptes full-text search.
+const MIN_SEARCH_LENGTH = 3;
+
+/**
+ * Query the Panoptes collections search API
+ * @param {string} text - The search term.
+ * @returns {Promise<Array>} - A promise that resolves to an array of collections.
+ */
+function panoptesCollectionsSearch(text) {
+  const query = {
+    page_size: 100,
+    favorite: false,
+    current_user_roles: 'owner,collaborator,contributor'
+  };
+  if (text) {
+    query.search = text;
+  }
+  return apiClient.type('collections').get(query);
+}
+
+/**
+ * Search Panoptes collections by name. Use full-text search for long search terms.
+ * Otherwise, request all collections and filter by name.
+ * @param {string} text - The search term.
+ * @returns {Promise<Array>} - A promise that resolves to an array of collections.
+ */
+export async function collectionsSearch(text = '') {
+  const search = text.trim().toLowerCase();
+  // Search terms of more than MIN_SEARCH_LENGTH characters can use Panoptes full-text search.
+  if (search.length > MIN_SEARCH_LENGTH) {
+    return panoptesCollectionsSearch(search);
+  }
+  // Otherwise, filter all your collection names by the search term.
+  const allCollections = await panoptesCollectionsSearch();
+  return allCollections.filter(
+    collection => collection.display_name.toLowerCase().includes(search)
+  );
+}