New: Project Aphrodite

frontend/src/Store/Selectors/createClientSideCollectionSelector.js

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+import _ from 'lodash';
+import { createSelector } from 'reselect';
+import findSelectedFilters from 'Utilities/Filter/findSelectedFilters';
+import { filterTypePredicates, filterTypes, sortDirections } from 'Helpers/Props';
+
+function getSortClause(sortKey, sortDirection, sortPredicates) {
+  if (sortPredicates && sortPredicates.hasOwnProperty(sortKey)) {
+    return function(item) {
+      return sortPredicates[sortKey](item, sortDirection);
+    };
+  }
+
+  return function(item) {
+    return item[sortKey];
+  };
+}
+
+function filter(items, state) {
+  const {
+    selectedFilterKey,
+    filters,
+    customFilters,
+    filterPredicates
+  } = state;
+
+  if (!selectedFilterKey) {
+    return items;
+  }
+
+  const selectedFilters = findSelectedFilters(selectedFilterKey, filters, customFilters);
+
+  return _.filter(items, (item) => {
+    let i = 0;
+    let accepted = true;
+
+    while (accepted && i < selectedFilters.length) {
+      const {
+        key,
+        value,
+        type = filterTypes.EQUAL
+      } = selectedFilters[i];
+
+      if (filterPredicates && filterPredicates.hasOwnProperty(key)) {
+        const predicate = filterPredicates[key];
+
+        if (Array.isArray(value)) {
+          accepted = value.some((v) => predicate(item, v, type));
+        } else {
+          accepted = predicate(item, value, type);
+        }
+      } else if (item.hasOwnProperty(key)) {
+        const predicate = filterTypePredicates[type];
+
+        if (Array.isArray(value)) {
+          if (
+            type === filterTypes.NOT_CONTAINS ||
+            type === filterTypes.NOT_EQUAL
+          ) {
+            accepted = value.every((v) => predicate(item[key], v));
+          } else {
+            accepted = value.some((v) => predicate(item[key], v));
+          }
+        } else {
+          accepted = predicate(item[key], value);
+        }
+      } else {
+        // Default to false if the filter can't be tested
+        accepted = false;
+      }
+
+      i++;
+    }
+
+    return accepted;
+  });
+}
+
+function sort(items, state) {
+  const {
+    sortKey,
+    sortDirection,
+    sortPredicates,
+    secondarySortKey,
+    secondarySortDirection
+  } = state;
+
+  const clauses = [];
+  const orders = [];
+
+  clauses.push(getSortClause(sortKey, sortDirection, sortPredicates));
+  orders.push(sortDirection === sortDirections.ASCENDING ? 'asc' : 'desc');
+
+  if (secondarySortKey &&
+      secondarySortDirection &&
+      (sortKey !== secondarySortKey ||
+       sortDirection !== secondarySortDirection)) {
+    clauses.push(getSortClause(secondarySortKey, secondarySortDirection, sortPredicates));
+    orders.push(secondarySortDirection === sortDirections.ASCENDING ? 'asc' : 'desc');
+  }
+
+  return _.orderBy(items, clauses, orders);
+}
+
+function createCustomFiltersSelector(type, alternateType) {
+  return createSelector(
+    (state) => state.customFilters.items,
+    (customFilters) => {
+      return customFilters.filter((customFilter) => {
+        return customFilter.type === type || customFilter.type === alternateType;
+      });
+    }
+  );
+}
+
+function createClientSideCollectionSelector(section, uiSection) {
+  return createSelector(
+    (state) => _.get(state, section),
+    (state) => _.get(state, uiSection),
+    createCustomFiltersSelector(section, uiSection),
+    (sectionState, uiSectionState = {}, customFilters) => {
+      const state = Object.assign({}, sectionState, uiSectionState, { customFilters });
+
+      const filtered = filter(state.items, state);
+      const sorted = sort(filtered, state);
+
+      return {
+        ...sectionState,
+        ...uiSectionState,
+        customFilters,
+        items: sorted,
+        totalItems: state.items.length
+      };
+    }
+  );
+}
+
+export default createClientSideCollectionSelector;