+// Copyright (C) The Arvados Authors. All rights reserved.
+//
+// SPDX-License-Identifier: AGPL-3.0
+
+import { DataColumn, toggleSortDirection, resetSortDirection } from "../../components/data-table/data-column";
+import actions, { DataExplorerAction } from "./data-explorer-action";
+import { DataTableFilterItem } from "../../components/data-table-filters/data-table-filters";
+
+interface DataExplorer {
+ columns: Array<DataColumn<any>>;
+ items: any[];
+ page: number;
+ rowsPerPage: number;
+}
+
+export const initialDataExplorer: DataExplorer = {
+ columns: [],
+ items: [],
+ page: 0,
+ rowsPerPage: 0
+};
+
+export type DataExplorerState = Record<string, DataExplorer | undefined>;
+
+const dataExplorerReducer = (state: DataExplorerState = {}, action: DataExplorerAction) =>
+ actions.match(action, {
+ SET_COLUMNS: ({ id, columns }) => update(state, id, setColumns(columns)),
+ SET_FILTERS: ({ id, columnName, filters }) => update(state, id, mapColumns(setFilters(columnName, filters))),
+ SET_ITEMS: ({ id, items }) => update(state, id, explorer => ({ ...explorer, items })),
+ SET_PAGE: ({ id, page }) => update(state, id, explorer => ({ ...explorer, page })),
+ SET_ROWS_PER_PAGE: ({ id, rowsPerPage }) => update(state, id, explorer => ({ ...explorer, rowsPerPage })),
+ TOGGLE_SORT: ({ id, columnName }) => update(state, id, mapColumns(toggleSort(columnName))),
+ TOGGLE_COLUMN: ({ id, columnName }) => update(state, id, mapColumns(toggleColumn(columnName))),
+ default: () => state
+ });
+
+export default dataExplorerReducer;
+
+const get = (state: DataExplorerState, id: string) => state[id] || initialDataExplorer;
+
+const update = (state: DataExplorerState, id: string, updateFn: (dataExplorer: DataExplorer) => DataExplorer) =>
+ ({ ...state, [id]: updateFn(get(state, id)) });
+
+const setColumns = (columns: Array<DataColumn<any>>) =>
+ (dataExplorer: DataExplorer) =>
+ ({ ...dataExplorer, columns });
+
+const mapColumns = (mapFn: (column: DataColumn<any>) => DataColumn<any>) =>
+ (dataExplorer: DataExplorer) =>
+ ({ ...dataExplorer, columns: dataExplorer.columns.map(mapFn) });
+
+const toggleSort = (columnName: string) =>
+ (column: DataColumn<any>) => column.name === columnName
+ ? toggleSortDirection(column)
+ : resetSortDirection(column);
+
+const toggleColumn = (columnName: string) =>
+ (column: DataColumn<any>) => column.name === columnName
+ ? { ...column, selected: !column.selected }
+ : column;
+
+const setFilters = (columnName: string, filters: DataTableFilterItem[]) =>
+ (column: DataColumn<any>) => column.name === columnName
+ ? { ...column, filters }
+ : column;