feat: change range offer to use date range

add date range type
change availability filter

src/things/abstract/range.ts

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2021 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {SCISO8601Date} from '../../general/time';
+
+/**
+ * Date Range
+ *
+ * CAUTION: Changing the name requires changes in the core-tools premaps
+ */
+export type SCISO8601DateRange = SCRange<SCISO8601Date>;
+
+/**
+ * Generic range type
+ */
+export type SCRange<T> = {
+  /**
+   * Greater than value
+   */
+  gt?: never;
+
+  /**
+   * Greater or equal to value
+   */
+  gte?: T;
+
+  /**
+   * Greater than value
+   */
+  lt?: never;
+
+  /**
+   * Greater or equal to value
+   */
+  lte?: T;
+} | {
+  // tslint:disable:completed-docs
+  gt?: T;
+  gte?: never;
+  lt?: T;
+  lte?: never;
+} | {
+  gt?: T;
+  gte?: never;
+  lt?: never;
+  lte?: T;
+} | {
+  gt?: never;
+  gte?: T;
+  lt?: T;
+  lte?: never;
+  // tslint:enable:completed-docs
+};