Sending/Failed state for stories

ts/util/resolveStorySendStatus.ts

@@ -0,0 +1,81 @@
+// Copyright 2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { StorySendStateType } from '../types/Stories';
+import { ResolvedSendStatus } from '../types/Stories';
+import { isFailed, isPending, isSent } from '../messages/MessageSendState';
+import { softAssert } from './assert';
+
+export function resolveStorySendStatus(
+  sendStates: Array<StorySendStateType>
+): ResolvedSendStatus {
+  let anyPending = false;
+  let anySent = false;
+  let anyFailed = false;
+
+  sendStates.forEach(({ status }) => {
+    if (isPending(status)) {
+      anyPending = true;
+    }
+
+    if (isSent(status)) {
+      anySent = true;
+    }
+
+    if (isFailed(status)) {
+      anyFailed = true;
+    }
+  });
+
+  if (anyPending) {
+    return ResolvedSendStatus.Sending;
+  }
+
+  if (anyFailed && anySent) {
+    return ResolvedSendStatus.PartiallySent;
+  }
+
+  if (!anyFailed && anySent) {
+    return ResolvedSendStatus.Sent;
+  }
+
+  if (anyFailed && !anySent) {
+    return ResolvedSendStatus.Failed;
+  }
+
+  // Shouldn't get to this case but if none have been sent and none have failed
+  // then let's assume that we've sent.
+  softAssert(
+    anySent && sendStates.length,
+    'resolveStorySendStatus no sends, no failures, nothing pending?'
+  );
+  return ResolvedSendStatus.Sent;
+}
+
+export function reduceStorySendStatus(
+  currentSendStatus: ResolvedSendStatus,
+  nextSendStatus: ResolvedSendStatus
+): ResolvedSendStatus {
+  if (
+    currentSendStatus === ResolvedSendStatus.Sending ||
+    nextSendStatus === ResolvedSendStatus.Sending
+  ) {
+    return ResolvedSendStatus.Sending;
+  }
+
+  if (
+    currentSendStatus === ResolvedSendStatus.Failed ||
+    nextSendStatus === ResolvedSendStatus.Failed
+  ) {
+    return ResolvedSendStatus.Failed;
+  }
+
+  if (
+    currentSendStatus === ResolvedSendStatus.PartiallySent ||
+    nextSendStatus === ResolvedSendStatus.PartiallySent
+  ) {
+    return ResolvedSendStatus.PartiallySent;
+  }
+
+  return ResolvedSendStatus.Sent;
+}