email compose

frontend/src/utils/composeDraft.js

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+export const DRAFT_KEY_PREFIX = "agmail_draft_";
+
+export function draftStorageKey(windowId) {
+  return `${DRAFT_KEY_PREFIX}${windowId}`;
+}
+
+export function readDraft(windowId) {
+  try {
+    const raw = localStorage.getItem(draftStorageKey(windowId));
+    return raw ? JSON.parse(raw) : null;
+  } catch {
+    return null;
+  }
+}
+
+export function isDraftEmpty(windowId) {
+  const draft = readDraft(windowId);
+  if (!draft) return true;
+  return (
+    !draft.subject
+    && !draft.bodyHtml
+    && !draft.to?.length
+    && !draft.cc?.length
+    && !draft.bcc?.length
+  );
+}
+
+export function draftHasContent(windowId) {
+  return !isDraftEmpty(windowId);
+}
+
+export function draftTitle(windowId) {
+  const draft = readDraft(windowId);
+  if (!draft) return "New message";
+  if (draft.subject?.trim()) return draft.subject.trim();
+  const first = draft.to?.[0];
+  if (first?.name) return first.name;
+  if (first?.email) return first.email.split("@")[0];
+  return "New message";
+}
+
+export function clearDraft(windowId) {
+  localStorage.removeItem(draftStorageKey(windowId));
+}