Prepend reply header ahead of forward header in normalizeMessage

src/telegram/inbound.test.ts

@@ -134,6 +134,77 @@ describe("normalizeMessage", () => {
     );
     expect(r.input?.text).toBe("[Forwarded from Alice]\n(photo attached)");
   });
+
+  it("prepends a reply header when the user replies to a bot message", async () => {
+    const r = await normalizeMessage(
+      {
+        text: "workspace/foo.csv",
+        reply_to_message: { from: { id: 42, is_bot: true }, text: "Which file did you mean?" },
+      },
+      deps({ botUserId: 42 }),
+    );
+    expect(r.input?.text).toBe('[Reply to your message: "Which file did you mean?"]\nworkspace/foo.csv');
+  });
+
+  it("uses 'your own earlier message' when replying to the owner's own message", async () => {
+    const r = await normalizeMessage(
+      {
+        text: "still true",
+        reply_to_message: { from: { id: 99, is_bot: false }, text: "the dog's name is Rex" },
+      },
+      deps({ botUserId: 42 }),
+    );
+    expect(r.input?.text).toBe('[Reply to your own earlier message: "the dog\'s name is Rex"]\nstill true');
+  });
+
+  it("uses the quote wording and text on reply-with-quote", async () => {
+    const r = await normalizeMessage(
+      {
+        text: "what does this mean?",
+        reply_to_message: { from: { id: 42, is_bot: true }, text: "long assistant explanation" },
+        quote: { text: "geothermal power plant" },
+      },
+      deps({ botUserId: 42 }),
+    );
+    expect(r.input?.text).toBe('[Reply quoting your message: "geothermal power plant"]\nwhat does this mean?');
+  });
+
+  it("puts the reply header before the forward header when both are present", async () => {
+    const r = await normalizeMessage(
+      {
+        text: "this one",
+        reply_to_message: { from: { id: 42, is_bot: true }, text: "which article?" },
+        forward_origin: { type: "channel", chat: { title: "Daily News" } },
+      },
+      deps({ botUserId: 42 }),
+    );
+    expect(r.input?.text).toBe('[Reply to your message: "which article?"]\n[Forwarded from Daily News]\nthis one');
+  });
+
+  it("keeps the reply header on a photo-only forwarded reply", async () => {
+    const r = await normalizeMessage(
+      {
+        photo: [{ file_id: "p2", width: 1, height: 1 }],
+        reply_to_message: { from: { id: 42, is_bot: true }, text: "which of these?" },
+        forward_origin: { type: "user", sender_user: { first_name: "Alice" } },
+      },
+      deps({ botUserId: 42 }),
+    );
+    expect(r.input?.text).toBe(
+      '[Reply to your message: "which of these?"]\n[Forwarded from Alice]\n(photo attached)',
+    );
+  });
+
+  it("adds a reply header on a photo-only reply with no body text", async () => {
+    const r = await normalizeMessage(
+      {
+        photo: [{ file_id: "p2", width: 1, height: 1 }],
+        reply_to_message: { from: { id: 42, is_bot: true }, text: "which of these?" },
+      },
+      deps({ botUserId: 42 }),
+    );
+    expect(r.input?.text).toBe('[Reply to your message: "which of these?"]\n(photo attached)');
+  });
 });
 
 describe("saveToInbox", () => {

src/telegram/inbound.ts

@@ -109,6 +109,10 @@ export async function normalizeMessage(msg: InboundMessage, deps: InboundDeps):
     const label = describeForwardOrigin(msg.forward_origin);
     text = text ? `[Forwarded from ${label}]\n${text}` : `[Forwarded from ${label}]`;
   }
+  const replyHeader = buildReplyHeader(msg.reply_to_message, msg.quote, deps.botUserId);
+  if (replyHeader && (text || images.length > 0)) {
+    text = text ? `${replyHeader}\n${text}` : replyHeader;
+  }
   return {
     input: text ? { text, images: images.length > 0 ? images : undefined } : null,
     transcript,