feat: make inbound envelopes configurable

Co-authored-by: Shiva Prasad <shiv19@users.noreply.github.com>

src/auto-reply/envelope.test.ts

@@ -1,6 +1,10 @@
 import { describe, expect, it } from "vitest";
 
-import { formatAgentEnvelope, formatInboundEnvelope } from "./envelope.js";
+import {
+  formatAgentEnvelope,
+  formatInboundEnvelope,
+  resolveEnvelopeFormatOptions,
+} from "./envelope.js";
 
 describe("formatAgentEnvelope", () => {
   it("includes channel, from, ip, host, and timestamp", () => {
@@ -38,6 +42,46 @@ describe("formatAgentEnvelope", () => {
     expect(body).toBe("[WebChat 2025-01-02T03:04Z] hello");
   });
 
+  it("formats timestamps in local timezone when configured", () => {
+    const originalTz = process.env.TZ;
+    process.env.TZ = "America/Los_Angeles";
+
+    const ts = Date.UTC(2025, 0, 2, 3, 4); // 2025-01-02T03:04:00Z (19:04 PST)
+    const body = formatAgentEnvelope({
+      channel: "WebChat",
+      timestamp: ts,
+      envelope: { timezone: "local" },
+      body: "hello",
+    });
+
+    process.env.TZ = originalTz;
+
+    expect(body).toMatch(/\[WebChat 2025-01-01 19:04 [^\]]+\] hello/);
+  });
+
+  it("formats timestamps in user timezone when configured", () => {
+    const ts = Date.UTC(2025, 0, 2, 3, 4); // 2025-01-02T03:04:00Z (04:04 CET)
+    const body = formatAgentEnvelope({
+      channel: "WebChat",
+      timestamp: ts,
+      envelope: { timezone: "user", userTimezone: "Europe/Vienna" },
+      body: "hello",
+    });
+
+    expect(body).toMatch(/\[WebChat 2025-01-02 04:04 [^\]]+\] hello/);
+  });
+
+  it("omits timestamps when configured", () => {
+    const ts = Date.UTC(2025, 0, 2, 3, 4);
+    const body = formatAgentEnvelope({
+      channel: "WebChat",
+      timestamp: ts,
+      envelope: { includeTimestamp: false },
+      body: "hello",
+    });
+    expect(body).toBe("[WebChat] hello");
+  });
+
   it("handles missing optional fields", () => {
     const body = formatAgentEnvelope({ channel: "Telegram", body: "hi" });
     expect(body).toBe("[Telegram] hi");
@@ -77,4 +121,53 @@ describe("formatInboundEnvelope", () => {
     });
     expect(body).toBe("[iMessage +1555] hello");
   });
+
+  it("includes elapsed time when previousTimestamp is provided", () => {
+    const now = Date.now();
+    const twoMinutesAgo = now - 2 * 60 * 1000;
+    const body = formatInboundEnvelope({
+      channel: "Telegram",
+      from: "Alice",
+      body: "follow-up message",
+      timestamp: now,
+      previousTimestamp: twoMinutesAgo,
+      chatType: "direct",
+      envelope: { includeTimestamp: false },
+    });
+    expect(body).toContain("Alice +2m");
+    expect(body).toContain("follow-up message");
+  });
+
+  it("omits elapsed time when disabled", () => {
+    const now = Date.now();
+    const body = formatInboundEnvelope({
+      channel: "Telegram",
+      from: "Alice",
+      body: "follow-up message",
+      timestamp: now,
+      previousTimestamp: now - 2 * 60 * 1000,
+      chatType: "direct",
+      envelope: { includeElapsed: false, includeTimestamp: false },
+    });
+    expect(body).toBe("[Telegram Alice] follow-up message");
+  });
+
+  it("resolves envelope options from config", () => {
+    const options = resolveEnvelopeFormatOptions({
+      agents: {
+        defaults: {
+          envelopeTimezone: "user",
+          envelopeTimestamp: "off",
+          envelopeElapsed: "off",
+          userTimezone: "Europe/Vienna",
+        },
+      },
+    });
+    expect(options).toEqual({
+      timezone: "user",
+      includeTimestamp: false,
+      includeElapsed: false,
+      userTimezone: "Europe/Vienna",
+    });
+  });
 });