import { describe, expect, it } from "vitest";
import { applyReplyThreading } from "./reply-payloads.js";

describe("applyReplyThreading auto-injects replyToCurrent", () => {
  it("sets replyToId to currentMessageId even without [[reply_to_current]] tag", () => {
    const result = applyReplyThreading({
      payloads: [{ text: "Hello" }],
      replyToMode: "first",
      currentMessageId: "42",
    });

    expect(result).toHaveLength(1);
    expect(result[0].replyToId).toBe("42");
  });

  it("threads only first payload when mode is 'first'", () => {
    const result = applyReplyThreading({
      payloads: [{ text: "A" }, { text: "B" }],
      replyToMode: "first",
      currentMessageId: "42",
    });

    expect(result).toHaveLength(2);
    expect(result[0].replyToId).toBe("42");
    expect(result[1].replyToId).toBeUndefined();
  });

  it("threads all payloads when mode is 'all'", () => {
    const result = applyReplyThreading({
      payloads: [{ text: "A" }, { text: "B" }],
      replyToMode: "all",
      currentMessageId: "42",
    });

    expect(result).toHaveLength(2);
    expect(result[0].replyToId).toBe("42");
    expect(result[1].replyToId).toBe("42");
  });

  it("strips replyToId when mode is 'off'", () => {
    const result = applyReplyThreading({
      payloads: [{ text: "A" }],
      replyToMode: "off",
      currentMessageId: "42",
    });

    expect(result).toHaveLength(1);
    expect(result[0].replyToId).toBeUndefined();
  });
});