import { describe, expect, it } from "vitest";
import {
  normalizeMessageId,
  parseReferencesHeader,
  resolveThreadMeta,
} from "@/services/parse/thread";

describe("thread split", () => {
  it("normalizes message id", () => {
    expect(normalizeMessageId("<a@b.com>")).toBe("a@b.com");
    expect(normalizeMessageId(" a@b.com ")).toBe("a@b.com");
  });

  it("root message is thread root", () => {
    const t = resolveThreadMeta({
      messageId: "<root@x>",
      inReplyTo: null,
      references: null,
    });
    expect(t.isThreadRoot).toBe(true);
    expect(t.threadId).toBe("root@x");
  });

  it("reply uses References leftmost as threadId", () => {
    const t = resolveThreadMeta({
      messageId: "<reply2@x>",
      inReplyTo: "<reply1@x>",
      references: "<root@x> <reply1@x>",
    });
    expect(t.isThreadRoot).toBe(false);
    expect(t.threadId).toBe("root@x");
    expect(t.inReplyTo).toBe("reply1@x");
  });

  it("M4-like: current label does not inherit root NEW by thread alone", () => {
    const current = resolveThreadMeta({
      messageId: "<label@x>",
      inReplyTo: "<new@x>",
      references: "<new@x>",
    });
    expect(current.threadId).toBe("new@x");
    expect(current.isThreadRoot).toBe(false);
    // 类型由 classify(当前 subject) 决定，不由 thread 继承
  });

  it("parseReferencesHeader", () => {
    expect(parseReferencesHeader("<a@x> <b@x>")).toEqual(["a@x", "b@x"]);
  });
});