import { describe, expect, test } from "bun:test";
import {
  createUserMessage,
  createAssistantMessage,
  normalizeMessages,
  extractTag,
} from "../../src/utils/messages";

// ─── Message Structure ────────────────────────────────────────────────

describe("Message pipeline: message structure", () => {
  test("createUserMessage returns a Message with type 'user'", () => {
    const msg = createUserMessage("hello");
    expect(msg.type).toBe("user");
    expect(msg.message.role).toBe("user");
    expect(msg.uuid).toBeTruthy();
    expect(msg.timestamp).toBeTruthy();
  });

  test("createAssistantMessage returns a Message with type 'assistant'", () => {
    const msg = createAssistantMessage("response");
    expect(msg.type).toBe("assistant");
    expect(msg.message.role).toBe("assistant");
    expect(msg.uuid).toBeTruthy();
  });

  test("user and assistant messages have different UUIDs", () => {
    const user = createUserMessage("hello");
    const assistant = createAssistantMessage("response");
    expect(user.uuid).not.toBe(assistant.uuid);
  });
});

// ─── Tag Extraction ───────────────────────────────────────────────────

describe("Message pipeline: tag extraction", () => {
  test("extractTag returns null for non-matching tag", () => {
    expect(extractTag("no tags here", "think")).toBeNull();
  });

  test("extractTag returns null for empty string", () => {
    expect(extractTag("", "think")).toBeNull();
  });

  test("extractTag requires tagName parameter", () => {
    // Calling without tagName throws
    expect(() => (extractTag as any)("hello")).toThrow();
  });
});

// ─── Normalization ────────────────────────────────────────────────────

describe("Message pipeline: normalization", () => {
  test("normalizeMessages returns an array", () => {
    const msg = createUserMessage("hello");
    const result = normalizeMessages([msg]);
    expect(Array.isArray(result)).toBe(true);
  });

  test("normalizeMessages preserves at least one message for simple input", () => {
    const msg = createUserMessage("hello");
    const result = normalizeMessages([msg]);
    expect(result.length).toBeGreaterThanOrEqual(1);
  });
});