import { beforeEach, describe, expect, it } from "vitest";
import { describeEventTarget, describeTarget, isMeaningfulClickTarget } from "../describe-target";

describe("describeTarget", () => {
  beforeEach(() => {
    document.body.innerHTML = "";
  });

  it("prefers aria-label and button role", () => {
    document.body.innerHTML = `<button aria-label="发布">go</button>`;
    const el = document.querySelector("button")!;
    expect(describeTarget(el)).toEqual({
      tag: "button",
      role: "button",
      name: "发布",
    });
  });

  it("uses label text and name_attr for inputs", () => {
    document.body.innerHTML = `
      <label for="svc">服务名称</label>
      <input id="svc" name="serviceName" />
    `;
    const el = document.querySelector("input")!;
    expect(describeTarget(el)).toEqual({
      tag: "input",
      role: "textbox",
      name: "服务名称",
      name_attr: "serviceName",
    });
  });

  it("never invents CSS selectors or @eN", () => {
    document.body.innerHTML = `<a href="/x">详情</a>`;
    const desc = describeTarget(document.querySelector("a")!);
    expect(JSON.stringify(desc)).not.toMatch(/@e\d+|nth-of-type|#/);
    expect(desc).toEqual({ tag: "a", role: "link", name: "详情" });
  });

  it("prefers heading text inside SERP-style links", () => {
    document.body.innerHTML = `
      <a href="https://www.tencent.com">
        <h3>Tencent 腾讯</h3>
        <cite>https://www.tencent.com</cite>
      </a>
    `;
    expect(describeTarget(document.querySelector("a")!).name).toBe("Tencent 腾讯");
  });
});

describe("LLM textbook click targets", () => {
  beforeEach(() => {
    document.body.innerHTML = "";
  });

  it("rejects tag-only targets the LLM cannot find", () => {
    expect(isMeaningfulClickTarget({ tag: "div" })).toBe(false);
  });

  it("treats a short visible name as the teaching signal", () => {
    expect(isMeaningfulClickTarget({ tag: "div", name: "发布" })).toBe(true);
  });

  it("ignores anonymous layout chrome and lifts child clicks to the named button", () => {
    document.body.innerHTML = `
      <div id="noise">background</div>
      <button type="button"><span id="icon">发布</span></button>
    `;
    expect(describeEventTarget(document.querySelector("#noise"))).toBeNull();
    expect(describeEventTarget(document.querySelector("#icon"))).toEqual({
      tag: "button",
      role: "button",
      name: "发布",
    });
  });

  it("does not attach layout sibling text as nearby_label on buttons", () => {
    document.body.innerHTML = `
      <div>background</div>
      <button type="button" id="pub">发布</button>
    `;
    expect(describeTarget(document.querySelector("#pub")!)).toEqual({
      tag: "button",
      role: "button",
      name: "发布",
    });
  });

  it("keeps nearby_label for form fields from a preceding label-like sibling", () => {
    document.body.innerHTML = `
      <div>服务名称</div>
      <input id="svc" />
    `;
    expect(describeTarget(document.querySelector("#svc")!)).toEqual(
      expect.objectContaining({
        tag: "input",
        nearby_label: "服务名称",
      }),
    );
  });

  it("does not treat plain text blocks as clicks", () => {
    document.body.innerHTML = `<p id="copy">说明文字</p>`;
    expect(describeEventTarget(document.querySelector("#copy"))).toBeNull();
  });

  it("records custom button-like controls by their visible label", () => {
    document.body.innerHTML = `<div class="btn" id="pub" style="cursor: pointer">发布</div>`;
    expect(describeEventTarget(document.querySelector("#pub"))).toEqual(
      expect.objectContaining({ tag: "div", name: "发布" }),
    );
  });
});