import { App, Component, useRef, xml } from "../../src";
import { status } from "../../src/runtime/status";
import { makeTestFixture, snapshotEverything } from "../helpers";

let fixture: HTMLElement;

snapshotEverything();

beforeEach(() => {
  fixture = makeTestFixture();
});

describe("shadow_dom", () => {
  test("can mount app", async () => {
    class SomeComponent extends Component {
      static template = xml`<div class="my-div"/>`;
    }

    const container = document.createElement("div");
    fixture.appendChild(container);
    const shadow = container.attachShadow({ mode: "open" });
    const app = new App(SomeComponent);
    const comp = await app.mount(shadow);
    const div = shadow.querySelector(".my-div");
    expect(div).not.toBe(null);
    expect(shadow.contains(div)).toBe(true);
    app.destroy();
    expect(shadow.contains(div)).toBe(false);
    expect(status(comp)).toBe("destroyed");
  });

  test("can mount app in closed shadow dom", async () => {
    class SomeComponent extends Component {
      static template = xml`<div class="my-div"/>`;
    }

    const container = document.createElement("div");
    fixture.appendChild(container);
    const shadow = container.attachShadow({ mode: "closed" });
    const app = new App(SomeComponent);
    const comp = await app.mount(shadow);
    const div = shadow.querySelector(".my-div");
    expect(div).not.toBe(null);
    expect(shadow.contains(div)).toBe(true);
    app.destroy();
    expect(shadow.contains(div)).toBe(false);
    expect(status(comp)).toBe("destroyed");
  });

  test("can bind event handler", async () => {
    let a = 1;
    class SomeComponent extends Component {
      static template = xml`<button t-on-click="add">Click</button>`;

      add() {
        a = 3;
      }
    }
    const container = document.createElement("div");
    fixture.appendChild(container);
    const shadow = container.attachShadow({ mode: "open" });
    await new App(SomeComponent).mount(shadow);
    expect(a).toBe(1);
    shadow.querySelector("button")!.click();
    expect(a).toBe(3);
  });

  test("useRef hook", async () => {
    let comp: SomeComponent;
    class SomeComponent extends Component {
      static template = xml`<div t-ref="refName" class="my-div"/>`;
      div = useRef("refName");
      setup() {
        comp = this;
      }
    }
    const container = document.createElement("div");
    fixture.appendChild(container);
    const shadow = container.attachShadow({ mode: "open" });
    const mountedProm = new App(SomeComponent).mount(shadow);
    expect(comp!.div.el).toBe(null);
    await mountedProm;
    expect(comp!.div.el).toBe(shadow.querySelector(".my-div"));
  });

  test("can mount app inside a shadow child element", async () => {
    class SomeComponent extends Component {
      static template = xml`<div class="my-div"/>`;
    }
    const shadow = fixture.attachShadow({ mode: "open" });
    const shadowDiv = document.createElement("div");
    shadow.append(shadowDiv);
    const app = new App(SomeComponent);
    const comp = await app.mount(shadowDiv);
    const div = shadow.querySelector(".my-div");
    expect(div).not.toBe(null);
    expect(shadow.contains(div)).toBe(true);
    app.destroy();
    expect(shadow.contains(div)).toBe(false);
    expect(status(comp)).toBe("destroyed");
  });

  test("can mount app inside a separate HTML document", async () => {
    class SomeComponent extends Component {
      static template = xml`<div class="my-div"/>`;
    }

    const separateDoc = document.implementation.createHTMLDocument();
    const container = separateDoc.createElement("div");
    separateDoc.body.appendChild(container);

    const app = new App(SomeComponent);
    let error: Error;
    try {
      await app.mount(container);
    } catch (e) {
      error = e as Error;
    }
    expect(error!).toBeDefined();
    expect(error!.message).toBe(
      "Cannot mount a component: the target document is not attached to a window (defaultView is missing)"
    );
  });

  test("can mount app inside an element in a shadow root inside an iframe", async () => {
    class SomeComponent extends Component {
      static template = xml`<div class="my-div"/>`;
    }

    const iframe = document.createElement("iframe");
    fixture.appendChild(iframe);

    const iframeDoc = iframe.contentDocument!;
    const container = iframeDoc.createElement("div");
    iframeDoc.body.appendChild(container);

    const shadow = container.attachShadow({ mode: "open" });

    const shadowTarget = iframeDoc.createElement("div");
    shadow.appendChild(shadowTarget);

    const app = new App(SomeComponent);
    const comp = await app.mount(shadowTarget);

    const div = shadow.querySelector(".my-div");
    expect(div).not.toBe(null);
    expect(shadow.contains(div)).toBe(true);
    expect(iframeDoc.body.contains(container)).toBe(true);

    app.destroy();
    expect(shadow.contains(div)).toBe(false);
    expect(status(comp)).toBe("destroyed");
  });
});