// @vitest-environment happy-dom
import { afterEach, beforeEach, describe, expect, it } from "vitest";

import {
  SHORTCUTS,
  closeHelp,
  installHelpKeybind,
  isHelpOpen,
  isTypingTarget,
  openHelp,
} from "./help.js";

beforeEach(() => {
  installHelpKeybind();
});

afterEach(() => {
  closeHelp();
  document.body.replaceChildren();
});

function press(key: string, init: KeyboardEventInit = {}): void {
  window.dispatchEvent(new KeyboardEvent("keydown", { key, bubbles: true, ...init }));
}

function rows(): string[] {
  return [...document.querySelectorAll(".help-row")].map((r) =>
    [...r.querySelectorAll("kbd")].map((k) => k.textContent).join(" "),
  );
}

describe("help overlay", () => {
  it("renders every registered shortcut, grouped", () => {
    openHelp();
    const groups = [...document.querySelectorAll(".help-group-title")].map((h) => h.textContent);
    expect(groups).toEqual(SHORTCUTS.map((g) => g.title));
    expect(rows()).toEqual(SHORTCUTS.flatMap((g) => g.items.map((s) => s.keys.join(" "))));
    expect(document.querySelectorAll(".help-desc")).toHaveLength(
      SHORTCUTS.reduce((n, g) => n + g.items.length, 0),
    );
  });

  it("opens on ? and closes on a second ?", () => {
    press("?", { shiftKey: true });
    expect(isHelpOpen()).toBe(true);
    press("?", { shiftKey: true });
    expect(isHelpOpen()).toBe(false);
  });

  it("closes on Escape, on the close button, and on a click outside the panel", () => {
    openHelp();
    press("Escape");
    expect(isHelpOpen()).toBe(false);

    openHelp();
    (document.querySelector(".help-close") as HTMLButtonElement).click();
    expect(isHelpOpen()).toBe(false);

    openHelp();
    (document.querySelector(".help-overlay") as HTMLElement).dispatchEvent(
      new MouseEvent("click", { bubbles: true }),
    );
    expect(isHelpOpen()).toBe(false);
  });

  it("stays open for a click inside the panel", () => {
    openHelp();
    (document.querySelector(".help-panel") as HTMLElement).dispatchEvent(
      new MouseEvent("click", { bubbles: true }),
    );
    expect(isHelpOpen()).toBe(true);
  });

  it("opening twice leaves one overlay", () => {
    openHelp();
    openHelp();
    expect(document.querySelectorAll(".help-overlay")).toHaveLength(1);
  });

  it("ignores ? while typing and when a non-shift modifier is held", () => {
    const input = document.createElement("input");
    document.body.appendChild(input);
    input.dispatchEvent(new KeyboardEvent("keydown", { key: "?", bubbles: true, shiftKey: true }));
    expect(isHelpOpen()).toBe(false);

    press("?", { ctrlKey: true });
    expect(isHelpOpen()).toBe(false);
  });

  it("installing the keybind twice still toggles once", () => {
    installHelpKeybind();
    press("?", { shiftKey: true });
    expect(isHelpOpen()).toBe(true);
    expect(document.querySelectorAll(".help-overlay")).toHaveLength(1);
  });
});

describe("isTypingTarget", () => {
  it("is true for form fields and editable nodes, false otherwise", () => {
    const el = (html: string) => {
      const d = document.createElement("div");
      d.innerHTML = html;
      return d.firstElementChild as HTMLElement;
    };
    expect(isTypingTarget(el("<input>"))).toBe(true);
    expect(isTypingTarget(el("<textarea></textarea>"))).toBe(true);
    expect(isTypingTarget(el("<select></select>"))).toBe(true);
    expect(isTypingTarget(el('<div contenteditable="true"></div>'))).toBe(true);
    expect(isTypingTarget(el("<button></button>"))).toBe(false);
    expect(isTypingTarget(null)).toBe(false);
  });
});