import { act } from "react";
import { createRoot, type Root } from "react-dom/client";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import {
  Badge,
  Button,
  Checkbox,
  Dialog,
  EkklesiaUiStyles,
  EmptyState,
  ErrorState,
  Field,
  IconButton,
  List,
  ListItem,
  LoadingState,
  Panel,
  Select,
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableRow,
  Tabs,
  TextInput,
  Toast,
  ToastStack,
} from "../src/index.js";

declare global {
  // eslint-disable-next-line no-var
  var IS_REACT_ACT_ENVIRONMENT: boolean | undefined;
}

let container: HTMLDivElement;
let root: Root;

beforeEach(() => {
  globalThis.IS_REACT_ACT_ENVIRONMENT = true;
  container = document.createElement("div");
  document.body.appendChild(container);
  root = createRoot(container);
});

afterEach(() => {
  act(() => root.unmount());
  container.remove();
});

function render(node: React.ReactNode): void {
  act(() => root.render(node));
}

describe("Ekklesia elements", () => {
  it("renders a button that does not submit a form by accident", () => {
    render(<Button variant="primary">Save</Button>);
    const button = container.querySelector("button");

    expect(button?.getAttribute("type")).toBe("button");
    expect(button?.className).toContain("ek-button--primary");
    expect(button?.className).toContain("ek-focusable");
  });

  it("requires an accessible name on an icon-only button", () => {
    render(<IconButton label="Remove slide">×</IconButton>);

    expect(container.querySelector("button")?.getAttribute("aria-label")).toBe("Remove slide");
  });

  it("associates a field's label, hint, and error with its control", () => {
    render(
      <Field error="Enter a name." hint="Shown on the display." label="Name">
        {(control) => <TextInput {...control} />}
      </Field>,
    );

    const label = container.querySelector("label");
    const input = container.querySelector("input");
    const error = container.querySelector(".ek-field__error");

    expect(input?.id).toBeTruthy();
    expect(label?.getAttribute("for")).toBe(input?.id);
    expect(input?.getAttribute("aria-invalid")).toBe("true");
    expect(input?.getAttribute("aria-describedby")?.split(" ")).toContain(error?.id);
    expect(error?.getAttribute("role")).toBe("alert");
  });

  it("renders a select and a labelled checkbox as real form controls", () => {
    render(
      <>
        <Select aria-label="Mode">
          <option value="a">A</option>
        </Select>
        <Checkbox label="Enabled" />
      </>,
    );

    expect(container.querySelector("select")?.className).toContain("ek-control");
    expect(container.querySelector('input[type="checkbox"]')).not.toBeNull();
    expect(container.querySelector(".ek-checkbox")?.textContent).toContain("Enabled");
  });

  it("renders a panel with an accessible heading and its actions", () => {
    render(
      <Panel actions={<Button>New</Button>} description="What this panel is." title="Slides">
        <p>Body</p>
      </Panel>,
    );

    expect(container.querySelector("h2")?.textContent).toBe("Slides");
    expect(container.querySelector(".ek-panel__description")?.textContent).toBe(
      "What this panel is.",
    );
    expect(container.querySelector(".ek-panel__header button")?.textContent).toBe("New");
  });

  it("renders a dialog in place, labels it, and dismisses it on Escape", () => {
    const onDismiss = vi.fn();
    render(
      <Dialog onDismiss={onDismiss} open title="Delete slide">
        Are you sure?
      </Dialog>,
    );

    const dialog = container.querySelector('[role="dialog"]');
    expect(dialog?.getAttribute("aria-modal")).toBe("true");
    expect(
      container.querySelector(`#${dialog?.getAttribute("aria-labelledby")}`)?.textContent,
    ).toBe("Delete slide");
    // Rendered inside the caller's own subtree, never portalled to document.body: an artifact's
    // dialog must not escape its isolated root.
    expect(document.body.querySelector(":scope > [role='dialog']")).toBeNull();

    act(() => {
      document.dispatchEvent(new KeyboardEvent("keydown", { bubbles: true, key: "Escape" }));
    });
    expect(onDismiss).toHaveBeenCalledTimes(1);
  });

  it("renders nothing for a closed dialog", () => {
    render(
      <Dialog onDismiss={() => undefined} open={false} title="Hidden">
        Body
      </Dialog>,
    );

    expect(container.querySelector('[role="dialog"]')).toBeNull();
  });

  it("exposes tabs with ARIA roles and arrow-key movement", () => {
    const onSelect = vi.fn();
    const tabs = [
      { content: <p>One</p>, id: "one", label: "One" },
      { content: <p>Two</p>, id: "two", label: "Two" },
    ];
    render(<Tabs label="Sections" onSelect={onSelect} selectedId="one" tabs={tabs} />);

    const tabButtons = [...container.querySelectorAll('[role="tab"]')];
    expect(tabButtons.map((tab) => tab.getAttribute("aria-selected"))).toEqual(["true", "false"]);
    expect(tabButtons.map((tab) => tab.getAttribute("tabindex"))).toEqual(["0", "-1"]);
    expect(container.querySelector('[role="tabpanel"]')?.textContent).toBe("One");

    act(() => {
      tabButtons[0]?.dispatchEvent(
        new KeyboardEvent("keydown", { bubbles: true, key: "ArrowRight" }),
      );
    });
    expect(onSelect).toHaveBeenCalledWith("two");
  });

  it("renders table and list primitives with header semantics", () => {
    render(
      <>
        <Table label="Slides">
          <TableHead>
            <TableRow>
              <TableCell header>Name</TableCell>
            </TableRow>
          </TableHead>
          <TableBody>
            <TableRow selected>
              <TableCell>Welcome</TableCell>
            </TableRow>
          </TableBody>
        </Table>
        <List label="Recent">
          <ListItem>First</ListItem>
        </List>
      </>,
    );

    expect(container.querySelector("table")?.getAttribute("aria-label")).toBe("Slides");
    expect(container.querySelector("th")?.getAttribute("scope")).toBe("col");
    expect(container.querySelector("tbody tr")?.getAttribute("aria-selected")).toBe("true");
    expect(container.querySelector(".ek-list__item")?.textContent).toBe("First");
  });

  it("never signals status with colour alone", () => {
    render(
      <>
        <Badge tone="success">Running</Badge>
        <ToastStack>
          <Toast title="Saved" tone="success">
            Everything went through.
          </Toast>
          <Toast title="Failed" tone="danger" />
        </ToastStack>
      </>,
    );

    expect(container.querySelector(".ek-badge__symbol")?.textContent).toBe("✓");
    expect(container.querySelector(".ek-badge__symbol")?.getAttribute("aria-hidden")).toBe("true");
    const toasts = [...container.querySelectorAll(".ek-toast")];
    expect(toasts[0]?.textContent).toContain("✓");
    expect(toasts[0]?.getAttribute("aria-live")).toBe("polite");
    expect(toasts[1]?.textContent).toContain("✕");
    expect(toasts[1]?.getAttribute("aria-live")).toBe("assertive");
  });

  it("renders empty, error, and loading states with the right announcements", () => {
    render(
      <>
        <EmptyState description="Add one to begin." title="No slides yet" />
        <ErrorState description="Try again." title="This could not load" />
        <LoadingState label="Loading slides…" />
      </>,
    );

    expect(container.querySelector(".ek-message")?.textContent).toContain("No slides yet");
    expect(container.querySelector('[role="alert"]')?.textContent).toContain("This could not load");
    const loading = container.querySelector('[role="status"]');
    expect(loading?.getAttribute("aria-live")).toBe("polite");
    expect(loading?.textContent).toContain("Loading slides…");
    expect(container.querySelector(".ek-spinner")?.getAttribute("aria-hidden")).toBe("true");
  });

  it("puts its stylesheet in whichever root it is rendered into", () => {
    const host = document.createElement("div");
    container.appendChild(host);
    const shadow = host.attachShadow({ mode: "open" });
    const shadowRoot = createRoot(shadow);

    act(() =>
      shadowRoot.render(
        <>
          <EkklesiaUiStyles />
          <Button>Inside</Button>
        </>,
      ),
    );

    expect(shadow.querySelector("style[data-ekklesia-ui]")?.textContent).toContain(".ek-button");
    // The host document never receives the artifact's copy.
    expect(document.head.querySelector("style[data-ekklesia-ui]")).toBeNull();

    act(() => shadowRoot.unmount());
  });
});