/* eslint-disable @typescript-eslint/no-non-null-assertion */

import React from "react";
import { render, screen } from "@testing-library/react";
import userEvent from "@testing-library/user-event";
import { describe, it, expect, vi, beforeEach } from "vitest";
import { WidgetPicker } from "../WidgetPicker";
import type { WidgetPlacement } from "@mosaic/shared";

describe("WidgetPicker", (): void => {
  const defaultProps = {
    open: true,
    onClose: vi.fn(),
    onAddWidget: vi.fn(),
    currentLayout: [] as WidgetPlacement[],
  };

  beforeEach((): void => {
    vi.clearAllMocks();
  });

  it("should render nothing when closed", (): void => {
    const { container } = render(<WidgetPicker {...defaultProps} open={false} />);
    expect(container.innerHTML).toBe("");
  });

  it("should render dialog when open", (): void => {
    render(<WidgetPicker {...defaultProps} />);
    expect(screen.getByRole("dialog", { name: "Add Widget" })).toBeInTheDocument();
  });

  it("should display Add Widget heading", (): void => {
    render(<WidgetPicker {...defaultProps} />);
    expect(screen.getByText("Add Widget")).toBeInTheDocument();
  });

  it("should render search input", (): void => {
    render(<WidgetPicker {...defaultProps} />);
    expect(screen.getByPlaceholderText("Search widgets...")).toBeInTheDocument();
  });

  it("should display available widgets", (): void => {
    render(<WidgetPicker {...defaultProps} />);
    // Widget registry has multiple widgets; at least one Add button should appear
    const addButtons = screen.getAllByText("Add");
    expect(addButtons.length).toBeGreaterThan(0);
  });

  it("should filter widgets by search text", async (): Promise<void> => {
    const user = userEvent.setup();
    render(<WidgetPicker {...defaultProps} />);

    const searchInput = screen.getByPlaceholderText("Search widgets...");
    // Type a search term that won't match any widget
    await user.type(searchInput, "zzz-nonexistent-widget-zzz");

    expect(screen.getByText("No widgets found")).toBeInTheDocument();
  });

  it("should call onAddWidget when Add is clicked", async (): Promise<void> => {
    const user = userEvent.setup();
    const onAdd = vi.fn();
    render(<WidgetPicker {...defaultProps} onAddWidget={onAdd} />);

    const addButtons = screen.getAllByText("Add");
    await user.click(addButtons[0]!);

    expect(onAdd).toHaveBeenCalledTimes(1);
    const placement = onAdd.mock.calls[0]![0] as WidgetPlacement;
    expect(placement).toHaveProperty("i");
    expect(placement).toHaveProperty("x");
    expect(placement).toHaveProperty("y");
    expect(placement).toHaveProperty("w");
    expect(placement).toHaveProperty("h");
  });

  it("should call onClose when close button is clicked", async (): Promise<void> => {
    const user = userEvent.setup();
    render(<WidgetPicker {...defaultProps} />);

    await user.click(screen.getByLabelText("Close"));
    expect(defaultProps.onClose).toHaveBeenCalledTimes(1);
  });

  it("should place new widgets after existing layout items", async (): Promise<void> => {
    const user = userEvent.setup();
    const onAdd = vi.fn();
    const existingLayout: WidgetPlacement[] = [
      { i: "test-1", x: 0, y: 0, w: 6, h: 3 },
      { i: "test-2", x: 0, y: 3, w: 6, h: 2 },
    ];
    render(<WidgetPicker {...defaultProps} onAddWidget={onAdd} currentLayout={existingLayout} />);

    const addButtons = screen.getAllByText("Add");
    await user.click(addButtons[0]!);

    const placement = onAdd.mock.calls[0]![0] as WidgetPlacement;
    // Should be placed at y=5 (3+2) to avoid overlap
    expect(placement.y).toBe(5);
  });
});