import { describe, expect, test } from "bun:test";
import { zoomPlugin } from "../plugins/zoomPlugin";
import { createKeyboardEvent, createTestCanvas, createWheelEvent } from "./canvasTestUtils";

describe("zoom plugin", () => {
  test("scales with modifier + wheel", () => {
    const harness = createTestCanvas(
      (canvas) => canvas.addPlugins(zoomPlugin()),
      {
        data: {
          size: { width: 1000, height: 1000 },
          origin: { x: 0, y: 0 },
          zoom: 1,
        },
      }
    );

    harness.handlers.onWheel?.(
      createWheelEvent({ deltaY: -10, metaKey: true })
    );

    expect(harness.getData().zoom).toBeCloseTo(1.2);
    expect(harness.getData().origin).toEqual({ x: -100, y: -100 });
  });

  test("supports keyboard shortcuts and preventDefault option", () => {
    const harness = createTestCanvas((canvas) => canvas.addPlugins(zoomPlugin({ onWheelShouldPreventDefault: true })), {
      data: {
        size: { width: 1000, height: 1000 },
        origin: { x: 0, y: 0 },
        zoom: 1,
      },
    });

    const wheelEvent = createWheelEvent({ deltaY: -10, metaKey: true });
    harness.handlers.onWheel?.(wheelEvent);
    expect(wheelEvent.defaultPrevented).toBe(true);

    harness.handlers.onKeyDown?.(createKeyboardEvent("=", { metaKey: true }));
    expect(harness.getData().zoom).toBeGreaterThan(1);

    harness.handlers.onKeyDown?.(createKeyboardEvent("-", { metaKey: true }));
    harness.handlers.onKeyDown?.(createKeyboardEvent("0", { metaKey: true }));
    expect(harness.getData().zoom).toBe(1);
  });
});