import { describe, it, expect } from "vitest";

// Logic mirror test for clampOffset — tests the algorithm, not the component import
function clampOffset(
  dx: number,
  dy: number,
  xmin: number,
  ymin: number,
  xmax: number,
  ymax: number,
  roomMinX: number,
  roomMinY: number,
  roomMaxX: number,
  roomMaxY: number
): [number, number] {
  const clampedDx = Math.max(roomMinX - xmin, Math.min(roomMaxX - xmax, dx));
  const clampedDy = Math.max(roomMinY - ymin, Math.min(roomMaxY - ymax, dy));
  return [clampedDx, clampedDy];
}

describe("clampOffset", () => {
  const room = { minX: 50, minY: 50, maxX: 550, maxY: 450 };

  it("allows movement within room", () => {
    const [dx, dy] = clampOffset(50, 0, 100, 100, 300, 200, room.minX, room.minY, room.maxX, room.maxY);
    expect(dx).toBe(50);
    expect(dy).toBe(0);
  });

  it("clamps at right wall", () => {
    const [dx] = clampOffset(300, 0, 100, 100, 300, 200, room.minX, room.minY, room.maxX, room.maxY);
    expect(dx).toBe(250);
  });

  it("clamps at left wall", () => {
    const [dx] = clampOffset(-200, 0, 100, 100, 300, 200, room.minX, room.minY, room.maxX, room.maxY);
    expect(dx).toBe(-50);
  });

  it("clamps at bottom wall", () => {
    const [, dy] = clampOffset(0, 400, 100, 100, 300, 200, room.minX, room.minY, room.maxX, room.maxY);
    expect(dy).toBe(250);
  });

  it("clamps at top wall", () => {
    const [, dy] = clampOffset(0, -200, 100, 100, 300, 200, room.minX, room.minY, room.maxX, room.maxY);
    expect(dy).toBe(-50);
  });
});