import { afterEach, describe, expect, it } from "vitest";
import {
  combatHasLineOfSight,
  isPositionInFacingArc,
  isSourceBehindTarget,
  projectCombatGroundPoint,
  registerCombatSpatialProvider,
  resetCombatSpatialProvider,
} from "./combatSpatial";

describe("renderer-independent combat spatial queries", () => {
  afterEach(resetCombatSpatialProvider);

  it("validates facing and behind arcs", () => {
    const actor = { id: "actor", position: [0, 0, 0] as const, yaw: 0 };
    expect(isPositionInFacingArc(actor, [0, 0, 5])).toBe(true);
    expect(isPositionInFacingArc(actor, [0, 0, -5])).toBe(false);
    expect(isSourceBehindTarget([0, 0, -2], actor)).toBe(true);
    expect(isSourceBehindTarget([0, 0, 2], actor)).toBe(false);
  });

  it("delegates line of sight and collision-safe ground projection", () => {
    registerCombatSpatialProvider({
      actor: () => null,
      hasLineOfSight: (_source, target) => target[0] >= 0,
      projectGroundPoint: (requested) => requested[1] > 5 ? null : [requested[0], 0, requested[2]],
    });
    expect(combatHasLineOfSight([0, 0, 0], [2, 0, 0])).toBe(true);
    expect(combatHasLineOfSight([0, 0, 0], [-2, 0, 0])).toBe(false);
    expect(projectCombatGroundPoint([2, 3, 4], 10)).toEqual([2, 0, 4]);
    expect(projectCombatGroundPoint([2, 8, 4], 10)).toBeNull();
  });
});