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

import { applyRollModifier, roll2D6, rollD3, rollD66, rollDice } from "./dice";

function createSequenceRoller(values: number[]) {
  let index = 0;

  return () => {
    const next = values[index];
    index += 1;
    return next;
  };
}

describe("dice rules", () => {
  it("maps d3 rolls from a d6 source", () => {
    const result = rollD3(createSequenceRoller([5]));

    expect(result.rolls).toEqual([5]);
    expect(result.total).toBe(3);
    expect(result.modifiedTotal).toBe(3);
  });

  it("preserves primary and secondary dice for d66", () => {
    const result = rollD66(createSequenceRoller([4, 2]));

    expect(result.primary).toBe(4);
    expect(result.secondary).toBe(2);
    expect(result.total).toBe(42);
  });

  it("applies modifiers with clamping when limits are provided", () => {
    const roll = roll2D6(createSequenceRoller([6, 6]));
    const modified = applyRollModifier(roll, 3, { min: 2, max: 12 });

    expect(modified.modifiedTotal).toBe(12);
    expect(modified.clamped).toBe(true);
  });

  it("routes dice kinds through the shared roller", () => {
    const result = rollDice("d6", createSequenceRoller([2]));

    expect(result.total).toBe(2);
    expect(result.diceKind).toBe("d6");
  });
});