import { describe, expect, it } from "vitest";
import type { Card, HandRank } from "@/lib/minigames/poker";
import { handRankTier, ROYAL_RANK_TIER } from "@/lib/minigames/poker/handRankStyle";
import { describeHandStrength } from "@/lib/minigames/poker/handHint";

function rank(category: number, tiebreakers: readonly number[]): HandRank {
  return { category, tiebreakers };
}

describe("handRankTier", () => {
  it("maps every category to its own tier", () => {
    expect(handRankTier(rank(0, [14]))).toBe(0);
    expect(handRankTier(rank(1, [9]))).toBe(1);
    expect(handRankTier(rank(2, [11, 4]))).toBe(2);
    expect(handRankTier(rank(3, [7]))).toBe(3);
    expect(handRankTier(rank(4, [9]))).toBe(4);
    expect(handRankTier(rank(5, [14]))).toBe(5);
    expect(handRankTier(rank(6, [13, 8]))).toBe(6);
    expect(handRankTier(rank(7, [3]))).toBe(7);
    expect(handRankTier(rank(8, [9]))).toBe(8);
  });

  it("promotes only the ace-high straight flush to the royal tier", () => {
    expect(handRankTier(rank(8, [14]))).toBe(ROYAL_RANK_TIER);
    expect(handRankTier(rank(8, [13]))).toBe(8);
    expect(handRankTier(rank(4, [14]))).not.toBe(ROYAL_RANK_TIER);
  });
});

describe("describeHandStrength tiers", () => {
  it("keeps high card at tier zero and a pocket pair at tier one", () => {
    const high = describeHandStrength(
      [
        { rank: 14, suit: "s" },
        { rank: 13, suit: "h" },
      ],
      [],
    );
    const pair = describeHandStrength(
      [
        { rank: 9, suit: "s" },
        { rank: 9, suit: "h" },
      ],
      [],
    );
    expect(high?.tier).toBe(0);
    expect(pair?.tier).toBe(1);
  });

  it("grades a royal flush at the top tier with the royal label", () => {
    const hole: Card[] = [
      { rank: 10, suit: "h" },
      { rank: 11, suit: "h" },
    ];
    const board: Card[] = [
      { rank: 12, suit: "h" },
      { rank: 13, suit: "h" },
      { rank: 14, suit: "h" },
      { rank: 2, suit: "s" },
      { rank: 3, suit: "d" },
    ];
    const hint = describeHandStrength(hole, board);
    expect(hint?.tier).toBe(ROYAL_RANK_TIER);
    expect(hint?.label).toBe("Royal flush");
  });
});