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

import { createTable, joinTable, startGame } from "@/lib/minigames/poker/tables";

/**
 * Regression tests for the registry's game-start path. Guards against the
 * seat-map aliasing bug that once spawned phantom "Player null" engine seats
 * when a table started with fewer than four players.
 */

describe("poker table registry: startGame", () => {
  it("starts a heads-up game with exactly the two seated players", () => {
    const tableId = createTable(9001, "Host");
    joinTable(tableId, 9002, "Guest");

    const snapshot = startGame(tableId, 9001);

    const seatedIds = snapshot.seats.filter((id) => id !== null);
    expect(seatedIds).toHaveLength(2);
    const players = snapshot.you?.players ?? [];
    expect(players).toHaveLength(2);
    for (const player of players) {
      expect(player.name).not.toBe("Player null");
      expect(player.name.length).toBeGreaterThan(0);
      expect(player.eliminated).toBe(false);
    }
  });

  it("starts a three-handed game with exactly the three seated players", () => {
    const tableId = createTable(9101, "Host");
    joinTable(tableId, 9102, "Second");
    joinTable(tableId, 9103, "Third");

    const snapshot = startGame(tableId, 9101);

    const seatedIds = snapshot.seats.filter((id) => id !== null);
    expect(seatedIds).toHaveLength(3);
    const players = snapshot.you?.players ?? [];
    expect(players).toHaveLength(3);
    const names = players.map((player) => player.name);
    expect(names).not.toContain("Player null");
    expect(new Set(names).size).toBe(3);
  });

  it("keeps every engine player backed by a real seated user", () => {
    const tableId = createTable(9201, "Host");
    joinTable(tableId, 9202, "Second");

    const snapshot = startGame(tableId, 9201);
    const players = snapshot.you?.players ?? [];

    for (const player of players) {
      const userId = snapshot.seats[player.seatId];
      expect(userId).not.toBeNull();
      expect(typeof userId).toBe("number");
    }
  });
});