import { describe, expect, it } from "vitest";
import {
  createGameplayHistory,
  parseGameplayHistory,
  serializeGameplayHistory,
} from "../../src/state/playHistory";
import { createSession } from "../../src/state/session";

describe("gameplay history persistence", () => {
  it("round-trips independent bounded history", () => {
    const history = createGameplayHistory(
      createSession(Array<number>(16).fill(0)),
    );
    const encoded = serializeGameplayHistory(history, 4);
    const decoded = parseGameplayHistory(encoded, 4);
    expect(decoded).toEqual(history);
    (decoded.moments[0]!.state.values as number[])[0] = 4;
    expect(history.moments[0]!.state.values[0]).toBe(0);
  });

  it("rejects dangling and oversized persisted state", () => {
    const history = createGameplayHistory(
      createSession(Array<number>(16).fill(0)),
    );
    const raw = JSON.parse(serializeGameplayHistory(history, 4)) as {
      history: { currentMomentId: string };
    };
    raw.history.currentMomentId = "missing";
    expect(() => parseGameplayHistory(JSON.stringify(raw), 4)).toThrow(
      /missing active branch or moment/u,
    );
    expect(() => parseGameplayHistory("x".repeat(1_048_577), 4)).toThrow(
      /too large/u,
    );
  });
});