submitScore (services/scores.js)

Handles score submission, validation, and user stats updates for a 2048 game backend.

// Source: https://github.com/hoangsonww/2048-Game | License: MIT | Copyright 2026 Son Nguyen
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * Score submission.
 *
 * This is the one write in the API with real invariants attached, so it lives
 * in a service rather than inline in a route: two routes submit scores (classic
 * and daily challenge) and both must apply the same plausibility check, the
 * same idempotency rule, and the same career-total update.
 */
import { Score } from "../models/Score.js";
import { User } from "../models/User.js";
import { boardSignature, checkScorePlausibility, hasWon, highestTile, isGameOver, normalizeBoard, summarizeBoard } from "../lib/game-rules.js";
import { badRequest } from "../lib/errors.js";
import { applyAchievements } from "

... (truncated -- full source via MCP)