import type { PuzzleRunSnapshot } from '../../../packages/shared/src/contracts/puzzleRuntimeSession';

export function mergePuzzleServiceRuntimeState(
  currentRun: PuzzleRunSnapshot,
  serviceRun: PuzzleRunSnapshot,
): PuzzleRunSnapshot {
  if (!currentRun.currentLevel || !serviceRun.currentLevel) {
    return currentRun;
  }

  const serviceLevel = serviceRun.currentLevel;
  const leaderboardEntries =
    serviceLevel.leaderboardEntries.length > 0
      ? serviceLevel.leaderboardEntries
      : serviceRun.leaderboardEntries;

  // 中文注释：拼块布局和通关状态由前端即时裁决；后端快照只合并榜单与下一关 handoff。
  return {
    ...currentRun,
    runId: serviceRun.runId,
    entryProfileId: serviceRun.entryProfileId,
    clearedLevelCount: Math.max(
      currentRun.clearedLevelCount,
      serviceRun.clearedLevelCount,
    ),
    recommendedNextProfileId: serviceRun.recommendedNextProfileId,
    nextLevelMode: serviceRun.nextLevelMode,
    nextLevelProfileId: serviceRun.nextLevelProfileId,
    nextLevelId: serviceRun.nextLevelId,
    recommendedNextWorks: serviceRun.recommendedNextWorks,
    leaderboardEntries,
    currentLevel: {
      ...currentRun.currentLevel,
      leaderboardEntries:
        leaderboardEntries.length > 0
          ? leaderboardEntries
          : currentRun.currentLevel.leaderboardEntries,
    },
  };
}