using System;
using System.Collections.Generic;
using System.IO;
using UnityEngine;

namespace Bansonic.datacheck
{
    public class DataCheck : MonoBehaviour
    {
        [Header("Settings")]
        [Tooltip("是否在游戏启动时自动校验歌曲运行时存档")]
        public bool checkOnStart = true;

        private const string Salt = "bansonic2026@fudongyouxi";
        private const string SongRuntimeCategory = "song_runtime";

        private void Start()
        {
            if (!checkOnStart)
            {
                Debug.Log("[DataCheck] 自动校验已关闭。");
                return;
            }

            ValidateSongRuntimeSaves();
        }

        private void ValidateSongRuntimeSaves()
        {
            float startTime = Time.realtimeSinceStartup;
            string persistentPath = Application.persistentDataPath;
            string legacyRoot = persistentPath;

            int encryptedFileCount = SecureSaveVault.CountEncryptedFiles(SongRuntimeCategory);
            int legacyFileCount = 0;
            try
            {
                legacyFileCount = Directory.GetFiles(legacyRoot, "SongData_*.json", SearchOption.TopDirectoryOnly).Length;
            }
            catch (Exception ex)
            {
                Debug.LogWarning($"[DataCheck] 统计旧版歌曲存档失败: {ex.Message}");
            }

            List<string> loadedJsonList = SecureSaveVault.LoadAllRawJson(SongRuntimeCategory, legacyRoot, "SongData_*.json");

            int totalFiles = Math.Max(encryptedFileCount + legacyFileCount, loadedJsonList.Count);
            int corruptedFiles = 0;

            for (int i = 0; i < loadedJsonList.Count; i++)
            {
                string json = loadedJsonList[i];
                SongDataSerializable serializable;
                if (!SongData.VerifyJsonIntegrity(json, Salt, out serializable))
                {
                    corruptedFiles++;
                }
            }

            int envelopeFailedFiles = Math.Max(0, encryptedFileCount - loadedJsonList.Count + legacyFileCount);
            corruptedFiles += envelopeFailedFiles;

            float duration = Time.realtimeSinceStartup - startTime;
            Debug.Log($"[DataCheck] 歌曲存档校验完成。耗时: {duration:F4}s | 总文件: {totalFiles} | 异常/篡改: {corruptedFiles}");

            if (corruptedFiles > 0)
            {
                Debug.LogWarning("[DataCheck] 检测到异常歌曲存档。安全存档层已阻止被破坏的数据继续参与读取。");
            }
            else if (totalFiles > 0)
            {
                Debug.Log("[DataCheck] 所有歌曲运行时存档通过校验。");
            }
        }
    }
}