using Newtonsoft.Json;
using System.Collections;
using System;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.UI;
using System.Security.Cryptography;
using Sirenix.Utilities;
using System.Security.Policy;
using System.Text;

public class SecurityCheck : MonoBehaviour
{
    private string hashFileName = "sec_code.json";// 用于存储文件路径和对应哈希值的字典
    private Dictionary<string, string> AS_fileHashes = new Dictionary<string, string>();//文件中Hash
    private Dictionary<string, string> fileHashes = new Dictionary<string, string>();//当前文件Hash
    private string appFolderPath = Application.streamingAssetsPath + "\\..\\..\\";
    public List<string> skip_files = new List<string>();//读取跳过的文件
    [HideInInspector]
    public int total = 0;//总文件数量
    [HideInInspector]
    public int read = 0;
    [HideInInspector]
    public bool check_finish = false;
    [HideInInspector]
    public bool result = false;

    public static SecurityCheck instance;

    List<string> files = new List<string>();

    [HideInInspector]
    public string debugStr = "";


    // 获取文件哈希值的方法
    private string GetHash(string path)
    {
        using (var hash = SHA256.Create())
        using (var stream = new FileStream(path, FileMode.Open, FileAccess.Read))
        {
            byte[] hashBytes = hash.ComputeHash(stream);
            return BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
        }
    }

    IEnumerator CalculateHashes(List<string> files)
    {
        if (AS_fileHashes == null || AS_fileHashes.Count == 0)//没有校验文件
        {
            Debug.Log("缺少校验文件");
            result = false;
            check_finish = true;
            yield break;

        }
        if (files.Count != AS_fileHashes.Count)
        {
            Debug.Log("文件数量不对");
#if UNITY_EDITOR
            foreach (var item in files)
            {
                bool find = false;
                string f_name = Path.GetFileName(item).ToLower();
                foreach (var item2 in AS_fileHashes)
                {
                    //string f_name2 = Path.GetFileName(y.Key);
                    //Debug.Log("===>" + f_name);
                    if (item2.Key.Contains(f_name))
                    {
                        find = true;
                        break;
                    }
                }
                if (!find)
                {
                    Debug.Log("缺少文件:" + f_name);
                }
            }
#endif
            result = false;
            check_finish = true;
            yield break;
        }
        check_finish = false;
        total = files.Count;
        read = 0;
        foreach (string filePath in files)
        {
            try
            {
                string absolutePath = Path.GetFullPath(filePath);
                string hash = GetHash(absolutePath);
                string relativePath = PathUtils.GetRelativeToStreamingAssets(absolutePath, true);
                debugStr = relativePath;

                if (!AS_fileHashes.ContainsKey(relativePath) || !hash.Equals(AS_fileHashes[relativePath]))
                {
                    if (!AS_fileHashes.ContainsKey(relativePath))
                        Debug.Log("缺少文件:" + absolutePath + "=>" + relativePath);
                    else
                        Debug.Log("值不对：" + relativePath + "\n" + hash + "\n" + AS_fileHashes[relativePath]);
                    //Debug.LogError($"MD5错误");
                    result = false;
                    check_finish = true;
                    yield break;
                }
                //}
                //fileHashes[filePath] = hash;

            }
            catch (Exception ex)
            {
                Debug.LogError($"Error calculating hash for file {filePath}: {ex.Message}");
                result = false;
                check_finish = true;
                yield break;
            }
            read++;
            yield return null;
        }
        result = true;
        check_finish = true;
    }

    private void Awake()
    {
        instance = this;
        check_finish = false;
        fileHashes.Clear();
        AS_fileHashes.Clear();
        files.Clear();
        AS_fileHashes = LoadHashesFromJson(Application.streamingAssetsPath + "\\" + hashFileName);
#if UNITY_EDITOR
        appFolderPath = "E:\\HQB\\文件打包\\0402\\10002\\";
#endif
        try
        {
            string[] allFiles = Directory.GetFiles(appFolderPath, "*", SearchOption.AllDirectories);
            allFiles.ForEach(x =>
            {
                bool skip = false;
                foreach (var item in skip_files)
                {
                    if (x.Contains(item.Trim()))
                    {
                        skip = true;
                        break;
                    }
                }
                if (!skip)
                    files.Add(x);
            });
            total = files.Count;
        }
        catch (Exception ex)
        {
            Debug.LogError("校验文件读取故障：" + ex.Message);
        }
        StartCoroutine(CalculateHashes(files));
    }

    public string DecodeFromBase64(string encoded)
    {
        byte[] encodedBytes = Convert.FromBase64String(encoded);
        return Encoding.UTF8.GetString(encodedBytes);
    }

    private Dictionary<string, string> LoadHashesFromJson(string filePath)
    {
        if (!File.Exists(filePath))
        {
            Debug.LogError($"File not found at path: {filePath}");

            return null;
        }

        try
        {
            string json64 = File.ReadAllText(filePath);
            string json = DecodeFromBase64(json64);
            Dictionary<string, string> hashes = JsonConvert.DeserializeObject<Dictionary<string, string>>(json);

            Debug.Log($"Hashes loaded from {filePath}");
            return hashes;
        }
        catch (Exception ex)
        {
            Debug.LogError($"Failed to load hashes from {filePath}: {ex.Message}");
            return null;
        }
    }

}