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//
// 此源代码遵循位于源代码树根目录中的 LICENSE 文件的许可证

using Aliyun.OSS.Util;
using Furion.VirtualFileServer;
using Nest;
using OnceMi.AspNetCore.OSS;

namespace Admin.NET.Core.Service;

/// <summary>
/// 系统文件服务
/// </summary>
[ApiDescriptionSettings(Order = 410)]
public class SysFileService : IDynamicApiController, ITransient
{
    private readonly UserManager _userManager;
    private readonly SqlSugarRepository<SysFile> _sysFileRep;
    private readonly OSSProviderOptions _OSSProviderOptions;
    private readonly UploadOptions _uploadOptions;
    private readonly IOSSService _OSSService;

    public SysFileService(UserManager userManager,
        SqlSugarRepository<SysFile> sysFileRep,
        IOptions<OSSProviderOptions> oSSProviderOptions,
        IOptions<UploadOptions> uploadOptions,
        IOSSServiceFactory ossServiceFactory)
    {
        _userManager = userManager;
        _sysFileRep = sysFileRep;
        _OSSProviderOptions = oSSProviderOptions.Value;
        _uploadOptions = uploadOptions.Value;
        if (_OSSProviderOptions.IsEnable)
            _OSSService = ossServiceFactory.Create(Enum.GetName(_OSSProviderOptions.Provider));
    }

    /// <summary>
    /// 获取文件分页列表
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [DisplayName("获取文件分页列表")]
    public async Task<SqlSugarPagedList<SysFile>> Page(PageFileInput input)
    {
        return await _sysFileRep.AsQueryable()
            .WhereIF(!string.IsNullOrWhiteSpace(input.FileName), u => u.FileName.Contains(input.FileName.Trim()))
            .WhereIF(
                !string.IsNullOrWhiteSpace(input.StartTime.ToString()) &&
                !string.IsNullOrWhiteSpace(input.EndTime.ToString()),
                u => u.CreateTime >= input.StartTime && u.CreateTime <= input.EndTime)
            .OrderBy(u => u.CreateTime, OrderByType.Desc)
            .ToPagedListAsync(input.Page, input.PageSize);
    }

    /// <summary>
    /// 上传文件
    /// </summary>
    /// <param name="file"></param>
    /// <param name="path"></param>
    /// <returns></returns>
    [DisplayName("上传文件")]
    public async Task<SysFile> UploadFile([Required] IFormFile file, [FromQuery] string? path)
    {
        return await HandleUploadFile(file, path);
    }

    /// <summary>
    /// 上传文件Base64
    /// </summary>
    /// <param name="strBase64"></param>
    /// <param name="fileName"></param>
    /// <param name="contentType"></param>
    /// <param name="path"></param>
    /// <returns></returns>
    private async Task<SysFile> UploadFileFromBase64(string strBase64, string fileName, string contentType,
        string? path)
    {
        byte[] fileData = Convert.FromBase64String(strBase64);
        var ms = new MemoryStream();
        ms.Write(fileData);
        ms.Seek(0, SeekOrigin.Begin);
        if (string.IsNullOrEmpty(fileName))
            fileName = $"{YitIdHelper.NextId()}.jpg";
        if (string.IsNullOrEmpty(contentType))
            contentType = "image/jpg";
        IFormFile formFile = new FormFile(ms, 0, fileData.Length, "file", fileName)
        {
            Headers = new HeaderDictionary(),
            ContentType = contentType
        };
        return await UploadFile(formFile, path);
    }

    /// <summary>
    /// 上传文件Base64
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [DisplayName("上传文件Base64")]
    [HttpPost]
    public async Task<SysFile> UploadFileFromBase64(UploadFileFromBase64Input input)
    {
        return await UploadFileFromBase64(input.FileDataBase64, input.FileName, input.ContentType, input.Path);
    }

    /// <summary>
    /// 上传多文件
    /// </summary>
    /// <param name="files"></param>
    /// <returns></returns>
    [DisplayName("上传多文件")]
    public async Task<List<SysFile>> UploadFiles([Required] List<IFormFile> files)
    {
        var filelist = new List<SysFile>();
        foreach (var file in files)
        {
            filelist.Add(await UploadFile(file, ""));
        }

        return filelist;
    }
    

    /// <summary>
    /// 根据文件Id或Url下载
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [DisplayName("根据文件Id或Url下载")]
    public async Task<IActionResult> DownloadFile(FileInput input)
    {
        var file = input.Id > 0 ? await GetFile(input) : await _sysFileRep.GetFirstAsync(u => u.Url == input.Url);
        var fileName = HttpUtility.UrlEncode(file.FileName, Encoding.GetEncoding("UTF-8"));
        if (_OSSProviderOptions.IsEnable)
        {
            var filePath = string.Concat(file.FilePath, "/", file.Id.ToString() + file.Suffix);
            var stream = await (await _OSSService.PresignedGetObjectAsync(file.BucketName.ToString(), filePath, 5))
                .GetAsStreamAsync();
            return new FileStreamResult(stream.Stream, "application/octet-stream")
                { FileDownloadName = fileName + file.Suffix };
        }
        else
        {
            var filePath = Path.Combine(file.FilePath, file.Id.ToString() + file.Suffix);
            var path = Path.Combine(App.WebHostEnvironment.WebRootPath, filePath);
            return new FileStreamResult(new FileStream(path, FileMode.Open), "application/octet-stream")
                { FileDownloadName = fileName + file.Suffix };
        }
    }

    /// <summary>
    /// 下载指定文件Base64格式
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    [AllowAnonymous]
    public async Task<string> DownloadFileBase64([FromBody] string url)
    {
        if (_OSSProviderOptions.IsEnable)
        {
            using var httpClient = new HttpClient();
            HttpResponseMessage response = await httpClient.GetAsync(url);
            if (response.IsSuccessStatusCode)
            {
                // 读取文件内容并将其转换为 Base64 字符串
                byte[] fileBytes = await response.Content.ReadAsByteArrayAsync();
                return Convert.ToBase64String(fileBytes);
            }
            else
            {
                throw new HttpRequestException($"Request failed with status code: {response.StatusCode}");
            }
        }
        else
        {
            var sysFile = await _sysFileRep.GetFirstAsync(u => u.Url == url) ?? throw Oops.Oh($"文件不存在");
            var filePath = Path.Combine(App.WebHostEnvironment.WebRootPath, sysFile.FilePath);
            if (!Directory.Exists(filePath))
                Directory.CreateDirectory(filePath);

            var realFile = Path.Combine(filePath, $"{sysFile.Id}{sysFile.Suffix}");
            if (!File.Exists(realFile))
                throw Oops.Oh($"文件[{realFile}]不在存");
            byte[] fileBytes = File.ReadAllBytes(realFile);
            return Convert.ToBase64String(fileBytes);
        }
    }

    /// <summary>
    /// 删除文件
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [ApiDescriptionSettings(Name = "Delete"), HttpPost]
    [DisplayName("删除文件")]
    public async Task DeleteFile(DeleteFileInput input)
    {
        var file = await _sysFileRep.GetFirstAsync(u => u.Id == input.Id);
        if (file != null)
        {
            await _sysFileRep.DeleteAsync(file);

            if (_OSSProviderOptions.IsEnable)
            {
                await _OSSService.RemoveObjectAsync(file.BucketName.ToString(),
                    string.Concat(file.FilePath, "/", $"{input.Id}{file.Suffix}"));
            }
            else
            {
                var filePath = Path.Combine(App.WebHostEnvironment.WebRootPath, file.FilePath,
                    input.Id.ToString() + file.Suffix);
                if (File.Exists(filePath))
                    File.Delete(filePath);
            }
        }
    }

    /// <summary>
    /// 更新文件
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [ApiDescriptionSettings(Name = "Update"), HttpPost]
    [DisplayName("更新文件")]
    public async Task UpdateFile(FileInput input)
    {
        var isExist = await _sysFileRep.IsAnyAsync(u => u.Id == input.Id);
        if (!isExist) throw Oops.Oh(ErrorCodeEnum.D8000);

        await _sysFileRep.UpdateAsync(u => new SysFile() { FileName = input.FileName }, u => u.Id == input.Id);
    }

    /// <summary>
    /// 获取文件
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    private async Task<SysFile> GetFile([FromQuery] FileInput input)
    {
        var file = await _sysFileRep.GetFirstAsync(u => u.Id == input.Id);
        return file ?? throw Oops.Oh(ErrorCodeEnum.D8000);
    }

    /// <summary>
    /// 上传文件
    /// </summary>
    /// <param name="file">文件</param>
    /// <param name="savePath">路径</param>
    /// <returns></returns>
    private async Task<SysFile> HandleUploadFile(IFormFile file, string savePath)
    {
        if (file == null) throw Oops.Oh(ErrorCodeEnum.D8000);

        // 判断是否重复上传的文件
        var sizeKb = (long)(file.Length / 1024.0); // 大小KB
        var fileMd5 = string.Empty;
        if (_uploadOptions.EnableMd5)
        {
            using (var fileStream = file.OpenReadStream())
            {
                fileMd5 = OssUtils.ComputeContentMd5(fileStream, fileStream.Length);
            }

            /*
             * Mysql8 中如果使用了 utf8mb4_general_ci 之外的编码会出错，尽量避免在条件里使用.ToString()
             * 因为 Squsugar 并不是把变量转换为字符串来构造SQL语句，而是构造了CAST(123 AS CHAR)这样的语句，这样这个返回值是utf8mb4_general_ci，所以容易出错。
             */
            var strSizeKb = sizeKb.ToString();
            var sysFile =
                await _sysFileRep.GetFirstAsync(
                    u => u.FileMd5 == fileMd5 && (u.SizeKb == null || u.SizeKb == strSizeKb));
            if (sysFile != null) return sysFile;
        }

        var path = savePath;
        if (string.IsNullOrWhiteSpace(savePath))
        {
            path = _uploadOptions.Path;
            var reg = new Regex(@"(\{.+?})");
            var match = reg.Matches(path);
            match.ToList().ForEach(a =>
            {
                var str = DateTime.Now.ToString(a.ToString().Substring(1, a.Length - 2)); // 每天一个目录
                path = path.Replace(a.ToString(), str);
            });
        }

        if (!_uploadOptions.ContentType.Contains(file.ContentType))
            throw Oops.Oh(ErrorCodeEnum.D8001);

        if (sizeKb > _uploadOptions.MaxSize)
            throw Oops.Oh(ErrorCodeEnum.D8002);

        var suffix = Path.GetExtension(file.FileName).ToLower(); // 后缀
        if (string.IsNullOrWhiteSpace(suffix))
        {
            var contentTypeProvider = FS.GetFileExtensionContentTypeProvider();
            suffix = contentTypeProvider.Mappings.FirstOrDefault(u => u.Value == file.ContentType).Key;
            // 修改 image/jpeg 类型返回的 .jpe 后缀
            if (suffix == ".jpe")
                suffix = ".jpg";
        }

        if (string.IsNullOrWhiteSpace(suffix))
            throw Oops.Oh(ErrorCodeEnum.D8003);

        var newFile = new SysFile
        {
            Id = YitIdHelper.NextId(),
            // BucketName = _OSSProviderOptions.IsEnable ? _OSSProviderOptions.Provider.ToString() : "Local",
            // 阿里云对bucket名称有要求，1.只能包括小写字母，数字，短横线（-）2.必须以小写字母或者数字开头  3.长度必须在3-63字节之间
            // 无法使用Provider
            BucketName = _OSSProviderOptions.IsEnable ? _OSSProviderOptions.Bucket : "Local",
            FileName = Path.GetFileNameWithoutExtension(file.FileName),
            Suffix = suffix,
            SizeKb = sizeKb.ToString(),
            FilePath = path,
            FileMd5 = fileMd5,
        };

        newFile.FileName = newFile.Id + suffix; // 文件最终名称
        if (_OSSProviderOptions.IsEnable)
        {
            newFile.Provider = Enum.GetName(_OSSProviderOptions.Provider);
            var filePath = string.Concat(path, "/", newFile.FileName);
            await _OSSService.PutObjectAsync(newFile.BucketName, filePath, file.OpenReadStream());
            //  http://<你的bucket名字>.oss.aliyuncs.com/<你的object名字>
            //  生成外链地址 方便前端预览
            switch (_OSSProviderOptions.Provider)
            {
                case OSSProvider.Aliyun:
                case OSSProvider.HuaweiCloud:
                    newFile.Url =
                        $"{(_OSSProviderOptions.IsEnableHttps ? "https" : "http")}://{newFile.BucketName}.{_OSSProviderOptions.Endpoint}/{filePath}";
                    break;

                case OSSProvider.Minio:
                    // 获取Minio文件的下载或者预览地址
                    // newFile.Url = await GetMinioPreviewFileUrl(newFile.BucketName, filePath);// 这种方法生成的Url是有7天有效期的，不能这样使用
                    // 需要在MinIO中的Buckets开通对 Anonymous 的readonly权限
                    newFile.Url =
                        $"{(_OSSProviderOptions.IsEnableHttps ? "https" : "http")}://{_OSSProviderOptions.Endpoint}/{newFile.BucketName}/{filePath}";
                    break;
            }
        }
        else
        {
            newFile.Provider = ""; // 本地存储 Provider 显示为空
            var filePath = Path.Combine(App.WebHostEnvironment.WebRootPath, path);
            if (!Directory.Exists(filePath))
                Directory.CreateDirectory(filePath);

            var realFile = Path.Combine(filePath, newFile.FileName);
            //IDetector detector;
            using (var stream = File.Create(realFile))
            {
                await file.CopyToAsync(stream);
                //detector = stream.DetectFiletype();
            }
            //var realExt = detector.Extension; // 真实扩展名
            //// 二次校验扩展名
            //if (!string.Equals(realExt, suffix.Replace(".", ""), StringComparison.OrdinalIgnoreCase))
            //{
            //    var delFilePath = Path.Combine(App.WebHostEnvironment.WebRootPath, realFile);
            //    if (File.Exists(delFilePath))
            //        File.Delete(delFilePath);
            //    throw Oops.Oh(ErrorCodeEnum.D8001);
            //}

            // 生成外链
            var host = CommonUtil.GetLocalhost();
            if (!host.EndsWith("/"))
                host += "/";
            newFile.Url = $"{host}{newFile.FilePath}/{newFile.Id + newFile.Suffix}";
        }

        await _sysFileRep.AsInsertable(newFile).ExecuteCommandAsync();
        return newFile;
    }

    ///// <summary>
    ///// 获取Minio文件的下载或者预览地址
    ///// </summary>
    ///// <param name="bucketName">桶名</param>
    ///// <param name="fileName">文件名</param>
    ///// <returns></returns>
    //private async Task<string> GetMinioPreviewFileUrl(string bucketName, string fileName)
    //{
    //    return await _OSSService.PresignedGetObjectAsync(bucketName, fileName, 7);
    //}

    /// <summary>
    /// 上传头像
    /// </summary>
    /// <param name="file"></param>
    /// <returns></returns>
    [DisplayName("上传头像")]
    public async Task<SysFile> UploadAvatar([Required] IFormFile file)
    {
        var sysFile = await UploadFile(file, "Upload/Avatar");

        var sysUserRep = _sysFileRep.ChangeRepository<SqlSugarRepository<SysUser>>();
        var user = sysUserRep.GetFirst(u => u.Id == _userManager.UserId);
        // 删除已有头像文件
        if (!string.IsNullOrWhiteSpace(user.Avatar))
        {
            var fileId = Path.GetFileNameWithoutExtension(user.Avatar);
            await DeleteFile(new DeleteFileInput { Id = long.Parse(fileId) });
        }

        await sysUserRep.UpdateAsync(u => new SysUser() { Avatar = sysFile.Url }, u => u.Id == user.Id);
        return sysFile;
    }

    /// <summary>
    /// 上传电子签名
    /// </summary>
    /// <param name="file"></param>
    /// <returns></returns>
    [DisplayName("上传电子签名")]
    public async Task<SysFile> UploadSignature([Required] IFormFile file)
    {
        var sysFile = await UploadFile(file, "Upload/Signature");

        var sysUserRep = _sysFileRep.ChangeRepository<SqlSugarRepository<SysUser>>();
        var user = sysUserRep.GetFirst(u => u.Id == _userManager.UserId);
        // 删除已有电子签名文件
        if (!string.IsNullOrWhiteSpace(user.Signature) && user.Signature.EndsWith(".png"))
        {
            var fileId = Path.GetFileNameWithoutExtension(user.Signature);
            await DeleteFile(new DeleteFileInput { Id = long.Parse(fileId) });
        }

        await sysUserRep.UpdateAsync(u => new SysUser() { Signature = sysFile.Url }, u => u.Id == user.Id);
        return sysFile;
    }
}