using Microsoft.AspNetCore.StaticFiles;
using Microsoft.Extensions.Options;
using XF.Domain.Dependency;

namespace FileStorage;

public class DefaultFileStorage : IFileStorage, IScopeDependency
{

    private readonly IFileMetadataRepository _fileMetadataRepository;
    private readonly IOptionsSnapshot<StorageConfiguration> _fileUploadOptions;

    public DefaultFileStorage(IFileMetadataRepository fileMetadataRepository,IOptionsSnapshot<StorageConfiguration> optionsSnapshot)
    {
        _fileMetadataRepository = fileMetadataRepository;
        _fileUploadOptions = optionsSnapshot;
    }

    /// <summary>
    /// 本地上传
    /// </summary>
    /// <param name="fileName"></param>
    /// <param name="length"></param>
    /// <param name="extraInfo"></param>
    /// <param name="fileData"></param>
    /// <param name="client"></param>
    /// <returns></returns>
    public FileMetadata Upload(string fileName, long length, string extraInfo, Stream fileData, string client)
    {
        if (fileName == null)
        {
            fileName = "unkown";
        }
        fileName = fileName.Replace("<", "").Replace(">", "").Replace(" ", "");

        var rv = UploadLoca(fileName, length, extraInfo, fileData,client);
        if (!string.IsNullOrEmpty(rv))
        {
            FileMetadata fileModel = new FileMetadata();
            fileModel.Client = client;
            fileModel.FileName = fileName;
            var ext = string.Empty;
            if (string.IsNullOrEmpty(fileName) == false)
            {
                var dotPos = fileName.LastIndexOf('.');
                ext = fileName[(dotPos + 1)..];
            }
            fileModel.FileExt = ext;
            fileModel.Path = rv;
            fileModel.Length = length;
            fileModel.SaveMode = _fileUploadOptions.Value.Impt;
            fileModel.ExtraInfo = extraInfo;
            fileModel.UploadTime = DateTime.Now;
            _fileMetadataRepository.AddAsync(fileModel);
            return fileModel;
        }
        return null;
    }

    public async Task<Uri> GetFileUrlAsync(string id)
    {
        var fileMetadata = await _fileMetadataRepository.GetAsync(id);
        if (fileMetadata != null)
        {
            return new Uri(_fileUploadOptions.Value.Local.VisDomain+fileMetadata.Path);
        }
        return new Uri("");
    }

    public (Stream stream, string contentType,string fileName) DownLoadFile(string id)
    {
        var fileMetadata = _fileMetadataRepository.Get(id);
        if (fileMetadata!=null)
        {
            string filePath = Path.Combine(Directory.GetCurrentDirectory(), fileMetadata.Path);
            var contentType =  TaskGetFileContentTypeAsync(fileMetadata.Path);
            var stream = File.OpenRead(filePath);
            return (stream,contentType,fileMetadata.FileName);
        }
        return (null,"","");
    }

    public async Task<bool> DelFileAsync(string id)
    {
        var fileMetadata = await _fileMetadataRepository.GetAsync(id);
        if (fileMetadata!=null)
        {
            string filePath = Path.Combine(Directory.GetCurrentDirectory(), fileMetadata.Path);
            await _fileMetadataRepository.RemoveAsync(id);
            File.Delete(filePath);
            return true;
        }
        return false;
    }

    private string TaskGetFileContentTypeAsync(string fileName)
    {
        string suffix = Path.GetExtension(fileName);
        var provider = new FileExtensionContentTypeProvider();
        var contentType = provider.Mappings[suffix];
        return contentType;
    }


    private string UploadLoca(string fileName, long length, string extraInfo, Stream fileData,string client)
    {
        var settings = _fileUploadOptions.Value.Local;
        string groupDir = "";
        if (settings != null)
        {
            groupDir = settings.Path;
        }
        if (string.IsNullOrEmpty(groupDir))
        {
            groupDir = "uploads";
        }
        string sub = DateTime.Now.ToString("yyyyMMdd");

        groupDir = Path.Combine(groupDir,client, sub);

        string pathHeader = groupDir;

        string fulldir = GetFullPath(pathHeader);
        if (!Directory.Exists(fulldir))
        {
            Directory.CreateDirectory(fulldir);
        }

        var ext = string.Empty;
        if (!string.IsNullOrEmpty(fileName))
        {
            var dotPos = fileName.LastIndexOf('.');
            ext = fileName.Substring(dotPos + 1);
        }
        var filename = $"{Guid.NewGuid().ToString().Replace("-", string.Empty)}.{ext}";
        var fullPath = Path.Combine(fulldir, filename);
        using (var fileStream = File.Create(fullPath))
        {
            fileData.CopyTo(fileStream);
        }
        fileData.Dispose();

        return (Path.Combine(pathHeader, filename));
    }

    private string GetFullPath(string path)
    {
        string rv = "";
        if (path.StartsWith("."))
        {
            rv = Path.Combine(Directory.GetCurrentDirectory(), path);
        }
        else
        {
            rv = path;
        }
        rv = Path.GetFullPath(rv);
        return rv;
    }
}