using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using Minio.Exceptions;
using Minio;
using Microsoft.Extensions.Configuration;
using Minio.DataModel.Args;
using Minio.DataModel;

namespace Infrastructure.CloudSdk.minio;
public class MinioService
{
    private  IMinioClient _minioClient;
    public readonly string _bucketName = null;
    public MinioService()
    {
        InitializeMinIOClient();
        EnsureBucketExistsAsync(_bucketName).Wait();
    }
    private void InitializeMinIOClient()
    {
        var builder = new ConfigurationBuilder()
                    .SetBasePath(Directory.GetCurrentDirectory())
                    .AddJsonFile("global.json", optional: false, reloadOnChange: true);
        // 构建配置
        var config = builder.Build();

        _minioClient = new MinioClient()
            .WithEndpoint(config["Minio:Endpoint"])
            .WithCredentials(config["Minio:AccessKey"], config["Minio:SecretKey"])
            .Build();
    }
    /// <summary>
    /// 创建存储桶（如果不存在）
    /// </summary>
    public async Task CreateBucketIfNotExists(string _bucketName)
    {
        var existsArgs = new BucketExistsArgs().WithBucket(_bucketName);
        bool found = await _minioClient.BucketExistsAsync(existsArgs);
        if (!found)
        {

            var makeArgs = new MakeBucketArgs().WithBucket(_bucketName);
            await _minioClient.MakeBucketAsync(makeArgs);
            Console.WriteLine($"Bucket {_bucketName} created.");
        }
    }
    public async Task EnsureBucketExistsAsync(string bucketName)
    {
        var existsArgs = new BucketExistsArgs().WithBucket(bucketName);
        var x = await _minioClient.BucketExistsAsync(existsArgs);
        Console.WriteLine($" {bucketName} exist status: " + x);
        // 如果存储桶不存在，则创建存储桶
        if (!x)
        {
            var makeArgs = new MakeBucketArgs().WithBucket(bucketName);
            await _minioClient.MakeBucketAsync(makeArgs);
        }
    }
 

    /// <summary>
    /// 下载文件
    /// </summary>
    public async Task DownLoadObject(string bucketName, string objectKey, string localDir, string objectETag,
            CancellationToken token = default)
    {
        var index = objectKey.LastIndexOf("/", StringComparison.Ordinal);
        if (index > 0)
        {
            var dir = Path.Combine(localDir, objectKey.Substring(0, index));
            if (!Directory.Exists(dir))
            {
                Directory.CreateDirectory(dir);
            }
        }

        var localPath = Path.Combine(localDir, objectKey.Replace('/', Path.DirectorySeparatorChar));
        var getArgs = new GetObjectArgs()
            .WithBucket(string.IsNullOrEmpty(bucketName) ? _bucketName : bucketName)
            .WithObject(objectKey)
            .WithFile(localPath);
        var stat = await _minioClient.GetObjectAsync(getArgs, token);
   
    }

    /// <summary>
    /// 列出所有对象
    /// </summary>
    public async Task<IAsyncEnumerable<Item>> ListAllObject(string bucketName, string prefix, bool recursive,
            CancellationToken token = default)
    {
        // Just list of objects
        // Check whether 'mybucket' exists or not.
        if (string.IsNullOrEmpty(bucketName))
        {
            bucketName = _bucketName;
        }

        var existsArgs = new BucketExistsArgs().WithBucket(bucketName);
        var found = await _minioClient.BucketExistsAsync(existsArgs, token);
        if (found)
        {
            var args = new ListObjectsArgs()
                .WithBucket(bucketName)
                .WithPrefix(prefix)
                .WithRecursive(recursive);
            return _minioClient.ListObjectsEnumAsync(args, token);
        }

        Console.WriteLine("mybucket does not exist");
        throw new Exception("bucket not found");
    }
    /// <summary>
    /// 删除文件
    /// </summary>
    public async Task DeleteFile(string objectName)
    {
        try
        {
            var deleteargs = new RemoveObjectArgs().WithBucket(_bucketName).WithObject(objectName);
            await _minioClient.RemoveObjectAsync(deleteargs);
            Console.WriteLine($"File {objectName} deleted.");
        }
        catch (MinioException ex)
        {
            Console.WriteLine($"MinIO Exception: {ex.Message}");
        }
    }
}