using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using Minio;
using System;
using System.Globalization;
using System.IO;
using System.Security.Cryptography;

namespace MinIOAspNetMvcTest.Controllers
{
    public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;
        private readonly IConfiguration _cfg;

        public HomeController(ILogger<HomeController> logger, IConfiguration cfg)
        {
            _logger = logger;
            this._cfg = cfg;
        }

        public IActionResult Index()
        {
            return View();
        }

        [HttpPost]
        public IActionResult Upload()
        {
            if (Request.Form.Files != null && Request.Form.Files.Count > 0)
            {
                var file = Request.Form.Files[0];
                using Stream stream = file.OpenReadStream();
                var ext = GetExtension(file.FileName);
                var md5 = GetFileNameHash(stream);
                var name = $"{md5}.{ext}";
                var endpoint = this._cfg["minio:endpoint"];//"play.min.io";
                var accessKey = this._cfg["minio:accessKey"]; //"Q3AM3UQ867SPQQA43P2F";
                var secretKey = this._cfg["minio:secretKey"]; //"zuf+tfteSlswRu7BJ86wekitnifILbZam1KYY3TG";
                var bucketName = "upload";
                try
                {
                    var minio = new MinioClient(endpoint, accessKey, secretKey);//.WithSSL();
                    bool found = minio.BucketExistsAsync(bucketName).Result;
                    if (found)
                    {
                        minio.PutObjectAsync(bucketName, name, stream, stream.Length);
                        var path = $"/upload/{name}";
                        return Json(new { error = 0, url = path });
                    }
                    else
                    {
                        //minio.MakeBucketAsync(bucketName);
                        return Json(new { error = 2, msg = $"can not found bucket {bucketName}" });
                    }
                }
                catch (Exception ex)
                {
                    this._logger.LogError(ex.ToString());
                    return Json(new { error = 3, msg = ex.Message });
                }
            }
            return Json(new { error = 1, msg = "未选中文件" });
        }

        private static string GetExtension(string value)
        {
            return value.Substring(value.LastIndexOf('.') + 1).ToLower(CultureInfo.CurrentCulture);
        }

        private static string GetFileNameHash(Stream input)
        {
            using var hashAlg = SHA256.Create();
            byte[] hash = hashAlg.ComputeHash(input);
            return BitConverter.ToString(hash).Replace("-", string.Empty, true, CultureInfo.CurrentCulture).ToLower(CultureInfo.CurrentCulture);
        }
    }
}