using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using Amazon.S3;
using Amazon.S3.Model;
using BMA.EHR.Recruit.Service.Core;
using BMA.EHR.Recruit.Service.Data;
using BMA.EHR.Recruit.Service.Models.Documents;
using Microsoft.EntityFrameworkCore;

namespace BMA.EHR.Recruit.Service.Services
{
    public class MinIOService
    {
        #region " Fields "

        private readonly ApplicationDbContext _context;
        private readonly IConfiguration _configuration;
        private readonly IWebHostEnvironment _webHostEnvironment;
        private readonly AmazonS3Client _s3Client;
        private string _bucketName = string.Empty;

        #endregion

        #region " Constructors "

        public MinIOService(ApplicationDbContext context,
                            IConfiguration configuration,
                            IWebHostEnvironment webHostEnvironment)
        {
            _context = context;
            _configuration = configuration;
            _webHostEnvironment = webHostEnvironment;

            var config = new AmazonS3Config
            {
                ServiceURL = _configuration["MinIO:Endpoint"],
                ForcePathStyle = true
            };

            _s3Client = new AmazonS3Client(_configuration["MinIO:AccessKey"], _configuration["MinIO:SecretKey"], config);
            this._bucketName = _configuration["MinIO:BucketName"] ?? "bma-recruit";
        }

        #endregion

        #region " Methods "

        public async Task<Document> UploadFile(IFormFile file, string newFileName = "")
        {
            var fileName = "";
            var fileExt = Path.GetExtension(file.FileName);
            if (newFileName != "")
                fileName = $"{newFileName}";
            else
                fileName = ContentDispositionHeaderValue.Parse(file.ContentDisposition).FileName.Trim('"');


            var tmpDir = Path.Combine(_webHostEnvironment.ContentRootPath, "tmp");
            if (!Directory.Exists(tmpDir))
                Directory.CreateDirectory(tmpDir);

            var tmpFile = Path.Combine(tmpDir, $"tmp_{DateTime.Now.ToString("ddMMyyyyHHmmss")}{fileExt}");

            try
            {
                using (var ms = new MemoryStream())
                {
                    var id = Guid.NewGuid();
                    file.CopyTo(ms);
                    var fileBytes = ms.ToArray();
                    System.IO.MemoryStream filestream = new System.IO.MemoryStream(fileBytes);

                    var request = new PutObjectRequest
                    {
                        BucketName = _bucketName,
                        Key = id.ToString("D"),
                        InputStream = filestream,
                        ContentType = file.ContentType,
                        CannedACL = S3CannedACL.PublicRead
                    };

                    await _s3Client.PutObjectAsync(request);

                    // create document object
                    var doc = new Document()
                    {
                        FileName = fileName,
                        FileType = file.ContentType,
                        FileSize = Convert.ToInt32(file.Length),
                        ObjectRefId = id,
                        CreatedDate = DateTime.Now
                    };

                    await _context.Documents.AddAsync(doc);
                    await _context.SaveChangesAsync();

                    return doc;
                }
            }
            catch
            {
                throw;
            }
            finally
            {
                File.Delete(tmpFile);
            }
        }

        #endregion
    }
}