using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Threading.Tasks;
using CoviDok.Api;
using CoviDok.Api.Request;
using CoviDok.BLL;
using CoviDok.BLL.Sessions;
using CoviDok.BLL.Storage;
using CoviDok.Data.SessionProviders;
using CoviDok.Data.StorageProviders;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Options;
using NCuid;

namespace CoviDok.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class ImagesController : ControllerBase
    {
        private StorageHandler MinioHandler = new StorageHandler(new MinioProvider());
        private readonly string BucketName = "test1";

        private readonly SessionHandler Handler = new SessionHandler();

        private static Stream MakeStream(string s)
        {
            var stream = new MemoryStream();
            var writer = new StreamWriter(stream);
            writer.Write(s);
            writer.Flush();
            stream.Position = 0;
            return stream;
        }

        [HttpPost("Upload")]
        public async Task<ActionResult<GenericResponse>> OnPostImage(ImagePost post)
        {
            GenericResponse response = new GenericResponse();            
            try
            {
                Session s = await Handler.GetSession(post.SessionId);
                Console.WriteLine("ImagesController:OnPostImage - Incoming request, ID: " + post.SessionId + ", payload: " + post.File.Length);
                string id = Cuid.Generate();
                StorageResult Result = await MinioHandler.UploadImage(BucketName, MakeStream(post.File), post.File.Length, id);
                Console.WriteLine("ImagesController:OnPostImage - Request successful, uploaded " + id);
                if (!Result.Success) response.Status = Status.Error;
                response.Body["reason"] = Result.Data;
                return response;
            }
            catch (UnauthorizedAccessException) {
                response.Status = Status.Error;
                response.Body["reason"] = "unauthorized";
                return response;
            }
        }

        [HttpPost("Download")]
        public async Task<GenericResponse> OnGetImage(ImageGet imageGet)
        {
            GenericResponse response = new GenericResponse();
            try
            {
                Session s = await Handler.GetSession(imageGet.SessionId);
                string res = null;
                await MinioHandler.GetImage(BucketName, imageGet.ImageId, (stream) =>
                {
                    StreamReader reader = new StreamReader(stream);
                    res = reader.ReadToEnd();
                });

                response.Body["image"] = res;
                return response;
            }
            catch (UnauthorizedAccessException)
            {
                response.Status = Status.Error;
                response.Body["reason"] = "unauthorized";
                return response;
            }

            catch (KeyNotFoundException)
            {
                response.Status = Status.Error;
                response.Body["reason"] = "Image not found!";
                return response;
            }
        }
    }
}