using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace ZUGFeRDRESTService.Controllers
{    
    [Route("api/[controller]")]
    [ApiController]
    public class ZugferdValidationController : ControllerBase
    {
        public static string RESPONSE_OK = "OK";
        public static string RESPONSE_ERROR = "ERROR";

        private readonly IZugferdValidationDataService _dataService;

        public class ZugferdValidationResponse
        {
            public string status;
            public string message;
            public List<string> errors;

            

            public ZugferdValidationResponse()
            {
                status = RESPONSE_OK;
                message = String.Empty;
                errors = new List<string>();
            }
        }

        public ZugferdValidationController(IZugferdValidationDataService dataService)
        {
            _dataService = dataService;
        }

        /// <summary>
        /// POST: api/ZugferdValidation
        /// </summary>
        /// <param name="files">This parameter's name needs to correspond to the html form's file-input name</param>
        [HttpPost]
        public async Task<ZugferdValidationResponse> Post(List<IFormFile> files)
        {
            var oFilePaths = new List<String>();
            var oFileNames = new List<String>();

            if (files.Count == 0) {
                return new ZugferdValidationResponse()
                {
                    status = RESPONSE_ERROR,
                    message = "No File received!"
                };
            }

            foreach (var formFile in files)
            {
                var oFilePath = Path.GetTempFileName();
                oFilePaths.Add(oFilePath);
                oFileNames.Add(formFile.FileName);

                using (var oStream = new FileStream(oFilePath, FileMode.Create))
                {
                    await formFile.CopyToAsync(oStream);
                }
            }

            var oResponse = new ZugferdValidationResponse
            {
                message = "You uploaded the following file: " + oFileNames.First()
            };

            return oResponse;
        }
    }
}