using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Localization;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Formats.Webp;

namespace Convert_It_Online.Areas.ImageConverters.Controllers
{
    [Area("ImageConverters")]
    public class JpgToWebpController : Controller
    {
        private readonly IStringLocalizer<SharedResource> _localizer;

        public JpgToWebpController(IStringLocalizer<SharedResource> localizer)
        {
            _localizer = localizer;
        }

        private void SetCommonViewBagProperties()
        {
            ViewBag.HomeLink = _localizer["HomeLink"];
            ViewBag.TextMenuTitle = _localizer["TextMenuTitle"];
            ViewBag.ImageMenuTitle = _localizer["ImageMenuTitle"];
            ViewBag.CaseConverterTitle = _localizer["CaseConverterTitle"];
            ViewBag.JpgToWebpTitle = _localizer["JpgToWebpTitle"];
            ViewBag.FooterText = _localizer["FooterText"];
            ViewBag.About = _localizer["About"];
            ViewBag.Contact = _localizer["Contact"];
            ViewBag.Terms = _localizer["Terms"];
        }

        public IActionResult Index()
        {
            SetCommonViewBagProperties();
            ViewBag.PageTitle = _localizer["ImageConverterPageTitle"];
            ViewBag.PageDescription = _localizer["ImageConverterPageDescription"];
            ViewBag.FileInputLabel = _localizer["FileInputLabel"];
            ViewBag.ConvertButton = _localizer["ConvertButton"];
            
            return View();
        }

        [HttpPost]
        public async Task<IActionResult> Convert(IFormFile jpgFile)
        {
            if (jpgFile == null || jpgFile.Length == 0)
            {
                ModelState.AddModelError("jpgFile", "Por favor, selecione um arquivo.");
                return View("Index");
            }

            // Validação simples do tipo de arquivo
            if (jpgFile.ContentType != "image/jpeg")
            {
                ModelState.AddModelError("jpgFile", "Arquivo inválido. Por favor, envie um arquivo JPG.");
                return View("Index");
            }

            try
            {
                using var imageStream = jpgFile.OpenReadStream();
                using var image = await Image.LoadAsync(imageStream);
                
                using var memoryStream = new MemoryStream();
                await image.SaveAsync(memoryStream, new WebpEncoder());
                memoryStream.Position = 0;

                var fileName = Path.GetFileNameWithoutExtension(jpgFile.FileName) + ".webp";
                return File(memoryStream.ToArray(), "image/webp", fileName);
            }
            catch (Exception)
            {
                // Log do erro (não implementado aqui)
                ModelState.AddModelError("jpgFile", "Ocorreu um erro ao processar a imagem.");
                return View("Index");
            }
        }
    }
}