using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Localization;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Formats.Jpeg;
using System.IO;
using HeyRed.ImageSharp.Heif;

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

        public HeicToJpgController(IStringLocalizer<SharedResource> localizer, ILogger<HeicToJpgController> logger)
        {
            _localizer = localizer;
            _logger = logger;
        }

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

        private void PrepareIndexView()
        {
            SetCommonViewBagProperties();
            ViewBag.PageTitle = _localizer["HeicConverterPageTitle"];
            ViewBag.PageDescription = _localizer["HeicConverterPageDescription"];
            ViewBag.HeicToJpgTabTitle = _localizer["HeicToJpgTabTitle"];
            ViewBag.JpgToHeicTabTitle = _localizer["JpgToHeicTabTitle"];
            ViewBag.HeicFileInputLabel = _localizer["HeicFileInputLabel"];
            ViewBag.JpgFileInputLabel = _localizer["JpgFileInputLabel"];
            ViewBag.ConvertToJpgButton = _localizer["ConvertToJpgButton"];
            ViewBag.ConvertToHeicButton = _localizer["ConvertToHeicButton"];

            // FAQ properties
            ViewBag.FaqWhatTitle = _localizer["HeicFaqWhatTitle"];
            ViewBag.FaqWhatContent = _localizer["HeicFaqWhatContent"];
            ViewBag.FaqHowTitle = _localizer["HeicFaqHowTitle"];
            ViewBag.FaqHowContent = _localizer["HeicFaqHowContent"];
            ViewBag.FaqWhyTitle = _localizer["HeicFaqWhyTitle"];
            ViewBag.FaqWhyContent = _localizer["HeicFaqWhyContent"];
            ViewBag.FaqSecurityTitle = _localizer["HeicFaqSecurityTitle"];
            ViewBag.FaqSecurityContent = _localizer["HeicFaqSecurityContent"];
            ViewBag.FaqLimitsTitle = _localizer["HeicFaqLimitsTitle"];
            ViewBag.FaqLimitsContent = _localizer["HeicFaqLimitsContent"];
            ViewBag.MetaDescription = ViewBag.PageDescription;
        }

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

        [HttpPost]
        public async Task<IActionResult> ConvertHeicToJpg(IFormFile heicFile, bool preview = false)
        {
            if (heicFile == null || heicFile.Length == 0)
            {
                _logger.LogWarning("[HEIC-CONVERTER] Tentativa de conversão sem arquivo");
                if (preview)
                {
                    return Json(new { success = false, message = _localizer["SelectFileError"].Value });
                }
                ModelState.AddModelError("heicFile", _localizer["SelectFileError"]);
                PrepareIndexView();
                return View("Index");
            }

            var allowedTypes = new[] { "image/heic", "image/heif", "application/octet-stream" };
            if (!allowedTypes.Contains(heicFile.ContentType) && !heicFile.FileName.ToLower().EndsWith(".heic") && !heicFile.FileName.ToLower().EndsWith(".heif"))
            {
                _logger.LogWarning("[HEIC-CONVERTER] Arquivo inválido: {ContentType}", heicFile.ContentType);
                if (preview)
                {
                    return Json(new { success = false, message = _localizer["InvalidHeicFileError"].Value });
                }
                ModelState.AddModelError("heicFile", _localizer["InvalidHeicFileError"]);
                PrepareIndexView();
                return View("Index");
            }

            try
            {
                _logger.LogInformation("[HEIC-CONVERTER] Iniciando conversão HEIC→JPG: {FileName} ({Size} bytes)",
                    heicFile.FileName, heicFile.Length);

                var originalSize = heicFile.Length;

                // Limite para preview: 10MB
                const long maxPreviewSize = 10 * 1024 * 1024;

                using var heicStream = heicFile.OpenReadStream();
                using var image = await Image.LoadAsync(heicStream);

                using var memoryStream = new MemoryStream();
                await image.SaveAsJpegAsync(memoryStream);
                var jpegData = memoryStream.ToArray();
                var convertedSize = jpegData.Length;

                var fileName = Path.GetFileNameWithoutExtension(heicFile.FileName) + ".jpg";

                _logger.LogInformation("[HEIC-CONVERTER] Conversão HEIC→JPG concluída: {OutputFileName} (Original: {OriginalSize}bytes → Convertido: {ConvertedSize}bytes)",
                    fileName, originalSize, convertedSize);

                // Se é request de preview e o arquivo não é muito grande
                if (preview && originalSize <= maxPreviewSize && convertedSize <= maxPreviewSize)
                {
                    var base64 = Convert.ToBase64String(jpegData);
                    var base64DataUrl = $"data:image/jpeg;base64,{base64}";

                    return Json(new
                    {
                        success = true,
                        base64 = base64DataUrl,
                        filename = fileName,
                        originalSize = originalSize,
                        convertedSize = convertedSize
                    });
                }

                // Download normal (lógica original)
                return File(jpegData, "image/jpeg", fileName);
            }
            catch (UnknownImageFormatException)
            {
                _logger.LogWarning("[HEIC-CONVERTER] O arquivo HEIC parece ser inválido ou o formato não é suportado. Verifique se a biblioteca 'libheif' está instalada no sistema.");
                if (preview)
                {
                    return Json(new { success = false, message = _localizer["InvalidHeicFileError"].Value });
                }
                ModelState.AddModelError("heicFile", _localizer["InvalidHeicFileError"]);
                ViewBag.ConversionError = _localizer["InvalidHeicFileError"];
                PrepareIndexView();
                return View("Index");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "[HEIC-CONVERTER] Erro ao converter HEIC para JPG: {FileName}", heicFile.FileName);
                if (preview)
                {
                    return Json(new { success = false, message = _localizer["ProcessingError"].Value });
                }
                ModelState.AddModelError("heicFile", _localizer["ProcessingError"]);
                ViewBag.ConversionError = _localizer["ProcessingError"];
                PrepareIndexView();
                return View("Index");
            }
        }

        [HttpPost]
        public async Task<IActionResult> ConvertJpgToHeic(IFormFile jpgFile, bool preview = false)
        {
            if (jpgFile == null || jpgFile.Length == 0)
            {
                _logger.LogWarning("[HEIC-CONVERTER] Tentativa de conversão JPG→HEIC sem arquivo");
                if (preview)
                {
                    return Json(new { success = false, message = _localizer["SelectFileError"].Value });
                }
                ModelState.AddModelError("jpgFile", _localizer["SelectFileError"]);
                PrepareIndexView();
                return View("Index");
            }

            if (jpgFile.ContentType != "image/jpeg" && !jpgFile.FileName.ToLower().EndsWith(".jpg") && !jpgFile.FileName.ToLower().EndsWith(".jpeg"))
            {
                _logger.LogWarning("[HEIC-CONVERTER] Arquivo JPG inválido: {ContentType}", jpgFile.ContentType);
                if (preview)
                {
                    return Json(new { success = false, message = _localizer["InvalidJpgFileError"].Value });
                }
                ModelState.AddModelError("jpgFile", _localizer["InvalidJpgFileError"]);
                PrepareIndexView();
                return View("Index");
            }

            try
            {
                _logger.LogInformation("[HEIC-CONVERTER] Iniciando conversão JPG→HEIC: {FileName} ({Size} bytes)",
                    jpgFile.FileName, jpgFile.Length);

                var originalSize = jpgFile.Length;

                // Limite para preview: 10MB
                const long maxPreviewSize = 10 * 1024 * 1024;

                using var jpgStream = jpgFile.OpenReadStream();
                using var image = await Image.LoadAsync(jpgStream);

                using var memoryStream = new MemoryStream();

                // Salvar como HEIC usando o encoder disponível
                await image.SaveAsync(memoryStream, new HeyRed.ImageSharp.Heif.Formats.Heif.HeifEncoder());
                var heicData = memoryStream.ToArray();
                var convertedSize = heicData.Length;

                var fileName = Path.GetFileNameWithoutExtension(jpgFile.FileName) + ".heic";

                _logger.LogInformation("[HEIC-CONVERTER] Conversão JPG→HEIC concluída: {OutputFileName} (Original: {OriginalSize}bytes → Convertido: {ConvertedSize}bytes)",
                    fileName, originalSize, convertedSize);

                // Se é request de preview e o arquivo não é muito grande
                if (preview && originalSize <= maxPreviewSize && convertedSize <= maxPreviewSize)
                {
                    var base64 = Convert.ToBase64String(heicData);
                    var base64DataUrl = $"data:image/heic;base64,{base64}";

                    return Json(new
                    {
                        success = true,
                        base64 = base64DataUrl,
                        filename = fileName,
                        originalSize = originalSize,
                        convertedSize = convertedSize
                    });
                }

                // Download normal
                return File(heicData, "image/heic", fileName);
            }
            catch (UnknownImageFormatException)
            {
                _logger.LogWarning("[HEIC-CONVERTER] O arquivo JPG parece ser inválido ou o formato não é suportado.");
                if (preview)
                {
                    return Json(new { success = false, message = _localizer["InvalidJpgFileError"].Value });
                }
                ModelState.AddModelError("jpgFile", _localizer["InvalidJpgFileError"]);
                ViewBag.ConversionError = _localizer["InvalidJpgFileError"];
                PrepareIndexView();
                return View("Index");
            }
            catch (NotSupportedException)
            {
                _logger.LogWarning("[HEIC-CONVERTER] Conversão JPG→HEIC não é suportada pela biblioteca atual.");
                var errorMsg = "Conversão JPG→HEIC ainda não está disponível. A biblioteca não suporta encoding HEIC.";
                if (preview)
                {
                    return Json(new { success = false, message = errorMsg });
                }
                ModelState.AddModelError("jpgFile", errorMsg);
                ViewBag.ConversionError = errorMsg;
                PrepareIndexView();
                return View("Index");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "[HEIC-CONVERTER] Erro ao converter JPG para HEIC: {FileName}", jpgFile.FileName);
                if (preview)
                {
                    return Json(new { success = false, message = _localizer["ProcessingError"].Value });
                }
                ModelState.AddModelError("jpgFile", _localizer["ProcessingError"]);
                ViewBag.ConversionError = _localizer["ProcessingError"];
                PrepareIndexView();
                return View("Index");
            }
        }
    }
}