using System;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;

namespace ChatController.Utilities
{
    public class FileUtils
    {
        public static string ScaleImage(string pFile, string pFormat, long maxUploadSize)
        {
            var isImageFile = Constants.ImageFileExtensions.Contains(Path.GetExtension(pFile).ToUpperInvariant());

            if(!isImageFile)
            {
                return pFile;
            }

            byte[] mediaFile;
            using(Stream reader = File.OpenRead(pFile))
            {
                mediaFile = Utils.ReadFully(reader);
            }

            var memoryStream = new MemoryStream(mediaFile);
            var image = Image.FromStream(memoryStream);

            float width, height;

            if(image.Height < image.Width)
            {
                if(image.Height > 1080)
                {
                    var factor = (float)image.Height / 1080;

                    height = 1080;

                    width = image.Width / factor;
                }
                else
                {
                    return pFile;
                }
            }
            else if(image.Height < 1080 && image.Width < 1080)
            {
                return pFile;
            }
            else
            {
                if(image.Width > 1080)
                {
                    var factor = (float)image.Width / 1080;

                    width = 1080;

                    height = image.Height / factor;
                }
                else
                {
                    return pFile;
                }
            }

            var scaledBitmap = new Bitmap(image, new Size((int)width, (int)height));

            const int orientationId = 0x0112;

            if(image.PropertyIdList.Contains(orientationId))
            {
                var item = image.GetPropertyItem(orientationId);

                scaledBitmap.SetPropertyItem(item);
            }

            using(var graphics = Graphics.FromImage(image))
            {
                graphics.Clear(Color.Transparent);

                graphics.InterpolationMode = InterpolationMode.Low;

                graphics.DrawImage(scaledBitmap, (int)width, (int)height);
            }

            // tmp_img_owch_
            var filePath = $"{Path.GetTempPath()}{Guid.NewGuid()}_tmp_img_owch{pFormat}";

            if(pFormat.Equals(".JPG") || pFormat.Equals(".JPE") || pFormat.Equals(".JPEG") || pFormat.Equals(".BMP"))
            {
                scaledBitmap.Save(filePath, ImageFormat.Jpeg);
            }
            else if(pFormat.Equals(".PNG"))
            {
                scaledBitmap.Save(filePath, ImageFormat.Png);
            }
            else if(pFormat.Equals(".GIF"))
            {
                scaledBitmap.Save(filePath, ImageFormat.Gif);
            }

            if(File.Exists(filePath))
            {
                var fileInfo = new FileInfo(filePath);
                var fileInfoLength = fileInfo.Length;

                if(maxUploadSize < fileInfoLength)
                {
                    File.Delete(filePath);
                    return string.Empty;
                }
            }
            else
            {
                return string.Empty;
            }

            memoryStream.Dispose();
            memoryStream.Close();

            return filePath;
        }
        
        public static bool CheckFileSize(string pathToFile, long maxFileSize)
        {
            var fileInfo = new FileInfo(pathToFile);
            
            return fileInfo.Length > maxFileSize;
        }

        public static bool IsFileLocked(string path)
        {
            if(!File.Exists(path))
            {
                return false;
            }

            try
            {
                var file = new FileInfo(path);

                using (var stream = file.Open(FileMode.Open, FileAccess.Read, FileShare.None))
                {
                    stream.Close();
                }
            }
            catch(IOException ioException)
            {
                Debug.WriteLine($"Error (FileUtils.IsFileLocked): {ioException.Message}");
                return true;
            }

            return false;
        }
    }
}