#region ================== Namespaces

using System;
using System.Drawing;
using System.IO;
using CodeImp.DoomBuilder.Geometry;
using CodeImp.DoomBuilder.IO;

#endregion

namespace CodeImp.DoomBuilder.Data
{
	public sealed class HiResImage : ImageData
	{
		#region ================== Variables

		private Vector2D sourcescale;
		private Size sourcesize;
		private bool overridesettingsapplied;

		#endregion

		#region ================== Properties

		public override int Width { get { return sourcesize.Width; } }
		public override int Height { get { return sourcesize.Height; } }
		public override float ScaledWidth { get { return (float)Math.Round(sourcesize.Width * sourcescale.x); } }
		public override float ScaledHeight { get { return (float)Math.Round(sourcesize.Height * sourcescale.y); } }
		public override Vector2D Scale { get { return sourcescale; } }

		#endregion

		#region ================== Constructor / Disposer

		public HiResImage(string name)
		{
			// Initialize
			this.scale.x = General.Map.Config.DefaultTextureScale;
			this.scale.y = General.Map.Config.DefaultTextureScale;
			this.sourcescale = scale;
			this.sourcesize = Size.Empty;
			SetName(name);

			// biwa. HiRes replacements always seem to use worldpanning. There is no documentation about it, but not
			// setting it can cause issues (see https://github.com/jewalky/UltimateDoomBuilder/issues/432)
			worldpanning = true;

			// We have no destructor
			GC.SuppressFinalize(this);
		}

		// Copy constructor
		public HiResImage(HiResImage other)
		{
			// Initialize
			this.scale = other.scale;
			this.sourcescale = other.sourcescale;
			this.sourcesize = other.sourcesize;

			// biwa. HiRes replacements always seem to use worldpanning. There is no documentation about it, but not
			// setting it can cause issues (see https://github.com/jewalky/UltimateDoomBuilder/issues/432)
			worldpanning = true;

			// Copy names
			this.name = other.name;
			this.filepathname = other.filepathname;
			this.virtualname = other.virtualname;
			this.displayname = other.displayname;
			this.shortname = other.shortname;
			this.longname = other.longname;

			// We have no destructor
			GC.SuppressFinalize(this);
		}

		#endregion

		#region ================== Methods

		protected override void SetName(string name)
		{
			name = name.Replace(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);

			this.filepathname = name;
			this.name = Path.GetFileNameWithoutExtension(name.ToUpperInvariant());
			if(this.name.Length > DataManager.CLASIC_IMAGE_NAME_LENGTH)
			{
				this.name = this.name.Substring(0, DataManager.CLASIC_IMAGE_NAME_LENGTH);
			}
			this.virtualname = this.name;
			this.displayname = this.name;
			this.shortname = this.name;
			this.longname = Lump.MakeLongName(this.name);

			ComputeNamesWidth(); // biwa
		}

		internal void ApplySettings(ImageData overridden)
		{
			// Copy relevant names...
			name = overridden.Name;
			virtualname = overridden.VirtualName;
			displayname = overridden.DisplayName;

			texturenamespace = overridden.TextureNamespace;
			hasLongName = overridden.HasLongName;
			overridesettingsapplied = true;

			overridden.LoadImageNow();
			if(overridden.ImageState == ImageLoadState.Ready)
			{
				// Store source properteis
				sourcesize = new Size(overridden.Width, overridden.Height);
				sourcescale = overridden.Scale;
				offsetx = overridden.OffsetX;
				offsety = overridden.OffsetY;
			}
		}

		// This loads the image
		protected override LocalLoadResult LocalLoadImage()
		{
            // Get the patch data stream
            Bitmap bitmap = null;
            string error = null;
			string sourcelocation = string.Empty;
			Stream data = General.Map.Data.GetHiResTextureData(shortname, ref sourcelocation);
			if(data != null)
			{
				// Copy patch data to memory
				byte[] membytes = new byte[(int)data.Length];

				lock(data) //mxd
				{
					data.Seek(0, SeekOrigin.Begin);
					data.Read(membytes, 0, (int)data.Length);
				}
					
				MemoryStream mem = new MemoryStream(membytes);
				mem.Seek(0, SeekOrigin.Begin);

				bitmap = ImageDataFormat.TryLoadImage(mem, (texturenamespace == TextureNamespace.FLAT) ? ImageDataFormat.DOOMFLAT : ImageDataFormat.DOOMPICTURE, General.Map.Data.Palette);

				// Not loaded?
				if(bitmap == null)
				{
					error = "Image lump \"" + Path.Combine(sourcelocation, filepathname.Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar)) + "\" data format could not be read, while loading HiRes texture \"" + this.Name + "\". Does this lump contain valid picture data at all?";
				}

				// Done
				mem.Dispose();
			}
			else
			{
				error = "Image lump \"" + shortname + "\" could not be found, while loading HiRes texture \"" + this.Name + "\". Did you forget to include required resources?";
			}

            return new LocalLoadResult(bitmap, error, () =>
            {
                // Apply source overrides?
                if (!sourcesize.IsEmpty)
                {
                    scale = new Vector2D(ScaledWidth / width, ScaledHeight / height);
                }
                else
                {
                    if (overridesettingsapplied)
                        General.ErrorLogger.Add(ErrorType.Warning, "Unable to get source texture dimensions while loading HiRes texture \"" + this.Name + "\".");

                    // Use our own size...
                    sourcesize = new Size(width, height);
                }
            });
        }

        #endregion
    }
}
