/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2013  Thomas Braun, Jens Klingen, Robin Krom
 *
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

using GreenshotPlugin;
using GreenshotPlugin.Core;
using System;
using System.Drawing;
using System.Drawing.Imaging;

namespace Greenshot.Core
{
    /// <summary>
    /// Interface to describe an effect
    /// </summary>
    public interface IEffect
    {
        Image Apply(Image sourceImage, out Point offsetChange);
    }

    /// <summary>
    /// DropShadowEffect
    /// </summary>
    public class DropShadowEffect : IEffect
    {
        public DropShadowEffect()
        {
            Darkness = 0.6f;
            ShadowSize = 9;
            ShadowOffset = new Point(0, 0);
        }

        public float Darkness
        {
            get;
            set;
        }
        public int ShadowSize
        {
            get;
            set;
        }
        public Point ShadowOffset
        {
            get;
            set;
        }

        public virtual Image Apply(Image sourceImage, out Point offsetChange)
        {
            return ImageHelper.CreateShadow(sourceImage, Darkness, ShadowSize, ShadowOffset, out offsetChange, PixelFormat.Format32bppArgb);
        }
    }

    /// <summary>
    /// TornEdgeEffect extends on DropShadowEffect
    /// </summary>
    public class TornEdgeEffect : DropShadowEffect
    {
        public TornEdgeEffect()
            : base()
        {
            ShadowSize = 7;
            ToothHeight = 12;
            HorizontalToothRange = 20;
            VerticalToothRange = 20;
        }

        public int ToothHeight
        {
            get;
            set;
        }
        public int HorizontalToothRange
        {
            get;
            set;
        }
        public int VerticalToothRange
        {
            get;
            set;
        }

        public override Image Apply(Image sourceImage, out Point offsetChange)
        {
            using (Image tmpTornImage = ImageHelper.CreateTornEdge(sourceImage, ToothHeight, HorizontalToothRange, VerticalToothRange))
            {
                return ImageHelper.CreateShadow(tmpTornImage, Darkness, ShadowSize, ShadowOffset, out offsetChange, PixelFormat.Format32bppArgb);
            }
        }
    }

    /// <summary>
    /// GrayscaleEffect
    /// </summary>
    public class GrayscaleEffect : IEffect
    {
        public Image Apply(Image sourceImage, out Point offsetChange)
        {
            offsetChange = Point.Empty;
            return ImageHelper.CreateGrayscale(sourceImage);
        }
    }

    /// <summary>
    /// MonochromeEffect
    /// </summary>
    public class MonochromeEffect : IEffect
    {
        private byte threshold;

        /// <param name="threshold">Threshold for monochrome filter (0 - 255), lower value means less black</param>
        public MonochromeEffect(byte threshold)
        {
            this.threshold = threshold;
        }

        public Image Apply(Image sourceImage, out Point offsetChange)
        {
            offsetChange = Point.Empty;
            return ImageHelper.CreateMonochrome(sourceImage, threshold);
        }
    }

    /// <summary>
    /// AdjustEffect
    /// </summary>
    public class AdjustEffect : IEffect
    {
        public AdjustEffect()
            : base()
        {
            Contrast = 1f;
            Brightness = 1f;
            Gamma = 1f;
        }

        public float Contrast
        {
            get;
            set;
        }
        public float Brightness
        {
            get;
            set;
        }
        public float Gamma
        {
            get;
            set;
        }

        public Image Apply(Image sourceImage, out Point offsetChange)
        {
            offsetChange = Point.Empty;
            return ImageHelper.Adjust(sourceImage, Brightness, Contrast, Gamma);
        }
    }

    /// <summary>
    /// ReduceColorsEffect
    /// </summary>
    public class ReduceColorsEffect : IEffect
    {
        public ReduceColorsEffect()
            : base()
        {
            Colors = 256;
        }

        public int Colors
        {
            get;
            set;
        }

        public Image Apply(Image sourceImage, out Point offsetChange)
        {
            offsetChange = Point.Empty;
            using (WuQuantizer quantizer = new WuQuantizer((Bitmap)sourceImage))
            {
                int colorCount = quantizer.GetColorCount();
                if (colorCount > Colors)
                {
                    try
                    {
                        return quantizer.GetQuantizedImage(Colors);
                    }
                    catch (Exception e)
                    {
                        LOG.Warn("Error occurred while Quantizing the image, ignoring and using original. Error: ", e);
                    }
                }
            }
            return null;
        }
    }

    /// <summary>
    /// InvertEffect
    /// </summary>
    public class InvertEffect : IEffect
    {
        public Image Apply(Image sourceImage, out Point offsetChange)
        {
            offsetChange = Point.Empty;
            return ImageHelper.CreateNegative(sourceImage);
        }
    }

    /// <summary>
    /// BorderEffect
    /// </summary>
    public class BorderEffect : IEffect
    {
        public BorderEffect()
        {
            Width = 2;
            Color = Color.Black;
        }

        public Color Color
        {
            get;
            set;
        }
        public int Width
        {
            get;
            set;
        }

        public Image Apply(Image sourceImage, out Point offsetChange)
        {
            return ImageHelper.CreateBorder(sourceImage, Width, Color, sourceImage.PixelFormat, out offsetChange);
        }
    }

    /// <summary>
    /// RotateEffect
    /// </summary>
    public class RotateEffect : IEffect
    {
        public RotateEffect(int angle)
        {
            Angle = angle;
        }

        public int Angle
        {
            get;
            set;
        }

        public Image Apply(Image sourceImage, out Point offsetChange)
        {
            offsetChange = Point.Empty;
            RotateFlipType flipType;
            if (Angle == 90)
            {
                flipType = RotateFlipType.Rotate90FlipNone;
            }
            else if (Angle == -90 || Angle == 270)
            {
                flipType = RotateFlipType.Rotate270FlipNone;
            }
            else
            {
                throw new NotSupportedException("Currently only an angle of 90 or -90 (270) is supported.");
            }
            return ImageHelper.RotateFlip(sourceImage, flipType);
        }
    }

    /// <summary>
    /// ResizeEffect
    /// </summary>
    public class ResizeEffect : IEffect
    {
        public ResizeEffect(int width, int height, bool maintainAspectRatio)
        {
            Width = width;
            Height = height;
            MaintainAspectRatio = maintainAspectRatio;
        }

        public int Width
        {
            get;
            set;
        }
        public int Height
        {
            get;
            set;
        }
        public bool MaintainAspectRatio
        {
            get;
            set;
        }

        public Image Apply(Image sourceImage, out Point offsetChange)
        {
            offsetChange = Point.Empty;
            return ImageHelper.ResizeImage(sourceImage, MaintainAspectRatio, Width, Height);
        }
    }

    /// <summary>
    /// ResizeCanvasEffect
    /// </summary>
    public class ResizeCanvasEffect : IEffect
    {
        public ResizeCanvasEffect(int left, int right, int top, int bottom)
        {
            Left = left;
            Right = right;
            Top = top;
            Bottom = bottom;
            BackgroundColor = Color.Empty;	// Uses the default background color depending on the format
        }

        public int Left
        {
            get;
            set;
        }
        public int Right
        {
            get;
            set;
        }
        public int Top
        {
            get;
            set;
        }
        public int Bottom
        {
            get;
            set;
        }
        public Color BackgroundColor
        {
            get;
            set;
        }

        public Image Apply(Image sourceImage, out Point offsetChange)
        {
            // Make sure the elements move according to the offset the effect made the bitmap move
            offsetChange = new Point(Left, Top);
            return ImageHelper.ResizeCanvas(sourceImage, BackgroundColor, Left, Right, Top, Bottom);
        }
    }
}