/*

 * Copyright (c) 2015, Jason Maltzen

 Permission is hereby granted, free of charge, to any person obtaining a copy

 of this software and associated documentation files (the "Software"), to deal

 in the Software without restriction, including without limitation the rights

 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 copies of the Software, and to permit persons to whom the Software is

 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in

 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 THE SOFTWARE.

*/

using System;

using System.IO;

namespace DesertPaintLab

{

    // ReactionRecorder - business logic for recording paint reactions

    public class ReactionRecorder

    {

        const int COLOR_TOLERANCE = 3;

        const int DEFAULT_SWATCH_HEIGHT = 24; // including top and bottom borders

        const int DEFAULT_RED_BAR_SPACING = 32;

        const int DEFAULT_GREEN_BAR_SPACING = 42;

        const int DEFAULT_BLUE_BAR_SPACING = 52;

        const int DEFAULT_SWATCH_TEST_WIDTH = 26; // width to test on ends of swatch (10% on either end)

        int swatchHeight = DEFAULT_SWATCH_HEIGHT;

        int swatchWidth = DEFAULT_SWATCH_WIDTH;

        int swatchTestWidth = DEFAULT_SWATCH_TEST_WIDTH;

        int colorBarWidth = DEFAULT_COLOR_BAR_WIDTH;

        int redBarSpacing = DEFAULT_RED_BAR_SPACING;

        int greenBarSpacing = DEFAULT_GREEN_BAR_SPACING;

        int blueBarSpacing = DEFAULT_BLUE_BAR_SPACING;

        int pixelMultiplier = 1;

        bool firstRun = true;

        int lastSwatchX = -1;

        int lastSwatchY = -1;

        private static ReactionRecorder _instance;

        public static ReactionRecorder Instance

        {

            get {

                if (_instance == null)

                {

                    _instance = new ReactionRecorder();

                }

                return _instance;

            }

        }

        private StreamWriter _log;

        public StreamWriter Log

        {

            set

            {

                _log = value;

            }

        }

        private void WriteLog(string format, params object[] args)

        {

            if (_log != null)

            {

                _log.WriteLine(format, args);

            }

        }

        public ReactionRecorder()

        {

            this.pixelMultiplier = 1;

            swatchHeight = DEFAULT_SWATCH_HEIGHT * pixelMultiplier;

            swatchWidth = DEFAULT_SWATCH_WIDTH * pixelMultiplier;

            colorBarWidth = DEFAULT_COLOR_BAR_WIDTH * pixelMultiplier;

            redBarSpacing = DEFAULT_RED_BAR_SPACING * pixelMultiplier;

            greenBarSpacing = DEFAULT_GREEN_BAR_SPACING * pixelMultiplier;

            blueBarSpacing = DEFAULT_BLUE_BAR_SPACING * pixelMultiplier;

            swatchTestWidth = DEFAULT_SWATCH_TEST_WIDTH * pixelMultiplier;

        }

        public ReactionRecorder(int pixelMultiplier)

        {

            this.pixelMultiplier = pixelMultiplier;

            swatchHeight = DEFAULT_SWATCH_HEIGHT * pixelMultiplier;

            swatchWidth = DEFAULT_SWATCH_WIDTH * pixelMultiplier;

            colorBarWidth = DEFAULT_COLOR_BAR_WIDTH * pixelMultiplier;

            redBarSpacing = DEFAULT_RED_BAR_SPACING * pixelMultiplier;

            greenBarSpacing = DEFAULT_GREEN_BAR_SPACING * pixelMultiplier;

            blueBarSpacing = DEFAULT_BLUE_BAR_SPACING * pixelMultiplier;

            swatchTestWidth = DEFAULT_SWATCH_TEST_WIDTH * pixelMultiplier;

        }

        private static bool IsPapyTexture(byte r, byte g, byte b)

        {

            // red between 208 and 244

            // green between 192 and 237

            // blue between 145 and 205

            return ((r > 0xD0) && (g >= 0xC0) && (b >= 0x91)) &&

                   ((r < 0xF4) && (g <= 0xED) && (b <= 0xCD));

        }

        public void SetPixelMultiplier(int pixelMultiplier)

        {

            swatchHeight    = DEFAULT_SWATCH_HEIGHT * pixelMultiplier;

            swatchWidth     = DEFAULT_SWATCH_WIDTH * pixelMultiplier;

            colorBarWidth   = DEFAULT_COLOR_BAR_WIDTH * pixelMultiplier;

            redBarSpacing   = DEFAULT_RED_BAR_SPACING * pixelMultiplier;

            greenBarSpacing = DEFAULT_GREEN_BAR_SPACING * pixelMultiplier;

            blueBarSpacing  = DEFAULT_BLUE_BAR_SPACING * pixelMultiplier;

            swatchTestWidth = DEFAULT_SWATCH_TEST_WIDTH * pixelMultiplier;

            this.pixelMultiplier = pixelMultiplier;

        }

        unsafe private void ColorAt(byte *pixBytes, int x, int y, int stride, out byte r, out byte g, out byte b)

        {

            int pixelStart = (y * stride) + (x * 3);

                    r = pixBytes[pixelStart];