/*

 * 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.Collections.Generic;

namespace DesertPaintLab

{

    public class PaintRecipe

    {

        public struct RGB

        {

            public int r;

            public int g;

            public int b;

        };

        public class RecipeIngredient

        {

            public string name;

            public uint quantity;

            public RecipeIngredient(string name, uint quantity)

            {

                this.name = name;

                this.quantity = quantity;

            }

        };

        private List<RecipeIngredient> recipe = new List<RecipeIngredient>();

        private List<string> reagents = new List<string>();

        private bool dirty = false;

        private PaintColor reactedColor = new PaintColor();

        private PaintColor baseColor = new PaintColor();

        private ReactionSet reactions;

        public PaintRecipe()

        {

        }

        public List<RecipeIngredient> Ingredients

        {

            get {

                return recipe;

            }

        }

        public ReactionSet Reactions

        {

            get

            {

                return reactions;

            }

            set

            {

                dirty = true;

                reactions = value;

            }

        }

        public PaintColor ReactedColor

        {

            get

            {

                if (dirty)

                {

                    ComputeBaseColor();

                    ComputeReactedColor();

                    dirty = false;

                }

                return reactedColor;

            }

        }

        public PaintColor BaseColor

        {

            get

            {

                if (dirty)

                {

                    ComputeBaseColor();

                    ComputeReactedColor();

                    dirty = false;

                }

                return baseColor;

            }

        }

        public void AddReagent(String reagentName)

        {

            AddReagent(reagentName, 1);

        }

        public void AddReagent(String reagentName, uint quantity)

        {

            if (quantity == 0)

            {

                return;

            }

            Reagent reagent = ReagentManager.GetReagent(reagentName);

            if (reagent == null)

            {

                Console.WriteLine("ERROR: invalid reagent {0}", reagentName);

                return;

            }

            RecipeIngredient ingredient = recipe.Find(x => x.name.Equals(reagentName));

            if (ingredient != null)

            {

                if (!reagent.IsCatalyst)

                {

                    ingredient.quantity += quantity;

                    dirty = true;

                }

            }

            else

            {

                RecipeIngredient newIngredient = new RecipeIngredient(reagentName, reagent.IsCatalyst ? 1 : quantity);

                recipe.Add(newIngredient);

                dirty = true;

            }

            reagents.Add(reagentName);

        }

        public void Clear()

        {

            reagents.Clear();

            recipe.Clear();

        }

        byte CalculateColor(int baseSum, uint pigmentCount, int reactSum)

        {

            // Changed to Math.Floor from Math.Round, since Round appears to be incorrect.

            return (byte)Math.Max(Math.Min(Math.Floor((((float)baseSum / (float)pigmentCount) + (float)reactSum)), 255), 0);

        }

        // Compute the color including reactions based on the player's profile

        private void ComputeReactedColor()

        {

            RGB baseRGB;

            baseRGB.r = 0;

            baseRGB.g = 0;

            baseRGB.b = 0;

            RGB reactionColor;

            reactionColor.r = 0;

            reactionColor.g = 0;

            reactionColor.b = 0;

            uint pigmentCount = 0;

            // track visited reagents so the reaction is only applied once

            SortedDictionary<string,bool> reagentSet = new SortedDictionary<string,bool>();

            List<Reagent> prevReagents = new List<Reagent>();

            foreach (RecipeIngredient ingredient in recipe)

            {

                string reagentName = ingredient.name;

                if (reagentName == null)

                {

                    continue;   

                }

                Reagent reagent = ReagentManager.GetReagent(reagentName);

                if (!reagent.IsCatalyst)

                {

                    baseRGB.r += (reagent.Color.Red * (int)ingredient.quantity);

                    baseRGB.g += (reagent.Color.Green * (int)ingredient.quantity);

                    baseRGB.b += (reagent.Color.Blue * (int)ingredient.quantity);

                    pigmentCount += ingredient.quantity;

                }

                if (!reagentSet.ContainsKey(reagentName) && reagentSet.Count <= 4)

                {

                    reagentSet[reagentName] = true;

                    // Run reactions.

                    foreach (Reagent otherReagent in prevReagents)

                    {

                        Reaction reaction = reactions.Find(otherReagent, reagent);

                        if (reaction != null)

                        {

                            reactionColor.r += reaction.Red;

                            reactionColor.g += reaction.Green;

                            reactionColor.b += reaction.Blue;

                        }

                    }

                    prevReagents.Add(reagent);

                }

            }

            reactedColor.Red = CalculateColor(baseRGB.r, pigmentCount, reactionColor.r);

            reactedColor.Green = CalculateColor(baseRGB.g, pigmentCount, reactionColor.g);

            reactedColor.Blue = CalculateColor(baseRGB.b, pigmentCount, reactionColor.b);

        }

        // Compute the base color without any reactions

        private void ComputeBaseColor()

        {

            RGB baseRGB;

            baseRGB.r = 0;

            baseRGB.g = 0;

            baseRGB.b = 0;

            uint pigmentCount = 0;

            foreach (RecipeIngredient ingredient in recipe)

            {

                string reagentName = ingredient.name;

                if (reagentName == null)

                {

                    continue;   

                }

                Reagent reagent = ReagentManager.GetReagent(reagentName);

                if (!reagent.IsCatalyst)

                {

                    baseRGB.r += (reagent.Color.Red * (int)ingredient.quantity);

                    baseRGB.g += (reagent.Color.Green * (int)ingredient.quantity);

                    baseRGB.b += (reagent.Color.Blue * (int)ingredient.quantity);

                    pigmentCount += ingredient.quantity;

                }

            }

            baseColor.Red = CalculateColor(baseRGB.r, pigmentCount, 0);

            baseColor.Green = CalculateColor(baseRGB.g, pigmentCount, 0);

            baseColor.Blue = CalculateColor(baseRGB.b, pigmentCount, 0);

        }

        // Compute the base color without any reactions

        public uint Cost

        {

            get {

                uint cost = 0;

                foreach (RecipeIngredient ingredient in recipe)

                {

                    string reagentName = ingredient.name;

                    if (reagentName == null)

 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.Collections.Generic;

namespace DesertPaintLab

{

    public partial class RecipeGeneratorWindow : Gtk.Window

    {

        RecipeGenerator generator;

        PlayerProfile profile;

        bool canceling = false;

        bool running = false;

        static Gtk.ListStore colorStore = new Gtk.ListStore(typeof(string));

        List<KeyValuePair<string, string>> missingReactions = new List<KeyValuePair<string, string>>();

        long lastProgressUpdate;

        long lastStatusUpdate;

        static public Gtk.ListStore RecipeModel

        {

            get

            {

                return colorStore;   

            }

        }

        public RecipeGeneratorWindow(PlayerProfile profile) : base(Gtk.WindowType.Toplevel)

        {

            this.profile = profile;

            this.Build();

            maxIngredientsSpinButton.Value = 5; // TODO: read/save profile info

            maxRecipeSpinButton.Value = 20; // TODO: read/save profile info

            fullQuantitySpinButton.Value = 20; // TODO: read/save profile info

            fullQuantityDepthSpinButton.Value = 4; // TODO: read/save profile info

            fullQuantityDepthSpinButton.SetRange(0, ReagentManager.Names.Count);

            maxIngredientsSpinButton.SetRange(0, ReagentManager.Names.Count);

            Gtk.TreeViewColumn recipeColorColumn = new Gtk.TreeViewColumn();

            Gtk.CellRendererText recipeColumnCell = new Gtk.CellRendererText();

            recipeColorColumn.PackStart(recipeColumnCell, true);       

            recipeColorColumn.Title = "Color";

            recipeList.AppendColumn(recipeColorColumn);

            recipeColorColumn.AddAttribute(recipeColumnCell, "text", 0);

            colorStore.SetSortColumnId(0, Gtk.SortType.Ascending);

            recipeList.Model = RecipeModel;

            recipeList.Selection.Changed += OnColorSelected;

            profile.LoadRecipes();

            // init UI

            foreach (string key in profile.Recipes.Keys)

            {

                colorStore.AppendValues(key);

            }

            countLabel.Text = String.Format("{0} / {1}", profile.Recipes.Count, Palette.Count);

            canceling = false;

            running = false;

        }

        protected void OnMaxIngredientsChanged(object sender, EventArgs e)

        {

            // TODO: save profile setting

            // TODO: no longer permit resume

        }

        protected void OnMaxRecipeChanged(object sender, EventArgs e)

        {

            // TODO: save profile setting

            // TODO: no longer permit resume

        }

        protected void OnFullQuantityDepthChanged(object sender, EventArgs e)

        {

            // TODO: save profile setting

            // TODO: no longer permit resume

        }

        protected void OnFullQuantityChanged(object sender, EventArgs e)

        {

            // TODO: save profile setting

            // TODO: no longer permit resume

        }

        protected void OnBegin(object sender, EventArgs e)

        {

            maxIngredientsSpinButton.Sensitive = false;

            ExportAction.Sensitive = false;

            SettingsAction.Sensitive = false;

            maxRecipeSpinButton.Sensitive = false;

            beginButton.Sensitive = false; // TODO: change to "pause"?

            stopResumeButton.Sensitive = true;

            fullQuantitySpinButton.Sensitive = false;

            fullQuantityDepthSpinButton.Sensitive = false;

            generator = new RecipeGenerator();

            generator.InitRecipes(profile.Recipes, profile.Reactions);

            countLabel.Text = String.Format("{0} / {1}", generator.Recipes.Count, Palette.Count);

            generator.Progress += OnProgress;

            generator.Finished += OnFinished;

            generator.NewRecipe += OnNewRecipe;

            // TODO: hook up event notifications

            // - progress

            // - complete

            // - new recipe / recipe update

            // Total recipe search count

            //int current = ReagentManager.Names.Count;

            //long recipePermutations = 1;

            //for (int i = 0; i < maxIngredientsSpinButton.ValueAsInt; ++i)

            //{

            //    recipePermutations *= current;

            //    --current;

            //}

            //System.Console.WriteLine("Will search {0} reagent permutations.", recipePermutations);

            lastProgressUpdate = DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond;

            lastStatusUpdate = lastProgressUpdate;

            running = true;

            stopResumeButton.Label = "Stop";

            generator.BeginRecipeGeneration(profile.Reactions, (uint)maxRecipeSpinButton.ValueAsInt, (uint)maxIngredientsSpinButton.ValueAsInt, (uint)fullQuantityDepthSpinButton.ValueAsInt, (uint)fullQuantitySpinButton.ValueAsInt);

        }

        protected void OnStopResume(object sender, EventArgs e)

        {

            if (generator != null)

            {

                if (running)

                {

                    canceling = true;

                    generator.Stop();

                }

                else

                {

                    // this must be a resume

                    lastProgressUpdate = DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond;

                    lastStatusUpdate = lastProgressUpdate;

                    canceling = false;

                    running = true;

                    stopResumeButton.Label = "Stop";

                    generator.BeginRecipeGeneration(profile.Reactions, (uint)maxRecipeSpinButton.ValueAsInt, (uint)maxIngredientsSpinButton.ValueAsInt, (uint)fullQuantityDepthSpinButton.ValueAsInt, (uint)fullQuantitySpinButton.ValueAsInt);

                }

            }

        }

        protected void OnFinished(object sender, EventArgs args)

        {

            Gtk.Application.Invoke(delegate {

                running = false;

                beginButton.Sensitive = true;

                ExportAction.Sensitive = true;

                SettingsAction.Sensitive = true;

                stopResumeButton.Sensitive = false;

                maxIngredientsSpinButton.Sensitive = true;

                maxRecipeSpinButton.Sensitive = true;

                fullQuantitySpinButton.Sensitive = true;

                fullQuantityDepthSpinButton.Sensitive = true;

                //generator = null; // don't. Hang on to generator for resume.

                profile.SaveRecipes();

                if (canceling)

                {

                    stopResumeButton.Label = "Resume";

                    stopResumeButton.Sensitive = true;

                }

            });

        }

        protected void OnNewRecipe(object sender, NewRecipeEventArgs args)

        {

            Gtk.Application.Invoke(delegate

            {

                progressBar.Pulse();

                // TODO: Add item to recipe list only if not already listed

                bool exists = false;

                Gtk.TreeIter iter;

                if (colorStore.GetIterFirst(out iter))

                {

                    do

                    {

                        string color = (string)colorStore.GetValue(iter, 0);

                        if (color.Equals(args.Color))

                        {

                            exists = true;

                            break;

                        }

                    } while (colorStore.IterNext(ref iter));

                }

                if (!exists)

                {

                    Console.WriteLine("Add new recipe for {0}", args.Color);

                    //    bool isMissingReactions = args.Recipe.CheckMissingReactions(ref missingReactions);

                    //    string missingReactionLabel = isMissingReactions ? "X" : "";

                    colorStore.AppendValues(args.Color); // , missingReactionLabel);

                    countLabel.Text = String.Format("{0} / {1}", generator.Recipes.Count, Palette.Count);

                }

            });

        }

        protected void OnProgress(object sender, EventArgs args)

        {

            Gtk.Application.Invoke(delegate

            {

                // TODO: based on time rather than count

                long progressTime = DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond;

                long delta = progressTime - lastProgressUpdate;

                if (delta > 30)

                {

                    progressBar.Pulse();

                    lastProgressUpdate = progressTime;

                }

                delta = progressTime - lastStatusUpdate;

                if (delta > 500)

                {

                    // Update recipe count label as well

                    statusLabel.Text = String.Format("Recipes searched: {0:N00}", generator.RecipeCount);

                    lastStatusUpdate = progressTime;

                }

                //progressBar.Fraction = (double)((generator.RecipeCount / 10000) % 100) / 100.0;

            });

        }

        protected void OnColorSelected(object o, EventArgs args)

        {

            Gtk.TreeModel model;

            Gtk.TreeIter iter;

            Gtk.TreeSelection selection = recipeList.Selection;

            if ((selection != null) && selection.GetSelected(out model, out iter))

            {

                string colorName = (string)colorStore.GetValue(iter, 0);

                PaintRecipe recipe;

                if (profile.Recipes.TryGetValue(colorName, out recipe))

                {

                    foreach (Gtk.Widget child in recipeListBox.AllChildren)

                    {

                        recipeListBox.Remove(child);

                    }

                    if (recipe.CheckMissingReactions(ref missingReactions))

                    {

                        statusLabel.Text = "WARNING: This recipe includes reactions that have not yet been recorded.";

                    }

                    foreach (PaintRecipe.RecipeIngredient ingredient in recipe.Ingredients)

                    {

                        Gtk.Label label = new Gtk.Label(ingredient.quantity.ToString() + " " + ingredient.name);

                        recipeListBox.PackStart(label);

                        label.Show();

                    }

                }

                paintSwatch.Color = recipe.ReactedColor;

            }

        }

        protected void OnExportToWiki(object sender, EventArgs e)

        {

            Gtk.FileChooserDialog fileDialog =

                new Gtk.FileChooserDialog("Select destination file.",

                        this, Gtk.FileChooserAction.Save,

                        Gtk.Stock.Cancel, Gtk.ResponseType.Cancel,

                        Gtk.Stock.Save, Gtk.ResponseType.Accept);

            Gtk.ResponseType resp = (Gtk.ResponseType)fileDialog.Run();

            if (resp == Gtk.ResponseType.Accept)

            {

                string fileName = fileDialog.Filename;

                string directory = fileDialog.CurrentFolder;

                profile.ExportWikiRecipes(System.IO.Path.Combine(directory, fileName));

            }

            fileDialog.Destroy();

        }

        protected void OnShowIngredients(object sender, EventArgs e)

        {

            ReagentWindow win = new ReagentWindow(profile);

            win.Show();

        }

    }

}