Changeset - 3463e3d12e78
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Jason Maltzen (jmaltzen) - 7 years ago 2018-05-18 18:07:15
jason.maltzen@unsanctioned.net
Fix a bug where recipe generation could use up to 1 more than MaxConcentration
1 file changed with 17 insertions and 8 deletions:
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RecipeGenerator.cs
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/*
 
 * 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;
 
using System.Collections.Generic;
 
using System.Collections.Concurrent;
 
using System.Text.RegularExpressions;
 
using System.Threading;
 

	
 
namespace DesertPaintLab
 
{
 
    public class NewRecipeEventArgs : EventArgs
 
    {
 
        string color;
 
        PaintRecipe recipe;
 

	
 
        public NewRecipeEventArgs(string color, PaintRecipe recipe)
 
        {
 
            this.color = color;
 
            this.recipe = recipe;
 
        }
 

	
 
        public string Color
 
        {
 
            get {
 
                return color;
 
            }
 
        }
 

	
 
        public PaintRecipe Recipe
 
        {
 
            get {
 
                return recipe;
 
            }
 
        }
 
    }
 

	
 
    public class RecipeGenerator
 
    {
 
        public enum SearchType {
 
            DEPTH_FIRST,
 
            BREADTH_FIRST
 
        };
 

	
 
        public SearchType Mode { get; set; }
 

	
 
        public uint MinConcentration { get; private set; } // minimum paint concentration
 
        public uint MaxConcentration { get; private set; } // maximum paint concentration
 
        public uint MaxReagents { get; private set; } // maximum number of reagents to use in the recipe
 
        public uint MinReagents { get; private set; } // minimum number of reagents to use in the recipe
 
        public uint FullQuantityDepth { get; private set; } // at or equal this number of reagents, ignore ingredient settings for max quantity
 
        public uint FullQuantity { get; private set; }  // The max number of a reagent to use at full quantity
 

	
 
        public uint MaxThreads { get; set; }
 

	
 
        ReactionSet reactions;
 
        bool running = false;
 

	
 
        int runningThreads = 0;
 
        
 
        SortedDictionary<string, uint> recipeCosts = new SortedDictionary<string, uint>();
 
        SortedDictionary<string, PaintRecipe> recipes = new SortedDictionary<string, PaintRecipe>();
 

	
 
        uint totalReagents;
 

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

	
 
        ConcurrentQueue<RecipeSearchNode> searchQueue = new ConcurrentQueue<RecipeSearchNode>();
 

	
 
        ulong recipeCount = 0;
 

	
 
        List<Thread> generatorThreads = new List<Thread>();
 
        Object workerLock = new Object();
 

	
 
        bool requestCancel = false;
 

	
 
        StreamWriter log;
 

	
 
        // events
 
        public event EventHandler Finished;
 
        public event EventHandler Progress;
 
        public event EventHandler<NewRecipeEventArgs> NewRecipe;
 

	
 
        public RecipeGenerator(ReactionSet reactions)
 
        {
 
            Mode = SearchType.BREADTH_FIRST;
 
            this.reactions = reactions;
 
            foreach (PaintColor color in Palette.Colors)
 
            {
 
                recipes.Add(color.Name, new PaintRecipe());
 
                recipeCosts.Add(color.Name, uint.MaxValue);
 
            }
 
            MinReagents = 1;
 
            MaxReagents = 5;
 
            MinConcentration = 10;
 
            MaxConcentration = 20;
 
        }
 

	
 
        public SortedDictionary<string, PaintRecipe> Recipes
 
        {
 
            get
 
            {
 
                return recipes;
 
            }
 
        }
 

	
 
        public ulong RecipeCount
 
        {
 
            get
 
            {
 
                return recipeCount;
 
            }
 
        }
 

	
 
        public bool CanResume
 
        {
 
            get
 
            {
 
                return (!running && (searchQueue.Count > 0));
 
            }
 
        }
 

	
 
        public string Log
 
        {
 
            set
 
            {
 
                if (value != null)
 
                {
 
                    log = new StreamWriter(value);
 
                }
 
                else
 
                {
 
                    log = null;
 
                }
 
            }
 
        }
 

	
 
        private class ReagentCostSort : IComparer<Reagent>
 
        {
 
            public int Compare(Reagent reagent1, Reagent reagent2)
 
            {
 
                return (int)reagent1.Cost - (int)reagent2.Cost;
 
            }
 
        }
 

	
 
        public void InitRecipes(SortedDictionary<string, PaintRecipe> initialRecipes)
 
        {
 
            if (running)
 
            {
 
                return;
 
            }
 
            recipeCosts.Clear();
 
            recipes.Clear();
 
            foreach (PaintRecipe recipe in initialRecipes.Values)
 
            {
 
                //PaintRecipe recipeCopy = new PaintRecipe(recipe);
 
                AddCheapestRecipe(recipe);
 
            }
 
        }
 

	
 
        private void InitSortedReagents()
 
        {
 
            costSortedReagents.Clear();
 
            foreach (string name in ReagentManager.Names)
 
            {
 
                Reagent reagent = ReagentManager.GetReagent(name);
 
                costSortedReagents.Add(reagent);
 
            }
 
            costSortedReagents.Sort(new ReagentCostSort());
 
        }
 

	
 
        // Generate paint recipes.
 
        // minConcentration - the minimum permitted concentration in a recipe (10 for paint, 50 for ribbons)
 
        // maxConcentration - the maximum concentrataion for a recipe
 
        // minReagents - the minimum number of ingredients in a recipe
 
        // maxReagents - the maximum number of ingredients allowed in a recipe
 
        // fullQuantityDepth - at this depth of ingredient or below, allow up to fullQuantity of any reagent
 
        // fullQuantity - the maximum amount of any reagent to permit up to the full quantity depth. After that, reagents are limited by the
 
        //                per-reagent value
 
        public void BeginRecipeGeneration(uint minConcentration, uint maxConcentration, uint minReagents, uint maxReagents, uint fullQuantityDepth, uint fullQuantity)
 
        {
 
            if (running)
 
            {
 
                // Already running - don't start again
 
                return;
 
            }
 

	
 
            this.MinConcentration = minConcentration;
 
            this.MaxConcentration = maxConcentration;
 
            this.MinReagents = minReagents;
 
            this.MaxReagents = maxReagents;
 
            this.FullQuantity = fullQuantity;
 
            this.FullQuantityDepth = fullQuantityDepth;
 

	
 
            // first, sort reagents by cost.
 
            InitSortedReagents();
 

	
 
            totalReagents = (uint)costSortedReagents.Count;
 

	
 
            // Pre-populate recipes list with:
 
            // 1) 1-ingredient recipes @ min concentration for all enabled ingredients with a count >= min concentration
 
            // 2) any previously-generated recipes
 
            int enabledReagentCount = 0;
 
            PaintRecipe recipe = new PaintRecipe();
 
            recipe.Reactions = reactions;
 
            foreach (Reagent reagent in costSortedReagents)
 
            {
 
                if (reagent.Enabled)
 
                {
 
                    if (!reagent.IsCatalyst && ((reagent.RecipeMax >= minConcentration) || ((FullQuantityDepth > 0) && (FullQuantity >= minConcentration))))
 
                    {
 
                        recipe.Clear();
 
                        recipe.AddReagent(reagent.Name, minConcentration);
 
                        AddCheapestRecipe(recipe);
 
                    }
 
                    ++enabledReagentCount;
 
                }
 
            }
 
            this.MaxReagents = (uint)Math.Min(enabledReagentCount, this.MaxReagents);
 
            this.MinReagents = (uint)Math.Min(this.MinReagents, this.MaxReagents);
 

	
 
            while (!searchQueue.IsEmpty)
 
            {
 
                RecipeSearchNode node;
 
                searchQueue.TryDequeue(out node);
 
            }
 
            for (uint reagentIdx = 0; reagentIdx < costSortedReagents.Count; ++reagentIdx)
 
            {
 
                if (costSortedReagents[(int)reagentIdx].Enabled)
 
                {
 
                    // queue up all combinations of MinReagents
 
                    RecipeSearchNode initialNode = new RecipeSearchNode(costSortedReagents, reagentIdx);
 
                    initialNode.FullQuantity = FullQuantity;
 
                    initialNode.FullQuantityDepth = FullQuantityDepth;
 
                    initialNode.MinConcentration = minConcentration;
 
                    initialNode.MaxConcentration = maxConcentration;
 
                    initialNode.MinReagents = minReagents;
 
                    initialNode.MaxReagents = maxReagents;
 

	
 
                    if (MinReagents > 1)
 
                    {
 
                        while (NextReagentSetBreadthFirst(initialNode, 1, minReagents) == true)
 
                        {
 
                            if (initialNode.ReagentCount == minReagents)
 
                            {
 
                                //Console.WriteLine("Initial node at size {0}/{1} with recipe: {2}", initialNode.ReagentCount, minReagents, initialNode.TestRecipe.ToString());
 
                                RecipeSearchNode searchNode = new RecipeSearchNode(initialNode);
 
                                searchQueue.Enqueue(searchNode);
 
                            }
 
                        }
 
                    }
 
                    else
 
                    {
 
                        searchQueue.Enqueue(initialNode);
 
                    }
 
                }
 
            }
 

	
 
            recipeCount = 0;
 

	
 
            if (log != null)
 
            {
 
                log.WriteLine("Begin recipe generation: MaxConcentration={0} MinReagents={1} MaxReagents={2} FullQuantity={3} FullQuantityDepth={4}", MaxConcentration, MinReagents, MaxReagents, FullQuantity, FullQuantityDepth);
 
            }
 
            
 
            // start worker threads to do the actual work
 
            ResumeRecipeGeneration();
 
        }
 

	
 
        public void ResumeRecipeGeneration()
 
        {
 
            if (running)
 
            {
 
                // Already running - don't start again
 
                return;
 
            }
 
            running = true;
 
            requestCancel = false;
 

	
 
            if (log != null)
 
            {
 
                log.WriteLine("Resuming recipe generation: pre-threads={0} reagent count={1} search queue={2}", runningThreads, costSortedReagents.Count, searchQueue.Count);
 
            }
 
            runningThreads = 0; // presumably!
 

	
 
            int threadCount = Math.Min(Math.Min(costSortedReagents.Count, searchQueue.Count), (int)MaxThreads);
 
            if (threadCount == 0)
 
            {
 
                if (Finished != null)
 
                {
 
                    Finished(this, null);
 
                }
 
            }
 
            generatorThreads.Clear();
 
            System.Console.WriteLine("Starting {0} generator threads.", threadCount);
 
            for (int i = 0; i < threadCount; ++i)
 
            {
 
                Thread thr = new Thread(new ThreadStart(this.Generate));
 
                thr.Priority = ThreadPriority.BelowNormal;
 
                generatorThreads.Add(thr);
 
            }
 
            foreach (Thread thr in generatorThreads)
 
            {
 
                thr.Start();
 
            }
 
        }
 

	
 
        public bool SaveState(string file)
 
        {
 
            if (running)
 
            {
 
                // can't save state while running
 
                return false;
 
            }
 

	
 
            lock(workerLock)
 
            {
 
                using (StreamWriter writer = new StreamWriter(file, false))
 
                {
 
                    writer.WriteLine("MinReagents: {0}", MinReagents);
 
                    writer.WriteLine("MaxReagents: {0}", MaxReagents);
 
                    writer.WriteLine("FullQuantityDepth: {0}", FullQuantityDepth);
 
                    writer.WriteLine("FullQuantity: {0}", FullQuantity);
 
                    writer.WriteLine("TotalReagents: {0}", totalReagents);
 
                    writer.WriteLine("RecipeCount: {0}", recipeCount);
 
                    writer.WriteLine("SearchType: {0}", Mode.ToString());
 
                    foreach (KeyValuePair<string, PaintRecipe> pair in recipes)
 
                    {
 
                        PaintRecipe recipe = pair.Value;
 
                        string colorName = Palette.FindNearest(recipe.ReactedColor);
 
                        writer.WriteLine("BeginRecipe: {0}", colorName);
 
                        foreach (PaintRecipe.RecipeIngredient ingredient in recipe.Ingredients)
 
                        {
 
                            writer.WriteLine("Ingredient: {0}={1}", ingredient.name, ingredient.quantity);
 
                        }
 
                        writer.WriteLine("EndRecipe: {0}", colorName);
 
                    }
 
                    writer.WriteLine("SearchNodes: {0}", searchQueue.Count);
 
                    foreach (RecipeSearchNode node in searchQueue)
 
                    {
 
                        node.SaveState(writer);
 
                   }
 
                }
 
            }
 
            return true;
 
        }
 

	
 
        static Regex keyValueRegex = new Regex(@"(?<key>\w+)\:\s*(?<value>.+)\s*");
 
        static Regex ingredientRegex = new Regex(@"(?<ingredient>(\w+\s)*\w+)\s*=\s*(?<quantity>\d)\s*");
 
        public bool LoadState(string file)
 
        {
 
            // cannot be running, and reactions must be set
 
            if (running)
 
            {
 
                return false;
 
            }
 

	
 
            InitSortedReagents();
 
            bool success = true;
 

	
 
            PaintRecipe currentRecipe = null;
 
            Match match;
 
            string line;
 
            using (StreamReader reader = new StreamReader(file, false))
 
            {
 
                while (success && ((line = reader.ReadLine()) != null))
 
                {
 
                    match = keyValueRegex.Match(line);
 
                    if (match.Success)
 
                    {
 
                        string value = match.Groups["value"].Value;
 
                        switch(match.Groups["key"].Value)
 
                        {
 
                            case "MinReagents":
 
                                MinReagents = uint.Parse(value);
 
                                MaxReagents = (uint)Math.Max(this.MinReagents, this.MaxReagents);
 
                                break;
 
                            case "MaxReagents":
 
                                MaxReagents = uint.Parse(value);
 
                                MinReagents = (uint)Math.Min(this.MinReagents, this.MaxReagents);
 
                                break;
 
                            case "FullQuantityDepth":
 
                                FullQuantityDepth = uint.Parse(value);
 
                                break;
 
                            case "FullQuantity":
 
                                FullQuantity = uint.Parse(value);
 
                                break;
 
                            case "TotalReagents":
 
                                totalReagents = uint.Parse(value);
 
                                break;
 
                            case "RecipeCount":
 
                                if (!ulong.TryParse(value, out recipeCount))
 
                                {
 
                                    // must have rolled to negative - try as an int and convert
 
                                    int recipeCountInt = int.Parse(value);
 
                                    recipeCount = (ulong)((long)recipeCountInt & 0x00000000ffffffffL);
 
                                }
 
                                break;
 
                            case "BeginRecipe":
 
                                currentRecipe = new PaintRecipe();
 
                                currentRecipe.Reactions = reactions;
 
                                break;
 
                            case "EndRecipe":
 
                                if (currentRecipe != null)
 
                                {
 
                                    PaintColor color = currentRecipe.ReactedColor;
 
                                    uint cost = currentRecipe.Cost;
 
                                    recipes[color.Name] = currentRecipe; // replace
 
                                    recipeCosts[color.Name] = cost;
 
                                    currentRecipe = null;
 
                                }
 
                                break;
 
                            case "Ingredient":
 
                                if (currentRecipe != null)
 
                                {
 
                                    Match ingredientMatch = ingredientRegex.Match(match.Groups["value"].Value);
 
                                    if (ingredientMatch.Success)
 
                                    {
 
                                        uint quantity = uint.Parse(ingredientMatch.Groups["quantity"].Value);
 
                                        currentRecipe.AddReagent(ingredientMatch.Groups["ingredient"].Value, quantity);
 
                                    }
 
                                    else
 
                                    {
 
                                        success = false;
 
                                    }
 
                                }
 
                                break;
 
                            case "SearchNodes":
 
                                int nodeCount = int.Parse(match.Groups["value"].Value);
 
                                for (int i = 0; i < nodeCount; ++i)
 
                                {
 
                                    RecipeSearchNode node = new RecipeSearchNode(costSortedReagents);
 
                                    node.FullQuantity = FullQuantity;
 
                                    node.FullQuantityDepth = FullQuantityDepth;
 
                                    node.MinReagents = MinReagents;
 
                                    node.MaxReagents = MaxReagents;
 
                                    node.MaxConcentration = MaxConcentration;
 
                                    success = success && node.LoadState(reader);
 
                                    if (success)
 
                                    {
 
                                        searchQueue.Enqueue(node);
 
                                    }
 
                                }
 
                                break;
 
                            case "SearchType":
 
                                Mode = (SearchType)Enum.Parse(typeof(SearchType), match.Groups["value"].Value);
 
                                break;
 
                            default:
 
                                success = false;
 
                                break;
 
                        }
 
                    }
 
                    else
 
                    {
 
                        success = false;
 
                        break;
 
                    }
 
                }
 
                return success;
 
            }
 
        }
 

	
 
        private void Generate()
 
        {
 
            RecipeSearchNode node;
 

	
 
            lock(workerLock)
 
            {
 
                ++runningThreads;
 
            }
 

	
 
            bool ok = true;
 
            do
 
            {
 
                lock (workerLock)
 
                {
 
                    ok = searchQueue.TryDequeue(out node);
 
                }
 
                if (ok)
 
                {
 
                    if (Mode == SearchType.DEPTH_FIRST)
 
                    {
 
                        uint targetQuantity = (node.ReagentCount <= FullQuantityDepth) ? ((uint)node.ReagentCount * FullQuantity) : node.MaxConcentration + 1;
 
                        uint targetQuantity = (node.ReagentCount <= FullQuantityDepth)
 
                            ? ((uint)node.ReagentCount * FullQuantity) 
 
                            : node.MaxConcentration + 1;
 
                        do {
 
                            --targetQuantity;
 
                            node.InitForQuantity(targetQuantity);
 
                        } while (targetQuantity > MinConcentration && (node.CurrentTargetQuantity != node.UsedQuantity));
 
    
 
                        while ((ok = IterateDepthFirst(node)) && !requestCancel)
 
                        {
 
                            if (Progress != null)
 
                            {
 
                                Progress(this, null);
 
                            }
 
                        }
 
                    }
 
                    else
 
                    {
 
                        // breadth-first search
 
                        uint targetQuantity = MinConcentration-1;
 
                        uint quantityLimit = (node.ReagentCount <= FullQuantityDepth) ? (FullQuantity * (uint)node.ReagentCount) : node.MaxConcentration;
 
                        uint targetQuantity = MinConcentration - 1;
 
                        uint quantityLimit = (node.ReagentCount <= FullQuantityDepth) 
 
                            ? (FullQuantity * (uint)node.ReagentCount) 
 
                            : node.MaxConcentration;
 
                        do {
 
                            ++targetQuantity;
 
                            node.InitForQuantity(targetQuantity);
 
                        } while ((targetQuantity <= quantityLimit) && (node.CurrentTargetQuantity != node.UsedQuantity));
 
                        } while ((targetQuantity < quantityLimit) && (node.CurrentTargetQuantity != node.UsedQuantity));
 
    
 
                        while ((ok = IterateBreadthFirst(node)) && !requestCancel)
 
                        {
 
                            if (Progress != null)
 
                            {
 
                                Progress(this, null);
 
                            }
 
                            Progress?.Invoke(this, null);
 
                        }
 
                    }
 
                    if (ok)
 
                    {
 
                        // stopped because cancel was requested - requeue the node in its current state for resume
 
                        searchQueue.Enqueue(node);
 
                    }
 
                }
 
            } while (!requestCancel && ok);
 

	
 
            bool done = false;
 
            lock(workerLock)
 
            {
 
                --runningThreads;
 
                //generatorThreads.Remove(Thread.CurrentThread);
 

	
 
                done = (runningThreads == 0);
 
            }
 
            if (done)
 
            {
 
                running = false;
 
                requestCancel = false;
 
                if (Finished != null)
 
                {
 
                    Finished(this, null);
 
                }
 
            }
 
        }
 

	
 
        // Add the cheapest recipe to the recipe list
 
        // returns the discarded recipe from the pair (or null if no original recipe to replace)
 
        private void AddCheapestRecipe(PaintRecipe recipe)
 
        {
 
            if (recipe.IsValidForConcentration(MinConcentration))
 
            {
 
                recipe.Reactions = reactions;
 

	
 
                string colorName = Palette.FindNearest(recipe.ReactedColor);
 
                //System.Console.WriteLine("Recipe: {0} {1}:", colorName, recipe.Cost);
 
                //foreach (PaintRecipe.RecipeIngredient ingr in recipe.Ingredients)
 
                //{
 
                //    System.Console.WriteLine("    -> {0} {1}", ingr.quantity, ingr.name);
 
                //}
 
                uint cost;
 
                lock (workerLock)
 
                {
 
                    if (recipeCosts.TryGetValue(colorName, out cost))
 
                    {
 
                        if (cost > recipe.Cost)
 
                        {
 
                            recipes[colorName].CopyFrom(recipe);
 
                            recipeCosts[colorName] = recipe.Cost;
 
                            if (NewRecipe != null)
 
                            {
 
                                NewRecipeEventArgs args = new NewRecipeEventArgs(colorName, recipe);
 
                                NewRecipe(this, args);
 
                            }
 
                        }
 
                        else
 
                        {
 
                            Console.WriteLine("Ignoring recipe - existing cost is cheaper.");
 
                        }
 
                    }
 
                    else
 
                    {
 
                        // This would be an error!
 
                        recipeCosts.Add(colorName, recipe.Cost);
 
                        recipes.Add(colorName, new PaintRecipe(recipe));
 
                        if (NewRecipe != null)
 
                        {
 
                            NewRecipeEventArgs args = new NewRecipeEventArgs(colorName, recipe);
 
                            NewRecipe(this, args);
 
                        }
 
                    }
 
                }
 
            }
 
            else
 
            {
 
                string msg = String.Format("Recipe is invalid ({0} ingredients)\n", recipe.Ingredients.Count);
 
                foreach (PaintRecipe.RecipeIngredient ingr in recipe.Ingredients)
 
                {
 
                    msg += String.Format("    -> {0} {1}", ingr.quantity, ingr.name);
 
                }
 
                lock (workerLock) {
 
                    Console.WriteLine(msg);
 
                }
 
            }
 
        }
 

	
 
        private bool IterateDepthFirst(RecipeSearchNode node)
 
        {
 
            TestCurrentRecipe(node);
 

	
 
            // pick recipe quantities at current recipe ingredients/size
 
            if (NextRecipe(node))
 
            {
 
                lock(workerLock)
 
                {
 
                    ++recipeCount;
 
                }
 
                //System.Console.WriteLine("Found next recipe at size {0} qty {1}", node.Reagents.Count, node.CurrentTargetQuantity);
 
                return true;
 
            }
 

	
 
            if (NextRecipeSize(node))
 
            {
 
                //System.Console.WriteLine("Found next recipe size {0}", node.CurrentTargetQuantity);
 
                return true;
 
            }
 

	
 
            // Search for next ingredient combo - all quantity combos for previous were searched
 
            //System.Console.WriteLine("Finding next ingredient combo");
 
            do
 
            {
 
                if (!node.AddNextReagent())
 
                {
 
                    while ((node.ReagentCount > node.MinReagents) && (node.LastReagent == (totalReagents-1)))
 
                    {
 
                        node.RemoveLastReagent();
 
                    }
 
                    if (node.ReagentCount == node.MinReagents)
 
                    {
 
                        // done
 
                        return false;
 
                    }
 
                    uint nextReagent = node.NextFreeReagent(node.LastReagent);
 
                    while ((node.ReagentCount > node.MinReagents) && (nextReagent >= totalReagents))
 
                    {
 
                        // No more reagents to try at this level
 
                        node.RemoveLastReagent();
 
                        if (node.ReagentCount > node.MinReagents)
 
                        {
 
                            nextReagent = node.NextFreeReagent(node.LastReagent);
 
                        }
 
                    }
 
                    if (node.ReagentCount == node.MinReagents)
 
                    {
 
                        // done
 
                        return false;
 
                    }
 
                    node.ReplaceLastReagent(nextReagent);
 
                }
 
            } while (node.MaxConcentration < (node.MinConcentration + node.CatalystCount));
 
            node.InitForQuantity(node.MaxConcentration);
 

	
 
            //string outStr = "{0} : {1} : ";
 
            //for (int i = 0; i < currentReagents.Count; ++i)
 
            //{
 
            //    Reagent reagent = costSortedReagents[(int)currentReagents[i]];
 
            //    if (i > 0)
 
            //    {
 
            //        outStr += ", ";
 
            //    }
 
            //    outStr += reagent.Name + " (" + reagent.Cost + ")";
 
            //}
 
            //Console.WriteLine(outStr, currentReagents.Count, recipeCount);
 
            return true;
 
        }
 

	
 
        private bool IterateBreadthFirst(RecipeSearchNode node)
 
        {
 
            // pick recipe quantities at current recipe ingredients/size
 
            TestCurrentRecipe(node);
 
            lock(workerLock)
 
            {
 
                ++recipeCount;
 
            }
 

	
 
            // search all quantities of current recipe
 
            if (NextRecipe(node))
 
            {
 
                //System.Console.WriteLine("Found next recipe at size {0} qty {1}", node.ReagentCount, node.CurrentTargetQuantity);
 
                return true;
 
            }
 

	
 
            // Try next quantity
 
            uint newQuantity;
 
            uint quantityLimit = ((uint)node.ReagentCount <= FullQuantityDepth) ? ((uint)node.ReagentCount * FullQuantity) : node.MaxConcentration;
 
            do {
 
                newQuantity = node.CurrentTargetQuantity + 1;
 
                //Console.WriteLine("Try quantity {0}", newQuantity);
 
                if (newQuantity <= quantityLimit)
 
                {
 
                    node.InitForQuantity(newQuantity);
 
                    if (node.CurrentTargetQuantity <= node.UsedQuantity)
 
                    {
 
                        if (log != null) { lock(log) { log.WriteLine("Update quantity to {0}", node.CurrentTargetQuantity); } }
 
                        return true;
 
                    }
 
                }
 
            } while (newQuantity < quantityLimit);
 

	
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