initialNode.MaxReagents = maxReagents;

                    searchQueue.Enqueue(initialNode);

                }

            }

            recipeCount = 0;

            if (log != null)

            {

                log.WriteLine("Begin recipe generation: MaxQuantity={0} MaxReagents={1} FullQuantity={2} FullQuantityDepth={3}", MaxQuantity, 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!

            if (threadCount == 0)

            {

                if (Finished != null)

                {

                    Finished(this, null);

                }

            }

            generatorThreads.Clear();

            for (int i = 0; i < threadCount; ++i)

            {

                Thread thr = new Thread(new ThreadStart(this.Generate));

                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;

            }

            using (StreamWriter writer = new StreamWriter(file, false))

            {

                writer.WriteLine("MaxReagents: {0}", MaxReagents);

                writer.WriteLine("FullQuantityDepth: {0}", FullQuantityDepth);

                writer.WriteLine("FullQuantity: {0}", FullQuantity);