public void Test_Solution_Trees_Consolidate()
        {
            SudokuOptions.Current.ShowAllSolutions = false;

            ProgressIndicator pi = new ProgressIndicator(System.Reflection.MethodBase.GetCurrentMethod().Name);

            FileInfo[] files = new DirectoryInfo(Directories.SolutionTrees).GetFiles(FileExtensions.XmlZipMask);

            string dir = Directories.SolutionTrees + Path.DirectorySeparatorChar + "Consolidate";

            new DirectoryInfo(dir).CreateOrEmpty();

            int index = 0;
            ConcurrentCounter counter = new ConcurrentCounter();

            Parallel.ForEach(files, (file) =>
            {
                counter.Increment();
                pi.AddLine((counter.Value * 100 / files.Length).ToString());

                SudokuSolutionNode root = SudokuSolutionNode.LoadFromFile(file.FullName);

                foreach (SudokuSolutionNode node in root.GetAllNodesEnumerator())
                {
                    if (node.State != SudokuSolutionNodeState.State)
                    {
                        continue;
                    }

                    var filtered_sols = SudokuSolutionNode.FilterByOptions(node.Nodes.Select(n => n.Solution).ToList());

                    var filtered_nodes = (from n in node.Nodes
                                          where filtered_sols.Contains(n.Solution)
                                          select n).ToList();

                    var new_includes = (from n1 in filtered_nodes
                                        from n2 in filtered_nodes
                                        where SudokuSolutionNode.IsInclude(n1.Solution, n2.Solution, false)
                                        select new { n1, n2 }).ToList();

                    var ignore_pairs = new[]
                    {
                        new [] { SudokuSolutionType.NakedPair, SudokuSolutionType.BoxLineReduction },
                        new [] { SudokuSolutionType.NakedPair, SudokuSolutionType.PointingPair },
                        new [] { SudokuSolutionType.NakedPair, SudokuSolutionType.NakedTriple },
                        new [] { SudokuSolutionType.NakedPair, SudokuSolutionType.NakedQuad },
                        new [] { SudokuSolutionType.NakedTriple, SudokuSolutionType.BoxLineReduction },
                        new [] { SudokuSolutionType.NakedTriple, SudokuSolutionType.NakedQuad },
                        new [] { SudokuSolutionType.NakedTriple, SudokuSolutionType.PointingPair },
                        new [] { SudokuSolutionType.NakedTriple, SudokuSolutionType.PointingTriple },
                        new [] { SudokuSolutionType.NakedQuad, SudokuSolutionType.PointingPair },
                        new [] { SudokuSolutionType.HiddenPair, SudokuSolutionType.HiddenTriple },
                        new [] { SudokuSolutionType.HiddenPair, SudokuSolutionType.HiddenQuad },
                        new [] { SudokuSolutionType.HiddenTriple, SudokuSolutionType.HiddenQuad },
                    };

                    var ignore = from pair in new_includes
                                 from ignore_pair in ignore_pairs
                                 where (((pair.n1.Solution.Type == ignore_pair.First()) &&
                                         (pair.n2.Solution.Type == ignore_pair.Last())) ||
                                        ((pair.n1.Solution.Type == ignore_pair.Last()) &&
                                         (pair.n2.Solution.Type == ignore_pair.First())))
                                 select pair;

                    new_includes = new_includes.Except(ignore).ToList();

                    var doubles = from p1 in new_includes
                                  from p2 in new_includes
                                  where (p1.n1 == p2.n2) &&
                                  (p1.n2 == p2.n1)
                                  select p1;

                    new_includes = new_includes.Except(doubles).ToList();

                    foreach (var pair in new_includes)
                    {
                        SudokuIntermediateSolution intermediate_solution_1 =
                            new SudokuIntermediateSolution(pair.n1.Board, pair.n1.NextBoard, pair.n1.Solution);

                        intermediate_solution_1.SaveToFile(dir + Path.DirectorySeparatorChar + index + "_" +
                                                           Path.GetFileNameWithoutExtension(Path.GetFileNameWithoutExtension(file.FullName)) + "_" +
                                                           pair.n1.Solution.Type + FileExtensions.XmlZipExt);

                        SudokuIntermediateSolution intermediate_solution_2 =
                            new SudokuIntermediateSolution(pair.n2.Board, pair.n2.NextBoard, pair.n2.Solution);

                        intermediate_solution_2.SaveToFile(dir + Path.DirectorySeparatorChar + index + "_" +
                                                           Path.GetFileNameWithoutExtension(Path.GetFileNameWithoutExtension(file.FullName)) + "_" +
                                                           pair.n2.Solution.Type + FileExtensions.XmlZipExt);

                        index++;
                    }
                }
            });

            Assert.IsTrue(index == 0);
        }
        private static void GenerateAllSolutions(GenerationMethod a_method)
        {
            System.Console.WriteLine();
            System.Console.WriteLine("Generating solutions...");
            System.Console.WriteLine();

            string dir = Directories.SolutionTrees + Path.DirectorySeparatorChar + "All";

            new DirectoryInfo(dir).CreateOrEmpty();

            FileInfo[] files1 = new DirectoryInfo(Directories.Examples).GetFiles(FileExtensions.XmlZipMask);
            FileInfo[] files2 = new DirectoryInfo(Directories.SolutionTrees).GetFiles(FileExtensions.XmlZipMask);

            var not_all = (from file1 in files1
                           where files2.Count(fi => Directories.ConvertName(fi.FullName) == file1.Name) < 4
                           select file1).ToArray();

            var too_much = (from file2 in files2
                            where files1.All(fi => fi.Name != Directories.ConvertName(file2.Name))
                            select file2).ToArray();


            if (not_all.Count() > 0)
            {
                System.Console.WriteLine("Is in 'Examples', but not in 'SolutionTrees' (run project 'SudokuGenerator'): " + not_all.First().FullName);
                System.Console.ReadKey(true);
                return;
            }

            if (too_much.Count() > 0)
            {
                System.Console.WriteLine("Is in 'SolutionTrees', but not in 'Examples': " + too_much.First().FullName);
                System.Console.ReadKey(true);
                return;
            }

            FileInfo[] files = (from file in new DirectoryInfo(Directories.SolutionTrees).GetFiles(FileExtensions.XmlZipMask)
                                group file by Directories.ConvertName(file.Name) into gr
                                select gr.First()).ToArray();

            ShowProgress(0, 70);

            ConcurrentCounter counter = new ConcurrentCounter();

            Parallel.ForEach(files, (file) =>
            {
                SudokuSolutionNode root = SudokuSolutionNode.LoadFromFile(file.FullName);

                string file_name = Path.GetFileNameWithoutExtension(Directories.ConvertName(file.Name));

                Dictionary <SudokuSolutionType, int> counters = new Dictionary <SudokuSolutionType, int>();
                Dictionary <SudokuSolutionType, List <SudokuSolutionNode> > lists = new Dictionary <SudokuSolutionType, List <SudokuSolutionNode> >();

                foreach (var type in Enum.GetValues(typeof(SudokuSolutionType)).Cast <SudokuSolutionType>())
                {
                    if (type == SudokuSolutionType.MarkImpossibles)
                    {
                        continue;
                    }
                    if (type == SudokuSolutionType.MarkSolved)
                    {
                        continue;
                    }
                    if (type == SudokuSolutionType.SinglesInUnit)
                    {
                        continue;
                    }

                    new DirectoryInfo(dir + Path.DirectorySeparatorChar + type).CreateOrEmpty();
                    lists[type]    = new List <SudokuSolutionNode>();
                    counters[type] = 1;
                }

                foreach (var list in lists.Values)
                {
                    list.Clear();
                }

                foreach (SudokuSolutionNode node in root.GetAllNodesEnumerator())
                {
                    if (node.State != SudokuSolutionNodeState.State)
                    {
                        continue;
                    }

                    var nodes = (from n in node.Nodes
                                 where (n.Solution.Type != SudokuSolutionType.MarkImpossibles) &&
                                 (n.Solution.Type != SudokuSolutionType.MarkSolved) &&
                                 (n.Solution.Type != SudokuSolutionType.SinglesInUnit)
                                 select n).ToList();

                    var sols = SudokuSolutionNode.FilterByOptions(nodes.Select(n => n.Solution).ToList());

                    var nodes_gr = (from n in nodes
                                    where sols.Contains(n.Solution)
                                    group n by n.Solution.Type into gr
                                    select gr.ToList()).ToList();


                    if ((a_method == GenerationMethod.OneType) || (a_method == GenerationMethod.OneSolution))
                    {
                        bool one_type = nodes_gr.Count(gr => gr.Any()) == 1;

                        if (!one_type)
                        {
                            continue;
                        }
                    }

                    if (a_method == GenerationMethod.OneSolution)
                    {
                        bool one_solution = nodes_gr.Count(gr => gr.Count == 1) == 1;

                        if (!one_solution)
                        {
                            continue;
                        }
                    }

                    foreach (var n in nodes)
                    {
                        lists[n.Solution.Type].Add(n);
                    }
                }

                foreach (var list in lists.Values)
                {
                    var uniques = from n in list
                                  group n by n.Solution into gr
                                  select gr.First();

                    var exclude = from n1 in uniques
                                  from n2 in uniques
                                  where !Object.ReferenceEquals(n1, n2) &&
                                  n1.Solution.Removed.Contains(n2.Solution.Removed, Comparators.SudokuNumberRowColComparer.Instance) &&
                                  n1.Solution.Stayed.Contains(n2.Solution.Stayed, Comparators.SudokuNumberRowColComparer.Instance) &&
                                  n1.Solution.ColorUnits.Equals(n2.Solution.ColorUnits)
                                  select n2;

                    var sols = uniques.Except(exclude);

                    foreach (var n in sols)
                    {
                        SudokuIntermediateSolution intermediate_solution = new SudokuIntermediateSolution(n.Board, n.NextBoard, n.Solution);

                        intermediate_solution.SaveToFile(dir + Path.DirectorySeparatorChar + n.Solution.Type + Path.DirectorySeparatorChar +
                                                         file_name + " - " + counters[n.Solution.Type]++ + FileExtensions.XmlZipExt);
                    }
                }

                counter.Increment();
                lock (counter)
                {
                    ShowProgress(counter.Value * 70 / files.Length, 70);
                }
            });
        }
        private bool CompareNodes(SudokuSolutionNode a_node, SudokuSolutionNode a_expected_node, FileInfo a_fileInfo,
                                  ConcurrentBag <string> a_list, int add_counter, int remove_counter)
        {
            bool b1 = false;

            IEnumerable <SudokuSolutionNode> solutions_added   = null;
            IEnumerable <SudokuSolutionNode> solutions_removed = null;

            if (!a_node.Nodes.Exact(a_expected_node.Nodes))
            {
                solutions_added   = a_node.Nodes.Substract(a_expected_node.Nodes);
                solutions_removed = a_expected_node.Nodes.Substract(a_node.Nodes);

                if (solutions_removed.Count() > 0)
                {
                    solutions_removed = RemoveIfExistsElsewhere(solutions_removed, a_node.Root);
                }
                else
                {
                    solutions_removed = null;
                }

                if (solutions_added.Count() > 0)
                {
                    solutions_added = RemoveIfExistsElsewhere(solutions_added, a_node.Root);
                }
                else
                {
                    solutions_added = null;
                }
            }

            if (solutions_added != null)
            {
                foreach (var added in solutions_added)
                {
                    if (added.Solution != null)
                    {
                        string dir = a_fileInfo.DirectoryName + Path.DirectorySeparatorChar + "Diffrencies" +
                                     Path.DirectorySeparatorChar + "Added";

                        SudokuIntermediateSolution intermediate_solution =
                            new SudokuIntermediateSolution(added.Board, added.NextBoard, added.Solution);

                        intermediate_solution.SaveToFile(dir + Path.DirectorySeparatorChar +
                                                         Path.GetFileNameWithoutExtension(Path.GetFileNameWithoutExtension(a_fileInfo.FullName)) +
                                                         "_added_" + add_counter + FileExtensions.XmlZipExt);

                        a_list.Add(Path.GetFileNameWithoutExtension(Path.GetFileNameWithoutExtension(a_fileInfo.FullName)) +
                                   "_added_" + add_counter + ": " + intermediate_solution.Solution.ToString());

                        add_counter++;

                        b1 = true;
                    }
                }
            }

            if (solutions_removed != null)
            {
                foreach (var removed in solutions_removed)
                {
                    if (removed.Solution != null)
                    {
                        string dir = a_fileInfo.DirectoryName + Path.DirectorySeparatorChar +
                                     "Diffrencies" + Path.DirectorySeparatorChar + "Removed";

                        SudokuIntermediateSolution intermediate_solution =
                            new SudokuIntermediateSolution(removed.Board, removed.NextBoard, removed.Solution);

                        intermediate_solution.SaveToFile(dir + Path.DirectorySeparatorChar +
                                                         Path.GetFileNameWithoutExtension(Path.DirectorySeparatorChar +
                                                                                          Path.GetFileNameWithoutExtension(a_fileInfo.FullName)) + "_removed_" +
                                                         remove_counter + FileExtensions.XmlZipExt);

                        a_list.Add(Path.GetFileNameWithoutExtension(
                                       Path.GetFileNameWithoutExtension(a_fileInfo.FullName)) + "_removed_" +
                                   remove_counter + ": " + intermediate_solution.Solution.ToString());

                        remove_counter++;

                        b1 = true;
                    }
                }
            }

            var node_next     = ((a_node != null) && a_node.Nodes.Any()) ? a_node.Nodes.First() : null;
            var expected_next = ((a_expected_node != null) && a_expected_node.Nodes.Any()) ?
                                a_expected_node.Nodes.First() : null;

            if ((node_next == null) || (expected_next == null))
            {
                return(b1);
            }

            if (!node_next.Solution.Equals(expected_next.Solution))
            {
                var next = a_node.Nodes.FirstOrDefault(n => n.Solution.Equals(expected_next.Solution));

                if (next == null)
                {
                    next = a_expected_node.Nodes.FirstOrDefault(n => n.Solution.Equals(node_next.Solution));

                    if (next != null)
                    {
                        expected_next = next;
                        expected_next.SolveWithStepAll();
                    }
                    else
                    {
                        return(b1);
                    }
                }
                else
                {
                    node_next = next;
                    node_next.SolveWithStepAll();
                }
            }

            if (node_next.Nodes.Any())
            {
                node_next = node_next.Nodes.First();
            }
            else
            {
                return(b1);
            }

            if (expected_next.Nodes.Any())
            {
                expected_next = expected_next.Nodes.First();
            }
            else
            {
                return(b1);
            }

            bool b2 = CompareNodes(node_next, expected_next, a_fileInfo, a_list, add_counter, remove_counter);

            return(b1 | b2);
        }