public bool Evaluate(
SolverState state,
ISolverQueue queue,
ISolverPool pool,
ISolverPool solutionPool,
SolverNode node)
{
if (node.HasChildren)
{
throw new InvalidOperationException();
}
node.Status = SolverNodeStatus.Evaluting;
var toEnqueue = new List <SolverNode>();
var solution = false;
foreach (var move in node.MoveMap.TruePositions())
{
foreach (var dir in VectorInt2.Directions)
{
var p = move;
var pp = p + dir;
var ppp = pp + dir;
if (node.CrateMap[pp] && // crate to push
state.StaticMaps.FloorMap[ppp] && !node.CrateMap[ppp] && // into free space?
!state.StaticMaps.DeadMap[ppp]) // Valid Push
{
EvaluateValidPush(state, pool, solutionPool, node, pp, ppp, p, dir, toEnqueue, ref solution);
}
}
}
if (solution)
{
node.Status = SolverNodeStatus.SolutionPath;
}
else if (node.HasChildren)
{
node.Status = SolverNodeStatus.Evaluted;
state.Statistics.TotalDead += node.CheckDead(); // Children may be evaluated as dead already
}
else
{
node.Status = SolverNodeStatus.Dead;
state.Statistics.TotalDead++;
if (node.Parent != null)
{
state.Statistics.TotalDead += node.Parent.CheckDead();
}
}
queue.Enqueue(toEnqueue);
pool.Add(toEnqueue);
return(solution);
}
private void GenerateReports(SolverState state, ISolver solver)
{
// var r = state.Command.Report;
// if (r == null) return;
//
// var renderer = new MapToReportingRendererText();
// var finalStats = solver.Statistics;
// if (finalStats != null)
// {
// r.WriteLine("### Statistics ###");
//
//
// MapToReporting.Create<SolverStatistics>()
// .AddColumn("Name", x=>x.Name)
// .AddColumn("Nodes", x=>x.TotalNodes)
// .AddColumn("Avg. Speed", x=>x.NodesPerSec)
// .AddColumn("Duration (sec)", x=>x.DurationInSec)
// .AddColumn("Duplicates", x=>x.Duplicates < 0 ? null : (int?)x.Duplicates)
// .AddColumn("Dead", x=>x.TotalDead < 0 ? null : (int?)x.TotalDead)
// .AddColumn("Current Depth", x=>x.DepthCurrent < 0 ? null : (int?)x.DepthCurrent)
// .RenderTo(finalStats, renderer, r);
// }
//
// var repDepth = MapToReporting.Create<SolverHelper.DepthLineItem>()
// .AddColumn("Depth", x => x.Depth)
// .AddColumn("Total", x => x.Total)
// .AddColumn("Growth Rate", x => x.GrowthRate)
// .AddColumn("UnEval", x => x.UnEval)
// .AddColumn("Complete", x => (x.Total - x.UnEval) *100 / x.Total, c=>c.ColumnInfo.AsPercentage());
//
// if (state is MultiThreadedSolverState multi)
// {
// r.WriteLine("### Forward Tree ###");
// repDepth.RenderTo(SolverHelper.ReportDepth(multi.Root), renderer, r);
//
// r.WriteLine("### Reverse Tree ###");
// repDepth.RenderTo(SolverHelper.ReportDepth(multi.RootReverse), renderer, r);
// }
// else if (state is SingleThreadedForwardReverseSolver.State sts)
// {
// r.WriteLine("### Forward Tree ###");
// repDepth.RenderTo(SolverHelper.ReportDepth(sts.Forward?.Root), renderer, r);
//
// r.WriteLine("### Reverse Tree ###");
// repDepth.RenderTo(SolverHelper.ReportDepth(sts.Reverse?.Root), renderer, r);
// }
// else if (state is SolverBaseState sb)
// {
// r.WriteLine("### Forward Tree ###");
// repDepth.RenderTo(SolverHelper.ReportDepth(sb.Root), renderer, r);
// }
// else
// {
// // ?
// }
}
public override bool Evaluate(SolverState state, ISolverQueue queue, ISolverPool myPool,
ISolverPool solutionPool, SolverNode node)
{
if (node.HasChildren)
{
throw new InvalidOperationException();
}
node.Status = SolverNodeStatus.Evaluting;
var solution = false;
var toEnqueue = new List <SolverNode>(); // TODO: Could be reused
var toPool = new List <SolverNode>(); // TODO: Could be reused
foreach (var move in node.MoveMap.TruePositions())
{
foreach (var dir in VectorInt2.Directions)
{
var p = move;
var pc = p + dir;
var pp = p - dir;
if (node.CrateMap[pc] && // crate to push
state.StaticMaps.FloorMap[pp] && !node.CrateMap[p] &&
!CheckDeadReverse(state, pp))
{
EvaluateValidPull(state, myPool, solutionPool, node, pc, p, pp, toEnqueue, toPool, ref solution);
}
}
}
if (solution)
{
node.Status = SolverNodeStatus.SolutionPath;
}
else if (node.HasChildren)
{
node.Status = SolverNodeStatus.Evaluted;
state.Statistics.TotalDead += node.CheckDead(); // Children may be evaluated as dead already
}
else
{
node.Status = SolverNodeStatus.Dead;
state.Statistics.TotalDead++;
if (node.Parent != null)
{
state.Statistics.TotalDead += node.Parent.CheckDead();
}
}
queue.Enqueue(toEnqueue);
myPool.Add(toEnqueue);
return(solution);
}
public static void GetSolutions(SolverState state, bool check)
{
var walls = state.Command.Puzzle.ToMap(state.Command.Puzzle.Definition.Wall);
state.Solutions = new List <Path>();
if (state.SolutionsNodes != null)
{
state.Solutions.AddRange(state.SolutionsNodes.Select(x => ConvertSolutionNodeToPath(x, walls, state.Command.Puzzle)));
}
if (state.SolutionsNodesReverse != null)
{
foreach (var tuple in state.SolutionsNodesReverse)
{
var rev = ConvertReverseNodeToPath(tuple.ReverseNode, walls);
var fwd = ConvertForwardNodeToPath(tuple.ForwardNode, walls);
var bridge = PathFinder.Find(walls.BitwiseOR(tuple.ForwardNode.CrateMap),
tuple.ForwardNode.PlayerAfter, tuple.ReverseNode.PlayerAfter);
//Console.WriteLine("Forward Leg: {0}", fwd);
//Console.WriteLine("Reverse Leg: {0}", rev);
//Console.WriteLine("Bridge {0} => {1}", tuple.ForwardNode.ToStringDebugPositions(),
// tuple.ReverseNode.ToStringDebugPositions());
var p = new Path();
p.AddRange(fwd);
p.AddRange(bridge);
p.AddRange(rev);
state.Solutions.Add(p);
}
}
if (check && state.Solutions.Any())
{
int cc = 0;
foreach (var pathSolution in state.Solutions.ToArray())
{
cc++;
if (!CheckSolution(state.Command.Puzzle, pathSolution, out var error))
{
state.SolutionsInvalid ??= new List <(Path, string)>();
state.SolutionsInvalid.Add((pathSolution, error));
state.Solutions.Remove(pathSolution);
if (state.Command.Report != null)
{
state.Command.Report.WriteLine($"Solution #{cc++} [{(check ? "Valid" : "INVALID!" + error)}] =>\n{pathSolution}");
}
}
}
}
}
public void Update(ISolver caller, SolverState state, SolverStatistics global, string txt)
{
var dt = DateTime.Now - last;
if (dt.TotalSeconds < sampleRateInSec)
{
return;
}
last = DateTime.Now;
UpdateInner(caller, state, global, txt);
}
private bool CheckValidSolutions(SolverState state, SolverNode posibleSolution)
{
var b = state.StaticMaps.WallMap.BitwiseOR(state.StaticMaps.CrateStart);
var f = state.Command.Puzzle.Player.Position;
var path = posibleSolution.PathToRoot();
path.Reverse();
var start = path[0];
var t = start.PlayerAfter;
var first = PathFinder.Find(b, f, t);
return(first != null);
}
protected override string Render(ISolver caller, SolverState state, SolverStatistics global, string txt)
{
if (global == null)
{
return(null);
}
var totalMemory = System.GC.GetTotalMemory(false);
var delta = (prev != null) ? global.TotalNodes - prev.TotalNodes : global.TotalNodes;
var sb = new FluentString()
.Append(txt)
.Sep()
.Append($"delta:{delta:#,##0}")
.Sep()
.Append($"mem({Humanise.SizeSuffix((ulong) totalMemory)} used")
.Block(b =>
{
if (DevHelper.TryGetTotalMemory(out var avail))
{
b.Sep();
b.Append($"{Humanise.SizeSuffix(avail)} avail");
}
})
.Append(")");
var telText = new FluentString(",")
.Append(global.DurationInSec.ToString()).Sep()
.Append(global.TotalNodes.ToString()).Sep()
.Append(global.NodesPerSec.ToString()).Sep()
.Append(delta.ToString()).Sep()
.Append(totalMemory.ToString()).Sep()
;
tele.WriteLine(telText);
prev = new SolverStatistics(global);
return(sb);
}
public static string GenerateSummary(SolverState state)
{
if (state == null)
{
throw new ArgumentNullException("state");
}
var sb = new StringBuilder();
var nodePerSec = (double)state.Statistics.TotalNodes / state.Statistics.DurationInSec;
sb.Append(state.Exit.ToString().PadRight(20));
if (state.Exception != null)
{
var ex = state.Exception is AggregateException agg
? agg.InnerExceptions.First()
: state.Exception;
if (ex is NullReferenceException)
{
sb.Append("[NULL] " + StringUtil.ToLines(ex.StackTrace).First().TrimStart('\t').Trim());
}
else
{
sb.Append(StringUtil.Truncate(StringUtil.StripLineFeeds($"[{ex.GetType().Name}] {ex.Message}"), 180));
}
return(sb.ToString());
}
sb.Append($" {state.Statistics.TotalNodes,12:#,##0} nodes at {nodePerSec,6:#,##0}/s in {state.Statistics.Elapsed.Humanize()}.");
if (state.HasSolution)
{
var d = state.SolutionsNodes != null ? state.SolutionsNodes.Count : 0;
var r = state.SolutionsNodesReverse != null ? state.SolutionsNodesReverse.Count : 0;
sb.AppendFormat(" {0} solutions.", d + r);
}
if (state.SolutionsInvalid != null && state.SolutionsInvalid.Count > 0)
{
sb.Append(" !INVALID SOLUTIONS!");
}
return(sb.ToString());
}
private void GenerateReports(SolverState state, ISolver solver)
{
var r = state.Command.Report;
if (r == null)
{
return;
}
var renderer = new MapToReportingRendererText();
var finalStats = solver.Statistics;
if (finalStats != null)
{
r.WriteLine("### Statistics ###");
MapToReporting.Create <SolverStatistics>()
.AddColumn("Name", x => x.Name)
.AddColumn("Nodes", x => x.TotalNodes)
.AddColumn("Avg. Speed", x => x.NodesPerSec)
.AddColumn("Duration (sec)", x => x.DurationInSec)
.AddColumn("Duplicates", x => x.Duplicates < 0 ? null : (int?)x.Duplicates)
.AddColumn("Dead", x => x.TotalDead < 0 ? null : (int?)x.TotalDead)
.AddColumn("Current Depth", x => x.DepthCurrent < 0 ? null : (int?)x.DepthCurrent)
.RenderTo(finalStats, renderer, Report);
}
var repDepth = MapToReporting.Create <SolverHelper.DepthLineItem>()
.AddColumn("Depth", x => x.Depth)
.AddColumn("Total", x => x.Total)
.AddColumn("UnEval", x => x.UnEval)
.AddColumn("Complete", x => (x.Total - x.UnEval) * 100 / x.Total, c => c.ColumnInfo.AsPercentage());
if (state is MultiThreadedSolverState multi)
{
r.WriteLine("### Forward Tree ###");
repDepth.RenderTo(SolverHelper.ReportDepth(multi.Root), renderer, r);
r.WriteLine("### Reverse Tree ###");
repDepth.RenderTo(SolverHelper.ReportDepth(multi.RootReverse), renderer, r);
}
}
private void NewSolutionChain(SolverState state, out bool solution, SolverNode newKid, SolverNode match)
{
solution = true;
state.SolutionsNodesReverse ??= new List <SolutionChain>();
var pair = new SolutionChain
{
ForwardNode = newKid,
ReverseNode = match,
FoundUsing = this
};
state.SolutionsNodesReverse.Add(pair);
state.Command.Debug.Raise(this, SolverDebug.Solution, pair);
foreach (var n in newKid.PathToRoot().Union(match.PathToRoot()))
{
n.Status = SolverNodeStatus.SolutionPath;
}
newKid.Status = SolverNodeStatus.Solution;
match.Status = SolverNodeStatus.Solution;
}
public IEnumerable <(string name, string text)> GetTypeDescriptorProps(SolverState state) =>
public virtual IEnumerable <(string name, string text)> GetTypeDescriptorProps(SolverState state) => ImmutableArray <(string name, string text)> .Empty;
public IEnumerable <(string name, string text)> GetTypeDescriptorProps(SolverState state) => throw new NotSupportedException();
public ExitConditions.Conditions Solve(SolverState state)
{
var full = (MultiThreadedSolverState)state;
var allTasks = full.Workers.Select(x => (Task)x.Task).ToArray();
var cancel = state.Command.CancellationToken;
// Start and wait
full.IsRunning = true;
foreach (var worker in full.Workers)
{
worker.Task.Start();
}
Task statisticsTick = null;
if (state.Command.AggProgress != null)
{
// Setup global/aggregate statistics and updates
statisticsTick = Task.Run(() =>
{
while (full.IsRunning)
{
Thread.Sleep(1000);
state.Statistics.TotalNodes = current.PoolForward.Statistics.TotalNodes
+ current.PoolReverse.Statistics.TotalNodes;
var txt = new FluentString()
.Append($"==> {state.Statistics.ToString(false, true)}")
.Append($" Fwd({current.PoolForward.Statistics.TotalNodes:#,##0}|{current.QueueForward.Statistics.TotalNodes:#,##0})")
.Append($" Rev({current.PoolReverse.Statistics.TotalNodes:#,##0}|{current.QueueReverse.Statistics.TotalNodes:#,##0})");
state.Command.AggProgress.Update(this, state, state.Statistics, txt);
}
if (state.Command.AggProgress is IDisposable dp)
{
dp.Dispose();
}
});
}
if (!Task.WaitAll(allTasks, (int)state.Command.ExitConditions.Duration.TotalMilliseconds, cancel))
{
// Close down the workers as gracefully as possible
state.Command.ExitConditions.ExitRequested = true;
// Allow them to process the ExitRequested
Thread.Sleep((int)TimeSpan.FromSeconds(1).TotalMilliseconds);
// Close down any outlyers
foreach (var task in allTasks)
{
if (task.Status == TaskStatus.Running)
{
if (!task.Wait((int)TimeSpan.FromSeconds(1).TotalMilliseconds))
{
task.Dispose();
}
}
}
state.Exit = ExitConditions.Conditions.TimeOut;
}
full.IsRunning = false;
statisticsTick?.Wait();
state.Statistics.Completed = DateTime.Now;
foreach (var stat in current.StatsInner)
{
stat.Completed = state.Statistics.Completed;
}
// Get solutions & Exit Conditions & Errors
var errors = full.Workers.Select(x => x.WorkerState.Exception).Where(x => x != null).ToList();
if (errors.Any())
{
throw new AggregateException(errors);
}
foreach (var worker in full.Workers)
{
worker.WorkerState.Statistics.Completed = state.Statistics.Completed;
// Bubble up exit to owner
state.Command.Report?.WriteLine($"WorkerExit: {worker.Name} -> {worker.WorkerState.Exit}");
if (state.Exit == ExitConditions.Conditions.InProgress &&
(worker.WorkerState.Exit != ExitConditions.Conditions.InProgress && worker.WorkerState.Exit != ExitConditions.Conditions.Aborted))
{
state.Exit = worker.WorkerState.Exit;
}
if (worker.WorkerState.HasSolution)
{
if (worker.WorkerState.SolutionsNodes != null)
{
full.SolutionsNodes ??= new List <SolverNode>();
full.SolutionsNodes.AddRange(worker.WorkerState.SolutionsNodes);
state.Exit = ExitConditions.Conditions.Solution;
}
if (worker.WorkerState.SolutionsNodesReverse != null)
{
full.SolutionsNodesReverse ??= new List <SolutionChain>();
full.SolutionsNodesReverse.AddRange(worker.WorkerState.SolutionsNodesReverse);
state.Exit = ExitConditions.Conditions.Solution;
}
}
}
// Update stats
state.Statistics.TotalNodes = current.PoolForward.Statistics.TotalNodes
+ current.PoolReverse.Statistics.TotalNodes;
SolverHelper.GetSolutions(state, true);
if (state.Exit == ExitConditions.Conditions.Continue)
{
state.Exit = full.Workers.Select(x => x.WorkerState.Exit)
.GroupBy(x => x)
.OrderBy(x => x.Count())
.First().Key;
}
return(state.Exit);
}
private int StoreAttempt(ISolver solver, LibraryPuzzle dto, SolverState state, string desc)
{
var best = state.Solutions?.OrderBy(x => x.Count).FirstOrDefault();
var sol = new SolutionDTO
{
IsAutomated = true,
PuzzleIdent = dto.Ident.ToString(),
Path = best?.ToString(),
Created = DateTime.Now,
Modified = DateTime.Now,
MachineName = Environment.MachineName,
MachineCPU = DevHelper.DescribeCPU(),
SolverType = solver.GetType().Name,
SolverVersionMajor = solver.VersionMajor,
SolverVersionMinor = solver.VersionMinor,
SolverDescription = solver.VersionDescription,
TotalNodes = solver.Statistics.First().TotalNodes,
TotalSecs = solver.Statistics.First().DurationInSec,
Description = desc
};
var exists = Repository.GetPuzzleSolutions(dto.Ident);
if (exists != null && exists.Any())
{
var onePerMachine = exists.FirstOrDefault(x => x.MachineName == sol.MachineName && x.SolverType == sol.SolverType);
if (onePerMachine != null)
{
if (sol.HasSolution)
{
if (!onePerMachine.HasSolution)
{
sol.SolutionId = onePerMachine.SolutionId; // replace
Repository.Store(sol);
return(sol.SolutionId);
}
else if (sol.TotalNodes < onePerMachine.TotalSecs)
{
sol.SolutionId = onePerMachine.SolutionId; // replace
Repository.Store(sol);
return(sol.SolutionId);
}
else
{
// drop
}
}
else
{
if (!onePerMachine.HasSolution && sol.TotalNodes > onePerMachine.TotalNodes)
{
sol.SolutionId = onePerMachine.SolutionId; // replace
Repository.Store(sol);
return(sol.SolutionId);
}
}
}
else
{
Repository.Store(sol);
return(sol.SolutionId);
}
}
else
{
Repository.Store(sol);
return(sol.SolutionId);
}
return(-1);
}
public abstract bool Evaluate(SolverState state, ISolverQueue queue, ISolverPool pool, ISolverPool solutionPool, SolverNode node);
protected abstract void UpdateInner(ISolver caller, SolverState state, SolverStatistics global, string txt);
private bool EvaluateValidPush(
SolverState state,
ISolverPool pool,
ISolverPool reversePool,
SolverNode node,
VectorInt2 pp,
VectorInt2 ppp,
VectorInt2 p,
VectorInt2 push,
List <SolverNode> toEnqueue,
ref bool solution)
{
state.Statistics.TotalNodes++;
var newKid = nodeFactory.CreateFromPush(node, node.CrateMap, state.StaticMaps.WallMap, p, pp, ppp, push);
// Cycle Check: Does this node exist already?
var dup = pool.FindMatch(newKid);
if (dup != null)
{
if (object.ReferenceEquals(dup, newKid))
{
throw new InvalidDataException();
}
if (dup.SolverNodeId == newKid.SolverNodeId)
{
throw new InvalidDataException();
}
// Duplicate
newKid.Status = SolverNodeStatus.Duplicate;
state.Statistics.Duplicates++;
if (state.Command.DuplicateMode == DuplicateMode.AddAsChild)
{
node.Add(newKid);
newKid.Duplicate = dup;
}
else if (state.Command.DuplicateMode == DuplicateMode.ReuseInPool)
{
nodeFactory.ReturnInstance(newKid); // Add to pool for later re-use?
}
else // DuplicateMode.Discard
{
}
}
else
{
node.Add(newKid);
// If there is a reverse solver, checks its pool for a match, hence a Forward <-> Reverse chain, hence a solution
var match = reversePool?.FindMatch(newKid);
if (match != null)
{
// Solution!
NewSolutionChain(state, out solution, newKid, match);
if (state.Command.ExitConditions.StopOnSolution)
{
return(true);
}
}
else
{
if (DeadMapAnalysis.DynamicCheck(state.StaticMaps, node))
{
newKid.Status = SolverNodeStatus.Dead;
state.Statistics.TotalDead++;
}
else
{
toEnqueue.Add(newKid);
if (newKid.IsSolutionForward(state.StaticMaps))
{
// Solution
solution = true;
state.SolutionsNodes.Add(newKid);
state.Command.Debug.Raise(this, SolverDebug.Solution, newKid);
foreach (var n in newKid.PathToRoot())
{
n.Status = SolverNodeStatus.SolutionPath;
}
newKid.Status = SolverNodeStatus.Solution;
if (state.Command.ExitConditions.StopOnSolution)
{
return(true);
}
}
}
}
}
return(false);
}
private bool EvaluateValidPull(
SolverState state,
ISolverPool myPool,
ISolverPool solutionPool,
SolverNode node,
VectorInt2 pc,
VectorInt2 p,
VectorInt2 pp,
List <SolverNode> toEnqueue,
ref bool solution)
{
state.Statistics.TotalNodes++;
var newKid = nodeFactory.CreateFromPull(node, node.CrateMap, state.StaticMaps.WallMap, pc, p, pp);
// Cycle Check: Does this node exist already?
var dup = myPool.FindMatch(newKid);
if (dup != null)
{
if (object.ReferenceEquals(dup, newKid))
{
throw new InvalidDataException();
}
if (dup.SolverNodeId == newKid.SolverNodeId)
{
throw new InvalidDataException();
}
// Duplicate
newKid.Status = SolverNodeStatus.Duplicate;
state.Statistics.Duplicates++;
if (state.Command.DuplicateMode == DuplicateMode.AddAsChild)
{
node.Add(newKid);
newKid.Duplicate = dup;
}
else if (state.Command.DuplicateMode == DuplicateMode.ReuseInPool)
{
nodeFactory.ReturnInstance(newKid); // Add to pool for later re-use?
}
else // DuplicateMode.Discard
{
}
}
else
{
var match = solutionPool?.FindMatch(newKid);
if (match != null)
{
// Add to tree / itterator
node.Add(newKid);
// Solution
state.SolutionsNodesReverse ??= new List <SolutionChain>();
var pair = new SolutionChain
{
ForwardNode = match,
ReverseNode = newKid,
FoundUsing = this
};
state.SolutionsNodesReverse.Add(pair);
solution = true;
state.Command.Debug.Raise(this, SolverDebug.Solution, pair);
foreach (var n in newKid.PathToRoot().Union(match.PathToRoot()))
{
n.Status = SolverNodeStatus.SolutionPath;
}
newKid.Status = SolverNodeStatus.Solution;
match.Status = SolverNodeStatus.Solution;
if (state.Command.ExitConditions.StopOnSolution)
{
return(true);
}
}
else
{
// Add to tree / iterator
node.Add(newKid); // Thread-safe: As all kids get created in this method (forward / reverse)
if (DeadMapAnalysis.DynamicCheck(state.StaticMaps, node))
{
newKid.Status = SolverNodeStatus.Dead;
}
else
{
toEnqueue.Add(newKid);
if (newKid.IsSolutionReverse(state.StaticMaps))
{
// Possible Solution: Did we start in a valid position
if (CheckValidSolutions(state, newKid))
{
state.SolutionsNodes.Add(newKid);
state.Command.Debug.Raise(this, SolverDebug.Solution, newKid);
solution = true;
foreach (var n in newKid.PathToRoot())
{
n.Status = SolverNodeStatus.SolutionPath;
}
newKid.Status = SolverNodeStatus.Solution;
}
else
{
// We started in the wrong place; ignore and continue
}
}
}
}
}
return(false);
}
private bool CheckDeadReverse(SolverState state, VectorInt2 ppp)
{
return(false);
return(state.StaticMaps.DeadMap[ppp]);
}
protected abstract string Render(ISolver caller, SolverState state, SolverStatistics global, string txt);
private bool EvaluateValidPull(
SolverState state,
ISolverPool pool,
ISolverPool solutionPool,
SolverNode node,
VectorInt2 pc,
VectorInt2 p,
VectorInt2 pp,
List <SolverNode> toEnqueue,
List <SolverNode> toPool,
ref bool solution)
{
state.Statistics.TotalNodes++;
var newKid = nodeFactory.CreateFromPull(node, node.CrateMap, state.StaticMaps.WallMap, pc, p, pp);
if (state.Command.Inspector != null && state.Command.Inspector(newKid))
{
state.Command.Report?.WriteLine(newKid.ToString());
}
// Cycle Check: Does this node exist already?
var dup = pool.FindMatch(newKid);
if (SafeMode && dup == null)
{
dup = ConfirmDupLookup(pool, node, toEnqueue, newKid); // Fix or Throw
}
if (dup != null)
{
if (object.ReferenceEquals(dup, newKid))
{
throw new InvalidDataException();
}
if (dup.SolverNodeId == newKid.SolverNodeId)
{
throw new InvalidDataException();
}
// Duplicate
newKid.Status = SolverNodeStatus.Duplicate;
state.Statistics.Duplicates++;
if (state.Command.DuplicateMode == DuplicateMode.AddAsChild)
{
node.Add(newKid);
if (newKid is ISolverNodeDuplicateLink dupLink)
{
dupLink.Duplicate = dup;
}
}
else if (state.Command.DuplicateMode == DuplicateMode.ReuseInPool)
{
nodeFactory.ReturnInstance(newKid); // Add to pool for later re-use?
}
else // DuplicateMode.Discard
{
}
}
else
{
// These two should always be the same
node.Add(newKid); toPool.Add(newKid);
// If there is a reverse solver, checks its pool for a match, hence a Forward <-> Reverse chain, hence a solution
var match = solutionPool?.FindMatch(newKid);
if (match != null)
{
// Solution
state.SolutionsNodesReverse ??= new List <SolutionChain>();
var pair = new SolutionChain
{
ForwardNode = match,
ReverseNode = newKid,
FoundUsing = this
};
state.SolutionsNodesReverse.Add(pair);
solution = true;
state.Command.Debug.Raise(this, SolverDebug.Solution, pair);
foreach (var n in newKid.PathToRoot().Union(match.PathToRoot()))
{
n.Status = SolverNodeStatus.SolutionPath;
}
newKid.Status = SolverNodeStatus.Solution;
match.Status = SolverNodeStatus.Solution;
if (state.Command.ExitConditions.StopOnSolution)
{
return(true);
}
}
else
{
if (DeadMapAnalysis.DynamicCheck(state.StaticMaps, node))
{
newKid.Status = SolverNodeStatus.Dead;
}
else
{
toEnqueue.Add(newKid);
if (newKid.IsSolutionReverse(state.StaticMaps))
{
// Possible Solution: Did we start in a valid position
if (CheckValidSolutions(state, newKid))
{
state.SolutionsNodes.Add(newKid);
state.Command.Debug.Raise(this, SolverDebug.Solution, newKid);
solution = true;
foreach (var n in newKid.PathToRoot())
{
n.Status = SolverNodeStatus.SolutionPath;
}
newKid.Status = SolverNodeStatus.Solution;
}
else
{
// We started in the wrong place; ignore and continue
}
}
}
}
}
return(false);
}
