#include "doomdata.h"
#include "workdata.h"
#include "tarray.h"

class FNodeBuilder
{
	struct FPrivSeg
	{
		int v1, v2;
		int sidedef;
		int linedef;
		int frontsector;
		int backsector;
		int next;
		int nextforvert;
		int loopnum;	// loop number for split avoidance (0 means splitting is okay)
		angle_t angle;
		fixed_t offset;

		int planenum;
		FPrivSeg *hashnext;
	};
	struct FPrivVert
	{
		fixed_t x, y;
		WORD segs;		// segs that use this vertex as v1

		bool operator== (const FPrivVert &other)
		{
			return x == other.x && y == other.y;
		}
	};
	union USegPtr
	{
		int SegNum;
		FPrivSeg *SegPtr;
	};
public:
	struct FPolyStart
	{
		int polynum;
		fixed_t x, y;
	};

	FNodeBuilder (FLevel &level,
		TArray<FPolyStart> &polyspots, TArray<FPolyStart> &anchors,
		const char *name);

	void GetVertices (WideVertex *&verts, int &count);
	void GetSegs (MapSeg *&segs, int &count);
	void GetNodes (MapNode *&nodes, int &count);
	void GetSubsectors (MapSubsector *&ssecs, int &count);

private:
	TArray<node_t> Nodes;
	TArray<MapSubsector> Subsectors;
	TArray<FPrivSeg> Segs;
	TArray<FPrivVert> Vertices;
	TArray<USegPtr> SegList;
	TArray<BYTE> PlaneChecked;

	TArray<int> Touched;	// Loops a splitter touches on a vertex
	TArray<int> Colinear;	// Loops with edges colinear to a splitter 

	FLevel &Level;

	// Progress meter stuff
	int SegsStuffed;
	const char *MapName;

	void FindUsedVertices (WideVertex *vertices, int max);
	void BuildTree ();
	void MakeSegsFromSides ();
	void GroupSegPlanes ();
	void FindPolyContainers (TArray<FPolyStart> &spots, TArray<FPolyStart> &anchors);
	bool GetPolyExtents (int polynum, fixed_t bbox[4]);
	int MarkLoop (int firstseg, int loopnum);
	void AddSegToBBox (fixed_t bbox[4], const FPrivSeg *seg);
	int CreateNode (WORD set, fixed_t bbox[4]);
	int CreateSubsector (WORD set, fixed_t bbox[4]);
	bool CheckSubsector (WORD set, node_t &node, int setsize);
	int SelectSplitter (WORD set, node_t &node, int step, bool nosplit);
	void SplitSegs (WORD set, node_t &node, WORD &outset0, WORD &outset1);
	int Heuristic (node_t &node, WORD set, bool honorNoSplit);
	int ClassifyLine (node_t &node, const FPrivSeg *seg, int &sidev1, int &sidev2);
	int CountSegs (WORD set) const;

	static int SortSegs (const void *a, const void *b);

	//  < 0 : in front of line
	// == 0 : on line
	//  > 0 : behind line

	inline int PointOnSide (int x, int y, int x1, int y1, int dx, int dy);
	fixed_t InterceptVector (const node_t &splitter, const FPrivSeg &seg);

	void PrintSet (int l, WORD set);
};