#ifndef PUZZLE_H
#define PUZZLE_H


#include "line.h"
#include "tile.h"
#include "phisics.h"


#define PF_RENDERED  (1 << 0)
#define PF_BORDER_L  (1 << 1)
#define PF_BORDER_R  (1 << 2)
#define PF_BORDER_T  (1 << 3)
#define PF_BORDER_B  (1 << 4)
#define PF_HANDLE_L  (1 << 5)
#define PF_HANDLE_R  (1 << 6)
#define PF_HANDLE_T  (1 << 7)
#define PF_HANDLE_B  (1 << 8)

#define PF_BORDERS   (PF_BORDER_L|PF_BORDER_R|PF_BORDER_T|PF_BORDER_B)
#define PF_RENDERING (PF_BORDERS|PF_RENDERED)
#define PF_HANDLES   (PF_HANDLE_L|PF_HANDLE_R|PF_HANDLE_T|PF_HANDLE_B)

#define PCP_BODY     1
#define PCP_EDGE     2

typedef struct Puzzle Puzzle;

typedef struct {
  Puzzle *pz;
  int r, c;
  Tile t;
  PhGroup *parent;
  PhGroup group;
  PhNode nodes[5];
  Flags flags;
} Chunk;

struct Puzzle {
  int rows, cols, turn;
  Vertex **hlines;
  Vertex **vlines;
  
  Physics ph;
  Chunk **chunks;
  int groups;

  Animation image;
  TileMap tm;
  Vec cs;

  Chunk **chunksOrder;
  int activeChunks;
  Vec gmouse;
  int mousefix;
  int longframe;
};


static inline Vec chunkGroupPos(Chunk *c)
  { return vmulv( vadd(vec(c->c, c->r), vecxy(0.5)), c->pz->cs ); }
static inline Vec chunkWorldPos(Chunk *c)
  { return phGroupTrans(c->parent, chunkGroupPos(c)); }
static inline int chunkId(Chunk *c)
  { return c - c->pz->chunks[0]; }
static inline int chunkGid(Chunk *c)
  { return chunkId( (Chunk*)((char*)c->parent - offsetof(Chunk, group)) ); }

  
unsigned int chunkCalcEdges(Chunk *c);
void chunkDrawBase(Chunk *c, unsigned int edges);
void chunkDraw(Chunk *c);
void chunkDrawDebug(Chunk *c);
void chunkRender(Chunk *c);
void chunkMerge(Chunk *a, Chunk *b);
void chunkTryMerge(Chunk *a, int dr, int dc);
Flags chunkCheckPoint(Chunk *c, Vec p);
int chunkCheckEdge(Chunk *c, Vec p);


void puzzleAlloc(Puzzle *pz, int rows, int cols);
void puzzleFree(Puzzle *pz);
void puzzleClearImages(Puzzle *pz);
void puzzleGenLines(Puzzle *pz, double cellw, double cellh, double jitter, double depth);
void puzzleRecalcGroups(Puzzle *pz);
void puzzleGenChunks(Puzzle *pz);
void puzzleRenderChunks(Puzzle *pz, int size, double m);
int puzzlePopupGroup(Puzzle *pz, PhGroup *g);
int puzzleChooseChunks(Puzzle *pz, Vec mouse);
void puzzleReleaseChunks(Puzzle *pz);
void puzzleUpdate(Puzzle *pz, Vec hs, Vec mouse);


#endif