#ifndef HELI_PRIVATE_H
#define HELI_PRIVATE_H

#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <math.h>

#define GL_GLEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/glext.h>

#include "common.h"
#include "animation.h"
#include "framebuffer.h"
#include "sprite.h"
#include "font.h"


// globals

#define HELI_PRECISION 1e-6
#define HELI_PRECISION_SQR 1e-12
#define HELI_MIN_FPS 1
#define HELI_MAX_FPS 100
#define HELI_DEFAULT_FPS 24


// blobs

extern char heliBlobDefaultFont[] asm("heliBlobDefaultFont");
extern int heliBlobDefaultFontSize asm("heliBlobDefaultFontSize");
extern char heliBlobUnicodeFont[] asm("heliBlobUnicodeFont");
extern int heliBlobUnicodeFontSize asm("heliBlobUnicodeFontSize");


// string

char* heliStringCopy(const char *x);
char* heliStringCopyLower(const char *x);
char* heliStringConcat(const char *a, const char *b);
char* heliStringConcat3(const char *a, const char *b, const char *c);
int heliStringCompareCi(const char *a, const char *b);
int heliStringCompareNCi(const char *a, const char *b, size_t n);
int heliStringEndsWithLowcase(const char *s, const char *tail);
void heliStringLower(char *x);



// common

void heliColorToDouble(unsigned int code, double *rgba);


// pointer array

typedef void (*HeliFreeCallback)(void*);
typedef void* (*HeliCloneCallback)(const void*);
typedef int (*HeliCompareCallback)(const void*, const void*);

typedef struct _HeliPair {
	void *key;
	void *value;
	HeliFreeCallback freeKey;
	HeliFreeCallback freeValue;
} HeliPair;

typedef struct _HeliArray {
	HeliPair *items;
	int count;
	int allocated;
} HeliArray;

void heliPairInit(HeliPair *p);
void heliPairDestroy(HeliPair *p);

void heliArrayInit(HeliArray *a);
void heliArrayClear(HeliArray *a);
void heliArrayDestroy(HeliArray *a);
HeliPair* heliArrayGet(HeliArray *a, int i);
void* heliArrayGetKey(HeliArray *a, int i);
void* heliArrayGetValue(HeliArray *a, int i);
HeliPair* heliArrayInsert(HeliArray *a, int i, void *v, HeliFreeCallback fv);
HeliPair* heliArrayInsertPair(HeliArray *a, int i, void *k, HeliFreeCallback fk, void *v, HeliFreeCallback fv);
void heliArrayRemove(HeliArray *a, int i);

HeliPair* heliMapFind(HeliArray *a, const void *k, HeliCompareCallback cmp, int *gtOrEqIndex);
HeliPair* heliMapGet(HeliArray *a, const void *k, HeliCompareCallback cmp);
HeliPair* heliMapAdd(
	HeliArray *a, const void *k, HeliCompareCallback cmp,
	HeliCloneCallback ck, HeliFreeCallback fk,
	void *v, HeliFreeCallback fv );
int heliMapRemove(HeliArray *a, const void *k, HeliCompareCallback cmp);

HeliPair* heliUIntFind(HeliArray *a, size_t k, int *gtOrEqIndex);
HeliPair* heliUIntGet(HeliArray *a, size_t k);
HeliPair* heliUIntAdd(HeliArray *a, size_t k, void *v, HeliFreeCallback fv);
int heliUIntRemove(HeliArray *a, size_t k);

HeliPair* heliStringmapFind(HeliArray *a, const char *k, int *gtOrEqIndex);
HeliPair* heliStringmapGet(HeliArray *a, const char *k);
HeliPair* heliStringmapAdd(HeliArray *a, const char *k, void *v, HeliFreeCallback fv);
int heliStringmapRemove(HeliArray *a, const char *k);


// geometry

void heliMatrix4Identity(double *r);
void heliMatrix4Translation(double *r, double x, double y, double z);
void heliMatrix4Scale(double *r, double x, double y, double z);
void heliMatrix4RotationZ(double *r, double a);
void heliMatrix4MultVec(double *r, const double *m, const double *v);
void heliMatrix4Mult(double *r, const double *a, const double *b);
int heliMatrix4Invert(double *r, const double *m);


// gl

typedef struct _HeliGLClipPlaneState {
	int enabled;
	double equation[4];
} HeliGLClipPlaneState;

typedef struct _HeliGLCommonState {
	unsigned int flags;
	double modelviewMatrix[16];
	double projectionMatrix[16];
	double clearColor[4];
	int viewport[4];
	unsigned int framebuffer_read_id;
	unsigned int framebuffer_draw_id;
	HeliGLClipPlaneState clipPlanes[4];
} HeliGLCommonState;

typedef void (APIENTRY *HeliGLBlendFuncSeparatePtr)(GLenum sfactorRGB, GLenum dfactorRGB, GLenum sfactorAlpha, GLenum dfactorAlpha);
typedef void (APIENTRY *HeliGLStencilOpSeparatePtr)(GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass);
typedef void (APIENTRY *HeliGLTexImage2DMultisamplePtr)(GLenum target, GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height, GLboolean fixedsamplelocations);
typedef void (APIENTRY *HeliGLGenFramebuffersPtr)(GLsizei n, GLuint *framebuffers);
typedef void (APIENTRY *HeliGLDeleteFramebuffersPtr)(GLsizei n, const GLuint *framebuffers);
typedef void (APIENTRY *HeliGLBindFramebufferPtr)(GLenum target, GLuint framebuffer);
typedef void (APIENTRY *HeliGLBlitFramebufferPtr)(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter);
typedef void (APIENTRY *HeliGLFramebufferRenderbufferPtr)(GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
typedef void (APIENTRY *HeliGLFramebufferTexture2DPtr)(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
typedef GLenum (APIENTRY *HeliGLCheckFramebufferStatusPtr)(GLenum target);
typedef void (APIENTRY *HeliGLGenRenderbuffersPtr)(GLsizei n, GLuint *renderbuffers);
typedef void (APIENTRY *HeliGLDeleteRenderbuffersPtr)(GLsizei n, const GLuint *renderbuffers);
typedef void (APIENTRY *HeliGLBindRenderbufferPtr)(GLenum target, GLuint renderbuffer);
typedef void (APIENTRY *HeliGLRenderbufferStoragePtr)(GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
typedef void (APIENTRY *HeliGLRenderbufferStorageMultisamplePtr)(GLenum target, GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height);

extern HeliGLBlendFuncSeparatePtr       heliGLBlendFuncSeparatePtr;
extern HeliGLStencilOpSeparatePtr       heliGLStencilOpSeparatePtr;
extern HeliGLTexImage2DMultisamplePtr   heliGLTexImage2DMultisamplePtr;
extern HeliGLGenFramebuffersPtr         heliGLGenFramebuffersPtr;
extern HeliGLDeleteFramebuffersPtr      heliGLDeleteFramebuffersPtr;
extern HeliGLBindFramebufferPtr         heliGLBindFramebufferPtr;
extern HeliGLBlitFramebufferPtr         heliGLBlitFramebufferPtr;
extern HeliGLFramebufferRenderbufferPtr heliGLFramebufferRenderbufferPtr;
extern HeliGLFramebufferTexture2DPtr    heliGLFramebufferTexture2DPtr;
extern HeliGLCheckFramebufferStatusPtr  heliGLCheckFramebufferStatusPtr;
extern HeliGLGenRenderbuffersPtr        heliGLGenRenderbuffersPtr;
extern HeliGLDeleteRenderbuffersPtr     heliGLDeleteRenderbuffersPtr;
extern HeliGLBindRenderbufferPtr        heliGLBindRenderbufferPtr;
extern HeliGLRenderbufferStoragePtr     heliGLRenderbufferStoragePtr;
extern HeliGLRenderbufferStorageMultisamplePtr heliGLRenderbufferStorageMultisamplePtr;

extern unsigned int heliGLWindowFramebufferReadId;
extern unsigned int heliGLWindowFramebufferDrawId;

double heliGLGetAAResolution();
double heliGLGetPixelSize();
int heliGLIsIntegerClipping();
int heliGLTransform(double *x, double *y, int reverse);
void heliGLGetCommonState(HeliGLCommonState *state, unsigned int flags);
void heliGLSetCommonState(const HeliGLCommonState *state);


// all objects

extern int heliInitialized;
extern HeliArray heliObjectsSet;
void heliObjectRegister(void *o, HeliFreeCallback fo);
void heliObjectUnregister(void *o);


// drawing

typedef struct _HeliTextureState {
	Animation animation;
	int fixed;
	double genx[4], geny[4];
} HeliTextureState;

typedef struct _HeliDrawingState {
	unsigned int flags;
	int antialiasing;
	double fillColor[4];
	double strokeColor[4];
	double strokeWidth;
	HAlign horAlign;
	VAlign vertAlign;
	double fontSize;
	Font font;
	HeliTextureState fillTexture;
	HeliTextureState strokeTexture;
	HeliGLCommonState glState;
} HeliDrawingState;

extern HeliArray heliDrawingFramebuffersToFlush;

HeliDrawingState *heliDrawingGetState();
HeliDrawingState *heliDrawingGetStateStack();
void heliDrawingApplyTexture(double *color, HeliTextureState *state);
void heliDrawingResetTexture();
void heliFillRectSimple(double x0, double y0, double x1, double y1, double aaBorder, int antialiasing);
void heliFillCircleSimple(double x, double y, double r, double aaBorder, int antialiasing);
void heliDrawingClearFrame();
void heliDrawingPrepareFrame();
void heliDrawingFinish();


// font

void heliFontFinish();


// animation

void heliAnimationUpdate(double dt);
void heliAnimationFinish();


// collider

typedef struct _HeliCollider {
	Collider type;
	double x;
	double y;
	double radius;
	double width;
	double height;
	double rotation;
	double bounciness;
	double bouncinessThreshold;
} HeliCollider;

typedef struct _HeliCollisionInfo {
	int actualCollision;
	double distance;
	double dx, dy;
	double vx, vy;
	double ax, ay;
} HeliCollisionInfo;

int heliCheckCollision(
	HeliCollider *a, HeliCollider *b,
	HeliCollisionInfo *info,
	double distance );

int heliPointCollision(HeliCollider *c, double x, double y);


// sprite

typedef void (*HeliSpriteEashInt)(Sprite, int);
typedef void (*HeliSpriteEashUInt)(Sprite, unsigned int);
typedef void (*HeliSpriteEashDouble)(Sprite, double);
HeliArray* heliSpriteGetGroups(Sprite sprite);
int heliSpriteCollisionCheck(Sprite a, Sprite b, HeliCollisionInfo *info);
void heliSpriteCollisionApply(Sprite a, Sprite b, HeliCollisionInfo *info);
void heliSpriteDraw(Sprite sprite);
void heliSpriteDrawDebug(Sprite sprite);
void heliSpriteSort(HeliArray *sprites);
void heliSpriteUpdate(double dt);
void heliSpriteFinish();


// sound

void heliSoundUpdate();
void heliSoundFinish();


// window

typedef struct _HeliDialog {
	int shown;
	const char *question;
	char *answer;
	char *passwordText;
	int maxAnswerSize;
	int multiline;
	int password;
	int pos;
	int selPos;
	double scrollX;
	double scrollY;
	int success;
} HeliDialog;

void heliDialogDraw(HeliDialog *dialog);


// test

void heliDoTests();


#endif