/*
*
*   This program is free software; you can redistribute it and/or modify it
*   under the terms of the GNU General Public License as published by the
*   Free Software Foundation; either version 2 of the License, or (at
*   your option) any later version.
*
*   This program is distributed in the hope that it will be useful, but
*   WITHOUT ANY WARRANTY; without even the implied warranty of
*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
*   General Public License for more details.
*
*   You should have received a copy of the GNU General Public License
*   along with this program; if not, write to the Free Software Foundation,
*   Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*
*   In addition, as a special exception, the author gives permission to
*   link the code of this program with the Half-Life Game Engine ("HL
*   Engine") and Modified Game Libraries ("MODs") developed by Valve,
*   L.L.C ("Valve").  You must obey the GNU General Public License in all
*   respects for all of the code used other than the HL Engine and MODs
*   from Valve.  If you modify this file, you may extend this exception
*   to your version of the file, but you are not obligated to do so.  If
*   you do not wish to do so, delete this exception statement from your
*   version.
*
*/

#pragma once

#define SF_PATH_DISABLED      BIT(0)
#define SF_PATH_FIREONCE      BIT(1)
#define SF_PATH_ALTREVERSE    BIT(2)
#define SF_PATH_DISABLE_TRAIN BIT(3)
#define SF_PATH_ALTERNATE     BIT(15)

class CPathTrack: public CPointEntity
{
public:
	virtual void Spawn();
	virtual void KeyValue(KeyValueData* pkvd);
	virtual int Save(CSave &save);
	virtual int Restore(CRestore &restore);
	virtual void Activate();
	virtual void Use(CBaseEntity *pActivator, CBaseEntity *pCaller, USE_TYPE useType, float value);

	void SetPrevious(CPathTrack *pprevious);
	void Link();

	// Returns ppath if enabled, NULL otherwise
	CPathTrack *ValidPath(CPathTrack *ppath, int testFlag);
	void Project(CPathTrack *pstart, CPathTrack *pend, Vector *origin, float dist);

	static CPathTrack *Instance(edict_t *pent);

	CPathTrack *LookAhead(Vector *origin, float dist, int move);
	CPathTrack *Nearest(Vector origin);

	CPathTrack *GetNext();
	CPathTrack *GetPrevious();

public:
	static TYPEDESCRIPTION IMPL(m_SaveData)[5];

	float m_length;
	string_t m_altName;
	CPathTrack *m_pnext;
	CPathTrack *m_pprevious;
	CPathTrack *m_paltpath;
};

const float TRAIN_STARTPITCH = 60.0f;
const float TRAIN_MAXPITCH   = 200.0f;
const float TRAIN_MAXSPEED   = 1000.0f;

#define SF_TRACKTRAIN_NOPITCH     BIT(0)
#define SF_TRACKTRAIN_NOCONTROL   BIT(1)
#define SF_TRACKTRAIN_FORWARDONLY BIT(2)
#define SF_TRACKTRAIN_PASSABLE    BIT(3)

class CFuncTrackTrain: public CBaseEntity
{
public:
	virtual void Spawn();
	virtual void Precache();
	virtual void Restart();
	virtual void KeyValue(KeyValueData* pkvd);
	virtual int Save(CSave &save);
	virtual int Restore(CRestore &restore);
	virtual int ObjectCaps() { return (CBaseEntity::ObjectCaps() & ~FCAP_ACROSS_TRANSITION) | FCAP_DIRECTIONAL_USE; }
	virtual void OverrideReset();
	virtual BOOL OnControls(entvars_t *pev);
	virtual void Use(CBaseEntity *pActivator, CBaseEntity *pCaller, USE_TYPE useType, float value);
	virtual void Blocked(CBaseEntity *pOther);

public:
	void EXPORT Next();
	void EXPORT Find();
	void EXPORT NearestPath();
	void EXPORT DeadEnd();

	void NextThink(float thinkTime, BOOL alwaysThink);
	void SetTrack(CPathTrack *track) { m_ppath = track->Nearest(pev->origin); }
	void SetControls(entvars_t *pevControls);
	void StopSound();
	void UpdateSound();

	static CFuncTrackTrain *Instance(edict_t *pent);
	static TYPEDESCRIPTION IMPL(m_SaveData)[12];

	CPathTrack *m_ppath;
	float m_length;
	float m_height;
	float m_speed;
	float m_dir;
	float m_startSpeed;
	Vector m_controlMins;
	Vector m_controlMaxs;
	int m_soundPlaying;
	int m_sounds;
	float m_flVolume;
	float m_flBank;
	float m_oldSpeed;
	float m_fTurnAngle;
	float m_flSteeringWheelDecay;
	float m_flAcceleratorDecay;

private:
	unsigned short m_usAdjustPitch;
};

class CFuncVehicle: public CBaseEntity
{
public:
	virtual void Spawn();
	virtual void Precache();
	virtual void Restart();
	virtual void KeyValue(KeyValueData *pkvd);
	virtual int Save(CSave &save);
	virtual int Restore(CRestore &restore);
	virtual int ObjectCaps() { return (CBaseEntity::ObjectCaps() & ~FCAP_ACROSS_TRANSITION) | FCAP_DIRECTIONAL_USE; }
	virtual int Classify();
	virtual void OverrideReset();
	virtual BOOL OnControls(entvars_t *pev);
	virtual void Use(CBaseEntity *pActivator, CBaseEntity *pCaller, USE_TYPE useType, float value);
	virtual void Blocked(CBaseEntity *pOther);

public:
	void EXPORT Next();
	void EXPORT Find();
	void EXPORT NearestPath();
	void EXPORT DeadEnd();

	void NextThink(float thinkTime, BOOL alwaysThink);
	void CollisionDetection();
	void TerrainFollowing();
	void CheckTurning();

	void SetTrack(CPathTrack *track) { m_ppath = track->Nearest(pev->origin); }
	void SetControls(entvars_t *pevControls);

	void StopSound();
	void UpdateSound();

public:
	static CFuncVehicle *Instance(edict_t *pent);
	static TYPEDESCRIPTION IMPL(m_SaveData)[12];

	CPathTrack *m_ppath;
	float m_length;
	float m_width;
	float m_height;
	float m_speed;
	float m_dir;
	float m_startSpeed;
	Vector m_controlMins;
	Vector m_controlMaxs;
	int m_soundPlaying;
	int m_sounds;
	int m_acceleration;
	float m_flVolume;
	float m_flBank;
	float m_oldSpeed;
	int m_iTurnAngle;
	float m_flSteeringWheelDecay;
	float m_flAcceleratorDecay;
	float m_flTurnStartTime;
	float m_flLaunchTime;
	float m_flLastNormalZ;
	float m_flCanTurnNow;
	float m_flUpdateSound;
	Vector m_vFrontLeft;
	Vector m_vFront;
	Vector m_vFrontRight;
	Vector m_vBackLeft;
	Vector m_vBack;
	Vector m_vBackRight;
	Vector m_vSurfaceNormal;
	Vector m_vVehicleDirection;
	CBaseEntity *m_pDriver;

private:
	unsigned short m_usAdjustPitch;
};