/*
Copyright (C) 1996-1997 Id Software, Inc.

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.

*/
// chase.c -- chase camera code

#include "globaldef.h"

cvar_t	*chase_back;
cvar_t	*chase_up;
cvar_t	*chase_right;
cvar_t	*chase_active;

cvar_t	*chase_yaw;
cvar_t	*chase_pitch;
cvar_t	*chase_roll;

vec3_t	chase_pos;
vec3_t	chase_angles;

vec3_t	chase_dest;
vec3_t	chase_dest_angles;


//	leilei's stupid deathcam experiment
cvar_t	*cl_diecam;	// leilei
		// 0 - regular quake tilt-the-view-suddenly death.
		// 1 - more doom-like, no tilt - camera sinks to ground and weapon is dropped. probably impossible to turn toward killer
		// 2 - quake3-like - fixed chase camera, can't move it at all. no tilt either. 
		// 3 - unrealike -  rotatable chase camera - scores are automatically displayed a few seconds later.
float	deathcamtime;	// resets to 0 if we're alive. 
float	deathcam_whenidied;	 // sets to time if died, used for timing deathcam effects...
float	deathcam_whenidiedafter; // used to time the sinks into the floor or the rankings appearing.....
vec3_t	deathcam_angles;	 // this'll update chase angles when we're dead so we don't move the
				 // player - so we can rotate the death cam in cl_diecam 3.
int	deathcam_yesiamdead;	 // pretty stupid indicator of dead.

void Chase_Init_Cvars (void)
{
	chase_back 	= Cvar_Get ("chase_back", "100", CVAR_ORIGINAL);
	chase_up 	= Cvar_Get ("chase_up", "16", CVAR_ORIGINAL);
	chase_right 	= Cvar_Get ("chase_right", "0", CVAR_ORIGINAL);
	chase_active 	= Cvar_Get ("chase_active", "0", CVAR_ORIGINAL);
	chase_yaw	= Cvar_Get ("chase_yaw", "0", CVAR_ORIGINAL);
	chase_pitch	= Cvar_Get ("chase_pitch", "0", CVAR_ORIGINAL);
	chase_roll	= Cvar_Get ("chase_roll", "0", CVAR_ORIGINAL);
	cl_diecam 	= Cvar_Get ("cl_diecam", "0", CVAR_ORIGINAL | CVAR_ARCHIVE);
}

void Chase_Reset (void)
{
	// for respawning and teleporting
//	start position 12 units behind head
}

void TraceLine (vec3_t start, vec3_t end, vec3_t impact)
{
	trace_t	trace;

	memset (&trace, 0, sizeof(trace));
	SV_RecursiveHullCheck (cl.worldmodel->hulls, 0, 0, 1, start, end, &trace);

	VectorCopy (trace.endpos, impact);
}

void Chase_Update (void)
{
	int		i;
	float	dist;
	vec3_t	forward, up, right;
	vec3_t	dest, stop;
	float	deest;
	int dontspinme;

	deest = sv.time - deathcam_whenidied;

	if(deathcam_yesiamdead == 4)
	{
		if (deest < 1)
		{
			deathcam_angles[PITCH] = 0;
			deathcam_angles[YAW] = cl.viewangles[YAW];
			deathcam_angles[ROLL] = 0;
		}
		else
		{
			deathcam_angles[PITCH] = 90;
			deathcam_angles[YAW] = 0;
		}
	}

	// if can't see player, reset
	if(deathcam_yesiamdead)
		AngleVectors (deathcam_angles, forward, right, up);
	else
		AngleVectors (cl.viewangles, forward, right, up);

	// calc exact destination
	if (deathcam_yesiamdead == 2) 	// close, nonspinnable
	{
		AngleVectors (cl.viewangles, forward, right, up);
		for (i=0 ; i<3 ; i++)
			chase_dest[i] = r_refdef.vieworg[i] - forward[i]*70 - right[i]*0;
		chase_dest[2] = r_refdef.vieworg[2];
		dontspinme = 1;
	}
	else if (deathcam_yesiamdead == 3) // spinabble...
	{
			for (i=0 ; i<3 ; i++)
				chase_dest[i] = r_refdef.vieworg[i] - forward[i]*150 - right[i]*0;
			dontspinme = 0;
	}
	else if (deathcam_yesiamdead == 4) // non spinabble... and after a duration it kinda increases....
	{
		if (deest < 1)
			deest = 0;

		dontspinme = 1;

		for (i=0 ; i<3 ; i++)
			chase_dest[i] = r_refdef.vieworg[i] - forward[i]*(55 + deest * 22) - right[i]*0;
	}
	else
	{
		for (i=0 ; i<3 ; i++)
			chase_dest[i] = r_refdef.vieworg[i] - forward[i]*chase_back->value - right[i]*chase_right->value;

		chase_dest[2] = r_refdef.vieworg[2] + chase_up->value;
		dontspinme = 1;
	}

	// find the spot the player is looking at
	VectorMA (r_refdef.vieworg, 4096, forward, dest);
	TraceLine (r_refdef.vieworg, dest, stop);

	// calculate pitch to look at the same spot from camera
	VectorSubtract (stop, r_refdef.vieworg, stop);
	dist = DotProduct (stop, forward);
	if (dist < 1)
		dist = 1;

	if (dontspinme)	// leilei - allow spin....
		r_refdef.viewangles[PITCH] = -atan(stop[2] / dist) / M_PI * 180;


	// The..... style?
	if (deathcam_yesiamdead == 1)
	{
		r_refdef.viewangles[YAW] = deathcam_angles[YAW];
		r_refdef.viewangles[PITCH] = deathcam_angles[PITCH];
		r_refdef.viewangles[ROLL] = deathcam_angles[ROLL];
	}
	// The Q3 style - fixed pitch and yaw
	else if (deathcam_yesiamdead == 2)
	{
		r_refdef.viewangles[YAW] = cl.viewangles[YAW];
		r_refdef.viewangles[PITCH] =	0;
		r_refdef.viewangles[ROLL] =		0;
	}
	// The U style
	else if (deathcam_yesiamdead == 3)
	{
		r_refdef.viewangles[YAW] = deathcam_angles[YAW];
		r_refdef.viewangles[PITCH] = deathcam_angles[PITCH];
		r_refdef.viewangles[ROLL] = deathcam_angles[ROLL];
	}
	// The DX style
	else if (deathcam_yesiamdead == 4)
	{
		if (deest < 1)
		{
			r_refdef.viewangles[YAW] = cl.viewangles[YAW];
			r_refdef.viewangles[PITCH] = 0;
			r_refdef.viewangles[ROLL] = 0;
		}
		else
		{
			r_refdef.viewangles[YAW] = 0;
			r_refdef.viewangles[PITCH] = 90;
			r_refdef.viewangles[ROLL] = deest * 18;
		}
	}

	r_refdef.viewangles[YAW] += (int)chase_yaw->value;
	r_refdef.viewangles[PITCH] += (int)chase_pitch->value;
	r_refdef.viewangles[ROLL] += (int)chase_roll->value;

	TraceLine(r_refdef.vieworg, chase_dest, stop);
	if (Length(stop) != 0)
	{
		VectorCopy(stop, chase_dest);
	}

	VectorCopy (chase_dest, r_refdef.vieworg);
}