/*
Copyright (C) 1997-2001 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.

*/

#include "g_local.h"
#include "m_player.h"



static	edict_t		*current_player;
static	gclient_t	*current_client;

static	vec3_t	forward, right, up;
float	xyspeed;

float	bobmove;
int		bobcycle;		// odd cycles are right foot going forward
float	bobfracsin;		// sin(bobfrac*M_PI)

/*
===============
SV_CalcRoll

===============
*/
float SV_CalcRoll (vec3_t angles, vec3_t velocity)
{
	float	sign;
	float	side;
	float	value;
	
	side = DotProduct (velocity, right);
	sign = side < 0 ? -1 : 1;
	side = fabs(side);
	
	value = sv_rollangle->value;

	if (side < sv_rollspeed->value)
		side = side * value / sv_rollspeed->value;
	else
		side = value;
	
	return side*sign;
	
}


/*
===============
P_DamageFeedback

Handles color blends and view kicks
===============
*/
void P_DamageFeedback (edict_t *player)
{
	gclient_t	*client;
	float	side;
	float	realcount, count, kick;
	vec3_t	v;
	int		r, l;
	static	vec3_t	power_color = {0.0, 1.0, 0.0};
	static	vec3_t	acolor = {1.0, 1.0, 1.0};
	static	vec3_t	bcolor = {1.0, 0.0, 0.0};

	client = player->client;

	// flash the backgrounds behind the status numbers
	client->ps.stats[STAT_FLASHES] = 0;
	if (client->damage_blood)
		client->ps.stats[STAT_FLASHES] |= 1;
	if (client->damage_armor && !(player->flags & FL_GODMODE) && (client->invincible_framenum <= level.framenum))
		client->ps.stats[STAT_FLASHES] |= 2;

	// total points of damage shot at the player this frame
	count = (client->damage_blood + client->damage_armor + client->damage_parmor);
	if (count == 0)
		return;		// didn't take any damage

	// start a pain animation if still in the player model
	if (client->anim_priority < ANIM_PAIN && player->s.modelindex == 255)
	{
		static int		i;

		client->anim_priority = ANIM_PAIN;
		if (client->ps.pmove.pm_flags & PMF_DUCKED)
		{
			player->s.frame = FRAME_crpain1-1;
			client->anim_end = FRAME_crpain4;
		}
		else
		{
			i = (i+1)%3;
			switch (i)
			{
			case 0:
				player->s.frame = FRAME_pain101-1;
				client->anim_end = FRAME_pain104;
				break;
			case 1:
				player->s.frame = FRAME_pain201-1;
				client->anim_end = FRAME_pain204;
				break;
			case 2:
				player->s.frame = FRAME_pain301-1;
				client->anim_end = FRAME_pain304;
				break;
			}
		}
	}

	realcount = count;
	if (count < 10)
		count = 10;	// always make a visible effect

	// play an apropriate pain sound
	if ((level.time > player->pain_debounce_time) && !(player->flags & FL_GODMODE) && (client->invincible_framenum <= level.framenum))
	{
		r = 1 + (rand()&1);
		player->pain_debounce_time = level.time + 0.7;
		if (player->health < 25)
			l = 25;
		else if (player->health < 50)
			l = 50;
		else if (player->health < 75)
			l = 75;
		else
			l = 100;
		gi.sound (player, CHAN_VOICE, gi.soundindex(va("*pain%i_%i.wav", l, r)), 1, ATTN_NORM, 0);
	}

	// the total alpha of the blend is always proportional to count
	if (client->damage_alpha < 0)
		client->damage_alpha = 0;
	client->damage_alpha += count*0.01;
	if (client->damage_alpha < 0.2)
		client->damage_alpha = 0.2;
	if (client->damage_alpha > 0.6)
		client->damage_alpha = 0.6;		// don't go too saturated

	// the color of the blend will vary based on how much was absorbed
	// by different armors
	VectorClear (v);
	if (client->damage_parmor)
		VectorMA (v, (float)client->damage_parmor/realcount, power_color, v);
	if (client->damage_armor)
		VectorMA (v, (float)client->damage_armor/realcount,  acolor, v);
	if (client->damage_blood)
		VectorMA (v, (float)client->damage_blood/realcount,  bcolor, v);
	VectorCopy (v, client->damage_blend);


	//
	// calculate view angle kicks
	//
	kick = abs(client->damage_knockback);
	if (kick && player->health > 0)	// kick of 0 means no view adjust at all
	{
		kick = kick * 100 / player->health;

		if (kick < count*0.5)
			kick = count*0.5;
		if (kick > 50)
			kick = 50;

		VectorSubtract (client->damage_from, player->s.origin, v);
		VectorNormalize (v);
		
		side = DotProduct (v, right);
		client->v_dmg_roll = kick*side*0.3;
		
		side = -DotProduct (v, forward);
		client->v_dmg_pitch = kick*side*0.3;

		client->v_dmg_time = level.time + DAMAGE_TIME;
	}

	//
	// clear totals
	//
	client->damage_blood = 0;
	client->damage_armor = 0;
	client->damage_parmor = 0;
	client->damage_knockback = 0;
}




/*
===============
SV_CalcViewOffset

Auto pitching on slopes?

  fall from 128: 400 = 160000
  fall from 256: 580 = 336400
  fall from 384: 720 = 518400
  fall from 512: 800 = 640000
  fall from 640: 960 = 

  damage = deltavelocity*deltavelocity  * 0.0001

===============
*/
void SV_CalcViewOffset (edict_t *ent)
{
	float		*angles;
	float		bob;
	float		ratio;
	float		delta;
	vec3_t		v;


//===================================

	// base angles
	angles = ent->client->ps.kick_angles;

	// if dead, fix the angle and don't add any kick
	if (ent->deadflag)
	{
		VectorClear (angles);

		ent->client->ps.viewangles[ROLL] = 40;
		ent->client->ps.viewangles[PITCH] = -15;
		ent->client->ps.viewangles[YAW] = ent->client->killer_yaw;
	}
	else
	{
		// add angles based on weapon kick

		VectorCopy (ent->client->kick_angles, angles);

		// add angles based on damage kick

		ratio = (ent->client->v_dmg_time - level.time) / DAMAGE_TIME;
		if (ratio < 0)
		{
			ratio = 0;
			ent->client->v_dmg_pitch = 0;
			ent->client->v_dmg_roll = 0;
		}
		angles[PITCH] += ratio * ent->client->v_dmg_pitch;
		angles[ROLL] += ratio * ent->client->v_dmg_roll;

		// add pitch based on fall kick

		ratio = (ent->client->fall_time - level.time) / FALL_TIME;
		if (ratio < 0)
			ratio = 0;
		angles[PITCH] += ratio * ent->client->fall_value;

		// add angles based on velocity

		delta = DotProduct (ent->velocity, forward);
		angles[PITCH] += delta*run_pitch->value;
		
		delta = DotProduct (ent->velocity, right);
		angles[ROLL] += delta*run_roll->value;

		// add angles based on bob

		delta = bobfracsin * bob_pitch->value * xyspeed;
		if (ent->client->ps.pmove.pm_flags & PMF_DUCKED)
			delta *= 6;		// crouching
		angles[PITCH] += delta;
		delta = bobfracsin * bob_roll->value * xyspeed;
		if (ent->client->ps.pmove.pm_flags & PMF_DUCKED)
			delta *= 6;		// crouching
		if (bobcycle & 1)
			delta = -delta;
		angles[ROLL] += delta;
	}

//===================================

	// base origin

	VectorClear (v);

	// add view height

	v[2] += ent->viewheight;

	// add fall height

	ratio = (ent->client->fall_time - level.time) / FALL_TIME;
	if (ratio < 0)
		ratio = 0;
	v[2] -= ratio * ent->client->fall_value * 0.4;

	// add bob height

	bob = bobfracsin * xyspeed * bob_up->value;
	if (bob > 6)
		bob = 6;
	//gi.DebugGraph (bob *2, 255);
	v[2] += bob;

	// add kick offset

	VectorAdd (v, ent->client->kick_origin, v);

	// absolutely bound offsets
	// so the view can never be outside the player box

	if (v[0] < -14)
		v[0] = -14;
	else if (v[0] > 14)
		v[0] = 14;
	if (v[1] < -14)
		v[1] = -14;
	else if (v[1] > 14)
		v[1] = 14;
	if (v[2] < -22)
		v[2] = -22;
	else if (v[2] > 30)
		v[2] = 30;

	VectorCopy (v, ent->client->ps.viewoffset);
}

/*
==============
SV_CalcGunOffset
==============
*/
void SV_CalcGunOffset (edict_t *ent)
{
	int		i;
	float	delta;

	// gun angles from bobbing
	ent->client->ps.gunangles[ROLL] = xyspeed * bobfracsin * 0.005;
	ent->client->ps.gunangles[YAW] = xyspeed * bobfracsin * 0.01;
	if (bobcycle & 1)
	{
		ent->client->ps.gunangles[ROLL] = -ent->client->ps.gunangles[ROLL];
		ent->client->ps.gunangles[YAW] = -ent->client->ps.gunangles[YAW];
	}

	ent->client->ps.gunangles[PITCH] = xyspeed * bobfracsin * 0.005;

	// gun angles from delta movement
	for (i=0 ; i<3 ; i++)
	{
		delta = ent->client->oldviewangles[i] - ent->client->ps.viewangles[i];
		if (delta > 180)
			delta -= 360;
		if (delta < -180)
			delta += 360;
		if (delta > 45)
			delta = 45;
		if (delta < -45)
			delta = -45;
		if (i == YAW)
			ent->client->ps.gunangles[ROLL] += 0.1*delta;
		ent->client->ps.gunangles[i] += 0.2 * delta;
	}

	// gun height
	VectorClear (ent->client->ps.gunoffset);
//	ent->ps->gunorigin[2] += bob;

	// gun_x / gun_y / gun_z are development tools
	for (i=0 ; i<3 ; i++)
	{
		ent->client->ps.gunoffset[i] += forward[i]*(gun_y->value);
		ent->client->ps.gunoffset[i] += right[i]*gun_x->value;
		ent->client->ps.gunoffset[i] += up[i]* (-gun_z->value);
	}
}


/*
=============
SV_AddBlend
=============
*/
void SV_AddBlend (float r, float g, float b, float a, float *v_blend)
{
	float	a2, a3;

	if (a <= 0)
		return;
	a2 = v_blend[3] + (1-v_blend[3])*a;	// new total alpha
	a3 = v_blend[3]/a2;		// fraction of color from old

	v_blend[0] = v_blend[0]*a3 + r*(1-a3);
	v_blend[1] = v_blend[1]*a3 + g*(1-a3);
	v_blend[2] = v_blend[2]*a3 + b*(1-a3);
	v_blend[3] = a2;
}


/*
=============
SV_CalcBlend
=============
*/
void SV_CalcBlend (edict_t *ent)
{
	int		contents;
	vec3_t	vieworg;
	int		remaining;

	ent->client->ps.blend[0] = ent->client->ps.blend[1] = 
		ent->client->ps.blend[2] = ent->client->ps.blend[3] = 0;

	// add for contents
	VectorAdd (ent->s.origin, ent->client->ps.viewoffset, vieworg);
	contents = gi.pointcontents (vieworg);
	if (contents & (CONTENTS_LAVA|CONTENTS_SLIME|CONTENTS_WATER) )
		ent->client->ps.rdflags |= RDF_UNDERWATER;
	else
		ent->client->ps.rdflags &= ~RDF_UNDERWATER;

	if (contents & (CONTENTS_SOLID|CONTENTS_LAVA))
		SV_AddBlend (1.0, 0.3, 0.0, 0.6, ent->client->ps.blend);
	else if (contents & CONTENTS_SLIME)
		SV_AddBlend (0.0, 0.1, 0.05, 0.6, ent->client->ps.blend);
	else if (contents & CONTENTS_WATER)
		SV_AddBlend (0.5, 0.3, 0.2, 0.4, ent->client->ps.blend);

	// add for powerups
	if (ent->client->quad_framenum > level.framenum)
	{
		remaining = ent->client->quad_framenum - level.framenum;
		if (remaining == 30)	// beginning to fade
			gi.sound(ent, CHAN_ITEM, gi.soundindex("items/damage2.wav"), 1, ATTN_NORM, 0);
		if (remaining > 30 || (remaining & 4) )
			SV_AddBlend (0, 0, 1, 0.08, ent->client->ps.blend);
	}
	else if (ent->client->invincible_framenum > level.framenum)
	{
		remaining = ent->client->invincible_framenum - level.framenum;
		if (remaining == 30)	// beginning to fade
			gi.sound(ent, CHAN_ITEM, gi.soundindex("items/protect2.wav"), 1, ATTN_NORM, 0);
		if (remaining > 30 || (remaining & 4) )
			SV_AddBlend (1, 1, 0, 0.08, ent->client->ps.blend);
	}
	else if (ent->client->enviro_framenum > level.framenum)
	{
		remaining = ent->client->enviro_framenum - level.framenum;
		if (remaining == 30)	// beginning to fade
			gi.sound(ent, CHAN_ITEM, gi.soundindex("items/airout.wav"), 1, ATTN_NORM, 0);
		if (remaining > 30 || (remaining & 4) )
			SV_AddBlend (0, 1, 0, 0.08, ent->client->ps.blend);
	}
	else if (ent->client->breather_framenum > level.framenum)
	{
		remaining = ent->client->breather_framenum - level.framenum;
		if (remaining == 30)	// beginning to fade
			gi.sound(ent, CHAN_ITEM, gi.soundindex("items/airout.wav"), 1, ATTN_NORM, 0);
		if (remaining > 30 || (remaining & 4) )
			SV_AddBlend (0.4, 1, 0.4, 0.04, ent->client->ps.blend);
	}

	// add for damage
	if (ent->client->damage_alpha > 0)
		SV_AddBlend (ent->client->damage_blend[0],ent->client->damage_blend[1]
		,ent->client->damage_blend[2], ent->client->damage_alpha, ent->client->ps.blend);

	if (ent->client->bonus_alpha > 0)
		SV_AddBlend (0.85, 0.7, 0.3, ent->client->bonus_alpha, ent->client->ps.blend);

	// drop the damage value
	ent->client->damage_alpha -= 0.06;
	if (ent->client->damage_alpha < 0)
		ent->client->damage_alpha = 0;

	// drop the bonus value
	ent->client->bonus_alpha -= 0.1;
	if (ent->client->bonus_alpha < 0)
		ent->client->bonus_alpha = 0;
}


/*
=================
P_FallingDamage
=================
*/
void P_FallingDamage (edict_t *ent)
{
	float	delta;
	int		damage;
	vec3_t	dir;

	if (ent->s.modelindex != 255)
		return;		// not in the player model

	if (ent->movetype == MOVETYPE_NOCLIP)
		return;

	if ((ent->client->oldvelocity[2] < 0) && (ent->velocity[2] > ent->client->oldvelocity[2]) && (!ent->groundentity))
	{
		delta = ent->client->oldvelocity[2];
	}
	else
	{
		if (!ent->groundentity)
			return;
		delta = ent->velocity[2] - ent->client->oldvelocity[2];
	}
	delta = delta*delta * 0.0001;

	// never take falling damage if completely underwater
	if (ent->waterlevel == 3)
		return;
	if (ent->waterlevel == 2)
		delta *= 0.25;
	if (ent->waterlevel == 1)
		delta *= 0.5;

	if (delta < 1)
		return;

	if (delta < 15)
	{
		ent->s.event = EV_FOOTSTEP;
		return;
	}

	ent->client->fall_value = delta*0.5;
	if (ent->client->fall_value > 40)
		ent->client->fall_value = 40;