#include "hk_weapon.qh"

#ifdef SVQC

float autocvar_g_turrets_unit_hk_shot_speed;
float autocvar_g_turrets_unit_hk_shot_speed_accel;
float autocvar_g_turrets_unit_hk_shot_speed_accel2;
float autocvar_g_turrets_unit_hk_shot_speed_decel;
float autocvar_g_turrets_unit_hk_shot_speed_max;
float autocvar_g_turrets_unit_hk_shot_speed_turnrate;

void turret_hk_missile_think(entity this);
SOUND(HunterKillerAttack_FIRE, W_Sound("rocket_fire"));
METHOD(HunterKillerAttack, wr_think, void(entity thiswep, entity actor, .entity weaponentity, int fire))
{
	bool isPlayer = IS_PLAYER(actor);
	if (fire & 1)
	if (!isPlayer || weapon_prepareattack(thiswep, actor, weaponentity, false, 1))
	{
		if (isPlayer)
		{
			turret_initparams(actor);
			W_SetupShot_Dir(actor, weaponentity, v_forward, false, 0, SND_HunterKillerAttack_FIRE, CH_WEAPON_B, 0, DEATH_TURRET_HK.m_id);
			actor.tur_shotdir_updated = w_shotdir;
			actor.tur_shotorg = w_shotorg;
			actor.tur_head = actor;
			weapon_thinkf(actor, weaponentity, WFRAME_FIRE1, 0.5, w_ready);
		}
		entity missile = turret_projectile(actor, SND_HunterKillerAttack_FIRE, 6, 10, DEATH_TURRET_HK.m_id, PROJECTILE_ROCKET, false, false);
		te_explosion(missile.origin);

		setthink(missile, turret_hk_missile_think);
		missile.nextthink = time + 0.25;
		set_movetype(missile, MOVETYPE_BOUNCEMISSILE);
		missile.velocity = actor.tur_shotdir_updated * (actor.shot_speed * 0.75);
		missile.angles = vectoangles(missile.velocity);
		missile.cnt = time + 30;
		missile.missile_flags = MIF_SPLASH | MIF_PROXY | MIF_GUIDED_AI;

		if (!isPlayer
		&& actor.tur_head.frame == 0)
			++actor.tur_head.frame;
	}
}

bool hk_is_valid_target(entity this, entity proj, entity targ);
void turret_hk_missile_think(entity this)
{
	vector vu, vd, vf, vl, vr, ve;   // Vector (direction)
	float  fu, fd, ff, fl, fr, fe;   // Fraction to solid
	vector olddir, wishdir, newdir;  // Final direction
	float lt_for;   // Length of Trace FORwrad
	float lt_seek;  // Length of Trace SEEK (left, right, up down)
	float pt_seek;  // Pitch of Trace SEEK (How mutch to angele left, right up, down trace towards v_forward)
	float myspeed;

	this.nextthink = time;

	//if (this.cnt < time)
	//	turret_hk_missile_explode();

	if (IS_DEAD(this.enemy) || IS_SPEC(this.enemy) || IS_OBSERVER(this.enemy))
		this.enemy = NULL;

	// Pick the closest valid target.
	if (!this.enemy)
	{
		// in this case, the lighter check is to validate it first, and check distance if it is valid
		IL_EACH(g_damagedbycontents, hk_is_valid_target(this.owner, this, it),
		{
			if (vdist(it.origin, >, 5000))
				continue;

			if (!this.enemy)
				this.enemy = it;
			else if (vlen2(this.origin - it.origin) < vlen2(this.origin - this.enemy.origin))
				this.enemy = it;
		});
	}

	this.angles = vectoangles(this.velocity);
	this.angles.x = -this.angles.x;
	makevectors(this.angles);
	this.angles.x = -this.angles.x;

	if (this.enemy)
	{
		// Close enougth to do decent damage?
		if (vdist(this.origin - this.enemy.origin, <=, (this.owner.shot_radius * 0.25)))
		{
			turret_projectile_explode(this);
			return;
		}

		// Get data on enemy position
		vector pre_pos = this.enemy.origin
			+ this.enemy.velocity * min(vlen(this.enemy.origin - this.origin) / vlen(this.velocity), 0.5);

		traceline(this.origin, pre_pos, true, this.enemy);
		ve = normalize(pre_pos - this.origin);
		fe = trace_fraction;
	}
	else
	{
		ve = '0 0 0';
		fe = 0;
	}

	if (fe != 1 || this.enemy == NULL || vdist(this.origin - this.enemy.origin, >, 1000))
	{
		myspeed = vlen(this.velocity);

		lt_for  = myspeed * 3;
		lt_seek = myspeed * 2.95;

		// Trace forward
		traceline(this.origin, this.origin + v_forward * lt_for, false, this);
		vf = trace_endpos;
		ff = trace_fraction;

		// Find angular offset
		float ad = vlen(vectoangles(normalize(this.enemy.origin - this.origin)) - this.angles);

		// To close to something, Slow down!
		if ((ff < 0.7 || ad > 4)
		&&  myspeed > autocvar_g_turrets_unit_hk_shot_speed)
			myspeed = max(myspeed * autocvar_g_turrets_unit_hk_shot_speed_decel, autocvar_g_turrets_unit_hk_shot_speed);

		// Failry clear, accelerate.
		if (ff > 0.7
		&&  myspeed < autocvar_g_turrets_unit_hk_shot_speed_max)
			myspeed = min(myspeed * autocvar_g_turrets_unit_hk_shot_speed_accel, autocvar_g_turrets_unit_hk_shot_speed_max);

		// Setup trace pitch
		pt_seek = bound(0.15, 1 - ff, 0.8);
		if (ff < 0.5)
			pt_seek = 1;

		// Trace left
		traceline(this.origin, this.origin + (-(v_right * pt_seek) + (v_forward * ff)) * lt_seek, false, this);
		vl = trace_endpos;
		fl = trace_fraction;

		// Trace right
		traceline(this.origin, this.origin + ((v_right * pt_seek) + (v_forward * ff)) * lt_seek, false, this);
		vr = trace_endpos;
		fr = trace_fraction;

		// Trace up
		traceline(this.origin, this.origin + ((v_up * pt_seek) + (v_forward * ff)) * lt_seek, false, this);
		vu = trace_endpos;
		fu = trace_fraction;

		// Trace down
		traceline(this.origin, this.origin + (-(v_up * pt_seek) + (v_forward * ff)) * lt_seek, false, this);
		vd = trace_endpos;
		fd = trace_fraction;

		vl = normalize(vl - this.origin);
		vr = normalize(vr - this.origin);
		vu = normalize(vu - this.origin);
		vd = normalize(vd - this.origin);

		// Panic tresh passed, find a single direction and turn as hard as we can
		if (pt_seek == 1)
		{
			wishdir = v_right;
			if (fl > fr)  wishdir = -v_right;
			if (fu > fl)  wishdir = v_up;
			if (fd > fu)  wishdir = -v_up;
		}
		else
		{
			// Normalize our trace vectors to make a smooth path
			wishdir = normalize((vl * fl) + (vr * fr) + (vu * fu) + (vd * fd));
		}

		if (this.enemy)
		{
			if (fe < 0.1)
				fe = 0.1; // Make sure we always try to move sligtly towards our target
			wishdir = wishdir * (1 - fe) + (ve * fe);
		}
	}
	else
	{
		// Got a clear path to target, speed up fast (if not at full speed) and go straight for it.
		myspeed = vlen(this.velocity);
		if (myspeed < autocvar_g_turrets_unit_hk_shot_speed_max)
			myspeed = min(myspeed * autocvar_g_turrets_unit_hk_shot_speed_accel2, autocvar_g_turrets_unit_hk_shot_speed_max);

		wishdir = ve;
	}

	if (myspeed > autocvar_g_turrets_unit_hk_shot_speed && this.cnt > time)
		myspeed = min(myspeed * autocvar_g_turrets_unit_hk_shot_speed_accel2, autocvar_g_turrets_unit_hk_shot_speed_max);

	// Ranoutagazfish?
	if (this.cnt < time)
	{
		this.cnt = time + 0.25;
		this.nextthink = 0;
		set_movetype(this, MOVETYPE_BOUNCE);
		return;
	}

	// Calculate new heading
	olddir = normalize(this.velocity);
	newdir = normalize(olddir + wishdir * autocvar_g_turrets_unit_hk_shot_speed_turnrate);

	// Set heading & speed
	this.velocity = newdir * myspeed;

	// Align model with new heading
	this.angles = vectoangles(this.velocity);


#ifdef TURRET_DEBUG_HK
	//if (this.atime < time) {
	if (fe <= 0.99 || vdist(this.origin - this.enemy.origin, >, 1000))
	{
		te_lightning2(NULL, this.origin, this.origin + vr * lt_seek);
		te_lightning2(NULL, this.origin, this.origin + vl * lt_seek);
		te_lightning2(NULL, this.origin, this.origin + vu * lt_seek);
		te_lightning2(NULL, this.origin, this.origin + vd * lt_seek);
		te_lightning2(NULL, this.origin, vf);
	}
	else
		te_lightning2(NULL, this.origin, this.enemy.origin);

	bprint("Speed: ", ftos(rint(myspeed)), "\n");
	bprint("Trace to solid: ", ftos(rint(ff * 100)), "%\n");
	bprint("Trace to target:", ftos(rint(fe * 100)), "%\n");
	this.atime = time + 0.2;
	//}
#endif

	UpdateCSQCProjectile(this);
}

bool hk_is_valid_target(entity this, entity proj, entity targ)
{
	if (!targ)
		return false;
	if (is_pure(targ)) // we know for sure pure entities are bad targets
		return false;
	if (targ.flags & FL_NOTARGET) // If only this was used more..
		return false;

	if (targ.takedamage == DAMAGE_NO || GetResource(targ, RES_HEALTH) < 0) // Cant touch this
		return false;

	if (IS_PLAYER(targ)) // player
	{
		if (this.target_select_playerbias < 0)
			return false;

		if (IS_DEAD(targ))
			return false;
	}

	if ((targ.flags & FL_PROJECTILE) && this.target_select_missilebias < 0) // Missile
		return false;

	if (SAME_TEAM(targ, this) || SAME_TEAM(this, targ.owner)) // Team check
		return false;

	return true;
}

#endif // SVQC