// Copyright (c) ZeniMax Media Inc.
// Licensed under the GNU General Public License 2.0.
/*
==============================================================================

parasite

==============================================================================
*/

#include "g_local.h"
#include "m_parasite.h"

constexpr float g_athena_parasite_miss_chance = 0.1f;
constexpr float g_athena_parasite_proboscis_speed = 1250;
constexpr float g_athena_parasite_proboscis_retract_modifier = 2.0f;

static cached_soundindex sound_pain1;
static cached_soundindex sound_pain2;
static cached_soundindex sound_die;
static cached_soundindex sound_launch;
static cached_soundindex sound_impact;
static cached_soundindex sound_suck;
static cached_soundindex sound_reelin;
static cached_soundindex sound_sight;
static cached_soundindex sound_tap;
static cached_soundindex sound_scratch;
static cached_soundindex sound_search;

void parasite_stand(edict_t *self);
void parasite_start_run(edict_t *self);
void parasite_run(edict_t *self);
void parasite_walk(edict_t *self);
void parasite_end_fidget(edict_t *self);
void parasite_do_fidget(edict_t *self);
void parasite_refidget(edict_t *self);

void parasite_launch(edict_t *self)
{
	gi.sound(self, CHAN_WEAPON, sound_launch, 1, ATTN_NORM, 0);
}

void parasite_reel_in(edict_t *self)
{
	gi.sound(self, CHAN_WEAPON, sound_reelin, 1, ATTN_NORM, 0);
}

MONSTERINFO_SIGHT(parasite_sight) (edict_t *self, edict_t *other) -> void
{
	gi.sound(self, CHAN_WEAPON, sound_sight, 1, ATTN_NORM, 0);
}

void parasite_tap(edict_t *self)
{
	gi.sound(self, CHAN_WEAPON, sound_tap, 0.75f, 2.75f, 0);
}

void parasite_scratch(edict_t *self)
{
	gi.sound(self, CHAN_WEAPON, sound_scratch, 0.75f, 2.75f, 0);
}

#if 0
void parasite_search(edict_t *self)
{
	gi.sound(self, CHAN_WEAPON, sound_search, 1, ATTN_IDLE, 0);
}
#endif

mframe_t parasite_frames_start_fidget[] = {
	{ ai_stand },
	{ ai_stand },
	{ ai_stand },
	{ ai_stand }
};
MMOVE_T(parasite_move_start_fidget) = { FRAME_stand18, FRAME_stand21, parasite_frames_start_fidget, parasite_do_fidget };

mframe_t parasite_frames_fidget[] = {
	{ ai_stand, 0, parasite_scratch },
	{ ai_stand },
	{ ai_stand },
	{ ai_stand, 0, parasite_scratch },
	{ ai_stand },
	{ ai_stand }
};
MMOVE_T(parasite_move_fidget) = { FRAME_stand22, FRAME_stand27, parasite_frames_fidget, parasite_refidget };

mframe_t parasite_frames_end_fidget[] = {
	{ ai_stand, 0, parasite_scratch },
	{ ai_stand },
	{ ai_stand },
	{ ai_stand },
	{ ai_stand },
	{ ai_stand },
	{ ai_stand },
	{ ai_stand }
};
MMOVE_T(parasite_move_end_fidget) = { FRAME_stand28, FRAME_stand35, parasite_frames_end_fidget, parasite_stand };

void parasite_end_fidget(edict_t *self)
{
	M_SetAnimation(self, &parasite_move_end_fidget);
}

void parasite_do_fidget(edict_t *self)
{
	M_SetAnimation(self, &parasite_move_fidget);
}

void parasite_refidget(edict_t *self)
{
	if (frandom() <= 0.8f)
		M_SetAnimation(self, &parasite_move_fidget);
	else
		M_SetAnimation(self, &parasite_move_end_fidget);
}

MONSTERINFO_IDLE(parasite_idle) (edict_t *self) -> void
{
	if (self->enemy)
		return;

	M_SetAnimation(self, &parasite_move_start_fidget);
}

mframe_t parasite_frames_stand[] = {
	{ ai_stand },
	{ ai_stand },
	{ ai_stand, 0, parasite_tap },
	{ ai_stand },
	{ ai_stand, 0, parasite_tap },
	{ ai_stand },
	{ ai_stand },
	{ ai_stand },
	{ ai_stand, 0, parasite_tap },
	{ ai_stand },
	{ ai_stand, 0, parasite_tap },
	{ ai_stand },
	{ ai_stand },
	{ ai_stand },
	{ ai_stand, 0, parasite_tap },
	{ ai_stand },
	{ ai_stand, 0, parasite_tap }
};
MMOVE_T(parasite_move_stand) = { FRAME_stand01, FRAME_stand17, parasite_frames_stand, parasite_stand };

MONSTERINFO_STAND(parasite_stand) (edict_t *self) -> void
{
	M_SetAnimation(self, &parasite_move_stand);
}

mframe_t parasite_frames_run[] = {
	{ ai_run, 30 },
	{ ai_run, 30 },
	{ ai_run, 22, monster_footstep },
	{ ai_run, 19, monster_footstep },
	{ ai_run, 24 },
	{ ai_run, 28, monster_footstep },
	{ ai_run, 25, monster_footstep }
};
MMOVE_T(parasite_move_run) = { FRAME_run03, FRAME_run09, parasite_frames_run, nullptr };

mframe_t parasite_frames_start_run[] = {
	{ ai_run },
	{ ai_run, 30 },
};
MMOVE_T(parasite_move_start_run) = { FRAME_run01, FRAME_run02, parasite_frames_start_run, parasite_run };

#if 0
mframe_t parasite_frames_stop_run[] = {
	{ ai_run, 20 },
	{ ai_run, 20 },
	{ ai_run, 12 },
	{ ai_run, 10 },
	{ ai_run },
	{ ai_run }
};
MMOVE_T(parasite_move_stop_run) = { FRAME_run10, FRAME_run15, parasite_frames_stop_run, nullptr };
#endif

MONSTERINFO_RUN(parasite_start_run) (edict_t *self) -> void
{
	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
		M_SetAnimation(self, &parasite_move_stand);
	else
		M_SetAnimation(self, &parasite_move_start_run);
}

static void proboscis_retract(edict_t *self);

void parasite_run(edict_t *self)
{
	if (self->proboscus && self->proboscus->style != 2)
		proboscis_retract(self->proboscus);

	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
		M_SetAnimation(self, &parasite_move_stand);
	else
		M_SetAnimation(self, &parasite_move_run);
}

mframe_t parasite_frames_walk[] = {
	{ ai_walk, 30 },
	{ ai_walk, 30 },
	{ ai_walk, 22, monster_footstep },
	{ ai_walk, 19, monster_footstep },
	{ ai_walk, 24 },
	{ ai_walk, 28, monster_footstep },
	{ ai_walk, 25, monster_footstep }
};
MMOVE_T(parasite_move_walk) = { FRAME_run03, FRAME_run09, parasite_frames_walk, parasite_walk };

mframe_t parasite_frames_start_walk[] = {
	{ ai_walk, 0 },
	{ ai_walk, 30, parasite_walk }
};
MMOVE_T(parasite_move_start_walk) = { FRAME_run01, FRAME_run02, parasite_frames_start_walk, nullptr };

#if 0
mframe_t parasite_frames_stop_walk[] = {
	{ ai_walk, 20 },
	{ ai_walk, 20 },
	{ ai_walk, 12 },
	{ ai_walk, 10 },
	{ ai_walk },
	{ ai_walk }
};
MMOVE_T(parasite_move_stop_walk) = { FRAME_run10, FRAME_run15, parasite_frames_stop_walk, nullptr };
#endif

MONSTERINFO_WALK(parasite_start_walk) (edict_t *self) -> void
{
	M_SetAnimation(self, &parasite_move_start_walk);
}

void parasite_walk(edict_t *self)
{
	M_SetAnimation(self, &parasite_move_walk);
}

// hard reset on proboscis; like we never existed
THINK(proboscis_reset) (edict_t *self) -> void
{
	self->owner->proboscus = nullptr;
	G_FreeEdict(self->proboscus);
	G_FreeEdict(self);
}

DIE(proboscis_die) (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, const vec3_t &point, const mod_t &mod) -> void
{
	if (mod.id == MOD_CRUSH)
		proboscis_reset(self);
}

extern const mmove_t parasite_move_fire_proboscis;

static void parasite_break_wait(edict_t *self)
{
	// prob exploded?
	if (self->proboscus && self->proboscus->style != 3)
		self->monsterinfo.nextframe = FRAME_break19;
	else if (brandom())
	{
		// don't get hurt
		parasite_reel_in(self);
		self->monsterinfo.nextframe = FRAME_break31;
	}
}

static void proboscis_retract(edict_t *self)
{
	// start retract animation
	if (self->owner->monsterinfo.active_move == &parasite_move_fire_proboscis)
		self->owner->monsterinfo.nextframe = FRAME_drain12;

	// mark as retracting
	self->movetype = MOVETYPE_NONE;
	self->solid = SOLID_NOT;
	// come back real hard
	if (self->style != 2)
		self->speed *= g_athena_parasite_proboscis_retract_modifier;
	self->style = 2;
	gi.linkentity(self);
}

static void parasite_break_retract(edict_t *self)
{
	if (self->proboscus)
		proboscis_retract(self->proboscus);
}

static void parasite_break_sound(edict_t *self)
{
	if (frandom() < 0.5f)
		gi.sound(self, CHAN_VOICE, sound_pain1, 1, ATTN_NORM, 0);
	else
		gi.sound(self, CHAN_VOICE, sound_pain2, 1, ATTN_NORM, 0);

	self->pain_debounce_time = level.time + 3_sec;
}

void proboscis_segment_draw(edict_t *self);

static void parasite_charge_proboscis(edict_t *self, float dist)
{
	if (self->s.frame >= FRAME_break01 && self->s.frame <= FRAME_break32)
		ai_move(self, dist);
	else
		ai_charge(self, dist);

	if (self->proboscus)
		proboscis_segment_draw(self->proboscus->proboscus);
}

static void parasite_break_noise(edict_t *self)
{
	gi.sound(self, CHAN_VOICE, sound_search, 1, ATTN_NORM, 0);
}

constexpr mframe_t parasite_frames_break[] = {
	{ parasite_charge_proboscis },
	{ parasite_charge_proboscis, -3, parasite_break_noise },
	{ parasite_charge_proboscis, 1 },
	{ parasite_charge_proboscis, 2 },
	{ parasite_charge_proboscis, -3 },
	{ parasite_charge_proboscis, 1 },
	{ parasite_charge_proboscis, 1 },
	{ parasite_charge_proboscis, 3 },
	{ parasite_charge_proboscis, 0, parasite_break_noise },
	{ parasite_charge_proboscis, -18 },
	{ parasite_charge_proboscis, 3 },
	{ parasite_charge_proboscis, 9 },
	{ parasite_charge_proboscis, 6 },
	{ parasite_charge_proboscis },
	{ parasite_charge_proboscis, -18 },
	{ parasite_charge_proboscis },
	{ parasite_charge_proboscis, 8, parasite_break_retract },
	{ parasite_charge_proboscis, 9 },
	{ parasite_charge_proboscis, 0, parasite_break_wait },
	{ parasite_charge_proboscis, -18, parasite_break_sound },
	{ parasite_charge_proboscis },
	{ parasite_charge_proboscis }, // airborne
	{ parasite_charge_proboscis }, // airborne
	{ parasite_charge_proboscis }, // slides
	{ parasite_charge_proboscis }, // slides
	{ parasite_charge_proboscis }, // slides
	{ parasite_charge_proboscis }, // slides
	{ parasite_charge_proboscis, 4 },
	{ parasite_charge_proboscis, 11 },
	{ parasite_charge_proboscis, -2 },
	{ parasite_charge_proboscis, -5 },
	{ parasite_charge_proboscis, 1 }
};
MMOVE_T(parasite_move_break) = { FRAME_break01, FRAME_break32, parasite_frames_break, parasite_start_run };

TOUCH(proboscis_touch) (edict_t *self, edict_t *other, const trace_t &tr, bool other_touching_self) -> void
{
	// owner isn't trying to probe any more, don't touch anything
	if (self->owner->monsterinfo.active_move != &parasite_move_fire_proboscis)
		return;

	vec3_t p;

	// hit what we want to succ
	if ((other->svflags & SVF_PLAYER) || other == self->owner->enemy)
	{
		if (tr.startsolid)
			p = tr.endpos;
		else
			p = tr.endpos - ((self->s.origin - tr.endpos).normalized() * 12);

		self->owner->monsterinfo.nextframe = FRAME_drain06;
		self->movetype = MOVETYPE_NONE;
		self->solid = SOLID_NOT;
		self->style = 1;
		// stick to this guy
		self->move_origin = p - other->s.origin;
		self->enemy = other;
		self->s.alpha = 0.35f;
		gi.sound(self, CHAN_WEAPON, sound_suck, 1, ATTN_NORM, 0);
	}
	else
	{
		p = tr.endpos + tr.plane.normal;
		// hit monster, don't suck but do small damage
		// and retract immediately
		if (other->svflags & (SVF_MONSTER | SVF_DEADMONSTER))
			proboscis_retract(self);
		else
		{
			// hit wall; stick to it and do break animation
			self->owner->monsterinfo.active_move = &parasite_move_break;
			self->movetype = MOVETYPE_NONE;
			self->solid = SOLID_NOT;
			self->style = 1;
			self->owner->s.angles[YAW] = self->s.angles[YAW];
		}
	}

	if (other->takedamage)
		T_Damage(other, self, self->owner, tr.plane.normal, tr.endpos, tr.plane.normal, 5, 0, DAMAGE_NONE, MOD_UNKNOWN);

	gi.positioned_sound(tr.endpos, self->owner, CHAN_AUTO, sound_impact, 1, ATTN_NORM, 0);

	self->s.origin = p;
	self->nextthink = level.time + FRAME_TIME_S; // start doing stuff on next frame
	gi.linkentity(self);
}

// from break01
constexpr vec3_t parasite_break_offsets[] = {
	{ 7.0f, 0, 7.0f },
	{ 6.3f, 14.5f, 4.0f },
	{ 8.5f, 0, 5.6f },
	{ 5.0f, -15.25f, 4.0f, },
	{ 9.5f, -1.8f, 5.9f },
	{ 6.2f, 14.f, 4.0f },
	{ 12.25f, 7.5f, 1.4f },
	{ 13.8f, 0, -2.4f },
	{ 13.8f, 0, -4.0f },
	{ 0.1f, 0, -0.7f },
	{ 5.0f, 0, 3.7f },
	{ 11.f, 0, 4.f },
	{ 13.5f, 0, -4.0f },
	{ 13.5f, 0, -4.0f },
	{ 0.2f, 0, -0.7f },
	{ 3.9f, 0, 3.6f },
	{ 8.5f, 0, 5.0f },
	{ 14.0f, 0, -4.f },
	{ 14.0f, 0, -4.f },
	{ 0.1f, 0, -0.5f }
};

// from drain01
constexpr vec3_t parasite_drain_offsets[] = {
	{ -1.7f, 0, 1.2f },
	{ -2.2f, 0, -0.6f },
	{ 7.7f, 0, 7.2f },
	{ 7.2f, 0, 5.7f },
	{ 6.2f, 0, 7.8f },
	{ 4.7f, 0, 6.7f },
	{ 5.0f, 0, 9.0f },
	{ 5.0f, 0, 7.0f },
	{ 5.0f, 0, 10.5f },
	{ 4.5f, 0, 9.7f },
	{ 1.5f, 0, 12.0f },
	{ 2.9f, 0, 11.0f },
	{ 2.1f, 0, 7.6f },
};

vec3_t parasite_get_proboscis_start(edict_t *self)
{
	vec3_t f, r, start;
	AngleVectors(self->s.angles, f, r, nullptr);
	vec3_t offset;
	if (self->s.frame >= FRAME_break01 && self->s.frame < FRAME_break01 + q_countof(parasite_break_offsets))
		offset = parasite_break_offsets[self->s.frame - FRAME_break01];
	else if (self->s.frame >= FRAME_drain01 && self->s.frame < FRAME_drain01 + q_countof(parasite_drain_offsets))
		offset = parasite_drain_offsets[self->s.frame - FRAME_drain01];
	else
		offset = { 8, 0, 6 };
	start = M_ProjectFlashSource(self, offset, f, r);
	return start;
}

THINK(proboscis_think) (edict_t *self) -> void
{
	self->nextthink = level.time + FRAME_TIME_S; // start doing stuff on next frame

	// retracting; keep pulling until we hit the parasite
	if (self->style == 2)
	{
		vec3_t start = parasite_get_proboscis_start(self->owner);
		vec3_t dir = (self->s.origin - start);
		float dist = dir.normalize();

		if (dist <= (self->speed * 2) * gi.frame_time_s)
		{
			// reached target; free self on next frame, let parasite know
			self->style = 3;
			self->think = proboscis_reset;
			self->s.origin = start;
			gi.linkentity(self);
			return;
		}

		// pull us in
		self->s.origin -= dir * (self->speed * gi.frame_time_s);
		gi.linkentity(self);
	}
	// stuck on target; do damage, suck health
	// and check if target goes away
	else if (self->style == 1)
	{
		if (!self->enemy)
		{
			// stuck in wall
		}
		else if (!self->enemy->inuse || self->enemy->health <= 0 || !self->enemy->takedamage)
		{
			// target gone, retract early
			proboscis_retract(self);
		}
		else
		{
			// update our position
			self->s.origin = self->enemy->s.origin + self->move_origin;

			vec3_t start = parasite_get_proboscis_start(self->owner);

			self->s.angles = vectoangles((self->s.origin - start).normalized());

			// see if we got cut by the world
			trace_t tr = gi.traceline(start, self->s.origin, nullptr, MASK_SOLID);

			if (tr.fraction != 1.0f)
			{
				// blocked, so retract
				proboscis_retract(self);
				self->s.origin = self->s.old_origin;
			}
			else
			{
				// succ & drain
				if (self->timestamp <= level.time)
				{
					T_Damage(self->enemy, self, self->owner, tr.plane.normal, tr.endpos, tr.plane.normal, 2, 0, DAMAGE_NONE, MOD_UNKNOWN);
					self->owner->health = min(self->owner->max_health, self->owner->health + 2);
					self->owner->monsterinfo.setskin(self->owner);
					self->timestamp = level.time + 10_hz;
				}
			}

			gi.linkentity(self);
		}
	}
	// flying
	else if (self->style == 0)
	{
		// owner gone away?
		if (!self->owner->enemy || !self->owner->enemy->inuse || self->owner->enemy->health <= 0)
		{
			proboscis_retract(self);
			return;
		}

		// if we're well behind our target and missed by 2x velocity,
		// be smart enough to pull in automatically
		vec3_t to_target = (self->s.origin - self->owner->enemy->s.origin);
		float dist_to_target = to_target.normalize();

		if (dist_to_target > (self->speed * 2) / 15.f)
		{
			vec3_t from_owner = (self->s.origin - self->owner->s.origin).normalized();
			float dot = to_target.dot(from_owner);

			if (dot > 0.f)
			{
				proboscis_retract(self);
				return;
			}
		}
	}
}

PRETHINK(proboscis_segment_draw) (edict_t *self) -> void
{
	vec3_t start = parasite_get_proboscis_start(self->owner->owner);

	self->s.origin = start;
	self->s.old_origin = self->owner->s.origin - ((self->owner->s.origin - start).normalized() * 8.f);
	gi.linkentity(self);
}

static void fire_proboscis(edict_t *self, vec3_t start, vec3_t dir, float speed)
{
	edict_t *tip = G_Spawn();
	tip->s.angles = vectoangles(dir);
	tip->s.modelindex = gi.modelindex("models/monsters/parasite/tip/tris.md2");
	tip->movetype = MOVETYPE_FLYMISSILE;
	tip->owner = self;
	self->proboscus = tip;
	tip->clipmask = MASK_PROJECTILE & ~CONTENTS_DEADMONSTER;
	tip->s.origin = tip->s.old_origin = start;
	tip->speed = speed;
	tip->velocity = dir * speed;
	tip->solid = SOLID_BBOX;
	tip->takedamage = true;
	tip->flags |= FL_NO_DAMAGE_EFFECTS | FL_NO_KNOCKBACK;
	tip->die = proboscis_die;
	tip->touch = proboscis_touch;
	tip->think = proboscis_think;
	tip->nextthink = level.time + FRAME_TIME_S; // start doing stuff on next frame
	tip->svflags |= SVF_PROJECTILE;

	edict_t *segment = G_Spawn();
	segment->s.modelindex = gi.modelindex("models/monsters/parasite/segment/tris.md2");
	segment->s.renderfx = RF_BEAM;
	segment->postthink = proboscis_segment_draw;

	tip->proboscus = segment;
	segment->owner = tip;

	trace_t tr = gi.traceline(tip->s.origin, tip->s.origin + (tip->velocity * gi.frame_time_s), self, tip->clipmask);
	if (tr.startsolid)
	{
		tr.plane.normal = -dir;
		tr.endpos = start;
		tip->touch(tip, tr.ent, tr, false);
	}
	else if (tr.fraction < 1.0f)
		tip->touch(tip, tr.ent, tr, false);

	segment->s.origin = start;
	segment->s.old_origin = tip->s.origin + ((tip->s.origin - start).normalized() * 8.f);

	gi.linkentity(tip);
	gi.linkentity(segment);
}

static void parasite_fire_proboscis(edict_t *self)
{
	if (self->proboscus && self->proboscus->style != 2)
		proboscis_reset(self->proboscus);

	vec3_t start = parasite_get_proboscis_start(self);

	vec3_t dir;
	PredictAim(self, self->enemy, start, g_athena_parasite_proboscis_speed, false, crandom_open() * g_athena_parasite_miss_chance, &dir, nullptr);

	fire_proboscis(self, start, dir, g_athena_parasite_proboscis_speed);
}

static void parasite_proboscis_wait(edict_t *self)
{
	// loop frames while we wait
	if (self->s.frame == FRAME_drain04)
		self->monsterinfo.nextframe = FRAME_drain05;
	else
		self->monsterinfo.nextframe = FRAME_drain04;
}

static void parasite_proboscis_pull_wait(edict_t *self)
{
	// prob exploded?
	if (!self->proboscus || self->proboscus->style == 3)
	{
		self->monsterinfo.nextframe = FRAME_drain14;
		return;
	}

	// being pulled in, so wait until we get destroyed
	if (self->s.frame == FRAME_drain12)
		self->monsterinfo.nextframe = FRAME_drain13;
	else
		self->monsterinfo.nextframe = FRAME_drain12;

	if (self->proboscus->style != 2)
		proboscis_retract(self->proboscus);
}

mframe_t parasite_frames_fire_proboscis[] = {
	{ parasite_charge_proboscis, 0, parasite_launch },
	{ parasite_charge_proboscis },
	{ parasite_charge_proboscis, 15, parasite_fire_proboscis }, // Target hits
	{ parasite_charge_proboscis, 0, parasite_proboscis_wait },  // drain
	{ parasite_charge_proboscis, 0, parasite_proboscis_wait },  // drain
	{ parasite_charge_proboscis, 0 },  // drain
	{ parasite_charge_proboscis, 0 },  // drain
	{ parasite_charge_proboscis, -2 }, // drain
	{ parasite_charge_proboscis, -2 }, // drain
	{ parasite_charge_proboscis, -3 }, // drain
	{ parasite_charge_proboscis, -2 }, // drain
	{ parasite_charge_proboscis, 0, parasite_proboscis_pull_wait },  // drain
	{ parasite_charge_proboscis, -1, parasite_proboscis_pull_wait }, // drain
	{ parasite_charge_proboscis, 0, parasite_reel_in },		  // let go
	{ parasite_charge_proboscis, -2 },
	{ parasite_charge_proboscis, -2 },
	{ parasite_charge_proboscis, -3 },
	{ parasite_charge_proboscis }
};
MMOVE_T(parasite_move_fire_proboscis) = { FRAME_drain01, FRAME_drain18, parasite_frames_fire_proboscis, parasite_start_run };

MONSTERINFO_ATTACK(parasite_attack) (edict_t *self) -> void
{
	if (!M_CheckClearShot(self, parasite_drain_offsets[0]))
		return;

	if (self->proboscus && self->proboscus->style != 2)
		proboscis_retract(self->proboscus);

	M_SetAnimation(self, &parasite_move_fire_proboscis);
}

//================
// ROGUE
void parasite_jump_down(edict_t *self)
{
	vec3_t forward, up;

	AngleVectors(self->s.angles, forward, nullptr, up);
	self->velocity += (forward * 100);
	self->velocity += (up * 300);
}

void parasite_jump_up(edict_t *self)
{
	vec3_t forward, up;

	AngleVectors(self->s.angles, forward, nullptr, up);
	self->velocity += (forward * 200);
	self->velocity += (up * 450);
}

void parasite_jump_wait_land(edict_t *self)
{
	if (self->groundentity == nullptr)
	{
		self->monsterinfo.nextframe = self->s.frame;

		if (monster_jump_finished(self))
			self->monsterinfo.nextframe = self->s.frame + 1;
	}
	else
		self->monsterinfo.nextframe = self->s.frame + 1;
}

mframe_t parasite_frames_jump_up[] = {
	{ ai_move, -8 },
	{ ai_move, -8 },
	{ ai_move, -8 },
	{ ai_move, -8, parasite_jump_up },
	{ ai_move },
	{ ai_move },
	{ ai_move, 0, parasite_jump_wait_land },
	{ ai_move }
};
MMOVE_T(parasite_move_jump_up) = { FRAME_jump01, FRAME_jump08, parasite_frames_jump_up, parasite_run };

mframe_t parasite_frames_jump_down[] = {
	{ ai_move },
	{ ai_move },
	{ ai_move },
	{ ai_move, 0, parasite_jump_down },
	{ ai_move },
	{ ai_move },
	{ ai_move, 0, parasite_jump_wait_land },
	{ ai_move }
};
MMOVE_T(parasite_move_jump_down) = { FRAME_jump01, FRAME_jump08, parasite_frames_jump_down, parasite_run };

void parasite_jump(edict_t *self, blocked_jump_result_t result)
{
	if (!self->enemy)
		return;

	if (result == blocked_jump_result_t::JUMP_JUMP_UP)
		M_SetAnimation(self, &parasite_move_jump_up);
	else
		M_SetAnimation(self, &parasite_move_jump_down);
}

/*
===
Blocked
===
*/
MONSTERINFO_BLOCKED(parasite_blocked) (edict_t *self, float dist) -> bool
{
	if (auto result = blocked_checkjump(self, dist); result != blocked_jump_result_t::NO_JUMP)
	{
		if (result != blocked_jump_result_t::JUMP_TURN)
			parasite_jump(self, result);
		return true;
	}

	if (blocked_checkplat(self, dist))
		return true;

	return false;
}
// ROGUE
//================

/*
===
Death Stuff Starts
===
*/

void parasite_dead(edict_t *self)
{
	self->mins = { -16, -16, -24 };
	self->maxs = { 16, 16, -8 };
	monster_dead(self);
}

static void parasite_shrink(edict_t *self)
{
	self->maxs[2] = 0;
	self->svflags |= SVF_DEADMONSTER;
	gi.linkentity(self);
}

mframe_t parasite_frames_death[] = {
	{ ai_move, 0, nullptr, FRAME_stand01 },
	{ ai_move },
	{ ai_move },
	{ ai_move, 0, parasite_shrink },
	{ ai_move, 0, monster_footstep },
	{ ai_move },
	{ ai_move }
};
MMOVE_T(parasite_move_death) = { FRAME_death101, FRAME_death107, parasite_frames_death, parasite_dead };

DIE(parasite_die) (edict_t *self, edict_t *inflictor, edict_t *attacker, int damage, const vec3_t &point, const mod_t &mod) -> void
{
	if (self->proboscus && self->proboscus->style != 2)
		proboscis_reset(self->proboscus);

	// check for gib
	if (M_CheckGib(self, mod))
	{
		gi.sound(self, CHAN_VOICE, gi.soundindex("misc/udeath.wav"), 1, ATTN_NORM, 0);

		self->s.skinnum /= 2;

		ThrowGibs(self, damage, {
			{ 1, "models/objects/gibs/bone/tris.md2" },
			{ 3, "models/objects/gibs/sm_meat/tris.md2" },
			{ "models/monsters/parasite/gibs/chest.md2", GIB_SKINNED },
			{ 2, "models/monsters/parasite/gibs/bleg.md2", GIB_SKINNED | GIB_UPRIGHT },
			{ 2, "models/monsters/parasite/gibs/fleg.md2", GIB_SKINNED | GIB_UPRIGHT },
			{ "models/monsters/parasite/gibs/head.md2", GIB_SKINNED | GIB_HEAD }
		});

		self->deadflag = true;
		return;
	}

	if (self->deadflag)
		return;

	// regular death
	gi.sound(self, CHAN_VOICE, sound_die, 1, ATTN_NORM, 0);
	self->deadflag = true;
	self->takedamage = true;
	M_SetAnimation(self, &parasite_move_death);
}

/*
===
End Death Stuff
===
*/

mframe_t parasite_frames_pain1[] = {
	{ ai_move, 0, nullptr, FRAME_stand01 },
	{ ai_move },
	{ ai_move, 0, [](edict_t *self) { self->monsterinfo.nextframe = FRAME_pain105; } },
	{ ai_move, 0, monster_footstep },
	{ ai_move },
	{ ai_move },
	{ ai_move, 6, monster_footstep },
	{ ai_move, 16 },
	{ ai_move, -6, monster_footstep },
	{ ai_move, -7 },
	{ ai_move }
};
MMOVE_T(parasite_move_pain1) = { FRAME_pain101, FRAME_pain111, parasite_frames_pain1, parasite_start_run };

PAIN(parasite_pain) (edict_t *self, edict_t *other, float kick, int damage, const mod_t &mod) -> void
{
	if (level.time < self->pain_debounce_time)
		return;

	if (self->proboscus && self->proboscus->style != 2)
		proboscis_retract(self->proboscus);

	self->pain_debounce_time = level.time + 3_sec;

	if (frandom() < 0.5f)
		gi.sound(self, CHAN_VOICE, sound_pain1, 1, ATTN_NORM, 0);
	else
		gi.sound(self, CHAN_VOICE, sound_pain2, 1, ATTN_NORM, 0);
	
	if (!M_ShouldReactToPain(self, mod))
		return; // no pain anims in nightmare

	M_SetAnimation(self, &parasite_move_pain1);
}

MONSTERINFO_SETSKIN(parasite_setskin) (edict_t *self) -> void
{
	if (self->health < (self->max_health / 2))
		self->s.skinnum = 1;
	else
		self->s.skinnum = 0;
}

constexpr spawnflags_t SPAWNFLAG_PARASITE_NOJUMPING = 8_spawnflag;

/*QUAKED monster_parasite (1 .5 0) (-16 -16 -24) (16 16 32) Ambush Trigger_Spawn Sight NoJumping
 */
void SP_monster_parasite(edict_t *self)
{
	if ( !M_AllowSpawn( self ) ) {
		G_FreeEdict( self );
		return;
	}

	sound_pain1.assign("parasite/parpain1.wav");
	sound_pain2.assign("parasite/parpain2.wav");
	sound_die.assign("parasite/pardeth1.wav");
	sound_launch.assign("parasite/paratck1.wav");
	sound_impact.assign("parasite/paratck2.wav");
	sound_suck.assign("parasite/paratck3.wav");
	sound_reelin.assign("parasite/paratck4.wav");
	sound_sight.assign("parasite/parsght1.wav");
	sound_tap.assign("parasite/paridle1.wav");
	sound_scratch.assign("parasite/paridle2.wav");
	sound_search.assign("parasite/parsrch1.wav");

	gi.modelindex("models/monsters/parasite/tip/tris.md2");
	gi.modelindex("models/monsters/parasite/segment/tris.md2");

	self->s.modelindex = gi.modelindex("models/monsters/parasite/tris.md2");
	
	gi.modelindex("models/monsters/parasite/gibs/head.md2");
	gi.modelindex("models/monsters/parasite/gibs/chest.md2");
	gi.modelindex("models/monsters/parasite/gibs/bleg.md2");
	gi.modelindex("models/monsters/parasite/gibs/fleg.md2");

	self->mins = { -16, -16, -24 };
	self->maxs = { 16, 16, 24 };
	self->movetype = MOVETYPE_STEP;
	self->solid = SOLID_BBOX;

	self->health = 175 * st.health_multiplier;
	self->gib_health = -50;
	self->mass = 250;

	self->pain = parasite_pain;
	self->die = parasite_die;

	self->monsterinfo.stand = parasite_stand;
	self->monsterinfo.walk = parasite_start_walk;
	self->monsterinfo.run = parasite_start_run;
	self->monsterinfo.attack = parasite_attack;
	self->monsterinfo.sight = parasite_sight;
	self->monsterinfo.idle = parasite_idle;
	self->monsterinfo.blocked = parasite_blocked; // PGM
	self->monsterinfo.setskin = parasite_setskin;

	gi.linkentity(self);

	M_SetAnimation(self, &parasite_move_stand);
	self->monsterinfo.scale = MODEL_SCALE;
	self->yaw_speed = 30;
	self->monsterinfo.can_jump = !self->spawnflags.has(SPAWNFLAG_PARASITE_NOJUMPING);
	self->monsterinfo.drop_height = 256;
	self->monsterinfo.jump_height = 68;

	walkmonster_start(self);
}