/*
 * Copyright (C) 1997-2001 Id Software, Inc.
 * Copyright (c) ZeniMax Media 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.
 *
 * =======================================================================
 *
 * Brain.
 *
 * =======================================================================
 */

#include "../../header/local.h"
#include "brain.h"

static int sound_chest_open;
static int sound_tentacles_extend;
static int sound_tentacles_retract;
static int sound_death;
static int sound_idle1;
static int sound_idle2;
static int sound_idle3;
static int sound_pain1;
static int sound_pain2;
static int sound_sight;
static int sound_search;
static int sound_melee1;
static int sound_melee2;
static int sound_melee3;

void brain_run(edict_t *self);
void brain_dead(edict_t *self);

static int  sound_step;
static int  sound_step2;

void
brain_footstep(edict_t *self)
{
	if (!g_monsterfootsteps->value)
		return;

	// Lazy loading for savegame compatibility.
	if (sound_step == 0 || sound_step2 == 0)
	{
		sound_step = gi.soundindex("brain/step1.wav");
		sound_step2 = gi.soundindex("brain/step2.wav");
	}

	if (randk() % 2 == 0)
	{
		gi.sound(self, CHAN_BODY, sound_step, 1, ATTN_NORM, 0);
	}
	else
	{
		gi.sound(self, CHAN_BODY, sound_step2, 1, ATTN_NORM, 0);
	}
}


void
brain_sight(edict_t *self, edict_t *other /* unused */)
{
	if (!self)
	{
		return;
	}

	gi.sound(self, CHAN_VOICE, sound_sight, 1, ATTN_NORM, 0);
}

void
brain_search(edict_t *self)
{
	if (!self)
	{
		return;
	}

	gi.sound(self, CHAN_VOICE, sound_search, 1, ATTN_NORM, 0);
}

/* STAND */

static mframe_t brain_frames_stand[] = {
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},

	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},

	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL}
};

mmove_t brain_move_stand =
{
	FRAME_stand01,
	FRAME_stand30,
	brain_frames_stand,
	NULL
};

void
brain_stand(edict_t *self)
{
	if (!self)
	{
		return;
	}

	self->monsterinfo.currentmove = &brain_move_stand;
}

/* IDLE */

static mframe_t brain_frames_idle[] = {
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},

	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},

	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL}
};

mmove_t brain_move_idle =
{
	FRAME_stand31,
	FRAME_stand60,
	brain_frames_idle,
	brain_stand
};

void
brain_idle(edict_t *self)
{
	if (!self)
	{
		return;
	}

	gi.sound(self, CHAN_AUTO, sound_idle3, 1, ATTN_IDLE, 0);
	self->monsterinfo.currentmove = &brain_move_idle;
}

/* WALK */

static mframe_t brain_frames_walk1[] = {
	{ai_walk, 7, NULL},
	{ai_walk, 2, NULL},
	{ai_walk, 3, NULL},
	{ai_walk, 3, brain_footstep},
	{ai_walk, 1, NULL},
	{ai_walk, 0, NULL},
	{ai_walk, 0, NULL},
	{ai_walk, 9, NULL},
	{ai_walk, -4, NULL},
	{ai_walk, -1, brain_footstep},
	{ai_walk, 2, NULL}
};

mmove_t brain_move_walk1 =
{
	FRAME_walk101,
	FRAME_walk111,
	brain_frames_walk1,
	NULL
};

void
brain_walk(edict_t *self)
{
	if (!self)
	{
		return;
	}

	self->monsterinfo.currentmove = &brain_move_walk1;
}

static mframe_t brain_frames_defense[] = {
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL}
};

mmove_t brain_move_defense =
{
	FRAME_defens01,
	FRAME_defens08,
	brain_frames_defense,
	NULL
};

static mframe_t brain_frames_pain3[] = {
	{ai_move, -2, NULL},
	{ai_move, 2, NULL},
	{ai_move, 1, NULL},
	{ai_move, 3, NULL},
	{ai_move, 0, NULL},
	{ai_move, -4, NULL}
};

mmove_t brain_move_pain3 =
{
	FRAME_pain301,
	FRAME_pain306,
	brain_frames_pain3,
	brain_run
};

static mframe_t brain_frames_pain2[] = {
	{ai_move, -2, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 3, NULL},
	{ai_move, 1, NULL},
	{ai_move, -2, NULL}
};

mmove_t brain_move_pain2 =
{
	FRAME_pain201,
	FRAME_pain208,
	brain_frames_pain2,
	brain_run
};

static mframe_t brain_frames_pain1[] = {
	{ai_move, -6, NULL},
	{ai_move, -2, NULL},
	{ai_move, -6, brain_footstep},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 2, NULL},
	{ai_move, 0, NULL},
	{ai_move, 2, NULL},
	{ai_move, 1, NULL},
	{ai_move, 7, NULL},
	{ai_move, 0, NULL},
	{ai_move, 3, brain_footstep},
	{ai_move, -1, NULL}
};

mmove_t brain_move_pain1 =
{
	FRAME_pain101,
	FRAME_pain121,
	brain_frames_pain1,
	brain_run
};

/* DUCK */

void
brain_duck_down(edict_t *self)
{
	if (!self)
	{
		return;
	}

	if (self->monsterinfo.aiflags & AI_DUCKED)
	{
		return;
	}

	self->monsterinfo.aiflags |= AI_DUCKED;
	self->maxs[2] -= 32;
	self->takedamage = DAMAGE_YES;
	gi.linkentity(self);
}

void
brain_duck_hold(edict_t *self)
{
	if (!self)
	{
		return;
	}

	if (level.time >= self->monsterinfo.pausetime)
	{
		self->monsterinfo.aiflags &= ~AI_HOLD_FRAME;
	}
	else
	{
		self->monsterinfo.aiflags |= AI_HOLD_FRAME;
	}
}

void
brain_duck_up(edict_t *self)
{
	if (!self)
	{
		return;
	}

	self->monsterinfo.aiflags &= ~AI_DUCKED;
	self->maxs[2] += 32;
	self->takedamage = DAMAGE_AIM;
	gi.linkentity(self);
}

static mframe_t brain_frames_duck[] = {
	{ai_move, 0, NULL},
	{ai_move, -2, brain_duck_down},
	{ai_move, 17, brain_duck_hold},
	{ai_move, -3, brain_footstep},
	{ai_move, -1, brain_duck_up},
	{ai_move, -5, NULL},
	{ai_move, -6, NULL},
	{ai_move, -6, brain_footstep}
};

mmove_t brain_move_duck =
{
	FRAME_duck01,
	FRAME_duck08,
	brain_frames_duck,
	brain_run
};

void
brain_dodge(edict_t *self, edict_t *attacker, float eta,
	trace_t *tr /* unused */)
{
	if (!self || !attacker)
	{
		return;
	}

	if (random() > 0.25)
	{
		return;
	}

	if (!self->enemy)
	{
		self->enemy = attacker;
		FoundTarget(self);
	}

	self->monsterinfo.pausetime = level.time + eta + 0.5;
	self->monsterinfo.currentmove = &brain_move_duck;
}

static mframe_t brain_frames_death2[] = {
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 9, NULL},
	{ai_move, 0, NULL}
};

mmove_t brain_move_death2 =
{
	FRAME_death201,
	FRAME_death205,
	brain_frames_death2,
	brain_dead
};

static mframe_t brain_frames_death1[] = {
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, -2, NULL},
	{ai_move, 9, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL}
};

mmove_t brain_move_death1 =
{
	FRAME_death101,
	FRAME_death118,
	brain_frames_death1,
	brain_dead
};

/* MELEE */

void
brain_swing_right(edict_t *self)
{
	if (!self)
	{
		return;
	}

	gi.sound(self, CHAN_BODY, sound_melee1, 1, ATTN_NORM, 0);
}

void
brain_hit_right(edict_t *self)
{
	vec3_t aim;

	if (!self)
	{
		return;
	}

	VectorSet(aim, MELEE_DISTANCE, self->maxs[0], 8);

	if (fire_hit(self, aim, (15 + (randk() % 5)), 40))
	{
		gi.sound(self, CHAN_WEAPON, sound_melee3, 1, ATTN_NORM, 0);
	}
}

void
brain_swing_left(edict_t *self)
{
	if (!self)
	{
		return;
	}

	gi.sound(self, CHAN_BODY, sound_melee2, 1, ATTN_NORM, 0);
}

void
brain_hit_left(edict_t *self)
{
	vec3_t aim;

	if (!self)
	{
		return;
	}

	VectorSet(aim, MELEE_DISTANCE, self->mins[0], 8);

	if (fire_hit(self, aim, (15 + (randk() % 5)), 40))
	{
		gi.sound(self, CHAN_WEAPON, sound_melee3, 1, ATTN_NORM, 0);
	}
}

static mframe_t brain_frames_attack1[] = {
	{ai_charge, 8, NULL},
	{ai_charge, 3, NULL},
	{ai_charge, 5, NULL},
	{ai_charge, 0, brain_footstep},
	{ai_charge, -3, brain_swing_right},
	{ai_charge, 0, NULL},
	{ai_charge, -5, NULL},
	{ai_charge, -7, brain_hit_right},
	{ai_charge, 0, NULL},
	{ai_charge, 6, brain_swing_left},
	{ai_charge, 1, NULL},
	{ai_charge, 2, brain_hit_left},
	{ai_charge, -3, NULL},
	{ai_charge, 6, NULL},
	{ai_charge, -1, NULL},
	{ai_charge, -3, NULL},
	{ai_charge, 2, NULL},
	{ai_charge, -11, brain_footstep}
};

mmove_t brain_move_attack1 =
{
	FRAME_attak101,
	FRAME_attak118,
	brain_frames_attack1,
	brain_run
};

void
brain_chest_open(edict_t *self)
{
	if (!self)
	{
		return;
	}

	self->spawnflags &= ~65536;
	self->monsterinfo.power_armor_type = POWER_ARMOR_NONE;
	gi.sound(self, CHAN_BODY, sound_chest_open, 1, ATTN_NORM, 0);
}

void
brain_tentacle_attack(edict_t *self)
{
	vec3_t aim;

	if (!self)
	{
		return;
	}

	VectorSet(aim, MELEE_DISTANCE, 0, 8);

	if (fire_hit(self, aim, (10 + (randk() % 5)), -600) && (skill->value > SKILL_EASY))
	{
		self->spawnflags |= 65536;
	}

	gi.sound(self, CHAN_WEAPON, sound_tentacles_retract, 1, ATTN_NORM, 0);
}

void
brain_chest_closed(edict_t *self)
{
	if (!self)
	{
		return;
	}

	self->monsterinfo.power_armor_type = POWER_ARMOR_SCREEN;

	if (self->spawnflags & 65536)
	{
		self->spawnflags &= ~65536;
		self->monsterinfo.currentmove = &brain_move_attack1;
	}
}

static mframe_t brain_frames_attack2[] = {
	{ai_charge, 5, NULL},
	{ai_charge, -4, NULL},
	{ai_charge, -4, NULL},
	{ai_charge, -3, NULL},
	{ai_charge, 0, brain_chest_open},
	{ai_charge, 0, NULL},
	{ai_charge, 13, brain_tentacle_attack},
	{ai_charge, 0, NULL},
	{ai_charge, 2, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, -9, brain_chest_closed},
	{ai_charge, 0, NULL},
	{ai_charge, 4, NULL},
	{ai_charge, 3, NULL},
	{ai_charge, 2, NULL},
	{ai_charge, -3, NULL},
	{ai_charge, -6, NULL}
};

mmove_t brain_move_attack2 =
{
	FRAME_attak201,
	FRAME_attak217,
	brain_frames_attack2,
	brain_run
};

void
brain_melee(edict_t *self)
{
	if (!self)
	{
		return;
	}

	if (random() <= 0.5)
	{
		self->monsterinfo.currentmove = &brain_move_attack1;
	}
	else
	{
		self->monsterinfo.currentmove = &brain_move_attack2;
	}
}

static qboolean
brain_tounge_attack_ok(vec3_t start, vec3_t end)
{
	vec3_t dir, angles;

	/* check for max distance */
	VectorSubtract(start, end, dir);

	if (VectorLength(dir) > 512)
	{
		return false;
	}

	/* check for min/max pitch */
	vectoangles(dir, angles);

	if (angles[0] < -180)
	{
		angles[0] += 360;
	}

	if (fabs(angles[0]) > 30)
	{
		return false;
	}

	return true;
}

void
brain_tounge_attack(edict_t *self)
{
	vec3_t offset, start, f, r, end, dir;
	trace_t tr;
	int damage;

	if (!self)
	{
		return;
	}

	AngleVectors(self->s.angles, f, r, NULL);
	VectorSet(offset, 24, 0, 16);
	G_ProjectSource(self->s.origin, offset, f, r, start);

	VectorCopy(self->enemy->s.origin, end);

	if (!brain_tounge_attack_ok(start, end))
	{
		end[2] = self->enemy->s.origin[2] + self->enemy->maxs[2] - 8;

		if (!brain_tounge_attack_ok(start, end))
		{
			end[2] = self->enemy->s.origin[2] + self->enemy->mins[2] + 8;

			if (!brain_tounge_attack_ok(start, end))
			{
				return;
			}
		}
	}

	VectorCopy(self->enemy->s.origin, end);

	tr = gi.trace(start, NULL, NULL, end, self, MASK_SHOT);

	if (tr.ent != self->enemy)
	{
		return;
	}

	damage = 5;
	gi.sound(self, CHAN_WEAPON, sound_tentacles_retract, 1, ATTN_NORM, 0);

	gi.WriteByte(svc_temp_entity);
	gi.WriteByte(TE_PARASITE_ATTACK);
	gi.WriteShort(self - g_edicts);
	gi.WritePosition(start);
	gi.WritePosition(end);
	gi.multicast(self->s.origin, MULTICAST_PVS);

	VectorSubtract(start, end, dir);
	T_Damage(self->enemy, self, self, dir, self->enemy->s.origin,
			vec3_origin, damage, 0, DAMAGE_NO_KNOCKBACK, MOD_BRAINTENTACLE);

	/* pull the enemy in */
	vec3_t forward;
	self->s.origin[2] += 1;
	AngleVectors(self->s.angles, forward, NULL, NULL);
	VectorScale(forward, -1200, self->enemy->velocity);
}

/* Brian right eye center */
struct r_eyeball
{
	float x;
	float y;
	float z;
} brain_reye[11] = {
	{0.746700, 0.238370, 34.167690},
	{-1.076390, 0.238370, 33.386372},
	{-1.335500, 5.334300, 32.177170},
	{-0.175360, 8.846370, 30.635479},
	{-2.757590, 7.804610, 30.150860},
	{-5.575090, 5.152840, 30.056160},
	{-7.017550, 3.262470, 30.552521},
	{-7.915740, 0.638800, 33.176189},
	{-3.915390, 8.285730, 33.976349},
	{-0.913540, 10.933030, 34.141811},
	{-0.369900, 8.923900, 34.189079}
};

/* Brain left eye center */
struct l_eyeball
{
	float x;
	float y;
	float z;
} brain_leye[11] = {
	{-3.364710, 0.327750, 33.938381},
	{-5.140450, 0.493480, 32.659851},
	{-5.341980, 5.646980, 31.277901},
	{-4.134480, 9.277440, 29.925621},
	{-6.598340, 6.815090, 29.322620},
	{-8.610840, 2.529650, 29.251591},
	{-9.231360, 0.093280, 29.747959},
	{-11.004110, 1.936930, 32.395260},
	{-7.878310, 7.648190, 33.148151},
	{-4.947370, 11.430050, 33.313610},
	{-4.332820, 9.444570, 33.526340}
};

void
brain_laserbeam(edict_t *self)
{
	vec3_t forward, right, up;
	vec3_t tempang, start;
	vec3_t dir, angles, end;
	edict_t *ent;

	if (!self)
	{
		return;
	}

	if (random() > 0.8)
	{
		gi.sound(self, CHAN_AUTO, gi.soundindex("misc/lasfly.wav"),
				1, ATTN_STATIC, 0);
	}

	/* check for max distance */
	VectorCopy(self->s.origin, start);
	VectorCopy(self->enemy->s.origin, end);
	VectorSubtract(end, start, dir);
	vectoangles(dir, angles);

	/* dis is my right eye */
	ent = G_Spawn();
	VectorCopy(self->s.origin, ent->s.origin);
	VectorCopy(angles, tempang);
	AngleVectors(tempang, forward, right, up);
	VectorCopy(tempang, ent->s.angles);
	VectorCopy(ent->s.origin, start);
	VectorMA(start, brain_reye[self->s.frame - FRAME_walk101].x, right, start);
	VectorMA(start, brain_reye[self->s.frame - FRAME_walk101].y, forward, start);
	VectorMA(start, brain_reye[self->s.frame - FRAME_walk101].z, up, start);
	VectorCopy(start, ent->s.origin);
	ent->enemy = self->enemy;
	ent->owner = self;
	ent->dmg = 1;
	monster_dabeam(ent);

	/* dis is me left eye */
	ent = G_Spawn();
	VectorCopy(self->s.origin, ent->s.origin);
	VectorCopy(angles, tempang);
	AngleVectors(tempang, forward, right, up);
	VectorCopy(tempang, ent->s.angles);
	VectorCopy(ent->s.origin, start);
	VectorMA(start, brain_leye[self->s.frame - FRAME_walk101].x, right, start);
	VectorMA(start, brain_leye[self->s.frame - FRAME_walk101].y, forward, start);
	VectorMA(start, brain_leye[self->s.frame - FRAME_walk101].z, up, start);
	VectorCopy(start, ent->s.origin);
	ent->enemy = self->enemy;
	ent->owner = self;
	ent->dmg = 1;
	monster_dabeam(ent);
}

void
brain_laserbeam_reattack(edict_t *self)
{
	if (!self)
	{
		return;
	}

	if (random() < 0.5)
	{
		if (visible(self, self->enemy))
		{
			if (self->enemy->health > 0)
			{
				self->s.frame = FRAME_walk101;
			}
		}
	}
}

static mframe_t brain_frames_attack3[] = {
	{ai_charge, 5, NULL},
	{ai_charge, -4, NULL},
	{ai_charge, -4, NULL},
	{ai_charge, -3, NULL},
	{ai_charge, 0, brain_chest_open},
	{ai_charge, 0, brain_tounge_attack},
	{ai_charge, 13, NULL},
	{ai_charge, 0, brain_tentacle_attack},
	{ai_charge, 2, NULL},
	{ai_charge, 0, brain_tounge_attack},
	{ai_charge, -9, brain_chest_closed},
	{ai_charge, 0, NULL},
	{ai_charge, 4, NULL},
	{ai_charge, 3, NULL},
	{ai_charge, 2, NULL},
	{ai_charge, -3, NULL},
	{ai_charge, -6, NULL}
};

mmove_t brain_move_attack3 = {
	FRAME_attak201,
	FRAME_attak217,
	brain_frames_attack3,
	brain_run
};

static mframe_t brain_frames_attack4[] = {
	{ai_charge, 9, brain_laserbeam},
	{ai_charge, 2, brain_laserbeam},
	{ai_charge, 3, brain_laserbeam},
	{ai_charge, 3, brain_laserbeam},
	{ai_charge, 1, brain_laserbeam},
	{ai_charge, 0, brain_laserbeam},
	{ai_charge, 0, brain_laserbeam},
	{ai_charge, 10, brain_laserbeam},
	{ai_charge, -4, brain_laserbeam},
	{ai_charge, -1, brain_laserbeam},
	{ai_charge, 2, brain_laserbeam_reattack}
};

mmove_t brain_move_attack4 = {
	FRAME_walk101,
	FRAME_walk111,
	brain_frames_attack4,
	brain_run
};

void
brain_attack(edict_t *self)
{
	int r;

	if (!self)
	{
		return;
	}

	if (random() < 0.8)
	{
		r = range(self, self->enemy);

		if (r == RANGE_NEAR)
		{
			if (random() < 0.5)
			{
				self->monsterinfo.currentmove = &brain_move_attack3;
			}
			else
			{
				self->monsterinfo.currentmove = &brain_move_attack4;
			}
		}
		else if (r > RANGE_NEAR)
		{
			self->monsterinfo.currentmove = &brain_move_attack4;
		}
	}
}

/* RUN */

static mframe_t brain_frames_run[] = {
	{ai_run, 9, NULL},
	{ai_run, 2, NULL},
	{ai_run, 3, NULL},
	{ai_run, 3, brain_footstep},
	{ai_run, 1, NULL},
	{ai_run, 0, NULL},
	{ai_run, 0, NULL},
	{ai_run, 10, NULL},
	{ai_run, -4, NULL},
	{ai_run, -1, brain_footstep},
	{ai_run, 2, NULL}
};

mmove_t brain_move_run =
{
	FRAME_walk101,
	FRAME_walk111,
	brain_frames_run,
	NULL
};

void
brain_run(edict_t *self)
{
	if (!self)
	{
		return;
	}

	self->monsterinfo.power_armor_type = POWER_ARMOR_SCREEN;

	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
	{
		self->monsterinfo.currentmove = &brain_move_stand;
	}
	else
	{
		self->monsterinfo.currentmove = &brain_move_run;
	}
}

void
brain_pain(edict_t *self, edict_t *other /* unused */,
		float kick /* unused */, int damage /* unused */)
{
	float r;

	if (!self)
	{
		return;
	}

	if (self->health < (self->max_health / 2))
	{
		self->s.skinnum = 1;
	}

	if (level.time < self->pain_debounce_time)
	{
		return;
	}

	self->pain_debounce_time = level.time + 3;

	if (skill->value == SKILL_HARDPLUS)
	{
		return; /* no pain anims in nightmare */
	}

	r = random();

	if (r < 0.33)
	{
		gi.sound(self, CHAN_VOICE, sound_pain1, 1, ATTN_NORM, 0);
		self->monsterinfo.currentmove = &brain_move_pain1;
	}
	else if (r < 0.66)
	{
		gi.sound(self, CHAN_VOICE, sound_pain2, 1, ATTN_NORM, 0);
		self->monsterinfo.currentmove = &brain_move_pain2;
	}
	else
	{
		gi.sound(self, CHAN_VOICE, sound_pain1, 1, ATTN_NORM, 0);
		self->monsterinfo.currentmove = &brain_move_pain3;
	}

	/* clear duck flag */
	if (self->monsterinfo.aiflags & AI_DUCKED)
	{
		monster_duck_up(self);
	}
}

void
brain_dead(edict_t *self)
{
	if (!self)
	{
		return;
	}

	VectorSet(self->mins, -16, -16, -24);
	VectorSet(self->maxs, 16, 16, -8);
	self->movetype = MOVETYPE_TOSS;
	self->svflags |= SVF_DEADMONSTER;
	self->nextthink = 0;
	gi.linkentity(self);
}

void
brain_die(edict_t *self, edict_t *inflictor /* unused */, edict_t *attacker /* unused */,
		int damage, vec3_t point /* unused */)
{
	int n;

	if (!self)
	{
		return;
	}

	self->s.effects = 0;
	self->monsterinfo.power_armor_type = POWER_ARMOR_NONE;

	/* check for gib */
	if (self->health <= self->gib_health)
	{
		gi.sound(self, CHAN_VOICE, gi.soundindex("misc/udeath.wav"),
				1, ATTN_NORM, 0);

		for (n = 0; n < 2; n++)
		{
			ThrowGib(self, "models/objects/gibs/bone/tris.md2",
					damage, GIB_ORGANIC);
		}

		for (n = 0; n < 4; n++)
		{
			ThrowGib(self, "models/objects/gibs/sm_meat/tris.md2",
					damage, GIB_ORGANIC);
		}

		ThrowHead(self, "models/objects/gibs/head2/tris.md2",
				damage, GIB_ORGANIC);
		self->deadflag = DEAD_DEAD;
		return;
	}

	if (self->deadflag == DEAD_DEAD)
	{
		return;
	}

	/* regular death */
	gi.sound(self, CHAN_VOICE, sound_death, 1, ATTN_NORM, 0);
	self->deadflag = DEAD_DEAD;
	self->takedamage = DAMAGE_YES;

	if (random() <= 0.5)
	{
		self->monsterinfo.currentmove = &brain_move_death1;
	}
	else
	{
		self->monsterinfo.currentmove = &brain_move_death2;
	}
}

void
brain_duck(edict_t *self, float eta)
{
	if (!self)
	{
		return;
	}

	/* has to be done immediately otherwise he can get stuck */
	monster_duck_down(self);

	if (skill->value == SKILL_EASY)
	{
		/* PMM - stupid dodge */
		self->monsterinfo.duck_wait_time = level.time + eta + 1;
	}
	else
	{
		self->monsterinfo.duck_wait_time = level.time + eta + (0.1 * (3 - skill->value));
	}

	self->monsterinfo.currentmove = &brain_move_duck;
	self->monsterinfo.nextframe = FRAME_duck01;
	return;
}

/*
 * QUAKED monster_brain (1 .5 0) (-16 -16 -24) (16 16 32) Ambush Trigger_Spawn Sight
 */
void
SP_monster_brain(edict_t *self)
{
	if (!self)
	{
		return;
	}

	if (deathmatch->value)
	{
		G_FreeEdict(self);
		return;
	}

	// Force recaching at next footstep to ensure
	// that the sound indices are correct.
	sound_step = 0;
	sound_step2 = 0;

	sound_chest_open = gi.soundindex("brain/brnatck1.wav");
	sound_tentacles_extend = gi.soundindex("brain/brnatck2.wav");
	sound_tentacles_retract = gi.soundindex("brain/brnatck3.wav");
	sound_death = gi.soundindex("brain/brndeth1.wav");
	sound_idle1 = gi.soundindex("brain/brnidle1.wav");
	sound_idle2 = gi.soundindex("brain/brnidle2.wav");
	sound_idle3 = gi.soundindex("brain/brnlens1.wav");
	sound_pain1 = gi.soundindex("brain/brnpain1.wav");
	sound_pain2 = gi.soundindex("brain/brnpain2.wav");
	sound_sight = gi.soundindex("brain/brnsght1.wav");
	sound_search = gi.soundindex("brain/brnsrch1.wav");
	sound_melee1 = gi.soundindex("brain/melee1.wav");
	sound_melee2 = gi.soundindex("brain/melee2.wav");
	sound_melee3 = gi.soundindex("brain/melee3.wav");

	self->movetype = MOVETYPE_STEP;
	self->solid = SOLID_BBOX;
	self->s.modelindex = gi.modelindex("models/monsters/brain/tris.md2");
	VectorSet(self->mins, -16, -16, -24);
	VectorSet(self->maxs, 16, 16, 32);

	self->health = 300 * st.health_multiplier;
	self->gib_health = -150;
	self->mass = 400;

	self->pain = brain_pain;
	self->die = brain_die;

	self->monsterinfo.stand = brain_stand;
	self->monsterinfo.walk = brain_walk;
	self->monsterinfo.run = brain_run;
	self->monsterinfo.attack = brain_attack;
	self->monsterinfo.dodge = brain_dodge;
	self->monsterinfo.duck = brain_duck;
	self->monsterinfo.unduck = monster_duck_up;
	self->monsterinfo.melee = brain_melee;
	self->monsterinfo.sight = brain_sight;
	self->monsterinfo.search = brain_search;
	self->monsterinfo.idle = brain_idle;

	self->monsterinfo.power_armor_type = POWER_ARMOR_SCREEN;
	self->monsterinfo.power_armor_power = 100;

	gi.linkentity(self);

	self->monsterinfo.currentmove = &brain_move_stand;
	self->monsterinfo.scale = MODEL_SCALE;

	walkmonster_start(self);
}
