/*
 * 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.
 *
 * =======================================================================
 *
 * Parasite.
 *
 * =======================================================================
 */

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

static int sound_pain1;
static int sound_pain2;
static int sound_die;
static int sound_launch;
static int sound_impact;
static int sound_suck;
static int sound_reelin;
static int sound_sight;
static int sound_tap;
static int sound_scratch;
static int 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_start_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)
{
	if (!self)
	{
		return;
	}

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

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

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

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

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

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

	gi.sound(self, CHAN_WEAPON, sound_tap, 1, ATTN_IDLE, 0);
}

void
parasite_footstep(edict_t *self)
{
	if (g_monsterfootsteps->value)
	{
		parasite_tap(self);
	}
}

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

	gi.sound(self, CHAN_WEAPON, sound_scratch, 1, ATTN_IDLE, 0);
}

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

	gi.sound(self, CHAN_WEAPON, sound_search, 1, ATTN_IDLE, 0);
}

static mframe_t parasite_frames_start_fidget[] = {
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL}
};

mmove_t parasite_move_start_fidget =
{
	FRAME_stand18,
	FRAME_stand21,
   	parasite_frames_start_fidget,
   	parasite_do_fidget
};

static mframe_t parasite_frames_fidget[] = {
	{ai_stand, 0, parasite_scratch},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, parasite_scratch},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL}
};

mmove_t parasite_move_fidget =
{
	FRAME_stand22,
   	FRAME_stand27,
   	parasite_frames_fidget,
   	parasite_refidget
};

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

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

	self->monsterinfo.currentmove = &parasite_move_end_fidget;
}

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

	self->monsterinfo.currentmove = &parasite_move_fidget;
}

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

	if (random() <= 0.8)
	{
		self->monsterinfo.currentmove = &parasite_move_fidget;
	}
	else
	{
		self->monsterinfo.currentmove = &parasite_move_end_fidget;
	}
}

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

	self->monsterinfo.currentmove = &parasite_move_start_fidget;
}

static mframe_t parasite_frames_stand[] = {
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, parasite_tap},
	{ai_stand, 0, NULL},
	{ai_stand, 0, parasite_tap},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, parasite_tap},
	{ai_stand, 0, NULL},
	{ai_stand, 0, parasite_tap},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, NULL},
	{ai_stand, 0, parasite_tap},
	{ai_stand, 0, NULL},
	{ai_stand, 0, parasite_tap}
};

mmove_t parasite_move_stand =
{
	FRAME_stand01,
	FRAME_stand17,
   	parasite_frames_stand,
   	parasite_stand
};

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

	self->monsterinfo.currentmove = &parasite_move_stand;
}

static mframe_t parasite_frames_run[] = {
	{ai_run, 30, NULL},
	{ai_run, 30, NULL},
	{ai_run, 22, parasite_footstep},
	{ai_run, 19, parasite_footstep},
	{ai_run, 24, NULL},
	{ai_run, 28, parasite_footstep},
	{ai_run, 25, NULL}
};

mmove_t parasite_move_run =
{
	FRAME_run03,
	FRAME_run09,
	parasite_frames_run,
	NULL
};

static mframe_t parasite_frames_start_run[] = {
	{ai_run, 0, NULL},
	{ai_run, 30, NULL},
};

mmove_t parasite_move_start_run =
{
	FRAME_run01,
	FRAME_run02,
   	parasite_frames_start_run,
   	parasite_run
};

static mframe_t parasite_frames_stop_run[] = {
	{ai_run, 20, NULL},
	{ai_run, 20, NULL},
	{ai_run, 12, parasite_footstep},
	{ai_run, 10, NULL},
	{ai_run, 0, NULL},
	{ai_run, 0, NULL}
};

mmove_t parasite_move_stop_run =
{
	FRAME_run10,
	FRAME_run15,
	parasite_frames_stop_run,
	NULL
};

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

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

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

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

static mframe_t parasite_frames_walk[] = {
	{ai_walk, 30, NULL},
	{ai_walk, 30, NULL},
	{ai_walk, 22, parasite_footstep},
	{ai_walk, 19, NULL},
	{ai_walk, 24, parasite_footstep},
	{ai_walk, 28, parasite_footstep},
	{ai_walk, 25, NULL}
};

mmove_t parasite_move_walk =
{
	FRAME_run03,
	FRAME_run09,
	parasite_frames_walk,
	parasite_walk
};

static mframe_t parasite_frames_start_walk[] = {
	{ai_walk, 0, NULL},
	{ai_walk, 30, parasite_walk}
};

mmove_t parasite_move_start_walk =
{
	FRAME_run01,
	FRAME_run02,
   	parasite_frames_start_walk,
   	NULL
};

static mframe_t parasite_frames_stop_walk[] = {
	{ai_walk, 20, NULL},
	{ai_walk, 20, NULL},
	{ai_walk, 12, parasite_footstep},
	{ai_walk, 10, NULL},
	{ai_walk, 0, NULL},
	{ai_walk, 0, NULL}
};

mmove_t parasite_move_stop_walk =
{
	FRAME_run10,
   	FRAME_run15,
   	parasite_frames_stop_walk,
   	NULL
};

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

	self->monsterinfo.currentmove = &parasite_move_start_walk;
}

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

	self->monsterinfo.currentmove = &parasite_move_walk;
}

static mframe_t parasite_frames_pain1[] = {
	{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, 6, NULL},
	{ai_move, 16, NULL},
	{ai_move, -6, NULL},
	{ai_move, -7, NULL},
	{ai_move, 0, NULL}
};

mmove_t parasite_move_pain1 =
{
	FRAME_pain101,
	FRAME_pain111,
   	parasite_frames_pain1,
   	parasite_start_run
};

void
parasite_pain(edict_t *self, edict_t *other /* unused */,
	   	float kick /* unused */, int damage /* unused */)
{
	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 */
	}

	if (random() < 0.5)
	{
		gi.sound(self, CHAN_VOICE, sound_pain1, 1, ATTN_NORM, 0);
	}
	else
	{
		gi.sound(self, CHAN_VOICE, sound_pain2, 1, ATTN_NORM, 0);
	}

	self->monsterinfo.currentmove = &parasite_move_pain1;
}

qboolean
parasite_drain_attack_ok(vec3_t start, vec3_t end)
{
	vec3_t dir, angles;

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

	if (VectorLength(dir) > 256)
	{
		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
parasite_drain_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, 6);
	G_ProjectSource(self->s.origin, offset, f, r, start);

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

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

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

			if (!parasite_drain_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;
	}

	if (self->s.frame == FRAME_drain03)
	{
		damage = 5;
		gi.sound(self->enemy, CHAN_AUTO, sound_impact, 1, ATTN_NORM, 0);
	}
	else
	{
		if (self->s.frame == FRAME_drain04)
		{
			gi.sound(self, CHAN_WEAPON, sound_suck, 1, ATTN_NORM, 0);
		}

		damage = 2;
	}

	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_UNKNOWN);
}

static mframe_t parasite_frames_drain[] = {
	{ai_charge, 0, parasite_launch},
	{ai_charge, 0, NULL},
	{ai_charge, 15, parasite_drain_attack}, /* Target hits */
	{ai_charge, 0, parasite_drain_attack}, /* drain */
	{ai_charge, 0, parasite_drain_attack}, /* drain */
	{ai_charge, 0, parasite_drain_attack}, /* drain */
	{ai_charge, 0, parasite_drain_attack}, /* drain */
	{ai_charge, -2, parasite_drain_attack}, /* drain */
	{ai_charge, -2, parasite_drain_attack}, /* drain */
	{ai_charge, -3, parasite_drain_attack}, /* drain */
	{ai_charge, -2, parasite_drain_attack}, /* drain */
	{ai_charge, 0, parasite_drain_attack}, /* drain */
	{ai_charge, -1, parasite_drain_attack}, /* drain */
	{ai_charge, 0, parasite_reel_in}, /* let go */
	{ai_charge, -2, NULL},
	{ai_charge, -2, NULL},
	{ai_charge, -3, NULL},
	{ai_charge, 0, NULL}
};

mmove_t parasite_move_drain =
{
	FRAME_drain01,
   	FRAME_drain18,
   	parasite_frames_drain,
   	parasite_start_run
};

static mframe_t parasite_frames_break[] = {
	{ai_charge, 0, NULL},
	{ai_charge, -3, NULL},
	{ai_charge, 1, NULL},
	{ai_charge, 2, NULL},
	{ai_charge, -3, NULL},
	{ai_charge, 1, NULL},
	{ai_charge, 1, NULL},
	{ai_charge, 3, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, -18, NULL},
	{ai_charge, 3, NULL},
	{ai_charge, 9, NULL},
	{ai_charge, 6, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, -18, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 8, NULL},
	{ai_charge, 9, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, -18, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL}, /* airborne */
	{ai_charge, 0, NULL}, /* airborne */
	{ai_charge, 0, NULL}, /* slides */
	{ai_charge, 0, NULL}, /* slides */
	{ai_charge, 0, NULL}, /* slides */
	{ai_charge, 0, NULL}, /* slides */
	{ai_charge, 4, NULL},
	{ai_charge, 11, NULL},
	{ai_charge, -2, NULL},
	{ai_charge, -5, NULL},
	{ai_charge, 1, NULL}
};

mmove_t parasite_move_break =
{
	FRAME_break01,
	FRAME_break32,
	parasite_frames_break,
   	parasite_start_run
};

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

	self->monsterinfo.currentmove = &parasite_move_drain;
}

void
parasite_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);
}

static mframe_t parasite_frames_death[] = {
	{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 parasite_move_death =
{
	FRAME_death101,
   	FRAME_death107,
   	parasite_frames_death,
   	parasite_dead
};

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

  	if (!self)
	{
		return;
	}

	/* 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_die, 1, ATTN_NORM, 0);
	self->deadflag = DEAD_DEAD;
	self->takedamage = DAMAGE_YES;
	self->monsterinfo.currentmove = &parasite_move_death;
}

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

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

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

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

	self->health = 175;
	self->gib_health = -50;
	self->mass = 250;
	self->viewheight = 16;

	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;

	gi.linkentity(self);

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

	walkmonster_start(self);
}
