/*
 * 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.
 *
 * =======================================================================
 *
 * Gunner.
 *
 * =======================================================================
 */

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

static int sound_pain;
static int sound_pain2;
static int sound_death;
static int sound_idle;
static int sound_open;
static int sound_search;
static int sound_sight;

static int  sound_step;
static int  sound_step2;

qboolean visible(edict_t *self, edict_t *other);
void GunnerGrenade(edict_t *self);
void GunnerFire(edict_t *self);
void gunner_fire_chain(edict_t *self);
void gunner_refire_chain(edict_t *self);
void gunner_stand(edict_t *self);

void
gunner_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("gunner/step1.wav");
		sound_step2 = gi.soundindex("gunner/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
gunner_idlesound(edict_t *self)
{
	if (!self)
	{
		return;
	}

	gi.sound(self, CHAN_VOICE, sound_idle, 1, ATTN_IDLE, 0);
}

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

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

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

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

static mframe_t gunner_frames_fidget[] = {
	{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, gunner_idlesound},
	{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},
	{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 gunner_move_fidget =
{
	FRAME_stand31,
   	FRAME_stand70,
	gunner_frames_fidget,
   	gunner_stand
};

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

	if (self->enemy)
	{
		return;
	}

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

	if (random() <= 0.05)
	{
		self->monsterinfo.currentmove = &gunner_move_fidget;
	}
}

static mframe_t gunner_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, gunner_fidget},

	{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, gunner_fidget},

	{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, gunner_fidget}
};

mmove_t gunner_move_stand =
{
	FRAME_stand01,
	FRAME_stand30,
	gunner_frames_stand,
	NULL
};

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

	self->monsterinfo.currentmove = &gunner_move_stand;
}

static mframe_t gunner_frames_walk[] = {
	{ai_walk, 0, gunner_footstep},
	{ai_walk, 3, NULL},
	{ai_walk, 4, NULL},
	{ai_walk, 5, NULL},
	{ai_walk, 7, NULL},
	{ai_walk, 2, gunner_footstep},
	{ai_walk, 6, NULL},
	{ai_walk, 4, NULL},
	{ai_walk, 2, NULL},
	{ai_walk, 7, NULL},
	{ai_walk, 5, NULL},
	{ai_walk, 7, NULL},
	{ai_walk, 4, gunner_footstep}
};

mmove_t gunner_move_walk =
{
	FRAME_walk07,
	FRAME_walk19,
	gunner_frames_walk,
	NULL
};

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

	self->monsterinfo.currentmove = &gunner_move_walk;
}

static mframe_t gunner_frames_run[] = {
	{ai_run, 26, NULL},
	{ai_run, 9, gunner_footstep},
	{ai_run, 9, NULL},
	{ai_run, 9, NULL},
	{ai_run, 15, NULL},
	{ai_run, 10, gunner_footstep},
	{ai_run, 13, NULL},
	{ai_run, 6, NULL}
};

mmove_t gunner_move_run =
{
	FRAME_run01,
   	FRAME_run08,
	gunner_frames_run,
	NULL
};

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

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

static mframe_t gunner_frames_runandshoot[] = {
	{ai_run, 32, NULL},
	{ai_run, 15, gunner_footstep},
	{ai_run, 10, NULL},
	{ai_run, 18, NULL},
	{ai_run, 8, gunner_footstep},
	{ai_run, 20, NULL}
};

mmove_t gunner_move_runandshoot =
{
	FRAME_runs01,
	FRAME_runs06,
   	gunner_frames_runandshoot,
	NULL
};

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

	self->monsterinfo.currentmove = &gunner_move_runandshoot;
}

static mframe_t gunner_frames_pain3[] = {
	{ai_move, -3, NULL},
	{ai_move, 1, NULL},
	{ai_move, 1, NULL},
	{ai_move, 0, NULL},
	{ai_move, 1, NULL}
};

mmove_t gunner_move_pain3 =
{
	FRAME_pain301,
	FRAME_pain305,
	gunner_frames_pain3,
	gunner_run
};

static mframe_t gunner_frames_pain2[] = {
	{ai_move, -2, NULL},
	{ai_move, 11, NULL},
	{ai_move, 6, gunner_footstep},
	{ai_move, 2, NULL},
	{ai_move, -1, NULL},
	{ai_move, -7, NULL},
	{ai_move, -2, NULL},
	{ai_move, -7, gunner_footstep}
};

mmove_t gunner_move_pain2 =
{
	FRAME_pain201,
	FRAME_pain208,
	gunner_frames_pain2,
	gunner_run
};

static mframe_t gunner_frames_pain1[] = {
	{ai_move, 2, NULL},
	{ai_move, 0, NULL},
	{ai_move, -5, gunner_footstep},
	{ai_move, 3, NULL},
	{ai_move, -1, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 1, NULL},
	{ai_move, 1, NULL},
	{ai_move, 2, NULL},
	{ai_move, 1, gunner_footstep},
	{ai_move, 0, NULL},
	{ai_move, -2, NULL},
	{ai_move, -2, NULL},
	{ai_move, 0, gunner_footstep},
	{ai_move, 0, NULL}
};

mmove_t gunner_move_pain1 =
{
	FRAME_pain101,
	FRAME_pain118,
	gunner_frames_pain1,
	gunner_run
};

void
gunner_pain(edict_t *self, edict_t *other /* unused */,
	   	float kick /* unused */, int damage)
{
	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 (rand() & 1)
	{
		gi.sound(self, CHAN_VOICE, sound_pain, 1, ATTN_NORM, 0);
	}
	else
	{
		gi.sound(self, CHAN_VOICE, sound_pain2, 1, ATTN_NORM, 0);
	}

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

	if (damage <= 10)
	{
		self->monsterinfo.currentmove = &gunner_move_pain3;
	}
	else if (damage <= 25)
	{
		self->monsterinfo.currentmove = &gunner_move_pain2;
	}
	else
	{
		self->monsterinfo.currentmove = &gunner_move_pain1;
	}
}

void
gunner_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 gunner_frames_death[] = {
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, -7, NULL},
	{ai_move, -3, NULL},
	{ai_move, -5, NULL},
	{ai_move, 8, NULL},
	{ai_move, 6, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL},
	{ai_move, 0, NULL}
};

mmove_t gunner_move_death =
{
	FRAME_death01,
	FRAME_death11,
	gunner_frames_death,
	gunner_dead
};

void
gunner_die(edict_t *self, edict_t *inflictor /* unused */,
		edict_t *attacker /* unused */, int damage /* unused */,
		vec3_t point)
{
	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_death, 1, ATTN_NORM, 0);
	self->deadflag = DEAD_DEAD;
	self->takedamage = DAMAGE_YES;
	self->monsterinfo.currentmove = &gunner_move_death;
}

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

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

	self->monsterinfo.aiflags |= AI_DUCKED;

	if (skill->value >= SKILL_HARD)
	{
		if (random() > 0.5)
		{
			GunnerGrenade(self);
		}
	}

	self->maxs[2] -= 32;
	self->takedamage = DAMAGE_YES;
	self->monsterinfo.pausetime = level.time + 1;
	gi.linkentity(self);
}

void
gunner_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
gunner_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 gunner_frames_duck[] = {
	{ai_move, 1, gunner_duck_down},
	{ai_move, 1, NULL},
	{ai_move, 1, gunner_duck_hold},
	{ai_move, 0, NULL},
	{ai_move, -1, NULL},
	{ai_move, -1, NULL},
	{ai_move, 0, gunner_duck_up},
	{ai_move, -1, NULL}
};

mmove_t gunner_move_duck =
{
	FRAME_duck01,
	FRAME_duck08,
	gunner_frames_duck,
	gunner_run
};

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

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

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

	self->monsterinfo.currentmove = &gunner_move_duck;
}

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

	gi.sound(self, CHAN_VOICE, sound_open, 1, ATTN_IDLE, 0);
}

void
GunnerFire(edict_t *self)
{
	vec3_t start;
	vec3_t forward, right;
	vec3_t target;
	vec3_t aim;
	int flash_number;

	if (!self)
	{
		return;
	}

	flash_number = MZ2_GUNNER_MACHINEGUN_1 + (self->s.frame - FRAME_attak216);

	AngleVectors(self->s.angles, forward, right, NULL);
	G_ProjectSource(self->s.origin, monster_flash_offset[flash_number],
			forward, right, start);

	/* project enemy back a bit and target there */
	VectorCopy(self->enemy->s.origin, target);
	VectorMA(target, -0.2, self->enemy->velocity, target);
	target[2] += self->enemy->viewheight;

	VectorSubtract(target, start, aim);
	VectorNormalize(aim);
	monster_fire_bullet(self, start, aim, 3, 4, DEFAULT_BULLET_HSPREAD,
			DEFAULT_BULLET_VSPREAD, flash_number);
}

void
GunnerGrenade(edict_t *self)
{
	vec3_t start;
	vec3_t forward, right;
	vec3_t aim;
	int flash_number;

	if (!self)
	{
		return;
	}

	if (self->s.frame == FRAME_attak105)
	{
		flash_number = MZ2_GUNNER_GRENADE_1;
	}
	else if (self->s.frame == FRAME_attak108)
	{
		flash_number = MZ2_GUNNER_GRENADE_2;
	}
	else if (self->s.frame == FRAME_attak111)
	{
		flash_number = MZ2_GUNNER_GRENADE_3;
	}
	else
	{
		flash_number = MZ2_GUNNER_GRENADE_4;
	}

	AngleVectors(self->s.angles, forward, right, NULL);
	G_ProjectSource(self->s.origin, monster_flash_offset[flash_number],
			forward, right, start);

	VectorCopy(forward, aim);

	monster_fire_grenade(self, start, aim, 50, 600, flash_number);
}

static mframe_t gunner_frames_attack_chain[] = {
	{ai_charge, 0, gunner_opengun},
	{ai_charge, 0, gunner_footstep},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL}
};

mmove_t gunner_move_attack_chain =
{
	FRAME_attak209,
	FRAME_attak215,
	gunner_frames_attack_chain,
	gunner_fire_chain
};

static mframe_t gunner_frames_fire_chain[] = {
	{ai_charge, 0, GunnerFire},
	{ai_charge, 0, GunnerFire},
	{ai_charge, 0, GunnerFire},
	{ai_charge, 0, GunnerFire},
	{ai_charge, 0, GunnerFire},
	{ai_charge, 0, GunnerFire},
	{ai_charge, 0, GunnerFire},
	{ai_charge, 0, GunnerFire}
};

mmove_t gunner_move_fire_chain =
{
	FRAME_attak216,
	FRAME_attak223,
	gunner_frames_fire_chain,
	gunner_refire_chain
};

static mframe_t gunner_frames_endfire_chain[] = {
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, gunner_footstep}
};

mmove_t gunner_move_endfire_chain =
{
	FRAME_attak224,
	FRAME_attak230,
	gunner_frames_endfire_chain,
	gunner_run
};

static mframe_t gunner_frames_attack_grenade[] = {
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, GunnerGrenade},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, GunnerGrenade},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, GunnerGrenade},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, GunnerGrenade},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL},
	{ai_charge, 0, NULL}
};

mmove_t gunner_move_attack_grenade =
{
	FRAME_attak101,
	FRAME_attak121,
	gunner_frames_attack_grenade,
	gunner_run
};

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

	if (range(self, self->enemy) == RANGE_MELEE)
	{
		self->monsterinfo.currentmove = &gunner_move_attack_chain;
	}
	else
	{
		if (random() <= 0.5)
		{
			self->monsterinfo.currentmove = &gunner_move_attack_grenade;
		}
		else
		{
			self->monsterinfo.currentmove = &gunner_move_attack_chain;
		}
	}
}

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

	self->monsterinfo.currentmove = &gunner_move_fire_chain;
}

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

	if (self->enemy->health > 0)
	{
		if (visible(self, self->enemy))
		{
			if (random() <= 0.5)
			{
				self->monsterinfo.currentmove = &gunner_move_fire_chain;
				return;
			}
		}
	}

	self->monsterinfo.currentmove = &gunner_move_endfire_chain;
}

/*
 * QUAKED monster_gunner (1 .5 0) (-16 -16 -24) (16 16 32) Ambush Trigger_Spawn Sight
 */
void
SP_monster_gunner(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_death = gi.soundindex("gunner/death1.wav");
	sound_pain = gi.soundindex("gunner/gunpain2.wav");
	sound_pain2 = gi.soundindex("gunner/gunpain1.wav");
	sound_idle = gi.soundindex("gunner/gunidle1.wav");
	sound_open = gi.soundindex("gunner/gunatck1.wav");
	sound_search = gi.soundindex("gunner/gunsrch1.wav");
	sound_sight = gi.soundindex("gunner/sight1.wav");

	gi.soundindex("gunner/gunatck2.wav");
	gi.soundindex("gunner/gunatck3.wav");

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

	self->health = 175;
	self->gib_health = -70;
	self->mass = 200;

	self->pain = gunner_pain;
	self->die = gunner_die;

	self->monsterinfo.stand = gunner_stand;
	self->monsterinfo.walk = gunner_walk;
	self->monsterinfo.run = gunner_run;
	self->monsterinfo.dodge = gunner_dodge;
	self->monsterinfo.attack = gunner_attack;
	self->monsterinfo.melee = NULL;
	self->monsterinfo.sight = gunner_sight;
	self->monsterinfo.search = gunner_search;

	gi.linkentity(self);

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

	walkmonster_start(self);
}
