/*
Copyright (C) 2015-2016 Parallel Realities

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.

*/

#include "jumpgate.h"

static void think(void);
static void draw(void);
static void handleFleeingEntities(void);
static void addEscapeEffect(Entity *ent);

static SDL_Texture *portal;
static float portalAngle;

Entity *spawnJumpgate(void)
{
	Entity *jumpgate = spawnEntity();

	jumpgate->type = ET_JUMPGATE;
	jumpgate->health = jumpgate->maxHealth = FPS;
	jumpgate->texture = getTexture("gfx/entities/jumpgate.png");
	jumpgate->action = think;
	jumpgate->draw = draw;
	jumpgate->flags |= EF_NO_MT_BOX;

	portal = getTexture("gfx/entities/portal.png");
	portalAngle = 0;
	
	SDL_QueryTexture(jumpgate->texture, NULL, NULL, &jumpgate->w, &jumpgate->h);

	return jumpgate;
}

int jumpgateEnabled(void)
{
	return (battle.jumpgate && (!(battle.jumpgate->flags & EF_DISABLED)));
}

void activateJumpgate(int activate)
{
	if (battle.jumpgate)
	{
		if (activate)
		{
			battle.jumpgate->flags &= ~EF_DISABLED;
		}
		else
		{
			battle.jumpgate->flags |= EF_DISABLED;
		}
	}
}

static void think(void)
{
	self->thinkTime = 4;

	self->angle += 0.1;
	if (self->angle >= 360)
	{
		self->angle -= 360;
	}

	if (jumpgateEnabled())
	{
		handleFleeingEntities();
	}

	if (!battle.jumpgate)
	{
		battle.jumpgate = self;
	}

	if (battle.jumpgate == self)
	{
		portalAngle += 2;
		if (portalAngle >= 360)
		{
			portalAngle -= 360;
		}
	}
}

static void handleFleeingEntities(void)
{
	Entity *e, **candidates;
	int i;

	candidates = getAllEntsWithin(self->x - (self->w / 2), self->y - (self->h / 2), self->w, self->h, self);

	for (i = 0, e = candidates[i] ; e != NULL ; e = candidates[++i])
	{
		if (e->health > 0 && e->flags & EF_RETREATING && getDistance(self->x, self->y, e->x, e->y) <= 255)
		{
			e->alive = ALIVE_ESCAPED;

			addEscapeEffect(e);

			playBattleSound(SND_JUMP, e->x, e->y);
		}
	}
}

static void addEscapeEffect(Entity *ent)
{
	Effect *e;
	int i, n, speed;

	n = ent->w * ent->h;

	for (i = 0 ; i < n ; i++)
	{
		e = malloc(sizeof(Effect));
		memset(e, 0, sizeof(Effect));
		battle.effectTail->next = e;
		battle.effectTail = e;

		speed = 50 + rand() % 50;

		e->type = EFFECT_POINT;
		e->x = ent->x + (rand() % ent->w) - (rand() % ent->w);
		e->y = ent->y + (rand() % ent->h) - (rand() % ent->w);

		e->dx = self->x - e->x;
		e->dx /= speed;

		e->dy = self->y - e->y;
		e->dy /= speed;

		e->r = e->g = e->b = e->a = (rand() % 255);
		e->health = speed;
	}
}

static void draw(void)
{
	if (jumpgateEnabled())
	{
		blitRotated(portal, self->x - battle.camera.x, self->y - battle.camera.y, portalAngle);
	}

	blitRotated(self->texture, self->x - battle.camera.x, self->y - battle.camera.y, self->angle);
}