#include "game.hpp"

namespace game {

world::cmodel_t unit_t::make_cmodel(v2f_t at)
{
	world::cmodel_t cmodel;

	cmodel.bounds[0] = at + size[0];
	cmodel.bounds[1] = at + size[1];
	cmodel.cflags = cflags;

	return cmodel;
}

void unit_t::compute_bounds()
{
	render_bounds[0] = x + render_size[0];
	render_bounds[1] = x + render_size[1];
}


unit_t::unit_t(unit_t::type_t type_) : entity_t(ET_UNIT)
{
	type = type_;
}

void unit_t::render_to(render::state_t *render)
{
	if (selected == selection_cookie)
		render->render_hlrect(render_bounds, sf::Color::Blue);

	if (move.moving && debug_draw_paths)
		render->debug_path(&move.path);
}

void unit_t::say(const wchar_t *wstr, double now)
{
	say_text = wstr;
	say_time = now;
	std::cout << (void*)this << ": " << wstr << "\n";
}

void unit_t::place(world::world_t *world_, v2f_t x_)
{
	world = world_;
	x = x_;
	move.moving = false;

	unlink();
	cmodel = make_cmodel(x);
	compute_bounds();
	link(world);
}

bool unit_t::keep_moving(double now, double dt, double speed)
{
	float time;

	if (!move.moving)
		return false;

	if (move.blocked && now < move.next_attempt)
		return false;

	time = dt * speed;

	while (time > 0.0f) {
		v2f_t delta, next, x_new;
		world::cmodel_t cmodel_next;

		if (!move.path.size()) {
			move.moving = false;
			break;
		}

		next = *move.path.begin();
		delta = next - x;
		move.angle = delta.angle();

		if (delta.len() >= time) {
			x_new = x + delta * time / delta.len();
			time -= delta.len();
		} else {
			x_new = next;
			time -= delta.len();
			move.path.pop_front();
		}

		cmodel_next = make_cmodel(x_new);
		if (!world->test_rect(&cmodel_next, this)) {
			x = x_new;
			cmodel = cmodel_next;
			continue;
		}

		if (move.attempts_left) {
			move.blocked = true;
			move.attempts_left--;
			move.next_attempt = now + 0.2f;
		} else {
			if ((x - move.dst).len() > 1.5f)
				say(text::unit_blocked, now);
			move.moving = false;
		}
		break;
	}

	unlink();
	compute_bounds();
	link(world);
	return true;
}

bool unit_t::start_moving(v2f_t dst_, double now)
{
	if (!world) {
		printf("unit_t::start_moving: entity is not linked\n");
		return false;
	}

	move.dst = dst_;
	move.path.clear();

	if (!world->find_path(x, move.dst, &cmodel, this, &move.path)) {
		say(text::unit_no_path, now);
		move.moving = false;
		return false;
	}

	move.moving = true;

	move.blocked = false;
	move.attempts_left = 10;
	move.next_attempt = -INFINITY;

	return true;
}

void unit_t::damage(double now, int points)
{
	health -= points;
	if (health < 0) {
		printf("%p died\n", this);
		dead = true;
		death_time = now;
		cflags = 0;
		die(now);
	}
}

human_t::human_t() : unit_t(UNIT_HUMAN)
{
	cflags = CF_HUMAN;
	health = 20;
	size[0] = v2f_t(-0.4f, -0.4f);
	size[1] = v2f_t(+0.4f, +0.4f);
	render_size[0] = v2f_t(-0.5f, -1.0f);
	render_size[1] = v2f_t(+0.5f, +0.5f);
}

void human_t::wake(double now, unit_t *by_whom)
{
}

void human_t::sleep(double now)
{
}

void human_t::think(double now, double dt)
{
	keep_moving(now, dt, 4.0);
}

void human_t::die(double now)
{
	render_size[0] = v2f_t(-0.75f, -0.5f);
	render_size[1] = v2f_t(+0.75f, +0.5f);
	unlink();
	compute_bounds();
	link(world);
}

void human_t::render_to(render::state_t *render)
{
	if (!dead) {
		bool moving;

		moving = move.moving && !move.blocked;

		render->render((moving ? &assets::human.legs_walking :
		               &assets::human.legs_idle), render_bounds, move.angle);
		render->render(&assets::human.body_idle, render_bounds, move.angle);
		render->render(&assets::human.head_idle, render_bounds, move.angle);
	} else
		render->render(&assets::human.dead, render_bounds);

	if (say_time + 5.0 > render->now) {
		v2f_t text_pos;
		float height;

		text_pos = render_bounds[0] + v2f_t(render_bounds.dim(0) / 2, -render_bounds.dim(1) * 0.1);
		height = size.dim_min() * 0.20f;
		render->render_text(text_pos, height, say_text,
				    render::ALIGN_CENTER_BOTTOM,
				    sf::Color::White);
	}

	unit_t::render_to(render);
}

alien_t::alien_t() : unit_t(UNIT_ALIEN)
{
	cflags = CF_SOLID;
	health = 4;
	size[0] = v2f_t(-0.2f, -0.2f);
	size[1] = v2f_t(+0.2f, +0.2f);
	render_size[0] = v2f_t(-0.3f, -0.3f);
	render_size[1] = v2f_t(+0.3f, +0.3f);
}

void alien_t::wake(double now, unit_t *by_whom)
{
	start_moving(by_whom->x, now);
	next_targetting = now + 0.4;
}

void alien_t::sleep(double now)
{
}

void alien_t::die(double now)
{
	
}

static unit_t *find_target(world::world_t *world, v2f_t x, float r,
                           unit_t::type_t type)
{
	rectf_t rect;
	float nearest_dist = INFINITY;
	unit_t *nearest = NULL;

	rect[0] = x - v2f_t(r, r);
	rect[1] = x + v2f_t(r, r);

	for (world::entity_t *ent : world->get_entities(rect, -1)) {
		unit_t *unit;
		float dist;

		if (ent->type != ET_UNIT)
			continue;

		unit = (unit_t*)ent;

		if (unit->type != type)
			continue;

		if (unit->dead)
			continue;

		dist = (unit->x - x).len();
		if (dist < nearest_dist) {
			nearest_dist = dist;
			nearest = unit;
		}
	}

	return nearest;
}

void alien_t::attack(double now, unit_t *target, float range)
{
	world::trace_t trace;

	if (now < next_attack)
		return;

	if ((x - target->x).len() > range)
		return;

	trace = world->trace(x, target->x, CF_SOLID);
	if (!trace.hit)
		target->damage(now, 12);

	next_attack = now + 1.0;
}

void alien_t::think(double now, double dt)
{
	if (now > next_targetting) {
		unit_t *target;

		target = find_target(world, x, 5.0f, UNIT_HUMAN);
		if (target) {
			attack(now, target, 0.75f);
			start_moving(target->x, now);
		}

		next_targetting = now + 0.2;
	}

	keep_moving(now, dt, 7.0);
}

void alien_t::render_to(render::state_t *render)
{
	bool moving;

	moving = move.moving && !move.blocked;

	render->render((moving ? &assets::alien.walking :
		       &assets::alien.idle), render_bounds, move.angle);

	unit_t::render_to(render);
}

} // namespace game