/*
This file is part of Minitrem.

Minitrem 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.

Minitrem 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 Minitrem.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "game.hpp"

namespace game {

unit_t::unit_t(game::state_t *game_, unit_t::type_t type_) : game::entity_t(game_, ET_UNIT)
{
	game = game_;
	type = type_;
}

void unit_t::render_to(render::state_t *render)
{
	if (!dead && health < max_health)
	{
		rectf_t bar;
		float frac;
		sf::Color color;

		bar[0][0] = (render_bounds[0][0] + render_bounds[1][0]) / 2;
		bar[0][1] = render_bounds[0][1] - 0.05f;
		bar[0][0] -= 0.3f;
		bar[1][0] = bar[0][0] + 0.6f;
		bar[1][1] = bar[0][1] + 0.05f;
		render->render_rect(bar, sf::Color::Black);

		frac = (float)health / max_health;

		if (frac < 0.3f)
			color = sf::Color::Red;
		else if (frac < 0.75f)
			color = sf::Color::Yellow;
		else
			color = sf::Color::Green;

		bar[1][0] = lerp(bar[0][0], bar[1][0], frac);
		render->render_rect(bar, color);
	}

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

	if (!dead && say_time + 5.0 > game->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() * 0.50f;
		render->render_text(text_pos, height, say_text,
				    render::ALIGN_CENTER_BOTTOM,
				    sf::Color::White);
	}

	if (selected == selection_cookie && type != UNIT_SOLDIER)
		render->render_hlrect(render_bounds, sf::Color::Green);

	if (debug_AI) {
		v2f_t text_pos;
		float height;
		std::stringstream ss;

		if (dead)
			ss << "D";

		if (awake)
			ss << "A";
		else
			ss << "S";

		if (controllable)
			ss << "C";

		text_pos = render_bounds[0] + v2f_t(render_bounds.dim(0) / 2, -render_bounds.dim(1) * 0.1);
		height = size.dim_min() * 0.40f;
		text_pos[1] -= height;
		render->render_text(text_pos, height, ss.str(),
				    render::ALIGN_CENTER_BOTTOM,
				    sf::Color::White);
	}
}

void unit_t::say(std::string str, bool on_interface)
{
	say_text = str;
	say_time = game->now;

	if (on_interface)
		game->interface->print(name + ": " + str);
}

bool unit_t::keep_moving(double speed)
{
	float time;
	bool rv = true;

	if (!move.moving)
		return true;

	time = game->dt * speed;

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

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

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

		if (delta.len() != 0.0f)
			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();
		}

		test_cmodel.bounds = size + x_new;
		test_cmodel.cflags = move.cflags;
		if (world->test_rect(&test_cmodel, this)) {
			rv = false;
			break;
		}

		x = x_new;
		cmodel.bounds = test_cmodel.bounds;
	}

	place(world, x);
	move.blocked = !rv;
	return rv;
}

bool unit_t::start_moving(v2f_t dst)
{
	world::cmodel_t rep;

	if (!world) {
		printf("unit_t::start_moving: entity is not linked\n");
		return false;
	}

	move.dst = dst;
	move.path.clear();
	move.last_step = x;

	rep.cflags = move.cflags;
	rep.bounds = cmodel.bounds;

	if (!world->find_path(x, move.dst, &rep, this, &move.path)) {
		move.moving = false;
		return false;
	}

	move.moving = true;
	return true;
}

void unit_t::stop_moving(void)
{
	move.path.clear();
	move.moving = false;
}

void unit_t::damage(int points, unit_t *attacker)
{
	fx_blood_t *blood;
	bool alien;

	health -= points;
	if (health <= 0)
		die(attacker);
	else {
		wake();
		on_damage(attacker);
	}

	switch (type) {
	case UNIT_SOLDIER:
		alien = false;
		break;

	case UNIT_SPIDER:
	case UNIT_NEST:
		alien = true;
		break;

	default:
		return;
	}

	blood = new fx_blood_t(game, x, alien);
	blood->place(&game->world);
}

void unit_t::die(unit_t *killer)
{
	switch (type) {
	case UNIT_SOLDIER:
	case UNIT_SPIDER:
		game->interface->print(name + " " + text::get(text::UNIT_DEATH) + ".");
		break;

	default:
		game->interface->print(name + " " + text::get(text::UNIT_DESTRUCTION) + ".");
		break;
	}

	dead = true;
	death_time = game->now;
	cmodel.cflags = 0;
	move.path.clear();

	sleep();
	ignore_waking = true;

	on_death();
}

unit_t *find_target(world::world_t *world, v2f_t x, float r,
                           bool friendly)
{
	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->friendly != friendly)
			continue;

		if (unit->dead)
			continue;

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

	return nearest;
}

void unit_t::random_walk(void)
{
	if (move.random_walk_time &&
	    game->time - move.random_walk_time < MSEC(1000))
		return;

	move.moving = true;
	move.blocked = false;
	move.dst = x + game->prng.unit_vec2() * 10;
	move.path.clear();
	move.path.push_back(move.dst);
	move.random_walk_time = game->time;
}

void state_t::hivemind_alert(v2f_t x, float r, bool do_move, v2f_t move_to)
{
	rectf_t search;
	std::list<world::entity_t*> ents;

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

	ents = world.get_entities(search, CF_BODY_SMALL);

	for (world::entity_t *ent : ents) {
		unit_t *unit;

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

		unit = dynamic_cast<unit_t*>(ent);

		if ((unit->x - x).len() > r)
			continue;

		if (unit->type != unit_t::UNIT_SPIDER)
			continue;

		if (unit->have_target)
			continue;

		unit->wake();

		if (!do_move)
			continue;

		// Move towards the target if it's close, otherwise walk
		// randomly to avoid fire.
		if ((unit->x - move_to).len() > 25.0f)
			continue;

		unit->start_moving(move_to);
	}

	if (debug_AI) {
		fx_debug_hivemind_t *debug;

		debug = new fx_debug_hivemind_t(this, x, r, do_move, move_to);
		debug->place(&world);
	}
}

} // namespace game