/*
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)
{
	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 (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)
{
	say_text = str;
	say_time = game->now;
	game->interface->print(name + ": " + str);
}

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

	if (!move.moving)
		return true;

	if (move.blocked && game->now < move.next_attempt)
		return true;

	time = game->dt * speed;
	move.blocked = true;

	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)) {
			x = x_new;
			cmodel.bounds = test_cmodel.bounds;
			move.blocked = false;
			continue;
		}

		if (move.attempts_left) {
			move.attempts_left--;
			move.next_attempt = game->now + 0.2f;
		} else {
			if ((x - move.dst).len() > 1.5f)
				rv = false;
			move.moving = false;
		}
		break;
	}

	place(world, x);
	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();

	rep.cflags = move.cflags & ~(cmodel.cflags);
	rep.bounds = cmodel.bounds;

	if (!world->find_path(x, move.dst, &rep, this, &move.path)) {
		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(int points, unit_t *attacker)
{
	fx_blood_t *blood;

	blood = new fx_blood_t(game, x, type == UNIT_SPIDER);
	blood->place(&game->world);

	health -= points;
	if (health <= 0)
		die(attacker);
}

void unit_t::die(unit_t *killer)
{
	game->interface->print(name + " " + text::get(text::UNIT_DEATH) + ".");

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

	sleep();
	ignore_waking = true;

	on_death();
}

void unit_t::try_attack(unit_t *target)
{
	std::stringstream ss;
	size_t hit_roll;
	size_t dmg_roll;

	ss << name << " " << text::get(text::UNIT_ATTACK) << " " << target->name << ": ";

	hit_roll = game->roll(die_t(20));
	ss << hit_roll << " vs " << target->cs.armor_class;

	if (hit_roll == 1 || hit_roll < target->cs.armor_class) {
		ss << " (" << text::get((hit_roll == 1 ? text::UNIT_CRITICAL_MISS : text::UNIT_MISS)) << ")";
		game->interface->print(ss.str());
		return;
	}

	dmg_roll = game->roll(cs.hit_die);

	if (hit_roll < 20) {
		ss << ", " << text::get(text::UNIT_DAMAGE) << ": ";
		ss << dmg_roll - cs.hit_die.bonus << " + " << cs.hit_die.bonus << " = " << dmg_roll;
	} else {
		ss << " (" << text::get(text::UNIT_CRITICAL_HIT) << ")" << ", " << text::get(text::UNIT_DAMAGE) << ": ";
		ss << "(" << dmg_roll - cs.hit_die.bonus << " + " << cs.hit_die.bonus << ") x 2 = " << dmg_roll * 2;
		dmg_roll *= 2;
	}

	game->interface->print(ss.str());
	target->damage(dmg_roll, this);
}

static 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;
}

unit_soldier_t::unit_soldier_t(game::state_t *game) : unit_t(game, UNIT_SOLDIER)
{
	size[0] = v2f_t(-0.3f, +0.0f);
	size[1] = v2f_t(+0.3f, +0.3f);
	render_size[0] = v2f_t(-0.5f, -1.2f);
	render_size[1] = v2f_t(+0.5f, +0.3f);
	cmodel.cflags = CF_BODY;
	move.cflags = CF_SOLID | CF_BODY | CF_WATER;

	name = text::get(text::UNIT_NAME_SOLDIER);

	wake();
	friendly = true;
	controllable = true;

	health = max_health = 20;
	cs.armor_class = 10;
	cs.hit_die = die_t(8);
}

void unit_soldier_t::check_area(void)
{
	rectf_t bounds;

	bounds[0] = x - v2f_t(10, 10);
	bounds[1] = x + v2f_t(10, 10);

	willpower_bonus = 0;
	fear_dc = 0;

	for (world::entity_t *went : game->world.get_entities(bounds, -1)) {
		auto ent = dynamic_cast<game::entity_t*>(went);
		unit_t *unit;

		// WTF?
		if (!ent)
			continue;

		if (ent == this)
			continue;

		// Wake everything around.
		if (!ent->ignore_waking) {
			ent->wake_time = game->now;

			if (!ent->awake)
				ent->wake();
		}

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

		unit = (unit_t*)ent;

		if (unit->dead)
			continue;

		if (unit->friendly)
			willpower_bonus += 6;
		else {
			if (unit->type == UNIT_NEST)
				fear_dc += 6;
			else
				fear_dc += 4;
		}
	}
}

void unit_soldier_t::target_and_attack(void)
{
	unit_t *target;
	world::trace_t trace;
	fx_tracer_t *tracer;

	if (game->now < next_targetting)
		return;

	next_targetting = game->now + 0.2;

	target = find_target(world, x, 10.0f, false);
	if (!target)
		return;

	last_target_time = game->now;
	last_target_x = target->x;

	if (last_attack + 1.5 > game->now)
		return;

	trace = world->trace(x, target->x, CF_SOLID);
	if (trace.hit)
		return;

	tracer = new fx_tracer_t(game, x, target->x);
	tracer->place(&game->world);

	last_attack = game->now;
	try_attack(target);
}

void unit_soldier_t::on_think(void)
{
	check_area();

	if (panic && game->now > panic_end) {
		move.moving = false;
		move.path.clear();
		panic = false;
		controllable = true;
	}

	if (health == max_health)
		willpower_bonus += 3;
	else if (fear_dc > 1 && health < max_health / 2)
		fear_dc += 3;

	if (!panic && fear_dc > 1 && game->now > next_fear_test) {
		size_t roll;
		bool success;
		std::stringstream ss;

		roll = game->roll(die_t(20));
		success = roll + willpower_bonus >= fear_dc;

		ss << name << " " << text::get(text::UNIT_SAVING_THROW_WILLPOWER);
		ss << ": " << roll << " + " << willpower_bonus << " = " << roll + willpower_bonus;
		ss << " vs " << fear_dc << ": ";

		if (success)
			ss << text::get(text::UNIT_SAVING_THROW_SUCCESS);
		else
			ss << text::get(text::UNIT_SAVING_THROW_FAILURE);

		game->interface->print(ss.str());

		if (!success) {
			say(text::get(text::SAY_PANIC));
			panic = true;
			panic_end = game->now + 10;
			panic_turn = -INFINITY;
			controllable = false;
		}
		
		next_fear_test = game->now + 3;
	}

	if (!panic) {
		target_and_attack();

		if (!keep_moving(4.0))
			say(text::get(text::SAY_BLOCKED));
	} else {
		move.moving = true;
		keep_moving(6.0);

		if (game->now >= panic_turn) {
			v2f_t t;

			t = game->dice_prng.unit_vec2();

			move.path.clear();
			move.path.push_back(x + t * 10);
			panic_turn = game->now + 0.3;
		}
	}
}

void unit_soldier_t::on_death(void)
{
	render_size[0] = v2f_t(-0.75f, -0.5f);
	render_size[1] = v2f_t(+0.75f, +0.5f);
	render_layer = -1;
	cmodel.cflags = CF_BACKGROUND;
	place(world, x);
	controllable = false;
	game->selected_units.erase(this);
}

void unit_soldier_t::render_to(render::state_t *render)
{
	sf::Color selection_color;

	if (selected == selection_cookie) {
		if (health == max_health)
			selection_color = sf::Color::Green;
		else if (health >= max_health / 2)
			selection_color = sf::Color::Yellow;
		else if (dead)
			selection_color = sf::Color::Black;
		else
			selection_color = sf::Color::Red;

		if (panic && (game->now - floor(game->now) > 0.5))
			selection_color = sf::Color::Blue;

		render->render(0.0, &assets::unit_selected, cmodel.bounds, selection_color);
	}

	if (!dead) {
		render::oriented_sprite_t *legs, *body;
		float body_angle;

		if (move.moving && !move.blocked)
			legs = &assets::soldier.legs_walking;
		else
			legs = &assets::soldier.legs_idle;

		if (!panic && last_target_time + 3 > game->now) {
			if (last_attack + 0.1 > game->now)
				body = &assets::soldier.body_firing;
			else
				body = &assets::soldier.body_aiming;

			body_angle = (last_target_x - x).angle();

		} else {
			body = &assets::soldier.body_idle;
			body_angle = move.angle;
		}

		render->render(game->now * 10, legs, render_bounds, move.angle);

		if (panic)
			render->render(game->now * 10, &assets::soldier.body_panic, render_bounds);
		else
			render->render(game->now * 10, body, render_bounds, body_angle);

		render->render(game->now * 10, &assets::soldier.head_idle, render_bounds, body_angle);
	} else
		render->render(game->now * 10, &assets::soldier.dead, render_bounds);

	unit_t::render_to(render);
}

void unit_soldier_t::render_late_to(render::state_t *render)
{
	if (selected == selection_cookie)
		render->render(0.0, &assets::unit_selected_halo, cmodel.bounds, selection_color);
}

unit_spider_t::unit_spider_t(game::state_t *game) : unit_t(game, UNIT_SPIDER)
{
	size[0] = v2f_t(-0.2f, +0.0f);
	size[1] = v2f_t(+0.2f, +0.3f);
	render_size[0] = v2f_t(-0.3f, -0.3f);
	render_size[1] = v2f_t(+0.3f, +0.3f);
	cmodel.cflags = CF_BODY_SMALL;
	move.cflags = CF_SOLID | CF_WATER | CF_BODY_SMALL;

	name = text::get(text::UNIT_NAME_SPIDER);

	ignore_waking = false;

	health = max_health = 4;
	cs.armor_class = 15;
	cs.hit_die = die_t(3, 6);
}

void unit_spider_t::target_and_attack(void)
{
	unit_t *target;
	world::trace_t trace;

	if (game->now < next_targetting)
		return;

	target = find_target(world, x, 10.0f, true);
	if (!target)
		return;

	start_moving(target->x);
	next_targetting = game->now + 0.2;

	if (last_attack + 0.5 > game->now)
		return;

	if ((x - target->x).len() >= 1.0f)
		return;

	trace = world->trace(x, target->x, CF_SOLID);
	if (trace.hit)
		return;

	try_attack(target);
	last_attack = game->now;
}

void unit_spider_t::on_think(void)
{
	target_and_attack();

	keep_moving(7.0);

	if (!move.moving && wake_time + 5 < game->now)
		sleep();
}

void unit_spider_t::on_wake(void)
{
	next_targetting = game->now;
}

void unit_spider_t::on_death(void)
{
	render_layer = -1;
	cmodel.cflags = CF_BACKGROUND;
}

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

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

	if (!dead)
		render->render(game->now * 20, (moving ? &assets::spider.walking :
		               &assets::spider.idle), render_bounds, move.angle);
	else
		render->render(game->now * 20, &assets::spider.dead, render_bounds);

	unit_t::render_to(render);
}

unit_nest_t::unit_nest_t(game::state_t *game_) : unit_t(game_, UNIT_NEST)
{
	size[0] = {-0.6f, +0.2f};
	size[1] = {+0.6f, +0.6f};
	render_size[0] = {-0.6f, -0.6f};
	render_size[1] = {+0.6f, +0.6f};
	cmodel.cflags = CF_BACKGROUND;

	name = text::get(text::UNIT_NAME_NEST);

	ignore_waking = false;

	health = max_health = 45;
	cs.armor_class = 5;

	next_spawning = game->now + 5.0;
}

void spawn_spider(game::state_t *game, v2f_t nest)
{
	for (size_t i = 0; i < 5; i++) { // Try a few times before giving up.
		v2f_t offset, x;
		world::cmodel_t cmodel;
		unit_spider_t *spider;
	
		offset = game->dice_prng.unit_vec2();
		x = nest + offset * (game->dice_prng.next_float() * 0.2 + 0.4);

		cmodel.bounds = rectf_t(v2f_t(-0.5f, -0.5f), v2f_t(0.5f, 0.5f)) + x;
		cmodel.cflags = CF_SOLID | CF_WATER | CF_BODY_SMALL;
		if (game->world.test_rect(&cmodel, NULL))
			continue;

		spider = new unit_spider_t(game);
		spider->place(&game->world, x);
		return;
	}
}

void unit_nest_t::on_think(void)
{
	if (wake_time + 30 > game->now)
		sleep();

	if (next_spawning > game->now)
		return;

	spawn_spider(game, x);
	next_spawning = game->now + game->dice_prng.next_float() * 10 + 5;
}

void unit_nest_t::on_spawn(void)
{
	spawn_spider(game, x);
	spawn_spider(game, x);
	spawn_spider(game, x);
}

void unit_nest_t::on_death(void)
{
	render_layer = -1;
	cmodel.cflags = CF_BACKGROUND;
}

void unit_nest_t::render_to(render::state_t *render)
{
	if (!dead)
		render->render(game->now, &assets::nest.idle, render_bounds);
	else
		render->render(game->now, &assets::nest.dead, render_bounds);

	unit_t::render_to(render);
}

} // namespace game