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use bevy::prelude::*;
use std::fs::File;
use std::io::{BufRead, BufReader};
fn main() {
App::build()
.add_resource(WindowDescriptor {
title: "Advent of Code".to_string(),
width: 1920,
height: 1080,
..Default::default()
})
.add_event::<AdjacentStableEvent>()
.add_event::<LineOfSightStableEvent>()
.add_resource(ClearColor(Color::rgb(0., 0., 0.)))
.add_startup_system(setup_camera.system())
.add_startup_system(read_input_file.system())
.add_system(iterate_adjacent_seats.system())
.add_system(iterate_line_of_sight_seats.system())
.add_system(report_adjacent_done.system())
.add_system(report_line_of_sight_done.system())
.add_plugins(DefaultPlugins)
.run();
}
fn setup_camera(mut commands: Commands) {
commands.spawn(Camera2dComponents::default());
}
#[derive(PartialEq, Eq, Clone, Copy)]
struct Position {
x: i32,
y: i32,
}
impl Position {
fn distance(&self, other: &Position) -> i32 {
(self.x - other.x).abs().max((self.y - other.y).abs())
}
}
impl std::ops::Add<&Position> for Position {
type Output = Position;
fn add(self, other: &Position) -> Self::Output {
Position {
x: self.x + other.x,
y: self.y + other.y,
}
}
}
struct AdjacentSeat {
occupied: bool,
}
struct LineOfSightSeat {
occupied: bool,
}
struct AdjacentStableEvent;
struct LineOfSightStableEvent;
#[derive(Default)]
struct Bounds {
min_x: i32,
max_x: i32,
min_y: i32,
max_y: i32,
}
fn read_input_file(mut commands: Commands) {
let f = File::open("./inputs/day_11.txt").unwrap();
let mut bounds = Bounds::default();
for (y, line) in BufReader::new(f).lines().enumerate() {
let line = line.unwrap();
let line = line.trim();
for (x, c) in line.chars().enumerate() {
if c == 'L' {
commands.spawn((
Position {
x: x as i32,
y: y as i32,
},
AdjacentSeat { occupied: false },
LineOfSightSeat { occupied: false },
));
}
bounds.max_x = x as i32;
}
bounds.max_y = y as i32;
}
commands.insert_resource(bounds);
}
fn iterate_adjacent_seats(
mut commands: Commands,
mut stable_events: ResMut<Events<AdjacentStableEvent>>,
seats: Query<(Entity, &Position, &AdjacentSeat)>,
) {
let mut changes: Vec<(Entity, AdjacentSeat)> = Vec::new();
for (entity, position, seat) in seats.iter() {
let surrounding_count = seats
.iter()
.filter(|(_, other_position, other_seat)| {
other_seat.occupied && position.distance(other_position) == 1
})
.count();
let change = if !seat.occupied && surrounding_count == 0 {
Some(true)
} else if seat.occupied && surrounding_count >= 4 {
Some(false)
} else {
None
};
if let Some(occupied) = change {
changes.push((entity, AdjacentSeat { occupied }));
}
}
if changes.is_empty() {
stable_events.send(AdjacentStableEvent);
}
for (entity, seat) in changes {
commands.insert_one(entity, seat);
}
}
fn iterate_line_of_sight_seats(
mut commands: Commands,
mut stable_events: ResMut<Events<LineOfSightStableEvent>>,
bounds: Res<Bounds>,
seats: Query<(Entity, &Position, &LineOfSightSeat)>,
) {
let dir_vectors = [
Position { x: -1, y: 0 },
Position { x: -1, y: -1 },
Position { x: 0, y: -1 },
Position { x: 1, y: -1 },
Position { x: 1, y: 0 },
Position { x: 1, y: 1 },
Position { x: 0, y: 1 },
Position { x: -1, y: 1 },
];
let mut changes: Vec<(Entity, LineOfSightSeat)> = Vec::new();
for (entity, position, seat) in seats.iter() {
let mut surrounding_count = 0;
for vec in dir_vectors.iter() {
let mut check = position.clone();
while check.x >= bounds.min_x
&& check.x <= bounds.max_x
&& check.y >= bounds.min_y
&& check.y <= bounds.max_y
{
check = check + vec;
if let Some((_, _, other_seat)) =
seats.iter().find(|(_, other_pos, _)| other_pos == &&check)
{
if other_seat.occupied {
surrounding_count += 1;
}
break;
}
}
}
let change = if !seat.occupied && surrounding_count == 0 {
Some(true)
} else if seat.occupied && surrounding_count >= 5 {
Some(false)
} else {
None
};
if let Some(occupied) = change {
changes.push((entity, LineOfSightSeat { occupied }));
}
}
if changes.is_empty() {
stable_events.send(LineOfSightStableEvent);
}
for (entity, seat) in changes {
commands.insert_one(entity, seat);
}
}
fn report_adjacent_done(
stable_events: Res<Events<AdjacentStableEvent>>,
mut stable_event_reader: Local<EventReader<AdjacentStableEvent>>,
seats: Query<&AdjacentSeat>,
) {
for _ in stable_event_reader.iter(&stable_events) {
let occupied = seats.iter().filter(|s| s.occupied).count();
println!("{} seats end up occupied in the adjacent model", occupied);
}
}
fn report_line_of_sight_done(
stable_events: Res<Events<LineOfSightStableEvent>>,
mut stable_event_reader: Local<EventReader<LineOfSightStableEvent>>,
seats: Query<&LineOfSightSeat>,
) {
for _ in stable_event_reader.iter(&stable_events) {
let occupied = seats.iter().filter(|s| s.occupied).count();
println!(
"{} seats end up occupied in the line of sight model",
occupied
);
}
}
|
