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use bevy::prelude::*;
use std::fs::File;
use std::io::{BufRead, BufReader};
use std::str::FromStr;
use thiserror::Error;
fn main() {
App::build()
.add_resource(WindowDescriptor {
title: "Advent of Code".to_string(),
width: 1920,
height: 1080,
..Default::default()
})
.add_resource(ClearColor(Color::rgb(0., 0., 0.)))
.add_startup_system(setup_camera.system())
.add_startup_system(read_input_file.system())
.add_system(count_valid.system())
//.add_plugins(DefaultPlugins)
.run();
}
fn setup_camera(mut commands: Commands) {
commands.spawn(Camera2dComponents::default());
}
#[derive(Error, Debug)]
enum ValidationError {
#[error("{0}")]
FromIntError(#[from] std::num::ParseIntError),
#[error("value is out of range")]
OutOfRange,
#[error("value has an invalid unit")]
InvalidUnit,
#[error("value has an invalid characters")]
InvalidChars,
}
struct BirthYear(u32);
impl FromStr for BirthYear {
type Err = ValidationError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let num: u32 = s.parse()?;
if num >= 1920 && num <= 2002 {
Ok(Self(num))
} else {
Err(ValidationError::OutOfRange)
}
}
}
struct IssueYear(u32);
impl FromStr for IssueYear {
type Err = ValidationError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let num: u32 = s.parse()?;
if num >= 2010 && num <= 2020 {
Ok(Self(num))
} else {
Err(ValidationError::OutOfRange)
}
}
}
struct ExpirationYear(u32);
impl FromStr for ExpirationYear {
type Err = ValidationError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let num: u32 = s.parse()?;
if num >= 2020 && num <= 2030 {
Ok(Self(num))
} else {
Err(ValidationError::OutOfRange)
}
}
}
struct Height(u32);
impl FromStr for Height {
type Err = ValidationError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let inches = s.ends_with("in");
let centimeters = s.ends_with("cm");
if !inches && !centimeters {
return Err(ValidationError::InvalidUnit);
}
let num: u32 = s[0..s.len() - 2].parse()?;
let num_cm = if inches {
((num as f32) * 2.54).round() as u32
} else {
num
};
if num_cm >= 150 && num_cm <= 193 {
Ok(Self(num_cm))
} else {
Err(ValidationError::OutOfRange)
}
}
}
struct HairColor(String);
impl FromStr for HairColor {
type Err = ValidationError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
if !s.starts_with("#") {
return Err(ValidationError::InvalidChars);
}
if s.len() != 7 {
return Err(ValidationError::InvalidChars);
}
if !s
.chars()
.skip(1)
.all(|c| (c >= 'a' && c <= 'f') || c >= '0' && c <= '9')
{
return Err(ValidationError::InvalidChars);
}
Ok(Self(s.to_string()))
}
}
struct EyeColor(String);
impl FromStr for EyeColor {
type Err = ValidationError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let valid_vals = ["amb", "blu", "brn", "gry", "grn", "hzl", "oth"];
if valid_vals.contains(&s) {
Ok(Self(s.to_string()))
} else {
Err(ValidationError::InvalidChars)
}
}
}
struct PassportId(String);
impl FromStr for PassportId {
type Err = ValidationError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
if s.len() != 9 {
return Err(ValidationError::InvalidChars);
}
if !s.chars().all(|c| c.is_ascii_digit()) {
return Err(ValidationError::InvalidChars);
}
Ok(Self(s.to_string()))
}
}
struct CountryId(String);
impl FromStr for CountryId {
type Err = ValidationError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
Ok(Self(s.to_string()))
}
}
fn read_input_file(mut commands: Commands) {
let f = File::open("./inputs/day_4.txt").expect("Failed to read file");
commands.spawn(());
for line in BufReader::new(f).lines() {
let line = line.unwrap();
let line = line.trim();
if line.is_empty() {
commands.spawn(());
} else {
for section in line.split_whitespace() {
let mut section_parts = section.split(':');
let name = section_parts.next().unwrap();
let value = section_parts.next().unwrap();
match name {
"byr" => {
BirthYear::from_str(value).ok().map(|c| commands.with(c));
}
"iyr" => {
IssueYear::from_str(value).ok().map(|c| commands.with(c));
}
"eyr" => {
ExpirationYear::from_str(value)
.ok()
.map(|c| commands.with(c));
}
"hgt" => {
Height::from_str(value).ok().map(|c| commands.with(c));
}
"hcl" => {
HairColor::from_str(value).ok().map(|c| commands.with(c));
}
"ecl" => {
EyeColor::from_str(value).ok().map(|c| commands.with(c));
}
"pid" => {
PassportId::from_str(value).ok().map(|c| commands.with(c));
}
"cid" => {
CountryId::from_str(value).ok().map(|c| commands.with(c));
}
_ => {}
}
}
}
}
}
fn count_valid(
passports: Query<(
&BirthYear,
&IssueYear,
&ExpirationYear,
&Height,
&HairColor,
&EyeColor,
&PassportId,
)>,
) {
let count = passports.iter().count();
println!("There are {} valid passports", count);
}
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