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const ROCK: char = '#';
const AIR: char = '.';
#[derive(Clone,PartialEq)]
struct Pos {
x: u32,
y: u32,
}
#[derive(Clone,PartialEq)]
enum RockType {
Bar,Cross,Ell,VBar,Square
}
enum Direction {
Down,Left,Right
}
#[derive(Clone,PartialEq)]
struct Rock {
rtype: RockType,
pos: Pos,
}
impl Rock {
pub fn mv(self, dir: Direction, grid: &Vec<Vec<char>>) -> Self {
// Check we _can_ move
// Then move
self
}
pub fn solidify(self, grid: &mut Vec<Vec<char>>) {
// as it says, transform squares covered by ourselves into solid rock
}
}
fn rock_height(grid: &Vec<Vec<char>>) -> usize {
0
}
fn run(input: String) {
let initial_height = 6;
let width = 7;
let rocks = vec![RockType::Bar,RockType::Cross,RockType::Ell,RockType::VBar,RockType::Square].into_iter().cycle();
let gas_jets = input.chars().cycle();
let mut grid: Vec<Vec<char>> = (0..initial_height).map(|_| {
(0..width).map(|_| {AIR}).collect()
}).collect();
let mut rock = Rock{
rtype: rocks.next().unwrap(),
pos: Pos{x: 2, y: 3}
};
let mut rocks_count: usize = 1;
'lp: loop {
let mv = match gas_jets.next().unwrap() {
'>' => Direction::Right,
'<' => Direction::Left,
dir => panic!("Unexpected jet direction! {}", dir)
};
// apply jet, ignore if it didn't move
let r2 = rock.mv(mv, &grid);
// apply gravity
let r3 = r2.mv(Direction::Down, &grid);
if rock == r3 {
// We didn't move, solidify!
rock.solidify(&mut grid);
if rocks_count == 2022 {
break 'lp;
}
// Measure height...
let max_rock = rock_height(&grid);
// Extend grid to max_rock + 7 (enough room for any new rocks)
grid.extend((0..(max_rock+7)).map(|_| { (0..width).map(|_| { AIR }).collect() }));
// Spawn new rock
rock = Rock {
rtype: rocks.next().unwrap(),
pos: Pos{x: 2, y: 3}
};
// remember how many rocks we did
rocks_count += 1;
} else {
rock = r3;
}
}
println!("Day 17: {}", rock_height(&grid));
}
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