//! # Day 5: Supply Stacks

use std::collections::VecDeque;

fn extract_crates_in_layer(layer: &str, piles_number: usize) -> Vec<char> {
    let mut crates: Vec<char> = Vec::with_capacity(piles_number);
    for i in 0..piles_number {
        let crate_name_idx: usize = i * 4 + 1;
        let crate_name: char = layer.chars().nth(crate_name_idx).unwrap();
        crates[i] = crate_name;
    }
    crates
}

fn parse_crates_piles(entrepot: &str) -> Vec<VecDeque<char>> {
    let mut piles: Vec<VecDeque<char>> = Vec::new();
    let mut number_of_piles: usize = 0;
    let mut entrepot_layers = entrepot.lines();
    let last_line = entrepot_layers.nth_back(0);
    let piles_number: usize = (last_line.expect("reason").len() + 1) / 4 as usize;
    for pile_idx in 0..piles_number {
        piles[pile_idx] = VecDeque::new();
    }
    let j = 0;
    let number_of_layers: usize = entrepot_layers.clone().count();
    for layer in entrepot_layers {
        if j != number_of_layers - 1 {
            // Not the last line
            let crates = extract_crates_in_layer(layer, piles_number);
            // Enqueue below the pile
            for pile_idx in 0..crates.len() {
                piles[pile_idx].push_back(crates[pile_idx]);
            }
        }
    }
    piles
}

fn main() {
    let input_file = "../data/sample.txt";
}