#!/bin/sh -eu

YEAR=${YEAR:-$(date +%Y)}
DAY=${DAY:-$(TZ=EST date '+%d')}

GIT_USER=$(git config --get 'user.name')
GIT_EMAIL=$(git config --get 'user.email')

CARGO=$( sed "s/^#\(.*${DAY}\)/\1/" <"${YEAR}/rust/Cargo.toml")
echo "${CARGO}" >"${YEAR}/rust/Cargo.toml"

cd "${YEAR}/rust"
mkdir "day${DAY}" || :
cd "day${DAY}"

cargo init --bin

cat > 'Cargo.toml' << END_OF_TOML
[package]
name = "day${DAY}"
version = "0.1.0"
authors = ["${GIT_USER} <${GIT_EMAIL}>"]
edition = "2021"

[dependencies]
aoc = { path = "../../../common/rust/aoc" }
anyhow = "1.0"
END_OF_TOML

cat > 'src/main.rs' << END_OF_SRC
use {
    anyhow::{
        anyhow,
        Context,
        Result,
    },
    std::{
        env::args,
        fs::File,
        io::{
            BufRead,
            BufReader,
        },
        path::Path,
    },
};

fn read_input<T: AsRef<Path>>(filename: T) -> Result<Vec<usize>> {
    let reader = BufReader::new(File::open(filename)?);

    reader.lines().map(
        |v| {
            let s = v?;
            let n = s.parse()?;
            Ok(n)
        }
    ).collect()
}

fn part1<'a, I: IntoIterator<Item = &'a usize>>(_input: I) -> Result<usize> {
    Ok(0)
}

fn part2<'a, I: IntoIterator<Item = &'a usize>>(_input: I) -> Result<usize> {
    Ok(0)
}

fn main() -> Result<()> {
    let ( do_part_1, do_part_2 ) = aoc::do_parts();

    let filename = args().nth(1).ok_or(anyhow!("Missing input filename"))?;
    let input = read_input(filename).context("Could not read input")?;
    if do_part_1 {
        let solution = part1(&input).context("No solution for part 1")?;
        println!("Part1, solution found to be: {}", solution);
    }
    if do_part_2 {
        let solution = part2(&input).context("No solution for part 2")?;
        println!("Part2, solution found to be: {}", solution);
    }
    Ok(())
}
END_OF_SRC