//! # Advent of Code
//!
//! > **Advent of Code solutions in Rust.**

#![forbid(unsafe_code)]

use std::{fs::read_to_string, path::PathBuf};

use {askama::Template, clap::Parser, color_eyre::Result};

use crate::utilities::{get_solutions, session_cookie, write_file};

pub mod prelude;
pub mod solution;
pub mod templates;
pub mod utilities;
pub mod year_2021;

#[derive(Debug, Parser)]
#[clap(about, author, version)]
pub struct Args {
  /// Filter to only a specific year and/or day, in `YEAR::DAY` format.
  pub filter: Option<String>,
}

pub fn main() -> Result<()> {
  color_eyre::install()?;

  let args = Args::parse();
  let filter = args.filter.unwrap_or_default();
  let session_cookie = session_cookie()?;
  let mut years = vec![];

  for year in get_solutions() {
    let mut solutions = vec![];

    for solution in year {
      if !solution.day.filter_string().starts_with(&filter) {
        continue;
      }

      let year = solution.day.year;
      let day = solution.day.day;

      let data_path = PathBuf::from(format!("aoc/{year}/{day:02}.txt"));
      let data = if !data_path.exists() {
        println!("{data_path:?} doesn't exist, downloading");
        std::thread::sleep(std::time::Duration::from_secs(1));
        write_file(
          data_path,
          ureq::get(&format!(
            "https://adventofcode.com/{year}/day/{day}/input"
          ))
          .set("Cookie", &session_cookie)
          .call()?
          .into_string()?,
        )?
      } else {
        read_to_string(data_path)?
      };

      solutions.push(solution.solve(data.trim())?);
    }

    years.append(&mut vec![solutions]);
  }

  write_file(
    "aoc/solutions.html".into(),
    templates::SolutionsTemplate { years }.render()?,
  )?;
  Ok(())
}