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

use anyhow::Result;
use clap::{Parser, ValueEnum};
use turbulence::generate_turbulence;

use crate::value_noise::generate_noise;

mod ppm;
mod turbulence;
mod value_noise;
mod vec2;

#[derive(Parser)]
struct Opt {
  #[clap(long = "algorithm", default_value = "turbulence")]
  algorithm: Algorithm,

  #[clap(long = "size", default_value = "1024")]
  size: usize,

  #[clap(short = 'o', long = "out", default_value = "out.ppm")]
  output_path: PathBuf,
}

#[derive(ValueEnum, Clone)]
enum Algorithm {
  Noise,
  Turbulence,
}

fn main() -> Result<()> {
  let opt = Opt::parse();

  let rng = rand::thread_rng();

  let ppm = match opt.algorithm {
    Algorithm::Noise => generate_noise(opt.size, opt.size, rng),
    Algorithm::Turbulence => generate_turbulence(opt.size, opt.size, rng),
  };

  {
    let file = File::create(opt.output_path)?;
    ppm.write(file)?;
  }

  Ok(())
}