use ccvl::image::*;

pub fn process_image<F>(f: F) -> std::process::ExitCode
where
    F: FnOnce(Image<SRGBA>) -> Image<SRGBA>,
{
    let args = std::env::args().collect::<Vec<String>>();
    if args.len() != 3 {
        println!("Usage: {} IN OUT", args[0].as_str());
        return std::process::ExitCode::FAILURE;
    }

    let input_path = args[1].as_str();
    let output_path = args[2].as_str();

    match Image::load::<Farbfeld>(input_path) {
        Err(Error::Invalid) => {
            println!("{} is not a valid image", input_path);
            std::process::ExitCode::FAILURE
        }
        Err(Error::Io(err)) => {
            println!("I/O error loading image {}: {}", input_path, err);
            std::process::ExitCode::FAILURE
        }
        Ok(img) => match f(img).save::<Farbfeld>(output_path) {
            Err(err) => {
                println!("I/O error saving image {}: {}", output_path, err);
                std::process::ExitCode::FAILURE
            }
            Ok(()) => std::process::ExitCode::SUCCESS,
        },
    }
}