use std::path::PathBuf;

/// Convert an image to the Nord color palette without dithering artifacts.
#[derive(argh::FromArgs)]
struct Args {
    /// input image path
    #[argh(positional)]
    input: PathBuf,

    /// output image path
    #[argh(option, short = 'o')]
    output: PathBuf,

    /// use only the original 16 Nord colors (disable palette expansion)
    #[argh(switch)]
    no_expand: bool,

    /// number of interpolated colors between close palette entries (default: 3)
    #[argh(option, default = "3")]
    expansion_factor: usize,

    /// use plain RGB distance instead of perceptual LAB distance
    #[argh(switch)]
    rgb_distance: bool,
}

fn main() -> std::process::ExitCode {
    let args: Args = argh::from_env();
    let options = nordify_rs::NordifyOptions {
        expand: !args.no_expand,
        expansion_factor: args.expansion_factor,
        use_lab: !args.rgb_distance,
    };

    match nordify_rs::nordify_file(&args.input, &args.output, &options) {
        Ok(()) => {
            println!("Saved to {}", args.output.display());
            std::process::ExitCode::SUCCESS
        }
        Err(err) => {
            eprintln!("Error: {err}");
            std::process::ExitCode::FAILURE
        }
    }
}