mod common;

use ccvl::*;

const OUTER: image::SRGBA = image::SRGBA {
    r: 0.0,
    g: 1.0,
    b: 0.0,
    a: 1.0,
};
const INNER: image::SRGBA = image::SRGBA {
    r: 0.0,
    g: 0.0,
    b: 1.0,
    a: 1.0,
};

fn draw(contour: &contour::Contour, img: &mut image::Image<image::SRGBA>) {
    let n = contour.vertices.len();
    for i in 0..n {
        let (x0, y0) = contour.vertices[i];
        let (x1, y1) = contour.vertices[(i + 1) % n];
        let colour = match contour.kind {
            contour::Kind::Outer => OUTER,
            contour::Kind::Inner => INNER,
        };
        draw::line(x0, y0, x1, y1, img, colour);
    }
}

fn main() -> std::process::ExitCode {
    common::process_image(|mut img| {
        let greyscale = img.map(|p| image::Luminance::from(p));
        let thresholded = filter::threshold_auto(greyscale);

        let contours = contour::find(thresholded);
        for contour in contours {
            draw(&contour, &mut img);
        }

        img
    })
}