/// https://github.com/image-rs/image#generating-fractals

fn main() {
  let imgx = 800;
  let imgy = 800;

  let scalex = 3.0 / imgx as f32;
  let scaley = 3.0 / imgy as f32;

  // Create a new ImgBuf with width: imgx and height: imgy
  let mut imgbuf = image::ImageBuffer::new(imgx, imgy);

  // Iterate over the coordinates and pixels of the image
  for (x, y, pixel) in imgbuf.enumerate_pixels_mut() {
    let r = (0.3 * x as f32) as u8;
    let b = (0.3 * y as f32) as u8;
    *pixel = image::Rgba([r, 0, b, 255]);
  }

  let center_x = imgx as f32 / 2.0;
  let center_y = imgy as f32 / 2.0;

  // A redundant loop to demonstrate reading image data
  for x in 0..imgx {
    for y in 0..imgy {
      let cx = y as f32 * scalex - 1.5;
      let cy = x as f32 * scaley - 1.5;

      let c = num_complex::Complex::new(-0.4, 0.6);
      let mut z = num_complex::Complex::new(cx, cy);

      let mut i = 0;
      while i < 255 && z.norm() <= 2.0 {
        z = z * z + c;
        i += 1;
      }

      let pixel = imgbuf.get_pixel_mut(x, y);
      let image::Rgba(data) = *pixel;
      *pixel = image::Rgba([
        data[0],
        i as u8,
        data[2],
        if f32::hypot(x as f32 - center_x, y as f32 - center_y) < 360.0 {
          255
        } else {
          0
        },
      ]);
    }
  }

  let dynamic_image = image::DynamicImage::ImageRgba8(imgbuf);
  let favicon = dynamic_image.resize(400, 400, image::imageops::FilterType::Lanczos3);
  favicon.save("website/public/img/favicon.png").unwrap();
  let favicon16 = dynamic_image.resize(16, 16, image::imageops::FilterType::Lanczos3);
  favicon16
    .save("website/public/img/favicon-16x16.png")
    .unwrap();
  let favicon32 = dynamic_image.resize(32, 32, image::imageops::FilterType::Lanczos3);
  favicon32
    .save("website/public/img/favicon-32x32.png")
    .unwrap();
  let favicon160 = dynamic_image.resize(160, 160, image::imageops::FilterType::Lanczos3);
  favicon160
    .save("website/public/img/apple-touch-icon.png")
    .unwrap();
}