pub fn set_panic_hook() {
    // When the `console_error_panic_hook` feature is enabled, we can call the
    // `set_panic_hook` function at least once during initialization, and then
    // we will get better error messages if our code ever panics.
    //
    // For more details see
    // https://github.com/rustwasm/console_error_panic_hook#readme
    #[cfg(feature = "console_error_panic_hook")]
    console_error_panic_hook::set_once();
}

/// this is total extra, so it the planet viewbox is like 100px wide, it will now be in total 110 pixels wide
static VIEWBOX_SCALE: f32 = 0.1;

pub static COLORS: [[f32; 3]; 10] = [
    [0.5, 0.5, 0.5],
    [1.0, 0.50, 0.0],   // #FF8000
    [0.0, 0.50, 1.0],   // #0080ff
    [1.0, 0.4, 0.58],   // #FF6693
    [0.24, 0.79, 0.33], // #3fcb55
    [0.79, 0.76, 0.24], // #cbc33f
    [0.81, 0.25, 0.91], // #cf40e9
    [0.94, 0.32, 0.32], // #FF3F0D
    [0.11, 0.93, 0.94], // #1beef0
    [0.05, 0.77, 1.0],  // #0DC5FF
];

use super::types;

pub fn caclulate_viewbox(planets: &Vec<types::Planet>) -> Vec<f32> {
    let mut iter = planets.iter();

    let init = match iter.next() {
        Some(p) => (p.x, p.y, p.x, p.y),
        None => return vec![0.0, 0.0, 0.0, 0.0],
    };
    let (min_x, min_y, max_x, max_y) =
        planets
            .iter()
            .fold(init, |(min_x, min_y, max_x, max_y), p| {
                (
                    min_x.min(p.x),
                    min_y.min(p.y),
                    max_x.max(p.x),
                    max_y.max(p.y),
                )
            });

    let (width, height) = (max_x - min_x, max_y - min_y);
    let (dx, dy) = (
        (VIEWBOX_SCALE * width).max(6.0),
        (VIEWBOX_SCALE * height).max(6.0),
    );

    vec![min_x - dx / 2.0, min_y - dy / 2.0, width + dx, height + dy]
}

pub fn get_planets(planets: &Vec<types::Planet>, r: f32) -> Vec<f32> {
    planets.iter().fold(Vec::new(), |mut cum, p| {
        cum.push(p.x);
        cum.push(p.y);
        cum.push(r);
        cum
    })
}