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use wasm_bindgen::closure::Closure;
use wasm_bindgen::JsCast;
use web_sys;

pub fn window() -> web_sys::Window {
    web_sys::window().expect("no global `window` exists")
}

pub fn request_animation_frame(f: &Closure<FnMut()>) {
    window()
        .request_animation_frame(f.as_ref().unchecked_ref())
        .expect("should register `requestAnimationFrame` OK");
}

pub fn document() -> web_sys::Document {
    window()
        .document()
        .expect("should have a document on window")
}

pub fn body() -> web_sys::HtmlElement {
    document().body().expect("document should have a body")
}

pub fn log<S: Into<String>>(s: S) {
    web_sys::console::log_1(&s.into().into());
}