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use wasm_bindgen::JsCast;
use web_sys;

/// Convenience function to avoid repeating expect logic.
pub fn window() -> web_sys::Window {
    web_sys::window().expect("Can't find the global Window")
}

/// Convenience function to access the web_sys DOM document.
pub fn document() -> web_sys::Document {
    window().document().expect("Can't find document")
}

/// Simplify getting the value of input elements; required due to the need to cast
/// from general nodes/elements to HTML__Elements.
pub fn input_value(target: &web_sys::EventTarget) -> String {
    if let Some(input) = target.dyn_ref::<web_sys::HtmlInputElement>() {
        return input.value();
    }
    if let Some(input) = target.dyn_ref::<web_sys::HtmlTextAreaElement>() {
        return input.value();
    }
    if let Some(input) = target.dyn_ref::<web_sys::HtmlSelectElement>() {
        return input.value();
    }
    "".into()
}

/// todo more DRY that could be addressed by Traits. ?
pub fn set_value(target: &web_sys::EventTarget, value: &str) {
    if let Some(input) = target.dyn_ref::<web_sys::HtmlInputElement>() {
        input.set_value(value);
    }
    if let Some(input) = target.dyn_ref::<web_sys::HtmlTextAreaElement>() {
        input.set_value(value);
    }
    if let Some(input) = target.dyn_ref::<web_sys::HtmlSelectElement>() {
        input.set_value(value);
    }
}