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use wasm_bindgen::UnwrapThrowExt;
use web_sys::HtmlInputElement;
use yew::prelude::*;

#[derive(Clone, Debug, Properties, PartialEq)]
pub struct RadioProps {
    /// The `name` attribute for this form element.
    ///
    /// All members of the same radio group must have the same value for their `name` attribute.
    pub name: String,
    /// The `value` attribute for this form element.
    ///
    /// This is different from other form elements, as this value does not change. It represents
    /// the value to be used for the radio group overall when this element is selected.
    pub value: String,
    /// The value of the currently selected radio of this radio group.
    pub checked_value: Option<String>,
    /// The callback to be used for propagating changes to the selected radio of the radio group.
    pub update: Callback<String>,
    #[prop_or_default]
    pub children: Children,
    #[prop_or_default]
    pub classes: Classes,
    /// Disable this component.
    #[prop_or_default]
    pub disabled: bool,
}

/// The mutually exclusive radio buttons in their native format.
///
/// [https://bulma.io/documentation/form/radio/](https://bulma.io/documentation/form/radio/)
///
/// All YBC form components are controlled components. This means that the value of the field must
/// be provided from a parent component, and changes to this component are propagated to the parent
/// component via callback.
#[function_component(Radio)]
pub fn radio(props: &RadioProps) -> Html {
    let class = classes!("radio", props.classes.clone());
    let oninput = props.update.reform(|ev: web_sys::InputEvent| {
        let input: HtmlInputElement = ev.target_dyn_into().expect_throw("event target should be an input");
        input.value()
    });
    html! {
        <label {class} disabled={props.disabled}>
            <input
                type="radio"
                name={props.name.clone()}
                value={props.value.clone()}
                checked={props.checked_value.as_ref().map(|val| val == &props.value).unwrap_or(false)}
                {oninput}
                disabled={props.disabled}
                />
            {props.children.clone()}
        </label>
    }
}