nova_forms/components/
radio.rs

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use std::{fmt::Display, hash::Hash, str::FromStr};

use crate::{use_translation, NovaFormContext, QueryString};
use leptos::*;
use strum::{IntoEnumIterator, ParseError};

/// A component that renders an input field.
/// It takes a datatype as a type parameter and automatically handles parsing and validation.
#[component]
pub fn Radio<T>(
    /// The label of the input field.
    #[prop(into)] label: TextProp,
    /// The query string that binds the input field to the form data.
    #[prop(into)] bind: QueryString,
    /// The placeholder text of the input field.
    #[prop(optional, into)] debug_value: Option<T>,
    /// The initial value of the input field.
    #[prop(optional, into)] value: MaybeProp<T>,
) -> impl IntoView
where
    T: IntoEnumIterator + FromStr<Err = ParseError> + Into<&'static str> + Clone + Copy + Default + Eq + Hash + Display + 'static
{    
    let (qs, form_value) = bind.form_value::<T>();

    let (input_value, set_input_value) = create_signal(None);

    let raw_value = Signal::derive(move || {
        if cfg!(debug_assertions) {
            input_value.get()
                .unwrap_or_else(|| value.get()
                    .or_else(|| form_value.clone().ok())
                    .or_else(|| debug_value.clone())
                    .unwrap_or_else(|| T::default())
                    .into()
                    .to_string())
        } else {
            input_value.get()
                .unwrap_or_else(|| value.get()
                    .or_else(|| form_value.clone().ok())
                    .map(|v| v.into().to_string())
                    .unwrap_or_default())
        }
    });

    let nova_form_context = expect_context::<NovaFormContext>();
    let validation_trigger = nova_form_context.register_input(qs.clone(), label.clone());

    let show_error = Signal::derive(move || {
        input_value.get().is_some() || validation_trigger.get()
    });

    let parsed_value = Signal::derive(move || T::from_str(raw_value.get().as_str()));

    let qs_clone = qs.clone();
    on_cleanup(move || {
        nova_form_context.deregister_input(qs_clone);
    });

    let qs_clone = qs.clone();
    create_effect(move |_| {
        let qs = qs_clone.clone();
        nova_form_context.set_error(&qs, parsed_value.get().is_err());
    });

    /*let input_elem = html::input()
        .attr("type", "radio")
        .attr("id", qs.to_string())
        .attr("name", qs.to_string())
        .attr("checked", move || raw_value.get())
        .attr("value", move || raw_value.get().to_string())
        .on(ev::input, move |ev| {
            set_input_value.set(Some(event_target_value(&ev)));
        });*/

    view! {
        <div
            class="field radio"
            class:error=move || parsed_value.get().is_err() && show_error.get()
            class:ok=move || parsed_value.get().is_ok() && show_error.get()
        >   
            <fieldset>
                <legend>{label}</legend>
                <For
                    each={move || T::iter()}
                    key={|item| *item}
                    children={move |item| {
                        let input_elem = html::input()
                            .attr("type", "radio")
                            .attr("id", format!("{}({})", qs.to_string(), item.into()))
                            .attr("name", qs.to_string())
                            .attr("checked", move || parsed_value.get() == Ok(item))
                            .attr("value", move || item.into())
                            .on(ev::input, move |ev| {
                                set_input_value.set(Some(event_target_value(&ev)));
                            });
                        
                        view! {
                            <label for=format!("{}({})", qs.to_string(), item.into())>
                                {input_elem}
                                <span class="custom-radio"></span>
                                <span class="custom-radio-label">{use_translation(item)}</span>
                            </label>
                        }
                    }}
                />
                {move || {
                    if let (Err(err), true) = (
                        parsed_value.get(),
                        show_error.get(),
                    ) {
                        view! { <span class="error-message">{use_translation(err)}</span> }
                            .into_view()
                    } else {
                        View::default()
                    }
                }}
            </fieldset>
            
        </div>
    }
}