use std::time::Duration;

use leptos::prelude::*;
use wasm_bindgen_futures::spawn_local;

/// Context type: read/write access to the current toast message.
#[derive(Copy, Clone)]
pub struct ToastMsg(pub RwSignal<Option<String>>);

pub fn provide_toast() -> ToastMsg {
    let toast = RwSignal::new(Option::<String>::None);
    let t = ToastMsg(toast);
    provide_context(t);
    t
}

/// Show a toast that disappears after ~3 seconds.
pub fn show(toast: ToastMsg, msg: impl Into<String>) {
    let msg = msg.into();
    toast.0.set(Some(msg.clone()));
    spawn_local(async move {
        gloo_timers::future::sleep(Duration::from_secs(3)).await;
        if toast.0.get().as_deref() == Some(msg.as_str()) {
            toast.0.set(None);
        }
    });
}

#[component]
pub fn ToastView(toast: ToastMsg) -> impl IntoView {
    view! {
        <Show when=move || toast.0.get().is_some()>
            <div class="toast">{move || toast.0.get().unwrap_or_default()}</div>
        </Show>
    }
}