import { lazy, Suspense, useEffect, useState } from "react";
import { useLocation } from "react-router";
import { t } from "@lingui/core/macro";
import { useAuth } from "../../hooks/auth/useAuth.ts";
const DumpCreateModal = lazy(() =>
import("../dump/create/DumpCreateModal.tsx").then((m) => ({
default: m.DumpCreateModal,
}))
);
/**
* Floating "new dump" button shown once the header has scrolled out of view.
* Sits in the bottom-right corner and lifts above the global player (which is
* full-width on mobile) so the two never overlap. Only rendered for signed-in
* users — dump creation requires an account.
*
* Mounted once at the app root (not per-page) since some pages render their own
* header instead of going through PageShell. Visibility is derived from a live
* read of the current page's `.app-header`, so it survives client-side
* navigation and lazily-mounted route headers.
*/
export function DumpFab() {
const { user } = useAuth();
const location = useLocation();
const [headerHidden, setHeaderHidden] = useState(false);
const [modalOpen, setModalOpen] = useState(false);
// Reserve clearance at the end of the scroll so the floating button never
// hides the last content when scrolled all the way down.
useEffect(() => {
if (!user) return;
document.body.classList.add("has-fab");
return () => document.body.classList.remove("has-fab");
}, [user]);
// Reveal the button once the header's bottom edge scrolls above the viewport.
// Re-reading the header on every tick keeps this correct across navigation
// and lazily-mounted pages, where the header element is replaced.
useEffect(() => {
if (!user) return;
const update = () => {
const header = document.querySelector(".app-header");
setHeaderHidden(!!header && header.getBoundingClientRect().bottom <= 0);
};
update();
globalThis.addEventListener("scroll", update, { passive: true });
globalThis.addEventListener("resize", update);
// Body height changes when a lazy route finishes mounting — re-check then,
// since no scroll/resize event fires in that case.
const ro = new ResizeObserver(update);
ro.observe(document.body);
return () => {
globalThis.removeEventListener("scroll", update);
globalThis.removeEventListener("resize", update);
ro.disconnect();
};
}, [user, location.pathname]);
if (!user) return null;
return (
<>
{modalOpen && (
setModalOpen(false)} />
)}
);
}