EventSnap/frontend/src/routes/feed/+page.svelte

<script lang="ts">
	import { goto } from '$app/navigation';
	import { getToken, getUserId } from '$lib/auth';
	import { api } from '$lib/api';
	import { connectSse, disconnectSse, onSseEvent } from '$lib/sse';
	import { onMount, onDestroy } from 'svelte';
	import VirtualFeed from '$lib/components/VirtualFeed.svelte';
	import HashtagChips from '$lib/components/HashtagChips.svelte';
	import LightboxModal from '$lib/components/LightboxModal.svelte';
	import OnboardingGuide from '$lib/components/OnboardingGuide.svelte';
	import ContextSheet, { type ContextAction } from '$lib/components/ContextSheet.svelte';
	import ConfirmSheet from '$lib/components/ConfirmSheet.svelte';
	import Skeleton from '$lib/components/Skeleton.svelte';
	import { refreshQuota } from '$lib/quota-store';
	import { exportStatus } from '$lib/export-status-store';
	import { toast, toastError } from '$lib/toast-store';
	import { pullToRefresh } from '$lib/actions/pull-to-refresh';
	import { vibrate } from '$lib/haptics';
	import { filterUploads } from '$lib/feed-filter';
	import type { FeedUpload, FeedResponse, HashtagCount, DeltaResponse } from '$lib/types';

	let uploads = $state<FeedUpload[]>([]);
	let hashtags = $state<HashtagCount[]>([]);
	let selectedHashtag = $state<string | null>(null);
	let nextCursor = $state<string | null>(null);
	let loadingMore = $state(false);
	let initialLoading = $state(true);
	let refreshing = $state(false);
	let pullProgress = $state(0); // 0–1+ during the drag, 0 when idle
	let selectedUpload = $state<FeedUpload | null>(null);
	// Set when a truncated feed-delta means we missed too much to merge — shows a
	// tap-to-refresh pill instead of yanking the user's scroll to page 1.
	let feedStale = $state(false);
	let sentinel: HTMLDivElement;
	let feedObserver: IntersectionObserver | null = null;
	let inPlaceRefreshTimer: ReturnType<typeof setTimeout> | null = null;
	let pendingDeleteId = $state<string | null>(null);

	// ─────────────────────────────────────────────────────────────────────────
	// onMount A — DOM side-effects only (overscroll lock). Synchronous, returns
	// its own cleanup. Kept separate from the data-loading onMount below so its
	// cleanup can't be accidentally clobbered when someone edits the async one.
	// ─────────────────────────────────────────────────────────────────────────
	onMount(() => {
		if (typeof document === 'undefined') return;
		const prev = document.documentElement.style.overscrollBehaviorY;
		document.documentElement.style.overscrollBehaviorY = 'contain';
		return () => {
			document.documentElement.style.overscrollBehaviorY = prev;
		};
	});

	// View mode
	let viewMode = $state<'list' | 'grid'>('list');

	// Grid search / filter state
	let searchQuery = $state('');
	let showAutocomplete = $state(false);

	interface Filter {
		type: 'tag' | 'user';
		value: string;
	}
	let activeFilters = $state<Filter[]>([]);

	let unsubscribers: (() => void)[] = [];

	// Long-press / context-sheet state for post actions
	let contextTarget = $state<FeedUpload | null>(null);
	const myUserId = getUserId();
	const contextActions = $derived<ContextAction[]>(buildContextActions(contextTarget));

	function buildContextActions(target: FeedUpload | null): ContextAction[] {
		if (!target) return [];
		const actions: ContextAction[] = [
			{
				label: 'Original anzeigen',
				icon: '⤓',
				onClick: () => {
					window.open(`/api/v1/upload/${target.id}/original`, '_blank');
				}
			}
		];
		if (target.user_id === myUserId) {
			actions.unshift({
				label: 'Löschen',
				icon: '🗑',
				tone: 'danger',
				onClick: () => {
					pendingDeleteId = target.id;
				}
			});
		}
		return actions;
	}

	function openContextSheet(upload: FeedUpload) {
		contextTarget = upload;
	}

	async function confirmDelete() {
		const id = pendingDeleteId;
		if (!id) return;
		pendingDeleteId = null;
		try {
			await api.delete(`/upload/${id}`);
			uploads = uploads.filter((u) => u.id !== id);
			if (selectedUpload?.id === id) selectedUpload = null;
			void refreshQuota();
		} catch (e) {
			toastError(e);
		}
	}

	// ── Autocomplete derived from loaded uploads (no extra API calls) ────────
	let allTags = $derived.by(() => {
		// eslint-disable-next-line svelte/prefer-svelte-reactivity -- local throwaway counter inside a $derived.by; never stored in $state, so no reactivity is involved.
		const freq = new Map<string, number>();
		for (const u of uploads) {
			for (const m of (u.caption ?? '').matchAll(/#(\w+)/g)) {
				const t = m[1].toLowerCase();
				freq.set(t, (freq.get(t) ?? 0) + 1);
			}
		}
		return [...freq.entries()].sort((a, b) => b[1] - a[1]).map(([t]) => t);
	});

	let allUploaders = $derived([...new Set(uploads.map((u) => u.uploader_name))].sort());

	// The suggestion SOURCE is frozen for as long as the dropdown is open.
	//
	// `allTags`/`allUploaders` derive from `uploads`, which mutates under us constantly: every
	// `upload-processed` / `new-upload` SSE triggers `refreshFeedInPlace`, which replaces the array.
	// `allTags` is ordered by FREQUENCY, so a photo landing mid-interaction can REORDER the open
	// dropdown — the user presses "#wedding" and the list reshuffles under their finger. At a party,
	// where photos stream in the whole time, that is a live mis-tap hazard, not a theoretical one.
	// (It also detaches the button mid-press: the handler is `onmousedown`, so a re-render between
	// mousedown and mouseup destroys the element being pressed.)
	//
	// Freezing on focus keeps the list the user is looking at identical to the list they act on.
	// Typing still filters — it just filters a stable source. New photos appear in the suggestions
	// the next time the dropdown is opened, which is soon enough for a filter picker.
	let frozenTags = $state<string[]>([]);
	let frozenUploaders = $state<string[]>([]);

	// Re-snapshot only when actually opening. Called on focus AND on click/input, because after a
	// selection the input keeps focus (the dropdown suppresses the blur) — so `onfocus` will not
	// fire again, and without these the picker could never be reopened without clicking away first.
	// Guarding on `showAutocomplete` keeps typing from re-freezing on every keystroke, which would
	// let the list churn again mid-interaction and undo the point of freezing it.
	function openAutocomplete() {
		if (!showAutocomplete) {
			frozenTags = allTags;
			frozenUploaders = allUploaders;
		}
		showAutocomplete = true;
	}

	let suggestions = $derived.by((): Filter[] => {
		const q = searchQuery.trim();
		if (!q) {
			// Show top suggestions on focus
			if (!showAutocomplete) return [];
			return [
				...frozenUploaders.slice(0, 3).map((u) => ({ type: 'user' as const, value: u })),
				...frozenTags.slice(0, 3).map((t) => ({ type: 'tag' as const, value: t }))
			];
		}
		if (q.startsWith('#')) {
			const prefix = q.slice(1).toLowerCase();
			return frozenTags
				.filter((t) => t.startsWith(prefix))
				.slice(0, 8)
				.map((t) => ({ type: 'tag' as const, value: t }));
		}
		const lower = q.toLowerCase();
		return [
			...frozenUploaders
				.filter((u) => u.toLowerCase().includes(lower))
				.slice(0, 4)
				.map((u) => ({ type: 'user' as const, value: u })),
			...frozenTags
				.filter((t) => t.includes(lower))
				.slice(0, 4)
				.map((t) => ({ type: 'tag' as const, value: t }))
		];
	});

	// ── Filtered uploads for grid view ───────────────────────────────────────
	let displayUploads = $derived.by(() => {
		if (viewMode === 'list' || activeFilters.length === 0) return uploads;
		return filterUploads(uploads, activeFilters);
	});

	// ─────────────────────────────────────────────────────────────────────────
	// onMount B — auth gate, recovery toast, data load, SSE subscriptions,
	// infinite-scroll observer. Cleanup of the SSE handlers lives in onDestroy
	// below (not in a returned cleanup) because this callback is async.
	// ─────────────────────────────────────────────────────────────────────────
	onMount(async () => {
		if (!getToken()) {
			goto('/join');
			return;
		}

		// Surface the welcome-back toast set by /recover. Lives here (not on /account)
		// because /feed is the first hydrated route after a successful PIN recovery —
		// the toast should land in the same beat as the "you're in" feeling.
		if (typeof sessionStorage !== 'undefined') {
			const welcome = sessionStorage.getItem('eventsnap_just_recovered');
			if (welcome) {
				sessionStorage.removeItem('eventsnap_just_recovered');
				toast(`Willkommen zurück, ${welcome}!`, 'success');
			}
		}

		await Promise.all([loadFeed(), loadHashtags()]);
		connectSse();

		unsubscribers.push(
			onSseEvent('new-upload', (data) => {
				try {
					const upload: FeedUpload = JSON.parse(data);
					// GRID view must NOT prepend live. Its rows are POSITIONAL windows
					// (`uploads.slice(i * COLS, …)` in VirtualFeed), so inserting at the head shifts
					// every tile by one slot: each row's keyed `{#each}` then sees a different set of
					// ids and Svelte DESTROYS AND RECREATES the tile nodes. Two consequences at a
					// party, where photos arrive continuously — a tap in flight is swallowed when its
					// node is torn out, and the photo under the user's finger silently becomes a
					// DIFFERENT photo, so they like or open one they never chose.
					//
					// The "neue Beiträge" pill already exists for exactly this: buffer, and let the
					// user pull the new photos in when they are not mid-tap. List view is keyed by id
					// at the top level and anchored, so its nodes survive a prepend — it stays live.
					if (viewMode === 'grid') {
						feedStale = true;
						return;
					}
					uploads = [upload, ...uploads];
				} catch {
					/* ignore */
				}
			}),
			// A processed upload gains preview/thumbnail URLs. Coalesce bursts (bulk
			// uploads fire one per file) into a single in-place merge so the feed
			// neither hammers the server nor collapses to page 1 / loses scroll.
			onSseEvent('upload-processed', () => scheduleInPlaceRefresh()),
			onSseEvent('upload-deleted', (data) => {
				try {
					const payload = JSON.parse(data) as { upload_id: string };
					uploads = uploads.filter((u) => u.id !== payload.upload_id);
					if (selectedUpload?.id === payload.upload_id) selectedUpload = null;
				} catch {
					/* ignore */
				}
			}),
			// A background transcode failed: the backend already cleaned up (refunded
			// quota, removed the row) and an upload-deleted evicts the card. Only the
			// uploader gets a toast — registered before upload-deleted so the card is
			// still present to check ownership.
			onSseEvent('upload-error', (data) => {
				try {
					const { upload_id } = JSON.parse(data) as { upload_id: string };
					const mine = uploads.find((u) => u.id === upload_id && u.user_id === myUserId);
					if (mine) {
						toast('Ein Upload konnte nicht verarbeitet werden.', 'error');
						void refreshQuota();
					}
				} catch {
					/* ignore */
				}
			}),
			// A banned user's uploads were hidden — drop all their cards live.
			onSseEvent('user-hidden', (data) => {
				try {
					const { user_id } = JSON.parse(data) as { user_id: string };
					uploads = uploads.filter((u) => u.user_id !== user_id);
					if (selectedUpload && selectedUpload.user_id === user_id) selectedUpload = null;
				} catch {
					/* ignore */
				}
			}),
			// Patch the single affected card in place from the SSE payload instead of
			// refetching page 1 — a busy event fires these constantly and a full reload
			// would yank every scrolled-down user back to the top on each reaction.
			onSseEvent('like-update', (data) => patchCount(data, 'like_count')),
			onSseEvent('new-comment', (data) => patchCount(data, 'comment_count')),
			// Synthetic event from the SSE client after a foreground reconnect — merge
			// any uploads + deletions we missed while the tab was hidden.
			onSseEvent('feed-delta', (data) => {
				try {
					const delta = JSON.parse(data) as DeltaResponse;
					// Evict removed content FIRST and unconditionally — deletions AND ban-hides are
					// explicit, uncapped lists, so they apply even on a truncated delta (the stale-pill
					// refresh below only prunes page 1, so a banned user's cards beyond page 1 would
					// otherwise linger). Replays a `user-hidden`/delete missed while the tab was hidden.
					if (delta.deleted_ids.length) {
						const dead = new Set(delta.deleted_ids);
						uploads = uploads.filter((u) => !dead.has(u.id));
						if (selectedUpload && dead.has(selectedUpload.id)) selectedUpload = null;
					}
					if (delta.hidden_user_ids.length) {
						const hidden = new Set(delta.hidden_user_ids);
						uploads = uploads.filter((u) => !hidden.has(u.user_id));
						if (selectedUpload && hidden.has(selectedUpload.user_id)) selectedUpload = null;
					}
					if (delta.truncated) {
						// Missed more than the backend delta cap while backgrounded — the
						// delta is only the newest slice, so merging would leave a silent gap
						// of older-but-still-new uploads. Resync from page 1 instead.
						// Rather than involuntarily yank the user to page 1, surface a
						// tap-to-refresh pill so they keep scroll until they resync.
						feedStale = true;
						return;
					}
					if (delta.uploads.length) {
						const seen = new Set(uploads.map((u) => u.id));
						const fresh = delta.uploads.filter((u) => !seen.has(u.id));
						if (fresh.length) uploads = [...fresh, ...uploads];
					}
					// A delta reconciles new uploads and deletions, but not like/comment
					// counts that changed on already-visible cards while we were
					// disconnected or lagged (a `resync`). Debounced page-1 refresh merges
					// those fresh counts in place without disturbing scroll.
					scheduleInPlaceRefresh();
				} catch {
					/* ignore */
				}
			})
		);

		if (sentinel) {
			feedObserver = new IntersectionObserver(
				(entries) => {
					if (entries[0].isIntersecting && nextCursor && !loadingMore) loadMore();
				},
				{ rootMargin: '200px' }
			);
			feedObserver.observe(sentinel);
		}
	});

	onDestroy(() => {
		disconnectSse();
		for (const unsub of unsubscribers) unsub();
		feedObserver?.disconnect();
		if (inPlaceRefreshTimer) clearTimeout(inPlaceRefreshTimer);
	});

	// Patch a single upload's like/comment count from an SSE payload without
	// disturbing scroll position or the rest of the loaded feed.
	function patchCount(data: string, field: 'like_count' | 'comment_count') {
		try {
			const payload = JSON.parse(data) as {
				upload_id: string;
				like_count?: number;
				comment_count?: number;
			};
			const value = payload[field];
			if (value === undefined) return;
			uploads = uploads.map((u) => (u.id === payload.upload_id ? { ...u, [field]: value } : u));
			if (selectedUpload?.id === payload.upload_id) {
				selectedUpload = { ...selectedUpload, [field]: value };
			}
		} catch {
			/* ignore malformed payloads */
		}
	}

	// Debounced page-1 fetch that *merges* (updates existing cards in place, prepends
	// genuinely new ones) rather than replacing the array — preserves scroll and any
	// pages already loaded below the fold.
	function scheduleInPlaceRefresh() {
		if (inPlaceRefreshTimer) return;
		inPlaceRefreshTimer = setTimeout(() => {
			inPlaceRefreshTimer = null;
			void refreshFeedInPlace();
		}, 800);
	}

	async function refreshFeedInPlace() {
		try {
			// eslint-disable-next-line svelte/prefer-svelte-reactivity -- local query-string builder for a fetch; not reactive state.
			const params = new URLSearchParams();
			if (selectedHashtag) params.set('hashtag', selectedHashtag);
			params.set('limit', '20');
			const res = await api.get<FeedResponse>(`/feed?${params}`);
			const byId = new Map(res.uploads.map((u) => [u.id, u]));
			const known = new Set(uploads.map((u) => u.id));
			uploads = uploads.map((u) => byId.get(u.id) ?? u);
			const fresh = res.uploads.filter((u) => !known.has(u.id));
			if (fresh.length) uploads = [...fresh, ...uploads];
		} catch {
			// Background refresh — stay quiet, the next event or pull-to-refresh retries.
		}
	}

	async function loadFeed(refresh = false) {
		// Any full refresh (pill tap, pull-to-refresh, filter change) resyncs page 1,
		// so the "new posts" pill is no longer relevant — clear it here rather than
		// only in the pill's own onclick, or a pull-to-refresh leaves it stranded.
		if (refresh) feedStale = false;
		try {
			// eslint-disable-next-line svelte/prefer-svelte-reactivity -- local query-string builder for a fetch; not reactive state.
			const params = new URLSearchParams();
			if (!refresh && nextCursor) params.set('cursor', nextCursor);
			if (selectedHashtag) params.set('hashtag', selectedHashtag);
			params.set('limit', '20');
			const res = await api.get<FeedResponse>(`/feed?${params}`);
			uploads = res.uploads;
			nextCursor = res.next_cursor;
		} catch (e) {
			// Initial / user-triggered refresh is worth surfacing — background SSE refetches are noisier and silenced below.
			if (!refresh) toastError(e);
		} finally {
			initialLoading = false;
		}
	}

	async function loadMore() {
		if (!nextCursor || loadingMore) return;
		loadingMore = true;
		try {
			// eslint-disable-next-line svelte/prefer-svelte-reactivity -- local query-string builder for a fetch; not reactive state.
			const params = new URLSearchParams();
			params.set('cursor', nextCursor);
			if (selectedHashtag) params.set('hashtag', selectedHashtag);
			params.set('limit', '20');
			const res = await api.get<FeedResponse>(`/feed?${params}`);
			uploads = [...uploads, ...res.uploads];
			nextCursor = res.next_cursor;
		} catch (e) {
			toastError(e);
		} finally {
			loadingMore = false;
		}
	}

	async function loadHashtags() {
		try {
			hashtags = await api.get<HashtagCount[]>('/hashtags');
		} catch {
			// Hashtag panel is a discoverability nicety — silent fail is acceptable; the feed still works.
		}
	}

	async function pullRefresh() {
		if (refreshing) return;
		refreshing = true;
		pullProgress = 0;
		vibrate(10);
		try {
			nextCursor = null;
			await Promise.all([loadFeed(true), loadHashtags()]);
		} finally {
			refreshing = false;
		}
	}

	function selectHashtag(tag: string | null) {
		selectedHashtag = tag;
		nextCursor = null;
		loadFeed();
	}

	async function handleLike(id: string) {
		try {
			// Set state from the server's authoritative response rather than blind-inverting
			// local state. On a second device (same recovered user), the `like-update`
			// broadcast only carries `like_count` — so a blind invert would drift
			// `liked_by_me` until refresh. The response gives both, exactly.
			const res = await api.post<{ liked: boolean; like_count: number | null }>(
				`/upload/${id}/like`
			);
			vibrate(10);
			// like_count is null when the server's count query hiccuped — keep the current
			// count in that case rather than adopting a wrong number.
			uploads = uploads.map((u) =>
				u.id === id
					? { ...u, liked_by_me: res.liked, like_count: res.like_count ?? u.like_count }
					: u
			);
			if (selectedUpload?.id === id) {
				selectedUpload = {
					...selectedUpload,
					liked_by_me: res.liked,
					like_count: res.like_count ?? selectedUpload.like_count
				};
			}
		} catch (e) {
			toastError(e);
		}
	}

	function openComments(id: string) {
		const u = uploads.find((u) => u.id === id);
		if (u) selectedUpload = u;
	}

	function selectSuggestion(item: Filter) {
		if (!activeFilters.some((f) => f.type === item.type && f.value === item.value)) {
			activeFilters = [...activeFilters, item];
		}
		searchQuery = '';
		showAutocomplete = false;
	}

	function removeFilter(item: Filter) {
		activeFilters = activeFilters.filter((f) => !(f.type === item.type && f.value === item.value));
	}

	function clearFilters() {
		activeFilters = [];
		searchQuery = '';
	}

	function switchView(mode: 'list' | 'grid') {
		viewMode = mode;
		if (mode === 'list') {
			searchQuery = '';
			showAutocomplete = false;
		}
	}
</script>

<div
	class="min-h-screen bg-gray-50 pb-24 dark:bg-gray-950"
	use:pullToRefresh={{
		onrefresh: pullRefresh,
		onpull: (_, progress) => (pullProgress = progress),
		disabled: initialLoading
	}}
>
	<!-- Live pull-progress indicator: grows during the drag, rotates past threshold,
	     swaps to a spinner once the network refresh kicks off. -->
	{#if refreshing || pullProgress > 0}
		<div
			class="pointer-events-none fixed left-0 right-0 top-[calc(env(safe-area-inset-top)+0.5rem)] z-40 flex justify-center"
		>
			<div
				class="rounded-full bg-white/90 px-3 py-1 text-xs font-medium text-blue-600 shadow transition-opacity dark:bg-gray-900/90 dark:text-blue-300"
				style="opacity: {refreshing ? 1 : Math.min(1, pullProgress)}"
			>
				{#if refreshing}
					<span class="inline-flex items-center gap-2">
						<span
							class="inline-block h-3 w-3 animate-spin rounded-full border-2 border-blue-200 border-t-blue-600 dark:border-blue-700 dark:border-t-blue-300"
						></span>
						Aktualisiere…
					</span>
				{:else}
					<svg
						class="inline-block h-4 w-4 transition-transform"
						style="transform: rotate({Math.min(180, pullProgress * 180)}deg)"
						fill="none"
						viewBox="0 0 24 24"
						stroke="currentColor"
						stroke-width="2.5"
						aria-hidden="true"
					>
						<path
							stroke-linecap="round"
							stroke-linejoin="round"
							d="M19.5 13.5L12 21m0 0l-7.5-7.5M12 21V3"
						/>
					</svg>
				{/if}
			</div>
		</div>
	{/if}
	{#if feedStale}
		<div
			class="pointer-events-none fixed left-0 right-0 top-[calc(env(safe-area-inset-top)+0.5rem)] z-40 flex justify-center"
		>
			<button
				type="button"
				class="pointer-events-auto rounded-full border border-primary-400 bg-primary-100 px-4 py-1.5 text-xs font-semibold text-primary-800 shadow-lg hover:border-primary-500 hover:bg-primary-200 dark:border-primary-500/50 dark:bg-primary-950/60 dark:text-primary-200"
				onclick={() => {
					feedStale = false;
					void loadFeed(true);
				}}
			>
				Neue Beiträge – tippen zum Aktualisieren
			</button>
		</div>
	{/if}
	<!-- Sticky header — opaque fallback for browsers without backdrop-filter. -->
	<div
		class="sticky top-0 z-30 border-b border-gray-200 bg-white/95 pt-[env(safe-area-inset-top)] backdrop-blur supports-[not(backdrop-filter:blur(0))]:bg-white dark:border-gray-800 dark:bg-gray-900/95 dark:supports-[not(backdrop-filter:blur(0))]:bg-gray-900"
	>
		<div class="mx-auto flex max-w-2xl items-center justify-between px-4 py-3">
			<h1 class="text-lg font-bold text-gray-900 dark:text-gray-100">Galerie</h1>

			<div class="flex items-center gap-2">
				<!-- Diashow entry — tablet/desktop only (mobile uses the Account page tile). -->
				<button
					onclick={() => goto('/diashow')}
					class="hidden rounded-md p-1.5 text-gray-500 transition-colors hover:bg-gray-100 hover:text-gray-900 dark:text-gray-400 dark:hover:bg-gray-800 dark:hover:text-gray-100 sm:inline-flex"
					aria-label="Diashow starten"
					title="Diashow"
				>
					<svg
						class="h-5 w-5"
						fill="none"
						viewBox="0 0 24 24"
						stroke="currentColor"
						stroke-width="1.5"
					>
						<path
							stroke-linecap="round"
							stroke-linejoin="round"
							d="M3.75 7.5A2.25 2.25 0 0 1 6 5.25h12A2.25 2.25 0 0 1 20.25 7.5v9A2.25 2.25 0 0 1 18 18.75H6A2.25 2.25 0 0 1 3.75 16.5v-9Z"
						/>
						<path
							stroke-linecap="round"
							stroke-linejoin="round"
							d="M10 9.75 14.5 12 10 14.25v-4.5Z"
						/>
					</svg>
				</button>

				<!-- List / Grid toggle -->
				<div class="flex items-center gap-1 rounded-lg bg-gray-100 p-1 dark:bg-gray-800">
					<button
						onclick={() => switchView('list')}
						class="rounded-md p-1.5 transition-colors {viewMode === 'list'
							? 'bg-white text-gray-900 shadow-sm dark:bg-gray-700 dark:text-gray-100'
							: 'text-gray-400 hover:text-gray-600 dark:text-gray-500 dark:hover:text-gray-300'}"
						aria-label="Listenansicht"
					>
						<!-- bars-3 -->
						<svg
							class="h-5 w-5"
							fill="none"
							viewBox="0 0 24 24"
							stroke="currentColor"
							stroke-width="1.5"
						>
							<path
								stroke-linecap="round"
								stroke-linejoin="round"
								d="M3.75 6.75h16.5M3.75 12h16.5m-16.5 5.25h16.5"
							/>
						</svg>
					</button>
					<button
						onclick={() => switchView('grid')}
						class="rounded-md p-1.5 transition-colors {viewMode === 'grid'
							? 'bg-white text-gray-900 shadow-sm dark:bg-gray-700 dark:text-gray-100'
							: 'text-gray-400 hover:text-gray-600 dark:text-gray-500 dark:hover:text-gray-300'}"
						aria-label="Rasteransicht"
					>
						<!-- squares-2x2 -->
						<svg
							class="h-5 w-5"
							fill="none"
							viewBox="0 0 24 24"
							stroke="currentColor"
							stroke-width="1.5"
						>
							<path
								stroke-linecap="round"
								stroke-linejoin="round"
								d="M3.75 6A2.25 2.25 0 0 1 6 3.75h2.25A2.25 2.25 0 0 1 10.5 6v2.25a2.25 2.25 0 0 1-2.25 2.25H6a2.25 2.25 0 0 1-2.25-2.25V6ZM3.75 15.75A2.25 2.25 0 0 1 6 13.5h2.25a2.25 2.25 0 0 1 2.25 2.25V18a2.25 2.25 0 0 1-2.25 2.25H6A2.25 2.25 0 0 1 3.75 18v-2.25ZM13.5 6a2.25 2.25 0 0 1 2.25-2.25H18A2.25 2.25 0 0 1 20.25 6v2.25A2.25 2.25 0 0 1 18 10.5h-2.25a2.25 2.25 0 0 1-2.25-2.25V6ZM13.5 15.75a2.25 2.25 0 0 1 2.25-2.25H18a2.25 2.25 0 0 1 2.25 2.25V18A2.25 2.25 0 0 1 18 20.25h-2.25A2.25 2.25 0 0 1 13.5 18v-2.25Z"
							/>
						</svg>
					</button>
				</div>
			</div>
		</div>

		<!-- List view: hashtag chips -->
		{#if viewMode === 'list'}
			<div class="mx-auto max-w-2xl px-4 pb-2">
				<HashtagChips {hashtags} selected={selectedHashtag} onselect={selectHashtag} />
			</div>
		{/if}

		<!-- Grid view: search bar + autocomplete -->
		{#if viewMode === 'grid'}
			<div class="mx-auto max-w-2xl px-4 pb-3">
				<div class="relative">
					<div
						class="flex items-center gap-2 rounded-xl border border-gray-200 bg-gray-50 px-3 py-2 focus-within:border-blue-400 focus-within:bg-white focus-within:ring-1 focus-within:ring-blue-200 dark:border-gray-700 dark:bg-gray-800 dark:focus-within:border-blue-500 dark:focus-within:bg-gray-800"
					>
						<svg
							class="h-4 w-4 shrink-0 text-gray-400 dark:text-gray-500"
							fill="none"
							viewBox="0 0 24 24"
							stroke="currentColor"
							stroke-width="2"
						>
							<path
								stroke-linecap="round"
								stroke-linejoin="round"
								d="M21 21l-5.197-5.197m0 0A7.5 7.5 0 1 0 5.196 5.196a7.5 7.5 0 0 0 10.607 10.607Z"
							/>
						</svg>
						<input
							type="search"
							placeholder="Nutzer oder #Tag suchen…"
							bind:value={searchQuery}
							onfocus={(e) => {
								openAutocomplete();
								// Push the input above the virtual keyboard so suggestions stay visible.
								(e.currentTarget as HTMLInputElement).scrollIntoView({
									block: 'center',
									behavior: 'smooth'
								});
							}}
							onclick={openAutocomplete}
							oninput={openAutocomplete}
							onblur={() => setTimeout(() => (showAutocomplete = false), 150)}
							class="min-w-0 flex-1 bg-transparent text-sm text-gray-900 placeholder-gray-400 outline-none dark:text-gray-100 dark:placeholder-gray-500"
						/>
						{#if searchQuery}
							<button
								onclick={() => {
									searchQuery = '';
								}}
								class="shrink-0 text-gray-400 hover:text-gray-600 dark:text-gray-500 dark:hover:text-gray-300"
								aria-label="Suche löschen"
							>
								<svg
									class="h-4 w-4"
									fill="none"
									viewBox="0 0 24 24"
									stroke="currentColor"
									stroke-width="2"
								>
									<path stroke-linecap="round" stroke-linejoin="round" d="M6 18 18 6M6 6l12 12" />
								</svg>
							</button>
						{/if}
					</div>

					<!-- Autocomplete dropdown -->
					{#if showAutocomplete && suggestions.length > 0}
						<!-- `preventDefault` on the container's mousedown stops the input from blurring, which
						     is what would otherwise close this dropdown (see the input's `onblur`) before a
						     click could land on a suggestion.

						     That matters because the suggestions used to commit on `onmousedown` — purely to
						     beat that blur. Two things were wrong with it. It fired on PRESS, so sliding off a
						     suggestion you didn't mean to hit still applied the filter, with no way to abort.
						     And `selectSuggestion` sets `showAutocomplete = false`, so the button DESTROYED
						     ITSELF on the first event of the click sequence: whether the node survived to
						     `mouseup` came down to whether Svelte's flush landed in between. That is the whole
						     reason this spec was flaky under load.

						     Suppressing the blur lets the handler move to `onclick` — the LAST event — so the
						     element self-destructing is harmless, and press-then-slide-off aborts like a button
						     should. -->
						<div
							class="absolute left-0 right-0 top-full z-50 mt-1 overflow-hidden rounded-xl border border-gray-200 bg-white shadow-lg dark:border-gray-700 dark:bg-gray-900"
							onmousedown={(e) => e.preventDefault()}
							role="listbox"
							tabindex="-1"
						>
							{#each suggestions as item (item.type + ':' + item.value)}
								<button
									class="flex w-full items-center gap-3 px-4 py-2.5 text-left text-sm hover:bg-gray-50 dark:hover:bg-gray-800"
									onclick={() => selectSuggestion(item)}
								>
									{#if item.type === 'user'}
										<svg
											class="h-4 w-4 shrink-0 text-gray-400 dark:text-gray-500"
											fill="none"
											viewBox="0 0 24 24"
											stroke="currentColor"
											stroke-width="1.5"
										>
											<path
												stroke-linecap="round"
												stroke-linejoin="round"
												d="M15.75 6a3.75 3.75 0 1 1-7.5 0 3.75 3.75 0 0 1 7.5 0ZM4.501 20.118a7.5 7.5 0 0 1 14.998 0A17.933 17.933 0 0 1 12 21.75c-2.676 0-5.216-.584-7.499-1.632Z"
											/>
										</svg>
										<span class="font-medium text-gray-900 dark:text-gray-100">{item.value}</span>
									{:else}
										<span class="font-medium text-blue-500 dark:text-blue-400">#</span>
										<span class="font-medium text-gray-900 dark:text-gray-100">{item.value}</span>
									{/if}
								</button>
							{/each}
						</div>
					{/if}
				</div>

				<!-- Active filter chips -->
				{#if activeFilters.length > 0}
					<div class="mt-2 flex flex-wrap items-center gap-1.5">
						{#each activeFilters as filter (filter.type + ':' + filter.value)}
							<span
								class="flex items-center gap-1 rounded-full bg-blue-100 px-2.5 py-0.5 text-xs font-medium text-blue-700 dark:bg-blue-900/40 dark:text-blue-200"
							>
								{filter.type === 'tag' ? '#' : ''}{filter.value}
								<button
									onclick={() => removeFilter(filter)}
									class="ml-0.5 hover:text-blue-900 dark:hover:text-blue-100"
									aria-label="Filter entfernen"
								>
									<svg
										class="h-3 w-3"
										fill="none"
										viewBox="0 0 24 24"
										stroke="currentColor"
										stroke-width="2.5"
									>
										<path stroke-linecap="round" stroke-linejoin="round" d="M6 18 18 6M6 6l12 12" />
									</svg>
								</button>
							</span>
						{/each}
						{#if activeFilters.length >= 2}
							<button
								onclick={clearFilters}
								class="text-xs text-gray-400 hover:text-gray-600 dark:text-gray-500 dark:hover:text-gray-300"
							>
								Alle löschen
							</button>
						{/if}
					</div>
				{/if}
			</div>
		{/if}
	</div>

	<!-- Download banner — appears for everyone (esp. guests) once the host has
	     released the gallery, so the keepsake download is discoverable from the feed
	     and not only via the Export tab. -->
	{#if $exportStatus.released}
		<div class="mx-auto max-w-2xl px-4 pt-3">
			<a
				href="/export"
				data-testid="feed-export-banner"
				class="flex items-center gap-3 rounded-2xl border border-primary-300 bg-primary-50 p-4 transition hover:bg-primary-100 dark:border-primary-800/60 dark:bg-primary-950/30 dark:hover:bg-primary-900/30"
			>
				<span
					class="flex h-10 w-10 shrink-0 items-center justify-center rounded-full bg-primary-100 text-primary-700 dark:bg-primary-900/50 dark:text-primary-300"
				>
					<svg
						class="h-5 w-5"
						fill="none"
						viewBox="0 0 24 24"
						stroke="currentColor"
						stroke-width="1.5"
					>
						<path
							stroke-linecap="round"
							stroke-linejoin="round"
							d="M3 16.5v2.25A2.25 2.25 0 0 0 5.25 21h13.5A2.25 2.25 0 0 0 21 18.75V16.5M16.5 12 12 16.5m0 0L7.5 12m4.5 4.5V3"
						/>
					</svg>
				</span>
				<span class="min-w-0 flex-1">
					<span class="block font-semibold text-primary-900 dark:text-primary-100"
						>Galerie herunterladen</span
					>
					<span class="block text-sm text-primary-800/80 dark:text-primary-300/80"
						>Alle Fotos als ZIP und als Offline-Album sichern.</span
					>
				</span>
				<svg
					class="h-5 w-5 shrink-0 text-primary-400"
					fill="none"
					viewBox="0 0 24 24"
					stroke="currentColor"
					stroke-width="2"
				>
					<path stroke-linecap="round" stroke-linejoin="round" d="M8.25 4.5l7.5 7.5-7.5 7.5" />
				</svg>
			</a>
		</div>
	{/if}

	<!-- Content -->
	{#if initialLoading && uploads.length === 0}
		<div class="mx-auto max-w-2xl" data-testid="feed-skeleton">
			{#if viewMode === 'list'}
				{#each Array(3) as _, i (i)}
					<Skeleton variant="card" />
				{/each}
			{:else}
				<div class="grid grid-cols-3 gap-0.5">
					{#each Array(9) as _, i (i)}
						<Skeleton variant="tile" />
					{/each}
				</div>
			{/if}
		</div>
	{:else if uploads.length === 0}
		<div class="py-20 text-center">
			<p class="text-lg text-gray-400 dark:text-gray-500">Noch keine Fotos.</p>
			<p class="mt-1 text-sm text-gray-400 dark:text-gray-500">Tippe auf den Plus-Button unten!</p>
		</div>
	{:else if viewMode === 'list'}
		<!-- List view: chronological full-width cards (DOM-windowed) -->
		<div class="mx-auto max-w-2xl">
			<VirtualFeed
				mode="list"
				{uploads}
				{myUserId}
				onlike={handleLike}
				oncomment={openComments}
				onselect={(u) => (selectedUpload = u)}
				oncontextmenu={openContextSheet}
			/>
		</div>
	{:else}
		<!-- Grid view: 3-col, filters applied (DOM-windowed by row) -->
		<div class="mx-auto max-w-2xl">
			{#if displayUploads.length === 0}
				<div class="py-16 text-center">
					<p class="text-sm text-gray-400 dark:text-gray-500">
						Keine Treffer für die gewählten Filter.
					</p>
					{#if nextCursor}
						<p class="mt-1 text-xs text-gray-400 dark:text-gray-500">
							Es sind noch nicht alle Beiträge geladen — scrolle weiter, um mehr zu durchsuchen.
						</p>
					{/if}
					<button onclick={clearFilters} class="btn btn-ghost btn-sm mt-2"
						>Filter zurücksetzen</button
					>
				</div>
			{:else}
				<VirtualFeed
					mode="grid"
					uploads={displayUploads}
					{myUserId}
					onlike={handleLike}
					oncomment={openComments}
					onselect={(u) => (selectedUpload = u)}
					oncontextmenu={openContextSheet}
				/>
			{/if}
		</div>
	{/if}

	<!-- Infinite scroll sentinel -->
	<div class="mx-auto max-w-2xl">
		<div bind:this={sentinel} class="h-4"></div>
		{#if loadingMore}
			<div class="py-4 text-center">
				<div
					class="inline-block h-6 w-6 animate-spin rounded-full border-2 border-gray-300 border-t-blue-600 dark:border-gray-700 dark:border-t-blue-400"
				></div>
			</div>
		{/if}
	</div>
</div>

<!-- Lightbox -->
{#if selectedUpload}
	<LightboxModal
		upload={selectedUpload}
		onclose={() => (selectedUpload = null)}
		onlike={handleLike}
	/>
{/if}

<!-- Context sheet for post long-press / kebab tap -->
<ContextSheet
	open={contextTarget !== null}
	actions={contextActions}
	onClose={() => (contextTarget = null)}
/>

<!-- Branded delete confirmation — replaces window.confirm() -->
<ConfirmSheet
	open={pendingDeleteId !== null}
	title="Beitrag löschen?"
	message="Diese Aktion kann nicht rückgängig gemacht werden."
	confirmLabel="Löschen"
	tone="danger"
	onConfirm={confirmDelete}
	onCancel={() => (pendingDeleteId = null)}
/>

<!-- First-visit onboarding guide -->
<OnboardingGuide />