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fluxer_app/src/components/channel/messageAttachmentStateUtils.ts

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+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {splitMediaAndFileAttachments} from '~/components/channel/messageAttachmentUtils';
+import type {MessageAttachment} from '~/records/MessageRecord';
+import DeveloperOptionsStore from '~/stores/DeveloperOptionsStore';
+import UserSettingsStore from '~/stores/UserSettingsStore';
+import {mapAttachmentsWithExpiry} from '~/utils/AttachmentExpiryUtils';
+
+export interface AttachmentRenderingState {
+	enrichedAttachments: Array<MessageAttachment>;
+	activeAttachments: Array<MessageAttachment>;
+	mediaAttachments: Array<MessageAttachment>;
+	shouldUseMosaic: boolean;
+}
+
+export const getAttachmentRenderingState = (
+	snapshotAttachments?: ReadonlyArray<MessageAttachment> | null,
+): AttachmentRenderingState => {
+	const attachments = snapshotAttachments ?? [];
+	const expiryApplied = mapAttachmentsWithExpiry(attachments, DeveloperOptionsStore.mockAttachmentStates);
+	const enrichedAttachments = expiryApplied.map((entry) => entry.attachment);
+	const activeAttachments = expiryApplied.filter((entry) => !entry.isExpired).map((entry) => entry.attachment);
+	const {mediaAttachments} = splitMediaAndFileAttachments(activeAttachments);
+	const shouldUseMosaic = mediaAttachments.length >= 2 && UserSettingsStore.getInlineAttachmentMedia();
+
+	return {
+		enrichedAttachments,
+		activeAttachments,
+		mediaAttachments,
+		shouldUseMosaic,
+	};
+};