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fluxer_app/src/stores/SavedMessagesStore.tsx

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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 {makeAutoObservable} from 'mobx';
+import type {Channel} from '~/records/ChannelRecord';
+import {type Message, MessageRecord} from '~/records/MessageRecord';
+import type {SavedMessageEntryRecord, SavedMessageMissingEntry} from '~/records/SavedMessageEntryRecord';
+import AuthenticationStore from '~/stores/AuthenticationStore';
+import type {ReactionEmoji} from '~/utils/ReactionUtils';
+
+class SavedMessagesStore {
+	savedMessages: Array<MessageRecord> = [];
+	missingSavedMessages: Array<SavedMessageMissingEntry> = [];
+	fetched = false;
+
+	constructor() {
+		makeAutoObservable(this, {}, {autoBind: true});
+	}
+
+	isSaved(messageId: string): boolean {
+		return (
+			this.savedMessages.some((message) => message.id === messageId) ||
+			this.missingSavedMessages.some((entry) => entry.id === messageId)
+		);
+	}
+
+	getMissingEntries(): Array<SavedMessageMissingEntry> {
+		return this.missingSavedMessages.slice();
+	}
+
+	fetchSuccess(entries: ReadonlyArray<SavedMessageEntryRecord>): void {
+		this.savedMessages = entries
+			.filter((entry) => entry.status === 'available' && entry.message)
+			.map((entry) => entry.message!)
+			.sort((a, b) => (b.id > a.id ? 1 : a.id > b.id ? -1 : 0));
+		this.missingSavedMessages = entries
+			.filter((entry) => entry.status === 'missing_permissions' || entry.message === null)
+			.map((entry) => entry.toMissingEntry());
+		this.fetched = true;
+	}
+
+	fetchError(): void {
+		this.savedMessages = [];
+		this.missingSavedMessages = [];
+		this.fetched = false;
+	}
+
+	handleChannelDelete(channel: Channel): void {
+		this.savedMessages = this.savedMessages.filter((message) => message.channelId !== channel.id);
+		this.missingSavedMessages = this.missingSavedMessages.filter((entry) => entry.channelId !== channel.id);
+	}
+
+	handleMessageUpdate(message: Message): void {
+		const index = this.savedMessages.findIndex((m) => m.id === message.id);
+		if (index === -1) return;
+
+		this.savedMessages = [
+			...this.savedMessages.slice(0, index),
+			this.savedMessages[index].withUpdates(message),
+			...this.savedMessages.slice(index + 1),
+		];
+	}
+
+	handleMessageDelete(messageId: string): void {
+		this.savedMessages = this.savedMessages.filter((message) => message.id !== messageId);
+		this.missingSavedMessages = this.missingSavedMessages.filter((entry) => entry.id !== messageId);
+	}
+
+	handleMessageCreate(message: Message): void {
+		this.missingSavedMessages = this.missingSavedMessages.filter((entry) => entry.id !== message.id);
+		this.savedMessages = [new MessageRecord(message), ...this.savedMessages];
+	}
+
+	private updateMessageWithReaction(messageId: string, updater: (message: MessageRecord) => MessageRecord): void {
+		const index = this.savedMessages.findIndex((m) => m.id === messageId);
+		if (index === -1) return;
+
+		this.savedMessages = [
+			...this.savedMessages.slice(0, index),
+			updater(this.savedMessages[index]),
+			...this.savedMessages.slice(index + 1),
+		];
+	}
+
+	handleMessageReactionAdd(messageId: string, userId: string, emoji: ReactionEmoji): void {
+		this.updateMessageWithReaction(messageId, (message) =>
+			message.withReaction(emoji, true, userId === AuthenticationStore.currentUserId),
+		);
+	}
+
+	handleMessageReactionRemove(messageId: string, userId: string, emoji: ReactionEmoji): void {
+		this.updateMessageWithReaction(messageId, (message) =>
+			message.withReaction(emoji, false, userId === AuthenticationStore.currentUserId),
+		);
+	}
+
+	handleMessageReactionRemoveAll(messageId: string): void {
+		this.updateMessageWithReaction(messageId, (message) => message.withUpdates({reactions: []}));
+	}
+
+	handleMessageReactionRemoveEmoji(messageId: string, emoji: ReactionEmoji): void {
+		this.updateMessageWithReaction(messageId, (message) => message.withoutReactionEmoji(emoji));
+	}
+}
+
+export default new SavedMessagesStore();