feat: add Electric SQL replication for chat_comment_mentions

surfsense_web/hooks/use-mentions-electric.ts

@@ -0,0 +1,167 @@
+"use client";
+
+import { useEffect, useState, useRef } from "react";
+import { useElectricClient } from "@/lib/electric/context";
+import type { SyncHandle } from "@/lib/electric/client";
+
+export interface ElectricMention {
+	id: number;
+	comment_id: number;
+	mentioned_user_id: string;
+	created_at: string;
+}
+
+/**
+ * Hook for syncing mentions with Electric SQL for real-time updates.
+ * Syncs all mentions for the current user.
+ * @param userId - The user ID to sync mentions for
+ */
+export function useMentionsElectric(userId: string | null) {
+	const electricClient = useElectricClient();
+
+	const [mentions, setMentions] = useState<ElectricMention[]>([]);
+	const [loading, setLoading] = useState(true);
+	const [error, setError] = useState<Error | null>(null);
+	const syncHandleRef = useRef<SyncHandle | null>(null);
+	const liveQueryRef = useRef<{ unsubscribe: () => void } | null>(null);
+	const syncKeyRef = useRef<string | null>(null);
+
+	useEffect(() => {
+		if (!electricClient) {
+			setLoading(false);
+			setError(new Error("Electric SQL not configured"));
+			return;
+		}
+
+		if (!userId) {
+			setMentions([]);
+			setLoading(false);
+			return;
+		}
+
+		const syncKey = `mentions_${userId}`;
+		if (syncKeyRef.current === syncKey) {
+			return;
+		}
+
+		let mounted = true;
+		syncKeyRef.current = syncKey;
+
+		const client = electricClient;
+
+		async function startSync() {
+			try {
+				const handle = await client.syncShape({
+					table: "chat_comment_mentions",
+					where: `mentioned_user_id = '${userId}'`,
+					primaryKey: ["id"],
+				});
+
+				if (!handle.isUpToDate && handle.initialSyncPromise) {
+					try {
+						await Promise.race([
+							handle.initialSyncPromise,
+							new Promise((resolve) => setTimeout(resolve, 2000)),
+						]);
+					} catch (syncErr) {
+						console.error("[useMentionsElectric] Initial sync failed:", syncErr);
+					}
+				}
+
+				if (!mounted) {
+					handle.unsubscribe();
+					return;
+				}
+
+				syncHandleRef.current = handle;
+				setLoading(false);
+				setError(null);
+
+				await fetchMentions();
+				await setupLiveQuery();
+			} catch (err) {
+				if (!mounted) return;
+				console.error("[useMentionsElectric] Failed to start sync:", err);
+				setError(err instanceof Error ? err : new Error("Failed to sync mentions"));
+				setLoading(false);
+			}
+		}
+
+		async function fetchMentions() {
+			try {
+				const result = await client.db.query<ElectricMention>(
+					`SELECT id, comment_id, mentioned_user_id, created_at 
+					 FROM chat_comment_mentions 
+					 WHERE mentioned_user_id = $1 
+					 ORDER BY created_at DESC`,
+					[userId]
+				);
+				if (mounted) {
+					setMentions(result.rows || []);
+				}
+			} catch (err) {
+				console.error("[useMentionsElectric] Failed to fetch:", err);
+			}
+		}
+
+		async function setupLiveQuery() {
+			try {
+				// eslint-disable-next-line @typescript-eslint/no-explicit-any
+				const db = client.db as any;
+
+				if (db.live?.query && typeof db.live.query === "function") {
+					const liveQuery = await db.live.query(
+						`SELECT id, comment_id, mentioned_user_id, created_at 
+						 FROM chat_comment_mentions 
+						 WHERE mentioned_user_id = $1 
+						 ORDER BY created_at DESC`,
+						[userId]
+					);
+
+					if (!mounted) {
+						liveQuery.unsubscribe?.();
+						return;
+					}
+
+					if (liveQuery.initialResults?.rows) {
+						setMentions(liveQuery.initialResults.rows);
+					} else if (liveQuery.rows) {
+						setMentions(liveQuery.rows);
+					}
+
+					if (typeof liveQuery.subscribe === "function") {
+						liveQuery.subscribe((result: { rows: ElectricMention[] }) => {
+							if (mounted && result.rows) {
+								setMentions(result.rows);
+							}
+						});
+					}
+
+					if (typeof liveQuery.unsubscribe === "function") {
+						liveQueryRef.current = liveQuery;
+					}
+				}
+			} catch (liveErr) {
+				console.error("[useMentionsElectric] Failed to set up live query:", liveErr);
+			}
+		}
+
+		startSync();
+
+		return () => {
+			mounted = false;
+			syncKeyRef.current = null;
+
+			if (syncHandleRef.current) {
+				syncHandleRef.current.unsubscribe();
+				syncHandleRef.current = null;
+			}
+			if (liveQueryRef.current) {
+				liveQueryRef.current.unsubscribe();
+				liveQueryRef.current = null;
+			}
+		};
+	}, [userId, electricClient]);
+
+	return { mentions, loading, error };
+}