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import type { UIMessage } from "@ai-sdk/react"
import { create } from "zustand"
import { persist, createJSONStorage } from "zustand/middleware"
import { useCallback } from "react"
import { indexedDBStorage } from "./indexeddb-storage"
/**
* Deep equality check for UIMessage arrays to prevent unnecessary state updates
*/
export function areUIMessageArraysEqual(a: UIMessage[], b: UIMessage[]): boolean {
if (a === b) return true
if (a.length !== b.length) return false
for (let i = 0; i < a.length; i++) {
const msgA = a[i]
const msgB = b[i]
// Both messages should exist at this index
if (!msgA || !msgB) return false
if (msgA === msgB) continue
if (msgA.id !== msgB.id || msgA.role !== msgB.role) {
return false
}
// Compare the entire message using JSON serialization as a fallback
// This handles all properties including parts, toolInvocations, etc.
if (JSON.stringify(msgA) !== JSON.stringify(msgB)) {
return false
}
}
return true
}
export interface ConversationSummary {
id: string
title?: string
lastUpdated: string
}
interface ConversationRecord {
messages: UIMessage[]
title?: string
lastUpdated: string
}
interface ProjectConversationsState {
currentChatId: string | null
conversations: Record<string, ConversationRecord>
}
interface ConversationsStoreState {
byProject: Record<string, ProjectConversationsState>
setCurrentChatId: (projectId: string, chatId: string | null) => void
setConversation: (
projectId: string,
chatId: string,
messages: UIMessage[],
) => void
deleteConversation: (projectId: string, chatId: string) => void
setConversationTitle: (
projectId: string,
chatId: string,
title: string | undefined,
) => void
}
export const usePersistentChatStore = create<ConversationsStoreState>()(
persist(
(set, _get) => ({
byProject: {},
setCurrentChatId(projectId, chatId) {
set((state) => {
const project = state.byProject[projectId] ?? {
currentChatId: null,
conversations: {},
}
return {
byProject: {
...state.byProject,
[projectId]: { ...project, currentChatId: chatId },
},
}
})
},
setConversation(projectId, chatId, messages) {
const now = new Date().toISOString()
set((state) => {
const project = state.byProject[projectId] ?? {
currentChatId: null,
conversations: {},
}
const existing = project.conversations[chatId]
// Check if messages are actually different to prevent unnecessary updates
if (
existing &&
areUIMessageArraysEqual(existing.messages, messages)
) {
return state // No change needed
}
const shouldTouchLastUpdated = (() => {
if (!existing) return messages.length > 0
const previousLength = existing.messages?.length ?? 0
return messages.length > previousLength
})()
const record: ConversationRecord = {
messages,
title: existing?.title,
lastUpdated: shouldTouchLastUpdated
? now
: (existing?.lastUpdated ?? now),
}
return {
byProject: {
...state.byProject,
[projectId]: {
currentChatId: project.currentChatId,
conversations: {
...project.conversations,
[chatId]: record,
},
},
},
}
})
},
deleteConversation(projectId, chatId) {
set((state) => {
const project = state.byProject[projectId] ?? {
currentChatId: null,
conversations: {},
}
const { [chatId]: _, ...rest } = project.conversations
const nextCurrent =
project.currentChatId === chatId ? null : project.currentChatId
return {
byProject: {
...state.byProject,
[projectId]: { currentChatId: nextCurrent, conversations: rest },
},
}
})
},
setConversationTitle(projectId, chatId, title) {
const now = new Date().toISOString()
set((state) => {
const project = state.byProject[projectId] ?? {
currentChatId: null,
conversations: {},
}
const existing = project.conversations[chatId]
if (!existing) return { byProject: state.byProject }
return {
byProject: {
...state.byProject,
[projectId]: {
currentChatId: project.currentChatId,
conversations: {
...project.conversations,
[chatId]: { ...existing, title, lastUpdated: now },
},
},
},
}
})
},
}),
{
name: "supermemory-chats",
storage: createJSONStorage(() => indexedDBStorage),
},
),
)
// Always scoped to the current project via useProject
import { useProject } from "."
export function usePersistentChat() {
const { selectedProject } = useProject()
const projectId = selectedProject
const projectState = usePersistentChatStore((s) => s.byProject[projectId])
const setCurrentChatIdRaw = usePersistentChatStore((s) => s.setCurrentChatId)
const setConversationRaw = usePersistentChatStore((s) => s.setConversation)
const deleteConversationRaw = usePersistentChatStore(
(s) => s.deleteConversation,
)
const setConversationTitleRaw = usePersistentChatStore(
(s) => s.setConversationTitle,
)
const conversations: ConversationSummary[] = (() => {
const convs = projectState?.conversations ?? {}
return Object.entries(convs).map(([id, rec]) => ({
id,
title: rec.title,
lastUpdated: rec.lastUpdated,
}))
})()
const currentChatId = projectState?.currentChatId ?? null
const setCurrentChatId = useCallback(
(chatId: string | null): void => {
setCurrentChatIdRaw(projectId, chatId)
},
[projectId, setCurrentChatIdRaw],
)
const setConversation = useCallback(
(chatId: string, messages: UIMessage[]): void => {
setConversationRaw(projectId, chatId, messages)
},
[projectId, setConversationRaw],
)
const deleteConversation = useCallback(
(chatId: string): void => {
deleteConversationRaw(projectId, chatId)
},
[projectId, deleteConversationRaw],
)
const setConversationTitle = useCallback(
(chatId: string, title: string | undefined): void => {
setConversationTitleRaw(projectId, chatId, title)
},
[projectId, setConversationTitleRaw],
)
const getCurrentConversation = useCallback((): UIMessage[] | undefined => {
const convs = projectState?.conversations ?? {}
const id = currentChatId
if (!id) return undefined
return convs[id]?.messages
}, [projectState?.conversations, currentChatId])
const getCurrentChat = useCallback((): ConversationSummary | undefined => {
const id = currentChatId
if (!id) return undefined
const rec = projectState?.conversations?.[id]
if (!rec) return undefined
return { id, title: rec.title, lastUpdated: rec.lastUpdated }
}, [currentChatId, projectState?.conversations])
return {
conversations,
currentChatId,
setCurrentChatId,
setConversation,
deleteConversation,
setConversationTitle,
getCurrentConversation,
getCurrentChat,
}
}
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