fix(chat): handle agent and session state changes properly

update activeAgentId type to allow null and reset state when deleting agent
add validation for missing agent/session in UI components

src/renderer/src/hooks/agents/useAgents.ts

@@ -1,9 +1,12 @@
+import { useAppDispatch } from '@renderer/store'
+import { setActiveAgentId, setActiveSessionIdAction } from '@renderer/store/runtime'
 import { AddAgentForm } from '@renderer/types'
 import { formatErrorMessageWithPrefix } from '@renderer/utils/error'
 import { useCallback } from 'react'
 import { useTranslation } from 'react-i18next'
 import useSWR from 'swr'
 
+import { useRuntime } from '../useRuntime'
 import { useAgentClient } from './useAgentClient'
 
 export const useAgents = () => {
@@ -16,6 +19,9 @@ export const useAgents = () => {
     return result.data
   }, [client])
   const { data, error, isLoading, mutate } = useSWR(key, fetcher)
+  const { chat } = useRuntime()
+  const { activeAgentId } = chat
+  const dispatch = useAppDispatch()
 
   const addAgent = useCallback(
     async (form: AddAgentForm) => {
@@ -34,6 +40,15 @@ export const useAgents = () => {
     async (id: string) => {
       try {
         await client.deleteAgent(id)
+        dispatch(setActiveSessionIdAction({ agentId: id, sessionId: null }))
+        if (activeAgentId === id) {
+          const newId = data?.filter((a) => a.id !== id).find(() => true)?.id
+          if (newId) {
+            dispatch(setActiveAgentId(newId))
+          } else {
+            dispatch(setActiveAgentId(null))
+          }
+        }
         mutate((prev) => prev?.filter((a) => a.id !== id) ?? [])
         window.toast.success(t('common.delete_success'))
       } catch (error) {

src/renderer/src/pages/home/Chat.tsx

@@ -18,7 +18,7 @@ import { classNames } from '@renderer/utils'
 import { Flex } from 'antd'
 import { debounce } from 'lodash'
 import { AnimatePresence, motion } from 'motion/react'
-import React, { FC, useMemo, useState } from 'react'
+import React, { FC, useCallback, useMemo, useState } from 'react'
 import { useHotkeys } from 'react-hotkeys-hook'
 import { useTranslation } from 'react-i18next'
 import styled from 'styled-components'
@@ -172,6 +172,27 @@ const Chat: FC<Props> = (props) => {
     return () => <AgentSessionInputbar agentId={activeAgentId} sessionId={sessionId} />
   }, [activeAgentId, activeSessionId])
 
+  // TODO: more info
+  const AgentInvalid = useCallback(() => {
+    return (
+      <div className="flex h-full w-full items-center justify-center">
+        <div>
+          <Alert color="warning" title="Select an agent" />
+        </div>
+      </div>
+    )
+  }, [])
+
+  // TODO: more info
+  const SessionInvalid = useCallback(() => {
+    return (
+      <div className="flex h-full w-full items-center justify-center">
+        <div>
+          <Alert color="warning" title="Create a session" />
+        </div>
+      </div>
+    )
+  }, [])
   return (
     <Container id="chat" className={classNames([messageStyle, { 'multi-select-mode': isMultiSelectMode }])}>
       {isTopNavbar && (
@@ -213,7 +234,11 @@ const Chat: FC<Props> = (props) => {
                 <Inputbar assistant={assistant} setActiveTopic={props.setActiveTopic} topic={props.activeTopic} />
               </>
             )}
-            {activeTopicOrSession === 'session' && (
+            {activeTopicOrSession === 'session' && !activeAgentId && <AgentInvalid />}
+            {activeTopicOrSession === 'session' && activeAgentId && !activeSessionId[activeAgentId] && (
+              <SessionInvalid />
+            )}
+            {activeTopicOrSession === 'session' && activeAgentId && activeSessionId[activeAgentId] && (
               <>
                 <SessionMessages />
                 <SessionInputBar />

src/renderer/src/pages/home/Tabs/SessionsTab.tsx

@@ -1,4 +1,4 @@
-import { Alert, cn, Spinner } from '@heroui/react'
+import { Alert, cn } from '@heroui/react'
 import { useRuntime } from '@renderer/hooks/useRuntime'
 import { useSettings } from '@renderer/hooks/useSettings'
 import { AnimatePresence, motion } from 'framer-motion'
@@ -24,6 +24,14 @@ const SessionsTab: FC<SessionsTabProps> = () => {
     )
   }
 
+  if (!activeAgentId) {
+    return (
+      <div>
+        <Alert color="warning" title={'Select an agent'} />
+      </div>
+    )
+  }
+
   return (
     <AnimatePresence mode="wait">
       <motion.div
@@ -35,26 +43,7 @@ const SessionsTab: FC<SessionsTabProps> = () => {
           'overflow-hidden',
           topicPosition === 'right' && navbarPosition === 'top' ? 'rounded-l-2xl border-t border-b border-l' : undefined
         )}>
-        {!activeAgentId ? (
-          <motion.div
-            key="loading"
-            initial={{ opacity: 0 }}
-            animate={{ opacity: 1 }}
-            exit={{ opacity: 0 }}
-            transition={{ duration: 0.3 }}
-            className="flex h-full flex-col items-center justify-center gap-3">
-            <Spinner size="lg" color="primary" />
-            <motion.p
-              initial={{ opacity: 0, y: 5 }}
-              animate={{ opacity: 1, y: 0 }}
-              transition={{ delay: 0.2, duration: 0.3 }}
-              className="text-foreground-500 text-sm">
-              {t('common.loading')}...
-            </motion.p>
-          </motion.div>
-        ) : (
-          <Sessions agentId={activeAgentId} />
-        )}
+        <Sessions agentId={activeAgentId} />
       </motion.div>
     </AnimatePresence>
   )

src/renderer/src/store/runtime.ts

@@ -158,7 +158,7 @@ const runtimeSlice = createSlice({
       // @ts-ignore ts2589 false positive
       state.chat.activeTopic = action.payload
     },
-    setActiveAgentId: (state, action: PayloadAction<string>) => {
+    setActiveAgentId: (state, action: PayloadAction<string | null>) => {
       state.chat.activeAgentId = action.payload
     },
     setActiveSessionIdAction: (state, action: PayloadAction<{ agentId: string; sessionId: string | null }>) => {