Support creating chats. Add agents in sidebar. Improve chat state management

frontend-vue/src/backend.js

@@ -16,7 +16,8 @@ let backendUrl = null;
 let nextNonce = 0;
 let reconnectTimeout = null; // For managing the reconnect timer
 let cache = {
-  chat: null,
+  chats: null,
+  agents: null,
 };
 
 // Auth
@@ -256,10 +257,24 @@ export async function getChat(chatId) {
   return allChats.find(chat => chat.id === chatId) || null;
 }
 
-export function invalidateCache({ chat = false } = {}) {
-  if (chat) {
-    cache.chats = null;
+export async function getAgents() {
+  if (cache.agents === null) {
+    const response = await sendAction("get-agents", {});
+    if (response && response.agents) {
+      cache.agents = response.agents.map(msg => ({
+        id: msg.id,
+        name: msg.name?.length > 0 ? msg.name : `<agent-${msg.id}>`,
+      }));
+    } else {
+      throw new Error("Invalid response for get-agents: " + JSON.stringify(response));
+    }
   }
+  return cache.agents;
+}
+
+export function invalidateCache({ chats=false, agents=false } = {}) {
+  if (chats) cache.chats = null;
+  if (agents) cache.agents = null;
 }
 
 

frontend-vue/src/components/main/Sidebar.vue

@@ -14,8 +14,11 @@
   const agents = ref([]);
 
   onMounted(async () => {
-    chats.value = (await backend.getChats()).map(entry => {
-      return {id: entry.id, name: entry.name};
+    chats.value = (await backend.getChats()).map(it => {
+      return {id: it.id, name: it.name};
+    });
+    agents.value = (await backend.getAgents()).map(it => {
+      return {id: it.id, name: it.name};
     });
   });
 </script>
@@ -35,10 +38,13 @@
       </li>
       <li><i class="fa-solid fa-angles-left"></i></li>
     </ul>
-    <nav>
-      <RouterLink v-if="mode=='chats'" v-for="it in chats" :to="'/chat/' + it.id" class="nav-item">{{it.name}}</RouterLink>
-
-      <RouterLink v-if="mode=='agents'" v-for="it in agents" :to="'/agent/' + it.id" class="nav-item">{{it.name}}</RouterLink>
+    <nav v-if="mode=='chats'">
+      <RouterLink v-for="it in chats" :to="'/chat/' + it.id" class="nav-item">{{it.name}}</RouterLink>
+      <RouterLink to="/chat/create" class="nav-item">Create Chat</RouterLink>
+    </nav>
+    <nav v-if="mode=='agents'">
+      <RouterLink v-for="it in agents" :to="'/agent/' + it.id" class="nav-item">{{it.name}}</RouterLink>
+      <RouterLink to="/agent/create" class="nav-item">Create Agent</RouterLink>
     </nav>
   </aside>
 </template>

frontend-vue/src/router/index.js

@@ -28,6 +28,11 @@ const router = createRouter({
       // which is lazy-loaded when the route is visited.
       component: () => import('../views/AboutView.vue'),
     },
+    {
+      name: 'chat-create',
+      path: `/chat/create`,
+      component: () => import('../views/ChatCreate.vue')
+    },
     objectView('chat', () => import('../views/Chat.vue')),
   ],
 })

frontend-vue/src/ui.js

@@ -1,7 +1,9 @@
 // Global utility functions related with UI functionality
 
+import router from './router'
+
 export function goto (path) {
-    window.location.hash = "#" + path;
+    router.push(path);
 }
 
 export async function confirm (prompt) {

frontend-vue/src/views/Chat.vue

@@ -1,6 +1,6 @@
 <script setup>
   import {
-    ref, computed, reactive,
+    ref, watch,
     onMounted, onUnmounted,
   } from "vue";
 
@@ -24,16 +24,73 @@
   const editingMessageId = ref(null);
   const noteMode = ref(false);
 
+  let _isMounted = false;
   let unsubscribeChat = null;
 
 
+  // === State Management === //
+
+  async function loadChatState (chatId) {
+    unsubscribeChat = backend.onChatMessages(chatId, it => {
+      if (it.sender == 'user') return;
+
+      addMessage({
+        type: it.kind,
+        sender: it.sender,
+        content: it.content,
+        threadId: it.threadId,
+      });
+    });
+
+    let response = await backend.sendAction("get-chat-messages", {chatId});
+    // Always good to duplicate when assigning to a ref
+    messages.value = response['messages'].map(it => ({
+      type: it.kind,
+      sender: it.sender,
+      content: it.content,
+      threadId: it.threadId,
+    }));
+
+    // This must happen on the same async-thread that sets `messages`
+    requestRescroll({forceBottom: true});
+
+    // Reset UI State
+    editingMessageId.value = null;
+    noteMode.value = false;
+    // no need to reset expandedThreads, it's nice that it will be remembered
+  }
+
+  async function unloadChatState () {
+    if (unsubscribeChat) unsubscribeChat();
+    unsubscribeChat = null;
+  }
+
+  // This won't fire when called, the mounted callback will take care
+  watch(() => props.id, newChatId => {
+    if (_isMounted) {
+      unloadChatState();
+      loadChatState(newChatId);
+    }
+  })
+
+  onMounted(async () => {
+    _isMounted = true;
+    loadChatState(props.id);
+  });
+
+  onUnmounted(async () => {
+    _isMounted = false;
+    unloadChatState();
+  });
+
+
   // === Chat Functionality === //
 
   const inputFieldElem = ref(null);
   const chatContainerElem = ref(null);
 
-  async function getChatMessages() {
-    let response = await backend.sendAction("get-chat-messages", {'chatId': props.id});
+  async function getChatMessages(chatId) {
+    let response = await backend.sendAction("get-chat-messages", {chatId});
     let messageObjects = response['messages'];
     return messageObjects;
   }
@@ -97,7 +154,7 @@
 
   // === UI Helper Functions === //
 
-  function requestRescroll () {
+  function requestRescroll ({forceBottom=false, bottomRelative=false}) {
     const elem = chatContainerElem.value;
 
     const scroll = elem.scrollTop;
@@ -107,7 +164,7 @@
     window.requestAnimationFrame(() => {
       window.requestAnimationFrame(() => {
         // Chat was fully scrolled down
-        if (scroll == max) {
+        if (forceBottom || scroll == max) {
           elem.scrollTop = elem.scrollTopMax;
         } else {
           // Do nothing, scroll remains in place
@@ -133,39 +190,6 @@
     }
   }
 
-  // === Initialize === //
-
-  onMounted(async () => {
-    requestRescroll();
-
-    messages.value = (await getChatMessages()).map(it => {
-      return {
-        type: it.kind,
-        sender: it.sender,
-        content: it.content,
-        threadId: it.threadId,
-      };
-    });
-
-    if (unsubscribeChat) unsubscribeChat();
-    unsubscribeChat = backend.onChatMessages(props.id, it => {
-      if (it.sender == 'user') return;
-
-      addMessage({
-        type: it.kind,
-        sender: it.sender,
-        content: it.content,
-        threadId: it.threadId,
-      });
-    });
-  });
-
-  onMounted(async () => {
-    if (unsubscribeChat) {
-      unsubscribeChat();
-      unsubscribeChat = null;
-    }
-  });
 </script>
 
 <template>

frontend-vue/src/views/ChatCreate.vue

@@ -0,0 +1,83 @@
+<script setup>
+  import {
+    ref, computed, reactive,
+    onMounted, onUnmounted,
+  } from "vue";
+
+  import * as backend from '../backend';
+  import * as ui from '../ui';
+
+  // List of agents, with their id, name, and whether they're currently selected
+  const agents = ref([
+    {id: 1, name: "John"},
+    {id: 2, name: "Steve"},
+  ]);
+  const title = ref("");
+
+  async function submitChat () {
+    const selectedAgents = agents.value.filter(agent => agent.selected).map(agent => agent.id);
+
+    let response = await backend.sendAction("create-chat", {
+      'name': title.value,
+      'members': selectedAgents,
+    });
+
+    if (response.error) {
+      ui.alert(`Could not create chat\n${response.error}`);
+    } else {
+      ui.alert(`Created Chat "${title.value}"`);
+      backend.invalidateCache({chats: true});
+      ui.goto(`/chat/${response.chatId}`);
+    }
+  }
+
+  // === Initialize === //
+
+  onMounted(async () => {
+    agents.value = (await backend.getAgents()).map(it => ({
+      id: it.id,
+      name: it.name,
+      selected: false,
+    }));
+    // TODO: Get agent list
+  });
+</script>
+
+<template>
+  <main>
+    <h1>Create New Chat</h1>
+
+    <div class="main-container">
+      <input v-model="title" type="text" placeholder="title">
+      <div class="multi-select-box">
+        <div v-for="agent in agents" :class="{selected: Boolean(agent.selected)}" @click="agent.selected = !agent.selected">{{agent.name}}</div>
+      </div>
+      <button @click="submitChat()">Create Chat</button>
+    </div>
+  </main>
+</template>
+
+<style scoped>
+  .main-container {
+    display: flex;
+    flex-direction: column;
+  }
+
+  .multi-select-box {
+    border: 1px solid var(--color-border);
+    border-radius: var(--border-radius);
+  }
+
+  .multi-select-box div {
+    border-bottom: 1px solid var(--color-border);
+  }
+  .multi-select-box div:last {
+    border-bottom: none;
+  }
+  .multi-select-box div:hover {
+    background-color: var(--color-background-mute);
+  }
+  .multi-select-box div.selected {
+    background-color: var(--color-background-soft);
+  }
+</style>