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import { invoke } from "@tauri-apps/api/core";
import { listen, type UnlistenFn } from "@tauri-apps/api/event";
import { create } from "zustand";
import type { GenerationStats, StreamChunk } from "@/types/bindings/assistant";
export interface Message {
role: "user" | "assistant" | "system";
content: string;
stats?: GenerationStats;
}
interface AssistantState {
// State
messages: Message[];
isProcessing: boolean;
isProviderHealthy: boolean | undefined;
streamingContent: string;
initialized: boolean;
streamUnlisten: UnlistenFn | null;
// Actions
init: () => Promise<void>;
checkHealth: () => Promise<void>;
sendMessage: (
content: string,
isEnabled: boolean,
provider: string,
endpoint: string,
) => Promise<void>;
finishStreaming: () => void;
clearHistory: () => void;
setMessages: (messages: Message[]) => void;
setIsProcessing: (isProcessing: boolean) => void;
setIsProviderHealthy: (isProviderHealthy: boolean | undefined) => void;
setStreamingContent: (streamingContent: string) => void;
}
export const useAssistantStore = create<AssistantState>((set, get) => ({
// Initial state
messages: [],
isProcessing: false,
isProviderHealthy: false,
streamingContent: "",
initialized: false,
streamUnlisten: null,
// Actions
init: async () => {
const { initialized } = get();
if (initialized) return;
set({ initialized: true });
await get().checkHealth();
},
checkHealth: async () => {
try {
const isHealthy = await invoke<boolean>("assistant_check_health");
set({ isProviderHealthy: isHealthy });
} catch (e) {
console.error("Failed to check provider health:", e);
set({ isProviderHealthy: false });
}
},
finishStreaming: () => {
const { streamUnlisten } = get();
set({ isProcessing: false, streamingContent: "" });
if (streamUnlisten) {
streamUnlisten();
set({ streamUnlisten: null });
}
},
sendMessage: async (content, isEnabled, provider, endpoint) => {
if (!content.trim()) return;
const { messages } = get();
if (!isEnabled) {
const newMessage: Message = {
role: "assistant",
content: "Assistant is disabled. Enable it in Settings > AI Assistant.",
};
set({ messages: [...messages, { role: "user", content }, newMessage] });
return;
}
// Add user message
const userMessage: Message = { role: "user", content };
const updatedMessages = [...messages, userMessage];
set({
messages: updatedMessages,
isProcessing: true,
streamingContent: "",
});
// Add empty assistant message for streaming
const assistantMessage: Message = { role: "assistant", content: "" };
const withAssistantMessage = [...updatedMessages, assistantMessage];
set({ messages: withAssistantMessage });
try {
// Set up stream listener
const unlisten = await listen<StreamChunk>(
"assistant-stream",
(event) => {
const chunk = event.payload;
const currentState = get();
if (chunk.content) {
const newStreamingContent =
currentState.streamingContent + chunk.content;
const currentMessages = [...currentState.messages];
const lastIdx = currentMessages.length - 1;
if (lastIdx >= 0 && currentMessages[lastIdx].role === "assistant") {
currentMessages[lastIdx] = {
...currentMessages[lastIdx],
content: newStreamingContent,
};
set({
streamingContent: newStreamingContent,
messages: currentMessages,
});
}
}
if (chunk.done) {
const finalMessages = [...currentState.messages];
const lastIdx = finalMessages.length - 1;
if (
chunk.stats &&
lastIdx >= 0 &&
finalMessages[lastIdx].role === "assistant"
) {
finalMessages[lastIdx] = {
...finalMessages[lastIdx],
stats: chunk.stats,
};
set({ messages: finalMessages });
}
get().finishStreaming();
}
},
);
set({ streamUnlisten: unlisten });
// Start streaming chat
await invoke<string>("assistant_chat_stream", {
messages: withAssistantMessage.slice(0, -1), // Exclude the empty assistant message
});
} catch (e) {
console.error("Failed to send message:", e);
const errorMessage = e instanceof Error ? e.message : String(e);
let helpText = "";
if (provider === "ollama") {
helpText = `\n\nPlease ensure Ollama is running at ${endpoint}.`;
} else if (provider === "openai") {
helpText = "\n\nPlease check your OpenAI API key in Settings.";
}
// Update the last message with error
const currentMessages = [...get().messages];
const lastIdx = currentMessages.length - 1;
if (lastIdx >= 0 && currentMessages[lastIdx].role === "assistant") {
currentMessages[lastIdx] = {
role: "assistant",
content: `Error: ${errorMessage}${helpText}`,
};
set({ messages: currentMessages });
}
get().finishStreaming();
}
},
clearHistory: () => {
set({ messages: [], streamingContent: "" });
},
setMessages: (messages) => {
set({ messages });
},
setIsProcessing: (isProcessing) => {
set({ isProcessing });
},
setIsProviderHealthy: (isProviderHealthy) => {
set({ isProviderHealthy });
},
setStreamingContent: (streamingContent) => {
set({ streamingContent });
},
}));
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