AI module - init

apps/client/src/ee/ai/hooks/use-ai.ts

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+import { useState, useCallback, useRef } from "react";
+import { useAiGenerateStreamMutation } from "@/ee/ai/queries/ai-query.ts";
+import { AiGenerateDto } from "@/ee/ai/types/ai.types.ts";
+
+export function useAiStream() {
+  const [content, setContent] = useState("");
+  const [isStreaming, setIsStreaming] = useState(false);
+  const abortControllerRef = useRef<AbortController | null>(null);
+  const mutation = useAiGenerateStreamMutation();
+
+  const startStream = useCallback(
+    async (data: AiGenerateDto) => {
+      setContent("");
+      setIsStreaming(true);
+
+      try {
+        const controller = await mutation.mutateAsync({
+          ...data,
+          onChunk: (chunk) => {
+            setContent((prev) => prev + chunk.content);
+          },
+          onError: (error) => {
+            console.error("AI stream error:", error);
+            setIsStreaming(false);
+          },
+          onComplete: () => {
+            setIsStreaming(false);
+          },
+        });
+
+        abortControllerRef.current = controller;
+      } catch (error) {
+        console.error("Failed to start stream:", error);
+        setIsStreaming(false);
+      }
+    },
+    [mutation]
+  );
+
+  const stopStream = useCallback(() => {
+    if (abortControllerRef.current) {
+      abortControllerRef.current.abort();
+      abortControllerRef.current = null;
+      setIsStreaming(false);
+    }
+  }, []);
+
+  const resetContent = useCallback(() => {
+    setContent("");
+  }, []);
+
+  return {
+    content,
+    isStreaming,
+    startStream,
+    stopStream,
+    resetContent,
+    isLoading: mutation.isPending,
+    error: mutation.error,
+  };
+}

apps/client/src/ee/ai/queries/ai-query.ts

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+import {
+  useMutation,
+  UseMutationResult,
+  useQuery,
+  UseQueryResult,
+} from "@tanstack/react-query";
+import {
+  generateAiContent,
+  generateAiContentStream,
+  getAiConfig,
+} from "@/ee/ai/services/ai-service.ts";
+import {
+  AiConfigResponse,
+  AiContentResponse,
+  AiGenerateDto,
+  AiStreamChunk,
+  AiStreamError,
+} from "@/ee/ai/types/ai.types.ts";
+
+export function useAiGenerateMutation(): UseMutationResult<
+  AiContentResponse,
+  Error,
+  AiGenerateDto
+> {
+  return useMutation({
+    mutationFn: (data: AiGenerateDto) => generateAiContent(data),
+  });
+}
+
+interface StreamCallbacks {
+  onChunk: (chunk: AiStreamChunk) => void;
+  onError?: (error: AiStreamError) => void;
+  onComplete?: () => void;
+}
+
+export function useAiGenerateStreamMutation(): UseMutationResult<
+  AbortController,
+  Error,
+  AiGenerateDto & StreamCallbacks
+> {
+  return useMutation({
+    mutationFn: ({ onChunk, onError, onComplete, ...data }) =>
+      generateAiContentStream(data, onChunk, onError, onComplete),
+  });
+}

apps/client/src/ee/ai/services/ai-service.ts

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+import api from "@/lib/api-client.ts";
+import {
+  AiGenerateDto,
+  AiContentResponse,
+  AiStreamChunk,
+  AiStreamError,
+} from "@/ee/ai/types/ai.types.ts";
+
+export async function generateAiContent(
+  data: AiGenerateDto,
+): Promise<AiContentResponse> {
+  const req = await api.post<AiContentResponse>("/ai/generate", data);
+  return req.data;
+}
+
+export async function generateAiContentStream(
+  data: AiGenerateDto,
+  onChunk: (chunk: AiStreamChunk) => void,
+  onError?: (error: AiStreamError) => void,
+  onComplete?: () => void,
+): Promise<AbortController> {
+  const abortController = new AbortController();
+  try {
+    const response = await fetch("/api/ai/generate/stream", {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify(data),
+      signal: abortController.signal,
+      credentials: "include", // This ensures cookies are sent, matching axios withCredentials
+    });
+
+    if (!response.ok) {
+      throw new Error(`HTTP error! status: ${response.status}`);
+    }
+
+    const reader = response.body?.getReader();
+    const decoder = new TextDecoder();
+
+    if (!reader) {
+      throw new Error("Response body is not readable");
+    }
+
+    const processStream = async () => {
+      try {
+        while (true) {
+          const { done, value } = await reader.read();
+          if (done) break;
+
+          const chunk = decoder.decode(value, { stream: true });
+          const lines = chunk.split("\n");
+
+          for (const line of lines) {
+            if (line.startsWith("data: ")) {
+              const data = line.slice(6);
+              if (data === "[DONE]") {
+                onComplete?.();
+                return;
+              }
+              try {
+                const parsed = JSON.parse(data);
+                if (parsed.error) {
+                  onError?.(parsed);
+                } else {
+                  onChunk(parsed);
+                }
+              } catch (e) {
+                // Ignore parse errors for incomplete chunks
+              }
+            }
+          }
+        }
+      } catch (error) {
+        if (error.name !== "AbortError") {
+          onError?.({ error: error.message });
+        }
+      } finally {
+        reader.releaseLock();
+      }
+    };
+
+    processStream();
+  } catch (error) {
+    onError?.({ error: error.message });
+  }
+
+  return abortController;
+}

apps/client/src/ee/ai/types/ai.types.ts

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+export enum AiAction {
+  IMPROVE_WRITING = "improve_writing",
+  FIX_SPELLING_GRAMMAR = "fix_spelling_grammar",
+  MAKE_SHORTER = "make_shorter",
+  MAKE_LONGER = "make_longer",
+  SIMPLIFY = "simplify",
+  CHANGE_TONE = "change_tone",
+  SUMMARIZE = "summarize",
+  CONTINUE_WRITING = "continue_writing",
+  TRANSLATE = "translate",
+  CUSTOM = "custom",
+}
+
+export interface AiGenerateDto {
+  action?: AiAction;
+  content: string;
+  prompt?: string;
+}
+
+export interface AiContentResponse {
+  content: string;
+  usage?: {
+    promptTokens: number;
+    completionTokens: number;
+    totalTokens: number;
+  };
+}
+
+export interface AiConfigResponse {
+  configured: boolean;
+  availableActions: AiAction[];
+}
+
+export interface AiStreamChunk {
+  content: string;
+}
+
+export interface AiStreamError {
+  error: string;
+}