Initial commit: Edu Helper (Docker, React, Express, Prisma)

Made-with: Cursor

backend/src/routes/chat.ts

@@ -0,0 +1,83 @@
+import { Router, Response } from "express";
+import prisma from "../lib/prisma";
+import { getDeepSeekClient } from "../lib/deepseek";
+import type { AuthRequest } from "../middleware/auth";
+
+const router = Router();
+
+router.get("/history", async (req: AuthRequest, res: Response) => {
+  const studentId = req.studentId!;
+  const messages = await prisma.chatMessage.findMany({
+    where: { studentId },
+    orderBy: { createdAt: "asc" },
+    take: 100,
+  });
+  res.json(messages);
+});
+
+router.post("/", async (req: AuthRequest, res: Response) => {
+  const { message } = req.body;
+  const studentId = req.studentId!;
+
+  if (!message || typeof message !== "string") {
+    res.status(400).json({ error: "Message is required" });
+    return;
+  }
+
+  await prisma.chatMessage.create({
+    data: { role: "user", content: message, studentId },
+  });
+
+  const history = await prisma.chatMessage.findMany({
+    where: { studentId },
+    orderBy: { createdAt: "asc" },
+    take: 50,
+  });
+
+  const client = await getDeepSeekClient();
+
+  const messages = history.map((m: { role: string; content: string }) => ({
+    role: m.role as "user" | "assistant",
+    content: m.content,
+  }));
+
+  res.setHeader("Content-Type", "text/event-stream");
+  res.setHeader("Cache-Control", "no-cache");
+  res.setHeader("Connection", "keep-alive");
+
+  try {
+    const stream = await client.chat.completions.create({
+      model: "deepseek-chat",
+      messages,
+      stream: true,
+    });
+
+    let fullResponse = "";
+
+    for await (const chunk of stream) {
+      const content = chunk.choices[0]?.delta?.content || "";
+      if (content) {
+        fullResponse += content;
+        res.write(`data: ${JSON.stringify({ content })}\n\n`);
+      }
+    }
+
+    await prisma.chatMessage.create({
+      data: { role: "assistant", content: fullResponse, studentId },
+    });
+
+    res.write(`data: [DONE]\n\n`);
+    res.end();
+  } catch (err: any) {
+    res.write(`data: ${JSON.stringify({ error: err.message })}\n\n`);
+    res.end();
+  }
+});
+
+router.delete("/history", async (req: AuthRequest, res: Response) => {
+  const studentId = req.studentId!;
+  await prisma.chatMessage.deleteMany({ where: { studentId } });
+  res.json({ success: true });
+});
+
+export default router;