AI-Powered Quiz Generator

// Quiz generation prompt template with Bloom's Taxonomy
export function buildQuizPrompt(params: {
  content: string;
  numQuestions: number;
  difficulty: 1 | 2 | 3 | 4 | 5;
  questionTypes: ("mcq" | "true_false" | "short_answer")[];
}) {
  const bloomLevel = {
    1: "Remember — recall facts and basic concepts",
    2: "Understand — explain ideas or concepts",
    3: "Apply — use information in new situations",
    4: "Analyze — draw connections among ideas",
    5: "Evaluate — justify a stand or decision",
  }[params.difficulty];

  return `You are an expert educational assessment designer.
Generate ${params.numQuestions} quiz questions from the
provided content.

BLOOM'S TAXONOMY LEVEL: ${bloomLevel}
QUESTION TYPES: ${params.questionTypes.join(", ")}

RULES:
- Each question must be directly supported by the content
- MCQs must have exactly 4 options with 1 correct answer
- Include a brief explanation for the correct answer
- Vary question difficulty within the specified Bloom's level
- Avoid ambiguous or trick questions

CONTENT:
${params.content}

Respond in this exact JSON format:
{
  "questions": [
    {
      "type": "mcq",
      "question": "...",
      "options": ["A) ...", "B) ...", "C) ...", "D) ..."],
      "correct_answer": "A",
      "explanation": "...",
      "bloom_level": "Remember"
    }
  ]
}`;
}

import { NextRequest, NextResponse } from "next/server";
import { buildQuizPrompt } from "@/lib/prompts/quiz-generator";

export async function POST(req: NextRequest) {
  try {
    const body = await req.json();
    const { content, numQuestions, difficulty, questionTypes } = body;

    // Validate inputs
    if (!content || content.length < 50) {
      return NextResponse.json(
        { error: "Content must be at least 50 characters" },
        { status: 400 }
      );
    }

    // Build prompt and call OpenAI
    const prompt = buildQuizPrompt({
      content,
      numQuestions: numQuestions || 5,
      difficulty: difficulty || 3,
      questionTypes: questionTypes || ["mcq"],
    });

    const response = await fetch(
      "https://api.openai.com/v1/chat/completions",
      {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
          Authorization: `Bearer ${process.env.OPENAI_API_KEY}`,
        },
        body: JSON.stringify({
          model: "gpt-4o",
          messages: [{ role: "user", content: prompt }],
          temperature: 0.7,
          response_format: { type: "json_object" },
        }),
      }
    );

    const data = await response.json();
    const quiz = JSON.parse(
      data.choices[0].message.content
    );

    return NextResponse.json(quiz);
  } catch (error) {
    console.error("Quiz generation error:", error);
    return NextResponse.json(
      { error: "Failed to generate quiz" },
      { status: 500 }
    );
  }
}