1// System prompt for high-quality RAG responses
2const systemPrompt = `
3You are a knowledgeable assistant answering questions from a knowledge base.
4
5CRITICAL RULES:
61. ONLY use information from the provided sources
72. If information is not in sources, say: "This information is not in our knowledge base"
83. ALWAYS cite sources using [Source N] format
94. Be accurate - do not infer beyond what sources say
105. Use Vietnamese for responses
116. Keep answers concise but complete
12
13RESPONSE FORMAT:
14- Start with direct answer
15- Provide supporting details
16- End with source citations
17- If multiple sources agree, mention all
18`;

1// OpenAI prompt with inline citations
2const prompt = `
3Sources:
4[1] ${chunks[0].content} (from: ${chunks[0].source})
5[2] ${chunks[1].content} (from: ${chunks[1].source})
6[3] ${chunks[2].content} (from: ${chunks[2].source})
7
8Question: ${query}
9
10Answer with inline citations [1], [2], etc.:`;
11
12// Example output:
13// "Chính sách hoàn trả cho phép trả hàng trong 30 ngày [1]. 
14//  Sản phẩm phải còn nguyên tem [2]."

1// Code node: Format response with source list
2const answer = $json.answer;
3const sources = $json.sources;
4
5const formattedResponse = `${answer}
6
7---
8**Sources:**
9${sources.map((s, i) => `${i + 1}. ${s.title} (relevance: ${(s.score * 100).toFixed(0)}%)`).join('\n')}`;
10
11return { json: { formattedResponse } };

1// Different templates for different question types
2const templates = {
3  factual: {
4    instruction: "Give a direct, concise answer with facts from sources.",
5    format: "Short answer + supporting evidence"
6  },
7  howTo: {
8    instruction: "Provide step-by-step instructions from the sources.",
9    format: "Numbered steps, each with source citation"
10  },
11  comparison: {
12    instruction: "Compare options based on information in sources.",
13    format: "Table or bullet comparison + recommendation"
14  },
15  summary: {
16    instruction: "Summarize the topic from all available sources.",
17    format: "Overview + key points + details"
18  }
19};
20
21// Auto-detect question type
22const detectPrompt = `
23Classify this question type: factual, howTo, comparison, or summary.
24Question: "${$json.query}"
25Type:`;

1// Code node: Calculate answer confidence
2function calculateConfidence(searchResults, answer) {
3  // Factor 1: Top retrieval score
4  const topScore = searchResults[0]?.score || 0;
5  
6  // Factor 2: Number of relevant results
7  const relevantCount = searchResults.filter(r => r.score > 0.7).length;
8  const coverageFactor = Math.min(relevantCount / 3, 1); // 3 results = full
9  
10  // Factor 3: Source agreement
11  const uniqueSources = new Set(searchResults.map(r => r.source)).size;
12  const agreementFactor = uniqueSources > 1 ? 1.1 : 1.0; // bonus for multi-source
13  
14  const confidence = Math.min(topScore * coverageFactor * agreementFactor, 1.0);
15  
16  return {
17    score: confidence,
18    level: confidence > 0.85 ? "high" : confidence > 0.6 ? "medium" : "low",
19    factors: { topScore, coverageFactor, uniqueSources }
20  };
21}

1// Code node: Handle different scenarios
2
3// No results found
4if ($json.results.length === 0) {
5  return { json: {
6    answer: "Xin lỗi, tôi không tìm thấy thông tin liên quan trong knowledge base.",
7    suggestion: "Bạn có thể thử hỏi cách khác hoặc liên hệ support team.",
8    confidence: 0
9  }};
10}
11
12// Low confidence results
13if ($json.results[0].score < 0.5) {
14  return { json: {
15    answer: "Tôi không chắc chắn về câu trả lời, nhưng đây là thông tin gần nhất tôi tìm được:",
16    partialAnswer: true,
17    confidence: "low"
18  }};
19}
20
21// Contradicting sources
22// Let AI acknowledge the contradiction
23const contradictionPrompt = `
24The sources contain potentially conflicting information:
25Source A: ${$json.results[0].content}
26Source B: ${$json.results[1].content}
27
28Acknowledge both perspectives in your answer.`;

1// For chat interfaces, stream responses
2// n8n AI Agent node supports streaming
3
4// Agent configuration:
5// - Output Type: Streaming
6// - This sends chunks as they are generated
7// - Better UX for long answers
8
9// Webhook response with streaming:
10// Response Mode: "Response Stream"