backend/services/ai.js

const GROQ_API_KEY = process.env.GROQ_API_KEY;
const OLLAMA_URL = process.env.OLLAMA_URL || 'http://localhost:11434';
const GROQ_MODEL = process.env.GROQ_MODEL || 'llama-3.3-70b-versatile';
const OLLAMA_MODEL = process.env.OLLAMA_MODEL || 'llama3.2:3b';

async function callAI(prompt) {
  if (GROQ_API_KEY) {
    const res = await fetch('https://api.groq.com/openai/v1/chat/completions', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', 'Authorization': `Bearer ${GROQ_API_KEY}` },
      body: JSON.stringify({ model: GROQ_MODEL, messages: [{ role: 'user', content: prompt }], temperature: 0.7, max_tokens: 4096 }),
    });
    if (res.ok) { const data = await res.json(); return data.choices[0].message.content; }
    console.warn('Groq failed, falling back to Ollama...');
  }
  const res = await fetch(`${OLLAMA_URL}/api/generate`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ model: OLLAMA_MODEL, prompt, stream: false }),
  });
  if (!res.ok) throw new Error('Both Groq and Ollama failed.');
  return (await res.json()).response;
}

function parseJSON(text) {
  try { return JSON.parse(text.trim()); }
  catch { const m = text.match(/\{[\s\S]*\}/); if (m) return JSON.parse(m[0]); throw new Error('Failed to parse AI response'); }
}

async function settleArgument(topic, side1Name, side1Argument, side2Name, side2Argument) {
  const text = await callAI(`You are "The Settler" - a world-class debate judge with expertise in logic, rhetoric, and critical thinking. You combine the analytical rigor of a philosophy professor with the wit of a late-night show host.

TOPIC: ${topic}

${side1Name}'s ARGUMENT:
${side1Argument}

${side2Name}'s ARGUMENT:
${side2Argument}

Perform a DEEP analysis of both arguments. Check for:
- Logical fallacies (ad hominem, straw man, false dichotomy, appeal to authority, slippery slope, etc.)
- Evidence quality (anecdotal, statistical, expert opinion, common sense)
- Emotional vs rational reasoning balance
- Bias and assumptions
- Argument structure and coherence

Return ONLY valid JSON:
{
  "topic": "<topic summary>",
  "side1": {
    "name": "${side1Name}",
    "score": <1-100>,
    "persuasivenessScore": <1-100>,
    "factualScore": <1-100>,
    "emotionalVsRational": { "emotional": <0-100>, "rational": <0-100> },
    "strengths": ["<specific strength 1>", "<specific strength 2>", "<strength 3>"],
    "weaknesses": ["<specific weakness 1>", "<weakness 2>"],
    "fallacies": [{ "name": "<fallacy name>", "quote": "<the part that commits it>", "explanation": "<why it's a fallacy>" }],
    "evidenceQuality": "<anecdotal/statistical/expert/mixed - with explanation>",
    "devilsAdvocate": "<3 sentences arguing AGAINST this side>",
    "steelMan": "<The strongest possible version of this argument rewritten in 2-3 sentences>",
    "whatWouldChangeTheirMind": "<What evidence or argument would make this person reconsider?>"
  },
  "side2": {
    "name": "${side2Name}",
    "score": <1-100>,
    "persuasivenessScore": <1-100>,
    "factualScore": <1-100>,
    "emotionalVsRational": { "emotional": <0-100>, "rational": <0-100> },
    "strengths": ["<specific strength 1>", "<specific strength 2>", "<strength 3>"],
    "weaknesses": ["<specific weakness 1>", "<weakness 2>"],
    "fallacies": [{ "name": "<fallacy name>", "quote": "<the part that commits it>", "explanation": "<why it's a fallacy>" }],
    "evidenceQuality": "<anecdotal/statistical/expert/mixed - with explanation>",
    "devilsAdvocate": "<3 sentences arguing AGAINST this side>",
    "steelMan": "<The strongest possible version of this argument rewritten in 2-3 sentences>",
    "whatWouldChangeTheirMind": "<What evidence or argument would make this person reconsider?>"
  },
  "winner": "<name of winner or 'Draw'>",
  "verdict": "<4-5 sentence witty final verdict with specific reasoning>",
  "commonGround": "<2-3 sentences on where both sides actually agree>",
  "plotTwist": "<A surprising perspective neither side considered>",
  "biasCheck": "<Any shared biases or blind spots both arguers have>",
  "compromise": "<A detailed middle-ground solution that could satisfy both sides>",
  "debateTips": {
    "side1Tip": "<Specific advice for ${side1Name} on how to argue better>",
    "side2Tip": "<Specific advice for ${side2Name} on how to argue better>"
  }
}

Return ONLY JSON, no markdown.`);
  return parseJSON(text);
}

module.exports = { settleArgument };