breakpilot-lehrer/backend-lehrer/game/quiz_generator.py

# ==============================================
# Breakpilot Drive - Quiz Generator Service
# ==============================================
# Generiert Quiz-Fragen dynamisch via LLM Gateway.
# Unterstuetzt Caching via Valkey fuer Performance.

import os
import json
import logging
from typing import Optional, List, Dict, Any
from dataclasses import dataclass
from enum import Enum

logger = logging.getLogger(__name__)

# Configuration
LLM_MODEL = os.getenv("GAME_LLM_MODEL", "llama-3.1-8b")
LLM_FALLBACK_MODEL = os.getenv("GAME_LLM_FALLBACK_MODEL", "claude-3-haiku")
CACHE_TTL = int(os.getenv("GAME_QUESTION_CACHE_TTL", "3600"))  # 1 hour


class Subject(str, Enum):
    """Available subjects for quiz questions."""
    MATH = "math"
    GERMAN = "german"
    ENGLISH = "english"
    GENERAL = "general"


class QuizMode(str, Enum):
    """Quiz modes with different time constraints."""
    QUICK = "quick"    # 2-3 options, 3-5 seconds
    PAUSE = "pause"    # 4 options, unlimited time


@dataclass
class GeneratedQuestion:
    """Generated question from LLM."""
    question_text: str
    options: List[str]
    correct_index: int
    explanation: Optional[str] = None
    difficulty: int = 3
    subject: str = "general"
    grade_level: int = 4
    quiz_mode: str = "quick"
    visual_trigger: Optional[str] = None
    time_limit_seconds: Optional[float] = None


# ==============================================
# Prompt Templates
# ==============================================

QUICK_QUESTION_PROMPT = """Du bist ein Lehrer fuer Grundschulkinder (Klasse {grade}).
Erstelle eine SCHNELLE Quiz-Frage zum Thema "{subject}" mit Schwierigkeit {difficulty}/5.

Kontext: Das Kind faehrt in einem Autorennen-Spiel und sieht gerade ein(e) {visual_trigger}.
Die Frage soll zum visuellen Element passen und in 3-5 Sekunden beantwortbar sein.

Regeln:
- NUR 2-3 kurze Antwortoptionen
- Frage muss sehr kurz sein (max 10 Woerter)
- Antworten muessen eindeutig richtig/falsch sein
- Kindgerecht und motivierend

Antworte NUR im JSON-Format:
{{
  "question_text": "Kurze Frage?",
  "options": ["Antwort1", "Antwort2"],
  "correct_index": 0,
  "explanation": "Kurze Erklaerung"
}}"""

PAUSE_QUESTION_PROMPT = """Du bist ein Lehrer fuer Grundschulkinder (Klasse {grade}).
Erstelle eine DENKAUFGABE zum Thema "{subject}" mit Schwierigkeit {difficulty}/5.

Das Kind hat Zeit zum Nachdenken (Spiel ist pausiert).
Die Frage darf komplexer sein und Textverstaendnis erfordern.

Regeln:
- 4 Antwortoptionen
- Frage kann laenger sein (Textaufgabe erlaubt)
- Eine Option ist eindeutig richtig
- Kindgerecht formulieren

Antworte NUR im JSON-Format:
{{
  "question_text": "Die vollstaendige Frage oder Aufgabe?",
  "options": ["Option A", "Option B", "Option C", "Option D"],
  "correct_index": 0,
  "explanation": "Erklaerung warum diese Antwort richtig ist"
}}"""

SUBJECT_CONTEXTS = {
    "math": {
        "quick": ["Kopfrechnen", "Einmaleins", "Plus/Minus"],
        "pause": ["Textaufgaben", "Geometrie", "Brueche", "Prozent"]
    },
    "german": {
        "quick": ["Rechtschreibung", "Artikel"],
        "pause": ["Grammatik", "Wortarten", "Satzglieder", "Zeitformen"]
    },
    "english": {
        "quick": ["Vokabeln", "Farben", "Zahlen", "Tiere"],
        "pause": ["Grammatik", "Saetze bilden", "Uebersetzung"]
    },
    "general": {
        "quick": ["Allgemeinwissen"],
        "pause": ["Sachkunde", "Natur", "Geographie"]
    }
}

VISUAL_TRIGGER_THEMES = {
    "bridge": {
        "math": "Wie lang ist die Bruecke? Wie viele Autos passen drauf?",
        "german": "Wie schreibt man Bruecke? Was reimt sich?",
        "english": "What is this? Bridge vocabulary"
    },
    "tree": {
        "math": "Wie viele Blaetter? Wie hoch ist der Baum?",
        "german": "Nomen oder Verb? Einzahl/Mehrzahl",
        "english": "Tree, leaf, branch vocabulary"
    },
    "house": {
        "math": "Fenster zaehlen, Stockwerke",
        "german": "Wortfamilie Haus",
        "english": "House, room vocabulary"
    },
    "car": {
        "math": "Raeder zaehlen, Geschwindigkeit",
        "german": "Fahrzeug-Woerter",
        "english": "Car, vehicle vocabulary"
    },
    "mountain": {
        "math": "Hoehe, Entfernung",
        "german": "Landschafts-Begriffe",
        "english": "Mountain, hill vocabulary"
    },
    "river": {
        "math": "Laenge, Breite",
        "german": "Wasser-Woerter",
        "english": "River, water vocabulary"
    }
}


class QuizGenerator:
    """
    Generates quiz questions using LLM Gateway.

    Supports caching via Valkey for performance.
    Falls back to static questions if LLM unavailable.
    """

    def __init__(self):
        self._llm_client = None
        self._valkey_client = None
        self._llm_available = False
        self._cache_available = False

    async def connect(self):
        """Initialize LLM and cache connections."""
        await self._connect_llm()
        await self._connect_cache()

    async def _connect_llm(self):
        """Connect to LLM Gateway."""
        try:
            # Try to import LLM client from existing gateway
            from llm_gateway.services.inference import InferenceService
            self._llm_client = InferenceService()
            self._llm_available = True
            logger.info("Quiz Generator connected to LLM Gateway")
        except ImportError:
            logger.warning("LLM Gateway not available, using static questions")
            self._llm_available = False
        except Exception as e:
            logger.warning(f"LLM connection failed: {e}")
            self._llm_available = False

    async def _connect_cache(self):
        """Connect to Valkey cache."""
        try:
            import redis.asyncio as redis
            valkey_url = os.getenv("VALKEY_URL", "redis://localhost:6379")
            self._valkey_client = redis.from_url(
                valkey_url,
                encoding="utf-8",
                decode_responses=True,
            )
            await self._valkey_client.ping()
            self._cache_available = True
            logger.info("Quiz Generator connected to Valkey cache")
        except Exception as e:
            logger.warning(f"Valkey cache not available: {e}")
            self._cache_available = False

    def _get_cache_key(
        self,
        difficulty: int,
        subject: str,
        mode: str,
        visual_trigger: Optional[str] = None
    ) -> str:
        """Generate cache key for questions."""
        if visual_trigger:
            return f"quiz:d{difficulty}:s{subject}:m{mode}:v{visual_trigger}"
        return f"quiz:d{difficulty}:s{subject}:m{mode}"

    async def get_cached_questions(
        self,
        difficulty: int,
        subject: str,
        mode: str,
        count: int,
        visual_trigger: Optional[str] = None
    ) -> List[GeneratedQuestion]:
        """Get questions from cache."""
        if not self._cache_available:
            return []

        try:
            cache_key = self._get_cache_key(difficulty, subject, mode, visual_trigger)
            cached = await self._valkey_client.lrange(cache_key, 0, count - 1)

            questions = []
            for item in cached:
                data = json.loads(item)
                questions.append(GeneratedQuestion(**data))

            return questions
        except Exception as e:
            logger.warning(f"Cache read failed: {e}")
            return []

    async def cache_questions(
        self,
        questions: List[GeneratedQuestion],
        difficulty: int,
        subject: str,
        mode: str,
        visual_trigger: Optional[str] = None
    ):
        """Store questions in cache."""
        if not self._cache_available:
            return

        try:
            cache_key = self._get_cache_key(difficulty, subject, mode, visual_trigger)

            for q in questions:
                data = {
                    "question_text": q.question_text,
                    "options": q.options,
                    "correct_index": q.correct_index,
                    "explanation": q.explanation,
                    "difficulty": q.difficulty,
                    "subject": q.subject,
                    "grade_level": q.grade_level,
                    "quiz_mode": q.quiz_mode,
                    "visual_trigger": q.visual_trigger,
                    "time_limit_seconds": q.time_limit_seconds,
                }
                await self._valkey_client.rpush(cache_key, json.dumps(data))

            await self._valkey_client.expire(cache_key, CACHE_TTL)
        except Exception as e:
            logger.warning(f"Cache write failed: {e}")

    async def generate_question(
        self,
        difficulty: int = 3,
        subject: str = "general",
        mode: str = "quick",
        grade: int = 4,
        visual_trigger: Optional[str] = None
    ) -> Optional[GeneratedQuestion]:
        """
        Generate a single question using LLM.

        Falls back to None if LLM unavailable (caller should use static questions).
        """
        if not self._llm_available or not self._llm_client:
            return None

        # Select prompt template
        if mode == "quick":
            prompt = QUICK_QUESTION_PROMPT.format(
                grade=grade,
                subject=subject,
                difficulty=difficulty,
                visual_trigger=visual_trigger or "Strasse"
            )
            time_limit = 3.0 + (difficulty * 0.5)  # 3.5 - 5.5 seconds
        else:
            prompt = PAUSE_QUESTION_PROMPT.format(
                grade=grade,
                subject=subject,
                difficulty=difficulty
            )
            time_limit = None

        try:
            # Call LLM Gateway
            response = await self._llm_client.chat_completion(
                messages=[{"role": "user", "content": prompt}],
                model=LLM_MODEL,
                temperature=0.7,
                max_tokens=500
            )

            # Parse JSON response
            content = response.get("content", "")

            # Extract JSON from response (handle markdown code blocks)
            if "```json" in content:
                content = content.split("```json")[1].split("```")[0]
            elif "```" in content:
                content = content.split("```")[1].split("```")[0]

            data = json.loads(content.strip())

            return GeneratedQuestion(
                question_text=data["question_text"],
                options=data["options"],
                correct_index=data["correct_index"],
                explanation=data.get("explanation"),
                difficulty=difficulty,
                subject=subject,
                grade_level=grade,
                quiz_mode=mode,
                visual_trigger=visual_trigger,
                time_limit_seconds=time_limit
            )

        except json.JSONDecodeError as e:
            logger.warning(f"Failed to parse LLM response: {e}")
            return None
        except Exception as e:
            logger.error(f"LLM question generation failed: {e}")
            return None

    async def generate_questions_batch(
        self,
        difficulty: int,
        subject: str,
        mode: str,
        count: int,
        grade: int = 4,
        visual_trigger: Optional[str] = None
    ) -> List[GeneratedQuestion]:
        """Generate multiple questions."""
        questions = []

        for _ in range(count):
            q = await self.generate_question(
                difficulty=difficulty,
                subject=subject,
                mode=mode,
                grade=grade,
                visual_trigger=visual_trigger
            )
            if q:
                questions.append(q)

        return questions

    async def get_questions(
        self,
        difficulty: int = 3,
        subject: str = "general",
        mode: str = "quick",
        count: int = 5,
        grade: int = 4,
        visual_trigger: Optional[str] = None
    ) -> List[GeneratedQuestion]:
        """
        Get questions with caching.

        1. Check cache first
        2. Generate new if not enough cached
        3. Cache new questions
        4. Return combined result
        """
        # Try cache first
        cached = await self.get_cached_questions(
            difficulty, subject, mode, count, visual_trigger
        )

        if len(cached) >= count:
            return cached[:count]

        # Generate more questions
        needed = count - len(cached)
        new_questions = await self.generate_questions_batch(
            difficulty=difficulty,
            subject=subject,
            mode=mode,
            count=needed * 2,  # Generate extra for cache
            grade=grade,
            visual_trigger=visual_trigger
        )

        # Cache new questions
        if new_questions:
            await self.cache_questions(
                new_questions, difficulty, subject, mode, visual_trigger
            )

        # Combine and return
        all_questions = cached + new_questions
        return all_questions[:count]

    def get_grade_for_difficulty(self, difficulty: int) -> int:
        """Map difficulty level to grade level."""
        mapping = {
            1: 2,  # Klasse 2
            2: 3,  # Klasse 3
            3: 4,  # Klasse 4
            4: 5,  # Klasse 5
            5: 6,  # Klasse 6
        }
        return mapping.get(difficulty, 4)


# Global instance
_quiz_generator: Optional[QuizGenerator] = None


async def get_quiz_generator() -> QuizGenerator:
    """Get or create the global quiz generator instance."""
    global _quiz_generator

    if _quiz_generator is None:
        _quiz_generator = QuizGenerator()
        await _quiz_generator.connect()

    return _quiz_generator