"""
Moteur de décision IA principal - Architecture hybride.
Flux: StateAnalyzer → HeuristicEngine + LLMAdvisor → Fusion → FullAdvice
"""
import time
from dataclasses import dataclass, field
import structlog

log = structlog.get_logger()


@dataclass
class GameState:
    """État complet d'un tour HSBG."""
    turn: int = 0
    tavern_tier: int = 1
    gold: int = 3
    hero_id: str = ""
    hero_hp: int = 40
    tavern_minions: list = field(default_factory=list)
    board_minions: list = field(default_factory=list)
    hand_minions: list = field(default_factory=list)
    freeze: bool = False
    can_upgrade: bool = True
    upgrade_cost: int = 5
    available_spells: list = field(default_factory=list)
    opponent_boards: list = field(default_factory=list)
    current_placement: int = 5
    player_count: int = 8
    phase: str = "recruit"


@dataclass
class Decision:
    """Une décision IA avec justification."""
    action: str                           # buy|sell|freeze|upgrade|reposition|hero_power|wait
    target: dict = None                   # Carte ou minion ciblé
    priority: int = 5                     # 1-10
    confidence: float = 0.5              # 0.0-1.0
    reasoning: str = ""                   # Explication textuelle
    alternatives: list = field(default_factory=list)
    synergies_highlighted: list = field(default_factory=list)
    warnings: list = field(default_factory=list)


@dataclass
class FullAdvice:
    """Conseil complet pour un tour entier."""
    main_decision: Decision
    secondary_decisions: list = field(default_factory=list)
    board_analysis: str = ""
    strategy_long_term: str = ""
    threat_assessment: str = ""
    processing_ms: int = 0
    model_used: str = "heuristic"
    confidence_overall: float = 0.5


class DecisionEngine:
    """
    Moteur de décision hybride HSBG.
    
    Architecture:
    1. StateAnalyzer  → Parse l'état brut en GameState typé
    2. HeuristicEngine → Règles métier rapides et déterministes  
    3. LLMAdvisor     → Raisonnement LLM pour enrichir (si disponible)
    4. Fusion         → Combine les deux avec pondération par confiance
    """

    def __init__(self, settings):
        self.settings = settings
        self._initialized = False
        # Import lazy pour éviter les imports circulaires
        from backend.ai.engine.heuristics import HeuristicEngine
        from backend.ai.engine.llm_advisor import LLMAdvisor
        from backend.ai.engine.state_analyzer import StateAnalyzer
        self.heuristic = HeuristicEngine()
        self.llm = LLMAdvisor(settings)
        self.analyzer = StateAnalyzer()

    async def initialize(self):
        """Initialise les composants asynchrones (LLM)."""
        await self.llm.initialize()
        self._initialized = True
        log.info("decision_engine.ready", model=self.settings.llm_model)

    async def get_advice(self, raw_state: dict) -> FullAdvice:
        """
        Point d'entrée principal.
        
        Args:
            raw_state: Dict brut (depuis API ou OCR)
        Returns:
            FullAdvice avec conseil principal + alternatives
        """
        start = time.perf_counter()

        # 1. Parser l'état brut
        state = await self.analyzer.parse(raw_state)

        # 2. Heuristiques (toujours disponibles, < 5ms)
        heuristic_decisions = self.heuristic.evaluate(state)

        # 3. LLM (si disponible, ~500-2000ms)
        llm_advice = None
        if self._initialized:
            try:
                llm_advice = await self.llm.advise(state, heuristic_decisions)
            except Exception as e:
                log.warning("llm.failed_gracefully", error=str(e))

        # 4. Fusion avec pondération
        final = self._fuse(state, heuristic_decisions, llm_advice)
        final.processing_ms = int((time.perf_counter() - start) * 1000)

        log.info(
            "advice.generated",
            action=final.main_decision.action,
            confidence=round(final.main_decision.confidence, 2),
            ms=final.processing_ms,
            model=final.model_used,
        )
        return final

    def _fuse(self, state: GameState, heuristics: list, llm: "FullAdvice | None") -> FullAdvice:
        """
        Fusionne heuristiques + LLM.
        Règle: LLM prioritaire si confiance > 0.7, sinon heuristiques.
        """
        if not heuristics:
            return FullAdvice(
                main_decision=Decision(action="wait", reasoning="Aucune action identifiée"),
                model_used="fallback",
            )

        # LLM haute confiance → priorité totale
        if llm and llm.confidence_overall > 0.7:
            llm.model_used = f"{self.settings.llm_model}+heuristic"
            return llm

        # Heuristiques comme base
        main = max(heuristics, key=lambda d: d.priority * d.confidence)
        secondary = sorted(
            [d for d in heuristics if d != main],
            key=lambda d: d.priority,
            reverse=True,
        )[:3]

        result = FullAdvice(
            main_decision=main,
            secondary_decisions=secondary,
            board_analysis=self._analyze_board(state),
            model_used="heuristic",
            confidence_overall=main.confidence,
        )

        # Enrichissement LLM partiel (stratégie + menaces même si confiance faible)
        if llm:
            result.strategy_long_term = llm.strategy_long_term
            result.threat_assessment = llm.threat_assessment
            result.model_used = f"heuristic+{self.settings.llm_model}"

        return result

    def _analyze_board(self, state: GameState) -> str:
        """Génère une analyse textuelle rapide du board."""
        parts = []

        if len(state.board_minions) == 7:
            parts.append("⚠️ Board plein — vendre avant d'acheter")

        if state.gold >= 10 and state.tavern_tier < 6:
            parts.append(f"💰 Or abondant — envisager tier {state.tavern_tier + 1}")

        if state.current_placement > 5 and state.turn > 8:
            parts.append("🚨 Position critique — trouver synergie forte rapidement")

        # Détecter synergie dominante
        from collections import Counter
        races = []
        for m in state.board_minions:
            r = m.get("race", [])
            races.extend(r if isinstance(r, list) else [r])
        if races:
            top_race, top_count = Counter(races).most_common(1)[0]
            if top_count >= 3:
                parts.append(f"✨ Synergie {top_race} détectée ({top_count}/7)")

        if state.freeze:
            parts.append("❄️ Taverne gelée — les cartes sont réservées")

        return " | ".join(parts) if parts else "Board standard — continuer normalement"

    async def shutdown(self):
        """Arrête proprement les composants."""
        await self.llm.shutdown()