import logging
import re
import time
from dataclasses import dataclass, field
from typing import Any, Dict, List, Optional

from database.view_manager import IdentifierType

logger = logging.getLogger(__name__)

ENTITY_TYPE_MAP = {
    IdentifierType.CREDIT_FILE_ID: "credit_account",
    IdentifierType.LEAD_ID: "lead",
    IdentifierType.PLATE_NUMBER: "vehicle",
}

_FOLLOWUP_PRONOUNS_RE = re.compile(
    r"\b(bu|bunu|bunun|buna|bunlar|bunlarin|o|onu|onun|ona|onlar|"
    r"su|sunu|sunun|ayni|diger|bahsettigim|bahsettigin|onceki|yukardaki|"
    r"it|its|this|that|the\s+account|the\s+loan|the\s+record|"
    r"his|her|their|the\s+customer|the\s+client)\b",
    re.IGNORECASE,
)

_FOLLOWUP_PHRASES_RE = re.compile(
    r"(ne durumda|ne oldu|durumu ne|durumu nedir|sonucu ne|sonucu nedir|"
    r"onayi verildi mi|onaylandi mi|tamamlandi mi|"
    r"hala ayni mi|degisti mi|değişti mi|güncel durumu|guncel durumu|"
    r"son durum|mevcut durum|simdiki durum|şimdiki durum|"
    r"bilgisi ne|bilgisi nedir|bilgilerini goster|bilgilerini göster)",
    re.IGNORECASE,
)

_DOCUMENT_INDICATOR_RE = re.compile(
    r"(nasil yapilir|nasıl yapılır|nedir acikla|ne demek|"
    r"surec|süreç|süreçleri|prosedur|prosedür|"
    r"adimlari|adımları|adimlari neler|"
    r"nasil.*hesaplanir|nasıl.*hesaplanır|nasil.*calisir|nasıl.*çalışır|"
    r"dokuman|doküman|belgede|belgeler)",
    re.IGNORECASE,
)

_SHORT_QUERY_THRESHOLD = 60


@dataclass
class EntityContext:
    entity_type: str
    identifier_type: IdentifierType
    identifier_value: str
    data_payload: Optional[Any] = None
    response_text: Optional[str] = None
    query_type: str = "database"
    turn_index: int = 0
    timestamp: float = field(default_factory=time.time)
    view_name: Optional[str] = None
    sql_query: Optional[str] = None

    def to_dict(self) -> Dict[str, Any]:
        return {
            "entity_type": self.entity_type,
            "identifier_type": self.identifier_type.value,
            "identifier_value": self.identifier_value,
            "query_type": self.query_type,
            "turn_index": self.turn_index,
            "timestamp": self.timestamp,
            "view_name": self.view_name,
        }


@dataclass
class FollowUpDetection:
    is_followup: bool
    confidence: float = 0.0
    signals: List[str] = field(default_factory=list)
    resolved_identifier_type: Optional[IdentifierType] = None
    resolved_identifier_value: Optional[str] = None
    entity_context: Optional[EntityContext] = None
    needs_clarification: bool = False

    def to_dict(self) -> Dict[str, Any]:
        return {
            "is_followup": self.is_followup,
            "confidence": round(self.confidence, 3),
            "signals": self.signals,
            "resolved_identifier_type": self.resolved_identifier_type.value if self.resolved_identifier_type else None,
            "resolved_identifier_value": self.resolved_identifier_value,
            "needs_clarification": self.needs_clarification,
        }


class SessionEntityStore:

    def __init__(self, expiry_turns: int = 10, expiry_seconds: float = 600.0, secondary_retention_turns: int = 5):
        self._primary: Optional[EntityContext] = None
        self._secondary: Optional[EntityContext] = None
        self._turn_index: int = 0
        self._expiry_turns = expiry_turns
        self._expiry_seconds = expiry_seconds
        self._secondary_retention_turns = secondary_retention_turns
        self._has_had_context: bool = False
        self._last_aggregate: Optional[Dict[str, Any]] = None
        self._last_query_mode: Optional[str] = None

    @property
    def turn_index(self) -> int:
        return self._turn_index

    @property
    def primary(self) -> Optional[EntityContext]:
        if self._primary and self._is_expired(self._primary):
            logger.debug("primary entity context expired at turn %d", self._turn_index)
            self._primary = None
        return self._primary

    @property
    def secondary(self) -> Optional[EntityContext]:
        if self._secondary and self._is_expired(self._secondary, use_secondary=True):
            self._secondary = None
        return self._secondary

    def advance_turn(self) -> None:
        self._turn_index += 1

    @property
    def last_query_mode(self) -> Optional[str]:
        return self._last_query_mode

    @last_query_mode.setter
    def last_query_mode(self, mode: str) -> None:
        self._last_query_mode = mode

    def has_active_context(self) -> bool:
        return self.primary is not None

    def update_entity(
        self,
        identifier_type: IdentifierType,
        identifier_value: str,
        data_payload: Optional[Any] = None,
        response_text: Optional[str] = None,
        query_type: str = "database",
        view_name: Optional[str] = None,
        sql_query: Optional[str] = None,
    ) -> None:
        entity_type = ENTITY_TYPE_MAP.get(identifier_type, "unknown")
        now = time.time()

        if self._primary and self._primary.identifier_type == identifier_type and self._primary.identifier_value == identifier_value:
            self._primary.data_payload = data_payload if data_payload is not None else self._primary.data_payload
            self._primary.response_text = response_text or self._primary.response_text
            self._primary.turn_index = self._turn_index
            self._primary.timestamp = now
            self._primary.view_name = view_name or self._primary.view_name
            self._primary.sql_query = sql_query or self._primary.sql_query
            logger.info("updated existing entity context %s=%s at turn %d", identifier_type.value, identifier_value, self._turn_index)
            return

        if self._primary and self._primary.identifier_type != identifier_type:
            self._secondary = self._primary
            logger.debug("moved primary to secondary: %s=%s", self._primary.identifier_type.value, self._primary.identifier_value)

        self._primary = EntityContext(
            entity_type=entity_type,
            identifier_type=identifier_type,
            identifier_value=identifier_value,
            data_payload=data_payload,
            response_text=response_text,
            query_type=query_type,
            turn_index=self._turn_index,
            timestamp=now,
            view_name=view_name,
            sql_query=sql_query,
        )
        self._has_had_context = True
        logger.info("set primary entity context %s=%s at turn %d", identifier_type.value, identifier_value, self._turn_index)

    def update_turn_only(self) -> None:
        if self._primary:
            self._primary.turn_index = self._turn_index
            self._primary.timestamp = time.time()

    def update_aggregate(self, view_name: str, response_text: str, sql_query: Optional[str] = None) -> None:
        self._last_aggregate = {
            "view_name": view_name,
            "response_text": response_text,
            "sql_query": sql_query,
            "turn_index": self._turn_index,
            "timestamp": time.time(),
        }

    @property
    def last_aggregate(self) -> Optional[Dict[str, Any]]:
        if self._last_aggregate is None:
            return None
        turns_since = self._turn_index - self._last_aggregate["turn_index"]
        if turns_since > self._expiry_turns:
            self._last_aggregate = None
            return None
        return self._last_aggregate

    def detect_followup(self, query: str) -> FollowUpDetection:
        from database.view_manager import extract_identifier, has_view_specific_keywords

        _, id_val = extract_identifier(query)
        if id_val:
            return FollowUpDetection(is_followup=False, confidence=0.0, signals=["explicit_id_present"])

        signals: List[str] = []
        confidence = 0.0

        has_pronouns = bool(_FOLLOWUP_PRONOUNS_RE.search(query))
        if has_pronouns:
            signals.append("pronoun_reference")
            confidence += 0.35

        has_view_kw = has_view_specific_keywords(query)
        if has_view_kw:
            signals.append("view_attribute_keywords")
            confidence += 0.40

        has_phrases = bool(_FOLLOWUP_PHRASES_RE.search(query))
        if has_phrases:
            signals.append("followup_phrase")
            confidence += 0.45

        is_short = len(query.strip()) < _SHORT_QUERY_THRESHOLD
        if is_short:
            signals.append("short_query")
            confidence += 0.10

        has_doc_signal = bool(_DOCUMENT_INDICATOR_RE.search(query))
        if has_doc_signal:
            signals.append("document_indicator")
            confidence -= 0.30

        signals.append("no_explicit_id")
        confidence += 0.05

        has_strong_signal = has_pronouns or has_view_kw or has_phrases
        looks_like_followup = confidence >= 0.5 and has_strong_signal

        if not looks_like_followup:
            return FollowUpDetection(is_followup=False, confidence=max(confidence, 0.0), signals=signals)

        if not self.has_active_context():
            if not self._has_had_context:
                return FollowUpDetection(is_followup=False, confidence=max(confidence, 0.0), signals=signals + ["no_prior_context"])
            logger.info("followup detected but active context expired, requesting clarification")
            return FollowUpDetection(
                is_followup=True,
                confidence=min(confidence, 1.0),
                signals=signals + ["no_active_context"],
                needs_clarification=True,
            )

        ctx = self._resolve_best_entity(query)
        logger.info(
            "followup resolved: %s=%s confidence=%.2f signals=%s",
            ctx.identifier_type.value, ctx.identifier_value, confidence, signals,
        )
        return FollowUpDetection(
            is_followup=True,
            confidence=min(confidence, 1.0),
            signals=signals,
            resolved_identifier_type=ctx.identifier_type,
            resolved_identifier_value=ctx.identifier_value,
            entity_context=ctx,
        )

    def _resolve_best_entity(self, query: str) -> EntityContext:
        if not self.secondary:
            return self._primary
        q_lower = query.lower()
        _VEHICLE_HINTS = {"plaka", "arac", "araç", "rehin", "lien", "marka", "model"}
        _LEAD_HINTS = {"lead", "basvuru", "başvuru", "musteri", "müşteri"}
        _CREDIT_HINTS = {"teklif", "dosya", "kredi", "statu", "statü", "odeme", "ödeme", "pesinat", "peşinat", "karar"}
        secondary = self._secondary
        TYPE_KEYWORDS = {
            IdentifierType.PLATE_NUMBER: _VEHICLE_HINTS,
            IdentifierType.LEAD_ID: _LEAD_HINTS,
            IdentifierType.CREDIT_FILE_ID: _CREDIT_HINTS,
        }
        secondary_hints = TYPE_KEYWORDS.get(secondary.identifier_type, set())
        if any(h in q_lower for h in secondary_hints):
            primary_hints = TYPE_KEYWORDS.get(self._primary.identifier_type, set())
            if not any(h in q_lower for h in primary_hints):
                logger.debug("followup resolved to secondary entity %s=%s", secondary.identifier_type.value, secondary.identifier_value)
                return secondary
        return self._primary

    def build_context_preamble(self) -> str:
        parts = []
        if self.has_active_context():
            ctx = self._primary
            parts.append(f"AKTIF VARLIK: {ctx.entity_type} (Tip: {ctx.identifier_type.value}, ID: {ctx.identifier_value})")
            if ctx.response_text:
                trimmed = ctx.response_text[:500]
                parts.append(f"ONCEKI YANIT: {trimmed}")
        agg = self.last_aggregate
        if agg:
            parts.append(f"SON TOPLU SORGU: {agg['view_name']}")
            if agg.get("response_text"):
                trimmed = agg["response_text"][:500]
                parts.append(f"TOPLU SORGU YANITI: {trimmed}")
        return "\n".join(parts)

    def clear(self) -> None:
        self._primary = None
        self._secondary = None
        self._turn_index = 0
        self._has_had_context = False
        self._last_aggregate = None
        self._last_query_mode = None

    def _is_expired(self, ctx: EntityContext, use_secondary: bool = False) -> bool:
        turns_since = self._turn_index - ctx.turn_index
        max_turns = self._secondary_retention_turns if use_secondary else self._expiry_turns
        if turns_since > max_turns:
            return True
        if time.time() - ctx.timestamp > self._expiry_seconds:
            return True
        return False

    def to_dict(self) -> Dict[str, Any]:
        return {
            "turn_index": self._turn_index,
            "primary": self._primary.to_dict() if self._primary else None,
            "secondary": self._secondary.to_dict() if self._secondary else None,
            "expiry_turns": self._expiry_turns,
            "expiry_seconds": self._expiry_seconds,
            "last_aggregate": self._last_aggregate,
        }


_store_instance: Optional[SessionEntityStore] = None


def get_entity_store() -> SessionEntityStore:
    global _store_instance
    if _store_instance is None:
        from config import ENTITY_CONTEXT_EXPIRY_TURNS, ENTITY_CONTEXT_EXPIRY_SECONDS, ENTITY_CONTEXT_SECONDARY_RETENTION_TURNS
        _store_instance = SessionEntityStore(
            expiry_turns=ENTITY_CONTEXT_EXPIRY_TURNS,
            expiry_seconds=ENTITY_CONTEXT_EXPIRY_SECONDS,
            secondary_retention_turns=ENTITY_CONTEXT_SECONDARY_RETENTION_TURNS,
        )
    return _store_instance


def reset_entity_store() -> None:
    global _store_instance
    if _store_instance is not None:
        _store_instance.clear()
    _store_instance = None