"""
验证码仓储 SQLAlchemy 实现
"""

from __future__ import annotations

from datetime import datetime, timezone
from typing import Optional

from sqlalchemy.orm import Session

from packages.adapters.sqlalchemy_impl.models import VerificationCodeModel
from packages.domain.verification_code import VerificationCode
from packages.ports.verification_code_repository import VerificationCodeRepository


class SQLAlchemyVerificationCodeRepository(VerificationCodeRepository):
    def __init__(self, session: Session):
        self.session = session

    def save(self, code: VerificationCode) -> None:
        model = self.session.get(VerificationCodeModel, code.id)
        if model is None:
            model = VerificationCodeModel(id=code.id)
            self.session.add(model)

        model.recipient = code.recipient
        model.code = code.code
        model.code_type = code.code_type
        model.expires_at = code.expires_at
        model.used_at = code.used_at
        model.attempts = code.attempts
        model.created_at = code.created_at

        self.session.commit()
        self.session.refresh(model)

    def find_latest(self, recipient: str, code_type: str) -> Optional[VerificationCode]:
        model = (
            self.session.query(VerificationCodeModel)
            .filter(
                VerificationCodeModel.recipient == recipient.strip(),
                VerificationCodeModel.code_type == code_type,
            )
            .order_by(VerificationCodeModel.created_at.desc())
            .first()
        )
        return self._to_entity(model)

    def find_by_id(self, code_id: str) -> Optional[VerificationCode]:
        return self._to_entity(self.session.get(VerificationCodeModel, code_id))

    def count_today(self, recipient: str, code_type: str) -> int:
        now = datetime.now(timezone.utc)
        start_of_day = now.replace(hour=0, minute=0, second=0, microsecond=0)
        return (
            self.session.query(VerificationCodeModel)
            .filter(
                VerificationCodeModel.recipient == recipient.strip(),
                VerificationCodeModel.code_type == code_type,
                VerificationCodeModel.created_at >= start_of_day,
            )
            .count()
        )

    @staticmethod
    def _to_entity(model: VerificationCodeModel | None) -> VerificationCode | None:
        if model is None:
            return None

        # SQLAlchemy 从数据库读出的 DateTime 是 naive（不带时区），
        # 领域模型期望 aware datetime（带 timezone.utc），直接用会报
        # "can't compare offset-naive and offset-aware datetimes"
        def _ensure_aware(dt: datetime | None) -> datetime | None:
            if dt is None:
                return None
            if dt.tzinfo is None:
                return dt.replace(tzinfo=timezone.utc)
            return dt

        return VerificationCode(
            id=model.id,
            recipient=model.recipient,
            code=model.code,
            code_type=model.code_type,
            expires_at=_ensure_aware(model.expires_at),
            used_at=_ensure_aware(model.used_at),
            attempts=model.attempts,
            created_at=_ensure_aware(model.created_at),
        )