import datetime
from sqlalchemy import create_engine, Column, Integer, String, Float, DateTime, Text
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

DATABASE_URL = "sqlite:///./diagnostic_history.db"

engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

class PredictionRecord(Base):
    __tablename__ = "prediction_history"

    id = Column(Integer, primary_key=True, index=True)
    timestamp = Column(DateTime, default=datetime.datetime.utcnow)
    module = Column(String, index=True)  # 'blood_cell' or 'skin_lesion'
    filename = Column(String)
    predicted_class = Column(String)
    confidence = Column(Float)
    notes = Column(Text, nullable=True)

def init_db():
    Base.metadata.create_all(bind=engine)

def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()