from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, LargeBinary, UniqueConstraint
from sqlalchemy.orm import relationship
from database import Base
import datetime

class Student(Base):
    __tablename__ = "students"

    id = Column(Integer, primary_key=True, index=True)
    name = Column(String(100), nullable=False)
    email = Column(String(100), nullable=False, unique=True, index=True)

    __table_args__ = (UniqueConstraint('email', name='uq_student_email'),)

    checkins = relationship("CheckInLog", back_populates="student")
    encodings = relationship("StudentEncoding", back_populates="student")

class StudentEncoding(Base):
    __tablename__ = "student_encodings"

    id = Column(Integer, primary_key=True, index=True)
    student_id = Column(Integer, ForeignKey("students.id"))
    encoding = Column(LargeBinary, nullable=False)
    created_at = Column(DateTime, default=datetime.datetime.utcnow)

    student = relationship("Student", back_populates="encodings")

class CheckInLog(Base):
    __tablename__ = "checkin_logs"

    id = Column(Integer, primary_key=True, index=True)
    student_id = Column(Integer, ForeignKey("students.id"))
    time = Column(DateTime, default=datetime.datetime.utcnow)
    camera_id = Column(String(100))

    student = relationship("Student", back_populates="checkins")