from ..dependencies import db
from ..base.models import Base


class ExaminationSchedule(Base):
    __tablename__ = 'examination_schedules'

    title = db.Column(db.String(100), unique=True, nullable=False)
    mode = db.Column(db.Boolean, default=True, nullable=False)  # True - stationary, False - non-stationary
    start_date = db.Column(db.DateTime)
    end_date = db.Column(db.DateTime)


class Enrollment(Base):
    __tablename__ = 'enrollments'

    start_date = db.Column(db.DateTime, nullable=False)
    end_date = db.Column(db.DateTime, nullable=False)
    examination_schedule_id = db.Column(db.Integer, db.ForeignKey('examination_schedules.id'))
    examination_schedule = db.relationship('ExaminationSchedule', backref='enrollments')
    committee = db.relationship("Committee", uselist=False, backref=db.backref('enrollment', passive_deletes=True))
    group_id = db.Column(db.Integer, db.ForeignKey('groups.id'))


class Committee(Base):
    __tablename__ = 'committees'

    enrollment_id = db.Column(db.Integer, db.ForeignKey('enrollments.id', ondelete='CASCADE'))
    members = db.relationship('ProjectSupervisor', secondary='committees_projects_supervisors', backref='committees')


class CommitteeProjectSupervisor(Base):
    __tablename__ = 'committees_projects_supervisors'

    chairman = db.Column(db.Boolean, default=False, nullable=False)
    committee_id = db.Column(db.Integer, db.ForeignKey('committees.id'))
    member_id = db.Column(db.Integer, db.ForeignKey('project_supervisors.id'))