from datetime import datetime

from flask_sqlalchemy import BaseQuery

from ..dependencies import db
from ..base.models import Person, Base
from ..base.utils import order_by_column_name
from ..examination_schedule.models import TermOfDefence


class YearGroupStudents(Base):
    __tablename__ = 'year_group_students'

    year_group_id = db.Column(db.Integer, db.ForeignKey('year_groups.id', ondelete='CASCADE'))
    student_index = db.Column(db.Integer, db.ForeignKey('students.index', ondelete='CASCADE'))


class YearGroup(Base):
    __tablename__ = 'year_groups'

    name = db.Column(db.String(50), nullable=False)
    mode = db.Column(db.String(1), nullable=False)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
    students = db.relationship("YearGroupStudents")

    __table__args = (
        db.UniqueConstraint('name', 'mode', name='uc_name_mode_year_group')
    )


students_groups = db.Table('students_groups',
                           db.Column('group_id', db.ForeignKey('groups.id'), nullable=False),
                           db.Column('student_index', db.ForeignKey('students.index'), nullable=False))


class Group(Base):
    __tablename__ = "groups"

    name = db.Column(db.String(60), nullable=False)
    cdyd_kod = db.Column(db.String(60), default='2022/SZ')
    prz_kod = db.Column(db.String(60), default='06-DPRILI0')
    tzaj_kod = db.Column(db.String(60), default='LAB')
    project_supervisor_id = db.Column(db.Integer, db.ForeignKey('project_supervisors.id'))
    project_supervisor = db.relationship('ProjectSupervisor', backref='groups', lazy=True)
    year_group_id = db.Column(db.Integer, db.ForeignKey('year_groups.id'))
    year_group = db.relationship('YearGroup', backref='groups', lazy=True)
    points_for_first_term = db.Column(db.Integer, default=0, nullable=False)
    points_for_second_term = db.Column(db.Integer, default=0, nullable=False)
    students = db.relationship('Student', secondary=students_groups, back_populates='groups')

    @classmethod
    def search_by_name(cls, year_group_id: int, search_name: str = None) -> BaseQuery:
        group_query = cls.query.filter(Group.year_group_id == year_group_id)

        if search_name is not None:
            group_query = group_query.filter(Group.name.like(f'{search_name}%'))

        return group_query


class Student(Person):
    __tablename__ = "students"

    pesel = db.Column(db.String(11), default='')
    index = db.Column(db.Integer, primary_key=True)
    groups = db.relationship('Group', secondary=students_groups, back_populates='students')
    year_groups = db.relationship("YearGroupStudents")

    @classmethod
    def search_by_fullname_and_mode_and_order_by_first_name_or_last_name(cls, year_group_id: int, fullname: str = None,
                                                                         order_by_first_name: str = None,
                                                                         order_by_last_name: str = None) -> BaseQuery:
        student_query = cls.query.filter(YearGroup.id == year_group_id)

        if fullname is not None:
            student_query = student_query.filter((Student.first_name + ' ' + Student.last_name).like(f'{fullname}%'))

        student_query = order_by_column_name(student_query, Student.first_name, order_by_first_name)
        student_query = order_by_column_name(student_query, Student.last_name, order_by_last_name)

        return student_query