from sqlalchemy.sql import text
from flask_sqlalchemy import BaseQuery

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


class ProjectSupervisor(Base, Person):
    __tablename__ = "project_supervisors"

    limit_group = db.Column(db.Integer, default=1, nullable=False)
    mode = db.Column(db.Boolean, default=True, nullable=False)  # True - stationary, False - non-stationary


class Group(Base):
    __tablename__ = "groups"

    name = db.Column(db.String(60), nullable=False)
    project_supervisor_id = db.Column(db.Integer, db.ForeignKey('project_supervisors.id'))
    project_supervisor = db.relationship('ProjectSupervisor', backref='groups', lazy=True)


class Student(Person):
    __tablename__ = "students"

    index = db.Column(db.Integer, primary_key=True)
    first_term = db.Column(db.Integer, default=0, nullable=False)
    second_term = db.Column(db.Integer, default=0, nullable=False)
    group_id = db.Column(db.Integer, db.ForeignKey('groups.id'))
    group = db.relationship('Group', backref='students', lazy=True)
    mode = db.Column(db.Boolean, default=True, nullable=False)  # True - stationary, False - non-stationary

    @classmethod
    def search_by_fullname_and_order_by_first_name_or_last_name(cls, fullname: str = None,
                                                                order_by_first_name: str = None,
                                                                order_by_last_name: str = None) -> BaseQuery:
        student_query = cls.query

        if fullname is not None:
            """This works only for sqlite3 database - concat function  doesn't exist so i used builtin concat 
            operator specific only for sqlite db - || """
            student_query = student_query.filter(
                text("students_first_name || ' ' || students_last_name LIKE :fullname ")
            ).params(fullname=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