from apiflask import APIBlueprint
from flask import abort

from ...base.mode import EnrollmentsMode
from ...base.schemas import MessageSchema
from ...dependencies import db
from ...examination_schedule.models import ExaminationSchedule
from ...project_supervisor.models import ProjectSupervisor
from ..models import Group, Student, TermOfDefence
from ..schemas import (
    ExaminationScheduleListSchema,
    TemporaryStudentSchema,
    TermOfDefenceStudentListSchema,
)

bp = APIBlueprint("enrollments", __name__, url_prefix="/")


@bp.post("/<int:examination_schedule_id>/enrollments/<int:term_of_defence_id>/")
@bp.input(TemporaryStudentSchema)
@bp.output(MessageSchema, status_code=201)
def assign_your_group_to_term_of_defence(
    examination_schedule_id: int, term_of_defence_id: int, data: dict
) -> dict:
    # this code will be removed
    student = Student.query.filter(Student.id == data.get("student_id")).first()
    if student is None:
        abort(404, "Not found student!")
    ################
    term_of_defence = (
        TermOfDefence.query.filter(
            TermOfDefence.id == term_of_defence_id,
            TermOfDefence.examination_schedule_id == examination_schedule_id,
        )
        .join(ExaminationSchedule)
        .first()
    )

    if term_of_defence is None or (ex := term_of_defence.examination_schedule) is None:
        abort(404, "Term of defence not found!")

    if ex.open_enrollments != EnrollmentsMode.OPEN.value:
        abort(400, "Enrollments is closed! You have been delayed!")

    group = (
        Group.query.join(ProjectSupervisor)
        .filter(Group.year_group_id == ex.year_group_id)
        .join(Group.students)
        .filter_by(index=student.index)
        .first()
    )
    if group is None or group.project_supervisor is None:
        abort(
            400,
            "You don't have a group or your group doesn't"
            " have an assigned project supervisor!",
        )

    defence = TermOfDefence.query.filter(
        TermOfDefence.group_id == group.id,
        TermOfDefence.examination_schedule_id == examination_schedule_id,
    ).first()
    if defence is not None:
        abort(400, "Your group has already assigned to any exam date!")

    td = (
        TermOfDefence.query.join(TermOfDefence.members_of_committee)
        .filter_by(id=group.project_supervisor_id)
        .first()
    )

    if td is None:
        abort(400, "Your project supervisor is not in committee!")

    term_of_defence.group_id = group.id
    db.session.add(term_of_defence)
    db.session.commit()
    return {"message": "You have just assigned the group for this exam date!"}


@bp.delete("/<int:examination_schedule_id>/enrollments/<int:term_of_defence_id>/")
@bp.input(TemporaryStudentSchema)
@bp.output(MessageSchema)
def delete_your_group_from_term_of_defence(
    examination_schedule_id: int, term_of_defence_id: int, data: dict
) -> dict:
    # this code will be removed
    student = Student.query.filter(Student.id == data.get("student_id")).first()
    if student is None:
        abort(404, "Not found student!")
    ################

    term_of_defence = (
        TermOfDefence.query.join(ExaminationSchedule)
        .filter(TermOfDefence.id == term_of_defence_id)
        .filter(TermOfDefence.examination_schedule_id == examination_schedule_id)
        .first()
    )

    if term_of_defence is None:
        abort(404, "Not found term of defence!")
    ex = term_of_defence.examination_schedule

    group = (
        Group.query.filter(Group.year_group_id == ex.year_group_id)
        .join(Group.students)
        .filter_by(index=student.index)
        .first()
    )
    if group is None or group.id != term_of_defence.group_id:
        abort(400, "You are not assigned to this group!")

    term_of_defence.group_id = None
    db.session.add(term_of_defence)
    db.session.commit()

    return {"message": "You have just removed the group for this exam date!"}


@bp.get("/examination-schedule/year-group/<int:year_group_id>/")
@bp.input(TemporaryStudentSchema, location="query")
@bp.output(ExaminationScheduleListSchema)
def list_examination_schedule(year_group_id: int, data: dict) -> dict:
    # this code will be removed
    student = Student.query.filter(Student.id == data.get("student_id")).first()
    if student is None:
        abort(404, "Not found student!")
    ################

    examination_schedules = ExaminationSchedule.query.filter(
        ExaminationSchedule.year_group_id == year_group_id
    ).all()
    return {"examination_schedules": examination_schedules}


@bp.get("/examination-schedule/<int:examination_schedule_id>/enrollments/")
@bp.input(TemporaryStudentSchema, location="query")
@bp.output(TermOfDefenceStudentListSchema)
def list_term_of_defences(examination_schedule_id: int, data: dict) -> dict:
    # this code will be removed
    student = Student.query.filter(Student.id == data.get("student_id")).first()
    if student is None:
        abort(404, "Not found student!")
    ################
    term_of_defences = (
        TermOfDefence.query.filter(
            TermOfDefence.examination_schedule_id == examination_schedule_id
        )
        .join(ExaminationSchedule, isouter=True)
        .all()
    )

    term_of_defences = list(
        filter(
            lambda n: len(
                [
                    d.id
                    for d in n.members_of_committee
                    if d.id == student.groups[0].project_supervisor.id
                ]
            )
            > 0,
            term_of_defences,
        )
    )

    return {"term_of_defences": term_of_defences}