import datetime

from apiflask import APIBlueprint
from flask import abort, current_app

from ..schemas import MessageSchema, CommitteeCreateSchema, TemporaryProjectSupervisorSchema
from ...examination_schedule.models import Enrollment, Committee, ExaminationSchedule
from ...dependencies import db
from ..models import ProjectSupervisor
from ..query import get_enrollment_by_enrollment_and_examination_schedule_ids, \
    check_the_project_supervisor_is_in_committee, check_the_enrollments_has_just_started

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


@bp.post('/<int:examination_schedule_id>/enrollments/<int:enrollment_id>/')
@bp.input(CommitteeCreateSchema)
@bp.output(MessageSchema)
def assign_yourself_to_committee(examination_schedule_id: int, enrollment_id: int, data: dict) -> dict:
    # this code will be removed
    project_supervisor = db.session.query(ProjectSupervisor).filter(
        ProjectSupervisor.id == data['project_supervisor_id']).first()
    if project_supervisor is None:
        abort(404, "ProjectSupervisor doesn't exist!")
    ################

    limit_of_committtee = current_app.config['LIMIT_PERSONS_PER_COMMITTEE']

    enrollment = get_enrollment_by_enrollment_and_examination_schedule_ids(examination_schedule_id, enrollment_id)
    check_the_enrollments_has_just_started(enrollment.examination_schedule.start_date, "assign")

    size_of_committee = db.session.query(Committee).join(Committee.members). \
        filter(Committee.enrollment_id == enrollment.id).count()

    if size_of_committee >= limit_of_committtee:
        abort(400, "The committee is full!")

    if check_the_project_supervisor_is_in_committee(enrollment.id, project_supervisor.id):
        abort(400, "You have already in this committee!")

    enrollment.committee.members.append(project_supervisor)
    db.session.add(enrollment)
    db.session.commit()

    return {"message": "You have just assigned yourself to committee!"}


@bp.delete('/<int:examination_schedule_id>/enrollments/<int:enrollment_id>/')
@bp.input(TemporaryProjectSupervisorSchema)
@bp.output(MessageSchema)
def delete_yourself_from_committee(examination_schedule_id: int, enrollment_id: int, data: dict) -> dict:
    # this code will be removed
    project_supervisor = db.session.query(ProjectSupervisor).filter(ProjectSupervisor.id == data['id']).first()
    if project_supervisor is None:
        abort(404, "ProjectSupervisor doesn't exist!")
    ################

    enrollment = get_enrollment_by_enrollment_and_examination_schedule_ids(examination_schedule_id, enrollment_id)
    check_the_enrollments_has_just_started(enrollment.examination_schedule.start_date, "delete")

    if not check_the_project_supervisor_is_in_committee(enrollment.id, project_supervisor.id):
        abort(400, "You are not assigned to this committee!")

    enrollment.committee.members.remove(project_supervisor)
    db.session.commit()
    return {"message": "You have just removed from committee!"}