from typing import Optional

from sqlalchemy.orm import Session

from app.application.notifications_repository import NotificationsRepository
from app.domain.entities.notification_entity import NotificationEntity


class NotificationsService:
    def __init__(self, db: Session):
        self.notifications_repository = NotificationsRepository(db)

    def get_all(self) -> list[NotificationEntity]:
        notifications = self.notifications_repository.get_all()
        return [
            NotificationEntity(
                id=notification.id,
                text=notification.text,
                datetime_notification=notification.datetime_notification,
                is_read=notification.is_read,
                user_id=notification.user_id,
                type_id=notification.type_id,
                course_id=notification.course_id,
            ) for notification in notifications
        ]

    def get_by_id(self, notification_id: int) -> Optional[NotificationEntity]:
        notification = self.notifications_repository.get_by_id(notification_id)
        if notification:
            return NotificationEntity(
                id=notification.id,
                text=notification.text,
                datetime_notification=notification.datetime_notification,
                is_read=notification.is_read,
                user_id=notification.user_id,
                type_id=notification.type_id,
                course_id=notification.course_id,
            )

        return None

    def create(self, notification: NotificationEntity) -> NotificationEntity:
        notification_model = Notification(
            text=notification.text,
            datetime_notification=notification.datetime_notification,
            is_read=notification.is_read,
            user_id=notification.user_id,
            type_id=notification.type_id,
            course_id=notification.course_id,
        )
        created_notification = self.notifications_repository.create(notification_model)
        return NotificationEntity(
            id=created_notification.id,
            text=created_notification.text,
            datetime_notification=created_notification.datetime_notification,
            is_read=created_notification.is_read,
            user_id=created_notification.user_id,
            type_id=created_notification.type_id,
            course_id=created_notification.course_id,
        )

    def update(self, notification_id: int, notification: NotificationEntity) -> Optional[NotificationEntity]:
        notification_model = self.notifications_repository.get_by_id(notification_id)
        if notification_model:
            notification_model.text = notification.text
            notification_model.datetime_notification = notification.datetime_notification
            notification_model.is_read = notification.is_read
            notification_model.user_id = notification.user_id
            notification_model.type_id = notification.type_id
            notification_model.course_id = notification.course_id
            updated_notification = self.notifications_repository.update(notification_model)
            return NotificationEntity(
                id=updated_notification.id,
                text=updated_notification.text,
                datetime_notification=updated_notification.datetime_notification,
                is_read=updated_notification.is_read,
                user_id=updated_notification.user_id,
                type_id=updated_notification.type_id,
                course_id=updated_notification.course_id,
            )

        return None

    def delete(self, notification_id: int) -> bool:
        return self.notifications_repository.delete(notification_id) is not None