from typing import Optional

from sqlalchemy.orm import Session

from app.application.lectures_repository import LecturesRepository
from app.domain.entities.lectures_entity import LectureEntity
from app.domain.models.lectures import Lecture


class LecturesService:
    def __init__(self, db: Session):
        self.lectures_repository = LecturesRepository(db)

    def get_all(self) -> list[LectureEntity]:
        lectures = self.lectures_repository.get_all()
        return [
            LectureEntity(
                id=lecture.id,
                text=lecture.text,
                image=lecture.image,
                number=lecture.number,
                step_id=lecture.step_id
            ) for lecture in lectures
        ]

    def get_by_id(self, lecture_id: int) -> Optional[LectureEntity]:
        lecture = self.lectures_repository.get_by_id(lecture_id)
        if lecture:
            return LectureEntity(
                id=lecture.id,
                text=lecture.text,
                image=lecture.image,
                number=lecture.number,
                step_id=lecture.step_id
            )

        return None

    def create(self, lecture: LectureEntity) -> LectureEntity:
        lecture_model = Lecture(
            text=lecture.text,
            image=lecture.image,
            number=lecture.number,
            step_id=lecture.step_id
        )
        created_lecture = self.lectures_repository.create(lecture_model)
        return LectureEntity(
            id=created_lecture.id,
            text=created_lecture.text,
            image=created_lecture.image,
            number=created_lecture.number,
            step_id=created_lecture.step_id
        )

    def update(self, lecture_id: int, lecture: LectureEntity) -> Optional[LectureEntity]:
        lecture_model = self.lectures_repository.get_by_id(lecture_id)
        if lecture_model:
            lecture_model.text = lecture.text
            lecture_model.image = lecture.image
            lecture_model.number = lecture.number
            lecture_model.step_id = lecture.step_id
            updated_lecture = self.lectures_repository.update(lecture_model)
            return LectureEntity(
                id=updated_lecture.id,
                text=updated_lecture.text,
                image=updated_lecture.image,
                number=updated_lecture.number,
                step_id=updated_lecture.step_id
            )

        return None

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