from typing import Optional

from sqlalchemy.orm import Session

from app.application.lessons_repository import LessonsRepository
from app.domain.entities.lessons_entity import LessonEntity
from app.domain.models.lessons import Lesson


class LessonsService:
    def __init__(self, db: Session):
        self.lessons_repository = LessonsRepository(db)

    def get_all(self) -> list[LessonEntity]:
        lessons = self.lessons_repository.get_all()
        return [
            LessonEntity(
                id=lesson.id,
                title=lesson.title,
                description=lesson.description,
                course_id=lesson.course_id,
            ) for lesson in lessons
        ]

    def get_by_id(self, lesson_id: int) -> Optional[LessonEntity]:
        lesson = self.lessons_repository.get_by_id(lesson_id)
        if lesson:
            return LessonEntity(
                id=lesson.id,
                title=lesson.title,
                description=lesson.description,
                course_id=lesson.course_id,
            )

        return None

    def create(self, lesson: LessonEntity) -> LessonEntity:
        lesson_model = Lesson(
            title=lesson.title,
            description=lesson.description,
            course_id=lesson.course_id,
        )
        created_lesson = self.lessons_repository.create(lesson_model)
        return LessonEntity(
            id=created_lesson.id,
            title=created_lesson.title,
            description=created_lesson.description,
            course_id=created_lesson.course_id,
        )

    def update(self, lesson_id: int, lesson: LessonEntity) -> Optional[LessonEntity]:
        lesson_model = self.lessons_repository.get_by_id(lesson_id)
        if lesson_model:
            lesson_model.title = lesson.title
            lesson_model.description = lesson.description
            lesson_model.course_id = lesson.course_id
            updated_lesson = self.lessons_repository.update(lesson_model)
            return LessonEntity(
                id=updated_lesson.id,
                title=updated_lesson.title,
                description=updated_lesson.description,
                course_id=updated_lesson.course_id,
            )

        return None

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