from typing import Dict, List, Optional

from pydantic import BaseModel

class Lesson(BaseModel):

"""Represents a lesson within a course"""

lesson_number: int # Sequential lesson number (1, 2, 3, etc.)

title: str # Lesson title

lesson_link: Optional[str] = None # URL link to the lesson

class Course(BaseModel):

"""Represents a complete course with its lessons"""

title: str # Full course title (used as unique identifier)

course_link: Optional[str] = None # URL link to the course

instructor: Optional[str] = None # Course instructor name (optional metadata)

lessons: List[Lesson] = [] # List of lessons in this course

class CourseChunk(BaseModel):

"""Represents a text chunk from a course for vector storage"""

content: str # The actual text content

course_title: str # Which course this chunk belongs to

lesson_number: Optional[int] = None # Which lesson this chunk is from

chunk_index: int # Position of this chunk in the document