from __future__ import annotations

from typing import List, Literal, Optional

from pydantic import BaseModel, Field


class PersonalDetails(BaseModel):
    name: Optional[str] = None
    father_name: Optional[str] = None
    registration_number: Optional[str] = None
    roll_number: Optional[str] = None
    program: Optional[str] = None
    department: Optional[str] = None
    institute: Optional[str] = None


class SubjectResult(BaseModel):
    code: Optional[str] = None
    title: Optional[str] = None
    marks: Optional[float] = None
    credit_hours: Optional[float] = None
    grade: Optional[str] = None
    gpa: Optional[float] = Field(default=None, description="Subject grade points, if shown on the transcript.")


class SemesterResult(BaseModel):
    semester: Optional[str] = None
    subjects: List[SubjectResult] = Field(default_factory=list)
    semester_gpa: Optional[float] = None
    credit_hours: Optional[float] = None


class TranscriptResponse(BaseModel):
    document_status: Literal["transcript", "not_transcript", "unreadable"]
    message: Optional[str] = None
    personal_details: PersonalDetails = Field(default_factory=PersonalDetails)
    semesters: List[SemesterResult] = Field(default_factory=list)
    cgpa: Optional[float] = None
    total_credit_hours: Optional[float] = None