from sqlmodel import SQLModel, Field, Relationship, text
from datetime import datetime
from typing import Optional, List
from sqlalchemy import Column, String, Text

class Subject(SQLModel, table=True):
    __tablename__ = "subject"
    id: Optional[int] = Field(default=None, primary_key=True)
    name: str = Field(max_length=100)
    color: str = Field(default="#6366f1")
    created_at: datetime = Field(default_factory=datetime.now)
    error_images: List["ErrorImage"] = Relationship(back_populates="subject")
    evaluations: List["Evaluation"] = Relationship(back_populates="subject")

class ErrorImage(SQLModel, table=True):
    __tablename__ = "error_image"
    id: Optional[int] = Field(default=None, primary_key=True)
    subject_id: int = Field(foreign_key="subject.id")
    date: str = Field(max_length=20, index=True)
    filename: str = Field(max_length=255)
    original_name: str = Field(max_length=255)
    upload_time: datetime = Field(default_factory=datetime.now)
    subject: Subject = Relationship(back_populates="error_images")

class Evaluation(SQLModel, table=True):
    __tablename__ = "evaluation"
    id: Optional[int] = Field(default=None, primary_key=True)
    subject_id: int = Field(foreign_key="subject.id")
    date: str = Field(max_length=20)
    title: str = Field(max_length=200)
    content: str = Field(default="")
    filename: Optional[str] = Field(default=None, max_length=255)
    upload_time: datetime = Field(default_factory=datetime.now)
    subject: Subject = Relationship(back_populates="evaluations")