# app/schemas/schema.py
import json
from pydantic import BaseModel, field_validator
from typing import Optional, Dict, Any, Literal, List
from datetime import datetime

class VasSchemaBase(BaseModel):
    name: Optional[str] = None
    description: Optional[str] = None
    schema_json: Optional[Dict[str, Any]] = None
    @field_validator("schema_json", mode="before")
    def normalize_json_field(cls, v):
        if v is None:
            return None
        if isinstance(v, str):
            try:
                return json.loads(v)
            except Exception:
                return {}
        return v
    
class VasSchemaCreate(VasSchemaBase):
    name: str
    description: str
    schema_json: Dict[str, Any]

class VasSchemaUpdate(VasSchemaBase):
    pass

class VasSchemaOut(VasSchemaBase):
    id: int
    
    created_at: datetime
    updated_at: datetime

    model_config = {
        "from_attributes": True
    }