from dataclasses import dataclass, field
import uuid
import time

@dataclass
class BaseModel:
    id: str = field(init=False)
    created_at: float = field(init=False)
    updated_at: float = field(init=False)

    def __post_init__(self):
        self.id = str(uuid.uuid4())
        now = time.time()
        self.created_at = now
        self.updated_at = now

    def touch(self):
        self.updated_at = time.time()

    def to_dict(self):
        return {
            'id': self.id,
            'created_at': self.created_at,
            'updated_at': self.updated_at
        }

    @classmethod
    def _apply_base_fields(cls, obj, d: dict):
        obj.id = d.get('id', obj.id)
        obj.created_at = d.get('created_at', obj.created_at)
        obj.updated_at = d.get('updated_at', obj.updated_at)
        return obj