from typing import Optional
from pydantic import BaseModel


class CameraParameters(BaseModel):
    focal_length: float
    sensor_width: float
    sensor_height: float
    resolution_width: int
    resolution_height: int
    principal_point: tuple[float, float] | None = None
    distortion_coefficients: list[float] | None = None

    def get_principal_point(self) -> tuple[float, float]:
        if self.principal_point:
            return self.principal_point
        return (self.resolution_width / 2.0, self.resolution_height / 2.0)