from abc import ABC, abstractmethod


class Layer(ABC):
    @property
    @abstractmethod
    def R(self) -> float: ...


class MaterialLayer(Layer):
    def __init__(self, thermal_coefficient: float, thickness: float):
        self.thermal_coefficient = thermal_coefficient
        self.thickness = thickness

    @property
    def R(self) -> float:
        return self.thickness / self.thermal_coefficient


class FixedRLayer(Layer):
    def __init__(self, r_value: float):
        self.r_value = r_value

    @property
    def R(self) -> float:
        return self.r_value


class Interface(ABC):
    @property
    @abstractmethod
    def HT(self) -> float: ...


class Surface(Interface):
    def __init__(self, name: str, area: float, b: float = 1.0):
        self.name = name
        self.area = area
        self.b = b

    @property
    @abstractmethod
    def U(self) -> float: ...

    @property
    def HT(self) -> float:
        return self.b * self.U * self.area


class LinearThermalBridge(Interface):
    def __init__(self, name: str, length: float, psi: float):
        self.name = name
        self.length = length
        self.psi = psi

    @property
    def HT(self) -> float:
        return self.psi * self.length


class PointThermalBridge(Interface):
    def __init__(self, name: str, chi: float):
        self.name = name
        self.chi = chi

    @property
    def HT(self) -> float:
        return self.chi


class LayeredSurface(Surface):
    def __init__(
        self,
        name: str,
        area: float,
        layers: list[Layer],
        r_surface_1: float,
        r_surface_2: float,
        b: float = 1.0,
    ):
        super().__init__(name, area, b)
        self.layers = layers
        self.r_surface_1 = r_surface_1
        self.r_surface_2 = r_surface_2

    @property
    def U(self) -> float:
        R_layers = sum(layer.R for layer in self.layers)
        R = self.r_surface_1 + R_layers + self.r_surface_2
        return 1 / R


class FixedUSurface(Surface):
    def __init__(self, name: str, area: float, u_value: float, b: float = 1.0):
        super().__init__(name, area, b)
        self.u_value = u_value

    @property
    def U(self) -> float:
        return self.u_value