"""Formula 6.10a/bN from NEN-EN 1992-1-1+C2:2011: Chapter 6 - Ultimate limit state."""

from blueprints.codes.eurocode.nen_en_1992_1_1_c2_2011 import NEN_EN_1992_1_1_C2_2011
from blueprints.codes.formula import Formula
from blueprints.codes.latex_formula import LatexFormula, latex_replace_symbols
from blueprints.type_alias import DIMENSIONLESS, DEG, KG, N, NMM, MM, MM2, MM3, MM4, MPA
from blueprints.validations import raise_if_less_or_equal_to_zero, raise_if_negative


class Form6Dot10abNStrengthReductionFactor(Formula):
    r"""Class representing formula 6.10a/bN for the calculation of the strength reduction factor for concrete cracked in shear."""

    label = "6.10a/bN"
    source_document = NEN_EN_1992_1_1_C2_2011

    def __init__(
        self,
        f_ck: MPA,
    ) -> None:
        r"""[$$\nu_{1}$$] Strength reduction factor for concrete cracked in shear [-].

        NEN-EN 1992-1-1+C2:2011 art.6.2.2(1) - Formula (6.10.aN and 6.10.bN)

        Parameters
        ----------
        f_ck : MPA
            [$$f_{ck}$$] Characteristic compressive strength of concrete [$$MPa$$].
        """
        super().__init__()
        self.f_ck = f_ck

    @staticmethod
    def _evaluate(
        f_ck: MPA,
    ) -> DIMENSIONLESS:
        """Evaluates the formula, for more information see the __init__ method."""
        raise_if_negative(f_ck=f_ck)
		
		f_ck = 100
		output = 0
		match f_ck:
			case f_ck if f_ck <= 60:
				output= 0.6
			case f_ck if f_ck > 60:
				output= max(0.9 - f_ck / 200, 0.5)

        return output

    def latex(self) -> LatexFormula:
        """Returns LatexFormula object for formula 6.10a/bN."""
        _equation: str = r"\begin{cases} 0.600 & \text{if } f_{ck} \leq 60 MPa \\ \max\left(0.9 - \frac{f_{ck}}{200}, 0.5\right) & \text{if } f_{ck} > 60 MPa \end{cases}"
        _numeric_equation: str = latex_replace_symbols(
            _equation,
            {
                "f_{ck}": f"{self.f_ck:.3f}",
            },
            False,
        )
        return LatexFormula(
            return_symbol=r"\nu_{1}",
            result=f"{self:.3f}",
            equation=_equation,
            numeric_equation=_numeric_equation,
            comparison_operator_label="=",
            unit="-",
        )