"""Functions to help export PySR equations to LaTeX."""
import sympy
from sympy.printing.latex import LatexPrinter


class PreciseLatexPrinter(LatexPrinter):
    """Modified SymPy printer with custom float precision."""

    def __init__(self, settings=None, prec=3):
        super().__init__(settings)
        self.prec = prec

    def _print_Float(self, expr):
        # Reduce precision of float:
        reduced_float = sympy.Float(expr, self.prec)
        return super()._print_Float(reduced_float)


def to_latex(expr, prec=3, full_prec=True, **settings):
    """Convert sympy expression to LaTeX with custom precision."""
    settings["full_prec"] = full_prec
    printer = PreciseLatexPrinter(settings=settings, prec=prec)
    return printer.doprint(expr)


def generate_table_environment(columns=["equation", "complexity", "loss"]):
    margins = "".join([("l" if col == "equation" else "c") for col in columns])
    column_map = {
        "complexity": "Complexity",
        "loss": "Loss",
        "equation": "Equation",
        "score": "Score",
    }
    columns = [column_map[col] for col in columns]
    top_pieces = [
        r"\begin{table}[h]",
        r"\begin{center}",
        r"\begin{tabular}{@{}" + margins + r"@{}}",
        r"\toprule",
        " & ".join(columns) + r" \\",
        r"\midrule",
    ]

    bottom_pieces = [
        r"\bottomrule",
        r"\end{tabular}",
        r"\end{center}",
        r"\end{table}",
    ]
    top_latex_table = "\n".join(top_pieces)
    bottom_latex_table = "\n".join(bottom_pieces)

    return top_latex_table, bottom_latex_table