# Converts a TeX file into a PNG/SVG file.
template = r"""
\documentclass{{standalone}}
    \usepackage{{amsmath}}
    % TODO: Add user packages here.
\begin{{document}}
    % The user content goes here.
    {content}

\end{{document}}
"""


def render(user: str, source: str, png: bool = True) -> str:
    import tempfile
    import subprocess

    fmt = template.format(content=source)

    tmp = tempfile.NamedTemporaryFile(delete=False)
    print(tmp.name)
    tmp.write(bytes(fmt, encoding="utf8"))
    tmp.close()
    # Parse our templated file thru' LaTeX and dvipng.
    # TODO: Allow arbitrary DPI and foreground color.
    subprocess.run(["latex", tmp.name], cwd="/tmp")
    if png:
        print("PNG")
        subprocess.run(["dvipng", "-D", "1000", tmp.name + ".dvi", "-bg", "Transparent",
                       "-fg", "rgb .75 .75 .75", "-o", tmp.name + ".png"], cwd="/tmp")

        return tmp.name + ".png"

    # TODO:
    raise NotImplementedError("SVG support is not currently implemented")