from jinja2_simple_tags import StandaloneTag

from .hubapp import TreeFileApp

class StaticTag(StandaloneTag):
    tags = {"static"}

    def render(
        self, filename: str = "", hubapp: str | TreeFileApp | None = None
    ):
        """
        If filename starts with '/', interpret the path as relative to hubapp.base_dir,
        otherwise assume the path is relative to the current file.
        """
        static_file = self.context["static_file"]
        h = static_file.hubapp
        if isinstance(hubapp, str):
            h = h.app.hubapps[hubapp]
        elif isinstance(hubapp, TreeFileApp):
            h = hubapp
        del hubapp
        if filename.startswith("/") or h != static_file.hubapp:
            path = h.base_dir / filename.lstrip("/")
        else:
            path = static_file.path.parent / filename
        return h.uri(path)


def get_redis_pass(redis_conf):
    """
    Poor man's redis credentials: read the password from redis_conf.
    Requires redis being configured with a `requirepass` password set.
    """
    prefix = "requirepass "
    with open(redis_conf, "rt") as fh:
        for line in fh:
            if line.startswith(prefix):
                return line[len(prefix) :].rstrip()
    return None