"""
Adds 'target="_blank"' to links, so they open in a new tab.
Filter base urls can be added so that every absolute path link containing the filter is ignored by the extension.

Usage:
MyExtension = get_new_tab_links(["example.org"])
"""
import marko.inline
from marko.helpers import MarkoExtension


def __create_new_tab_links(filters: list[str]):
    class NewTabLinks:
        FILTERS = filters

        def render_link(self, element: marko.inline.Link) -> str:
            dest_lower = element.dest.lower()

            if (dest_lower.startswith("http://") or dest_lower.startswith("https://")) and not any((elem in dest_lower for elem in NewTabLinks.FILTERS)):
                return f"<a href=\"{element.dest}\" target=\"_blank\">{self.render_children(element)}</a>"

            return super().render_link(element)

    return NewTabLinks


def get_new_tab_links(filters: list[str] = None):
    if filters is None:
        filters = []

    return MarkoExtension(
        renderer_mixins=[__create_new_tab_links(filters)]
    )