"""
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
from . import utils


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

        def render_link(self, element: marko.inline.Link) -> str:
            if utils.is_foreign_url(element.dest, 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)]
    )