# -*- coding: utf-8  -*-

from __future__ import unicode_literals

from earwigbot.wiki import NS_TEMPLATE

__all__ = ["get_attribution_info"]

ATTRIB_TEMPLATES = {
    "enwiki": {
        "CC-notice", "Cc-notice",
        "Citation-attribution",
        "Free-content attribution", "Open-source attribution",
        "Source-attribution",
    }
}

def get_attribution_info(site, page):
    """Check to see if the given page has some kind of attribution info.

    If yes, return a tuple of (attribution template name, template URL).
    If no, return None.
    """
    if site.name not in ATTRIB_TEMPLATES:
        return None

    base = ATTRIB_TEMPLATES[site.name]
    prefix = site.namespace_id_to_name(NS_TEMPLATE)
    templates = base | {prefix + ":" + tpl for tpl in base if ":" not in tpl}

    for template in page.parse().ifilter_templates():
        if template.name.matches(templates):
            name = unicode(template.name).strip()
            title = name if ":" in name else prefix + ":" + name
            return name, site.get_page(title).url
    return None