from django import template
from django.utils.safestring import mark_safe

from whoisdb.helpers import getWhoisObjectFields, findHandleFromStr
from whoisdb.validators import HandleValidator


register = template.Library()

@register.filter
def linkObject(value):
    return mark_safe('<a href="%s">%s</a>' % (value.get_absolute_url(), str(value)))

@register.filter
def tryLinkHandle(handle):
    try:
        if not handle:
            raise ValueError()
        HandleValidator()(str(handle))
        obj = findHandleFromStr(handle)
        if obj:
            return linkObject(obj)
    except:
        pass

    return handle



@register.filter
def linkObjects(value):
    links = []
    for obj in value:
        if hasattr(obj, "get_absolute_url"):
            links.append('<a href="%s">%s</a>' % (obj.get_absolute_url(), str(obj)))
        else:
            links.append(str(obj))

    return mark_safe(", ".join(links))

@register.filter
def getFields(value, user):
    owner = value.canEdit(user)

    return getWhoisObjectFields(value, owner)


@register.filter
def userCanEdit(value, user):
    if hasattr(value, "canEdit"):
        return value.canEdit(user)
    return False