# vim: set fileencoding=utf-8 ts=4 shiftwidth=4 softtabstop=4 expandtab:

from django import template
from django.template.defaultfilters import stringfilter
from oembed.core import replace

register = template.Library()

class IfIsNewNode(template.Node):
    def __init__(self, arg1, arg2, nodelist_true, nodelist_false, negate):
        self.arg1, self.arg2 = arg1, arg2
        self.nodelist_true, self.nodelist_false = nodelist_true, nodelist_false
        self.negate = negate
    def render(self, context):
        try:
            val1 = template.resolve_variable(self.arg1, context)
        except VariableDoesNotExist:
            val1 = ""
        try:
            val2 = template.resolve_variable(self.arg2, context)
        except VariableDoesNotExist:
            val2 = ""
        if (not self.negate and val1 > val2) or (self.negate and val1 <= val2):
            return self.nodelist_true.render(context)
        return self.nodelist_false.render(context)

def do_ifisnew(parser, token, negate):
    "Returns true if message is new"
    args = token.split_contents()
    if len(args) != 3:
        raise template.TemplateSyntaxError("'is_new' needs two arguments.")
    end_tag = 'end' + args[0]
    nodelist_true = parser.parse(('else', end_tag))
    token = parser.next_token()
    if token.contents == 'else':
        nodelist_false = parser.parse((end_tag,))
        parser.delete_first_token()
    else:
        nodelist_false = template.NodeList()
    node = IfIsNewNode(args[1], args[2], nodelist_true, nodelist_false, negate)
    return node

@register.tag
def ifisnew(parser, token):
    return do_ifisnew(parser, token, False)

@register.tag
def ifisnotnew(parser, token):
    return do_ifisnew(parser, token, True)


@stringfilter
def my_oembed(input, args):
    args = args.split()
    if len(args) > 1:
        raise template.TemplateSyntaxError("Oembed tag takes only one (option" \
            "al) argument: WIDTHxHEIGHT, where WIDTH and HEIGHT are positive " \
            "integers.")
    if len(args) == 1:
        width, height = args[0].lower().split('x')
        if not width and height:
            raise template.TemplateSyntaxError("Oembed's optional WIDTHxHEIGH" \
                "T argument requires WIDTH and HEIGHT to be positive integers.")
    else:
        width, height = None, None
    kwargs = {}
    if width and height:
        kwargs['max_width'] = width
        kwargs['max_height'] = height
        
    return replace(input, **kwargs)

register.filter('my_oembed', my_oembed)