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import re

import markdown
import dateutil.parser

from django import template
from django.template.defaultfilters import stringfilter
from django.utils.encoding import force_unicode
from django.utils.safestring import mark_safe

register = template.Library()

@register.filter
def to_date_obj(date_string):
    date_parsed = dateutil.parser.parse(date_string)
    return date_parsed

@register.filter
def un_alphabetise(name):
    """
    >>> un_alphabetise("Turkle, Sherry")
    "Sherry Turkle"
    >>> un_alphabetise("Sherry Turkle")
    "Sherry Turkle"
    """
    try:
        name, prefix = name.split(',')
        return prefix.strip() + ' ' + name.strip()
    except ValueError:
        return name

@register.filter
def natural_join(val, cjn="and"):
    """
    Gracefully joins a list of things.

    >>> natural_join(['pierre'])
    'pierre'

    >>> natural_join(['pierre', 'paul'])
    'pierre and paul'

    >>> natural_join(['pierre', 'paul', 'jacques'])
    'pierre, paul and jacques'

    >>> natural_join(['pierre', 'paul', 'jacques'], cnj="et")
    'pierre, paul et jacques'
    """
    
    def to_string(object):
        if isinstance(object, str) or isinstance(object, unicode):
            return object
        try:
            return object.__unicode__()
        except AttributeError:
            return repr(object)
    
    if len(val) == 0:
        return u""
    
    val = [un_alphabetise(to_string(object)) for object in val]
    return " ".join((", ".join(val[0:-1]), "%s %s" % (cjn, val[-1]))) if len(val) > 1 else val[0]



@register.filter(is_safe=True)
@stringfilter
def markdown_filter(value):
    extensions = ["extra", ]

    return mark_safe(markdown.markdown(force_unicode(value),
                                       extensions))

p_surrounds = re.compile(r'<p>(.*)</p>')

@register.filter(is_safe=True)
@stringfilter
def no_p(value):
    value = value.strip()
    match = p_surrounds.findall(value)
    if len(match) == 0:
        return value
    return match[0]

@register.filter
def stripExtension(value):
    import re
    return re.split("md|html$", u"%s" % value)[0]