"""

Extra HTML Widget classes

"""

import time

import datetime

import re

from django.forms.widgets import Widget, Select

from django.utils import datetime_safe

from django.utils.dates import MONTHS

from django.utils.safestring import mark_safe

from django.utils.formats import get_format

from django.conf import settings

__all__ = ('SelectDateWidget',)

RE_DATE = re.compile(r'(\d{4})-(\d\d?)-(\d\d?)$')

class SelectDateWidget(Widget):

    """

    A Widget that splits date input into three <select> boxes.

    This also serves as an example of a Widget that has more than one HTML

    element and hence implements value_from_datadict.

    """

    none_value = (0, '---')

    month_field = '%s_month'

    day_field = '%s_day'

    year_field = '%s_year'

    def __init__(self, attrs=None, years=None, required=True):

        # years is an optional list/tuple of years to use in the "year" select box.

        self.attrs = attrs or {}

        self.required = required

        if years:

            self.years = years

        else:

            this_year = datetime.date.today().year

            self.years = range(this_year, this_year+10)

    def render(self, name, value, attrs=None):

        try:

            year_val, month_val, day_val = value.year, value.month, value.day

        except AttributeError:

            year_val = month_val = day_val = None

            if isinstance(value, basestring):

                if settings.USE_L10N:

                    try:

                        input_format = get_format('DATE_INPUT_FORMATS')[0]

                        # Python 2.4 compatibility:

                        #     v = datetime.datetime.strptime(value, input_format)

                        # would be clearer, but datetime.strptime was added in 

                        # Python 2.5

                        v = datetime.datetime(*(time.strptime(value, input_format)[0:6]))

                        year_val, month_val, day_val = v.year, v.month, v.day

                    except ValueError:

                        pass

                else:

                    match = RE_DATE.match(value)

                    if match:

                        year_val, month_val, day_val = [int(v) for v in match.groups()]

        choices = [(i, i) for i in self.years]

        year_html = self.create_select(name, self.year_field, value, year_val, choices)

        choices = MONTHS.items()

        month_html = self.create_select(name, self.month_field, value, month_val, choices)

        choices = [(i, i) for i in range(1, 32)]

        day_html = self.create_select(name, self.day_field, value, day_val,  choices)

        format = get_format('DATE_FORMAT')

        escaped = False

        output = []

        for char in format:

            if escaped:

                escaped = False

            elif char == '\\':

                escaped = True

            elif char in 'Yy':

                output.append(year_html)

            elif char in 'bFMmNn':

                output.append(month_html)

            elif char in 'dj':

                output.append(day_html)

        return mark_safe(u'\n'.join(output))

    def id_for_label(self, id_):

        return '%s_month' % id_

    id_for_label = classmethod(id_for_label)

    def value_from_datadict(self, data, files, name):

        y = data.get(self.year_field % name)

        m = data.get(self.month_field % name)

        d = data.get(self.day_field % name)

        if y == m == d == "0":

            return None

        if y and m and d:

            if settings.USE_L10N:

                input_format = get_format('DATE_INPUT_FORMATS')[0]

                try:

                    date_value = datetime.date(int(y), int(m), int(d))

                except ValueError:

                    pass

                else:

                    date_value = datetime_safe.new_date(date_value)

                    return date_value.strftime(input_format)

            else:

                return '%s-%s-%s' % (y, m, d)

        return data.get(name, None)

    def create_select(self, name, field, value, val, choices):

        if 'id' in self.attrs:

            id_ = self.attrs['id']

        else:

            id_ = 'id_%s' % name

        if not (self.required and val):

            choices.insert(0, self.none_value)

        local_attrs = self.build_attrs(id=field % id_)

        s = Select(choices=choices)

        select_html = s.render(field % name, val, local_attrs)

        return select_html