from datetime import datetime, date
from decimal import Decimal
from operator import itemgetter
from time import time

from django import forms
from django.contrib import admin
from django.contrib.admin import widgets
from django.contrib.admin.options import csrf_protect_m
from django.conf import settings
from django.conf.urls.defaults import patterns, url
from django.core.urlresolvers import reverse
from django.forms import fields
from django.http import HttpResponseRedirect
from django.shortcuts import render_to_response
from django.template.context import RequestContext
from django.utils.functional import update_wrapper
from django.utils.formats import localize
from django.utils.translation import ugettext_lazy as _

from constance import config


NUMERIC_WIDGET = forms.TextInput(attrs={'size': 10})

INTEGER_LIKE = (fields.IntegerField, {'widget': NUMERIC_WIDGET})
STRING_LIKE = (fields.CharField, {'widget': forms.Textarea(attrs={'rows': 3})})

FIELDS = {
    bool: (fields.BooleanField, {'required': False}),
    int: INTEGER_LIKE,
    long: INTEGER_LIKE,
    Decimal: (fields.DecimalField, {'widget': NUMERIC_WIDGET}),
    str: STRING_LIKE,
    unicode: STRING_LIKE,
    datetime: (fields.DateTimeField, {'widget': widgets.AdminSplitDateTime}),
    date: (fields.DateField, {'widget': widgets.AdminDateWidget}),
    time: (fields.TimeField, {'widget': widgets.AdminTimeWidget}),
    float: (fields.FloatField, {'widget': NUMERIC_WIDGET}),
}


class ConstanceForm(forms.Form):
    def __init__(self, *args, **kwargs):
        super(ConstanceForm, self).__init__(*args, **kwargs)
        for name, (default, help_text) in settings.CONSTANCE_CONFIG.items():
            field_class, kwargs = FIELDS[type(default)]
            self.fields[name] = field_class(label=name, **kwargs)

    def save(self):
        for name in self.cleaned_data:
            setattr(config, name, self.cleaned_data[name])


class ConstanceAdmin(admin.ModelAdmin):

    def get_urls(self):
        info = self.model._meta.app_label, self.model._meta.module_name
        return patterns('',
            url(r'^$',
                self.admin_site.admin_view(self.changelist_view),
                name='%s_%s_changelist' % info
            ),
        )

    @csrf_protect_m
    def changelist_view(self, request, extra_context=None):
        form = ConstanceForm(initial=dict((name, getattr(config, name))
                             for name in settings.CONSTANCE_CONFIG))
        if request.method == 'POST':
            form = ConstanceForm(request.POST)
            if form.is_valid():
                form.save()
                self.message_user(request, _('Live settings updated successfully.'))
                return HttpResponseRedirect('.')
        context = {
            'config': [],
            'root_path': self.admin_site.root_path,
            'title': _('Constance config'),
            'app_label': 'constance',
            'opts': Config._meta,
            'form': form,
            'media': self.media + form.media,
        }
        for name, (default, help_text) in settings.CONSTANCE_CONFIG.iteritems():
            value = getattr(config, name)
            context['config'].append({
                'name': name,
                'default': localize(default),
                'help_text': help_text,
                'value': localize(value),
                'modified': value != default,
                'form_field': form[name]
            })
        context['config'].sort(key=itemgetter('name'))
        context_instance = RequestContext(request, current_app=self.admin_site.name)
        return render_to_response('admin/constance/change_list.html',
            context, context_instance=context_instance)

    def has_add_permission(self, *args, **kwargs):
        return False

    def has_delete_permission(self, *args, **kwargs):
        return False

    def has_change_permission(self, *args, **kwargs):
        return True


class Config(object):
    class Meta(object):
        app_label = 'constance'
        module_name = 'config'
        verbose_name_plural = 'config'
        get_ordered_objects = lambda x: False
    _meta = Meta()


admin.site.register([Config], ConstanceAdmin)