from datetime import datetime

from django import forms
from django.db import models
from django.core.cache import cache
from django.contrib import admin
from django.contrib.auth.models import User
from django.utils.translation import ugettext_lazy as _
from django.template.defaultfilters import slugify
from django.core.urlresolvers import reverse

GOOGLE_PROFILE_URL = 'http://www.google.com/s2/favicons?domain_url=%s'
SN_CACHE_KEY = 'elsewhere_sn_data'
IM_CACHE_KEY = 'elsewhere_im_data'


class Network(models.Model):
    """ Model for storing networks. """

    name = models.CharField(max_length=100)
    url = models.URLField(verify_exists=False)
    identifier = models.CharField(max_length=100)
    icon = models.CharField(max_length=100, blank=True)

    class Meta:
        abstract = True

    def __unicode__(self):
        return self.name

class SocialNetwork(Network):
    class Meta:
        verbose_name_plural = 'social networks'

    def save(self, *args, **kwargs):
        cache.delete(SN_CACHE_KEY)
        super(SocialNetwork, self).save(*args, **kwargs)

class InstantMessenger(Network):
    class Meta:
        verbose_name_plural = 'instant messanger networks'

    def save(self, *args, **kwargs):
        cache.delete(IM_CACHE_KEY)
        super(InstantMessenger, self).save(*args, **kwargs)

# the following makes the social / IM networks data act as lists.

def SocialNetworkData():
    cache_key = SN_CACHE_KEY
    data = cache.get(cache_key)

    if not data:
        data = []

        try:
            for network in SocialNetwork.objects.all():
                data.append({
                    'id': slugify(network.name),
                    'name': network.name,
                    'url': network.url,
                    'identifier': network.identifier,
                    'icon': network.icon
                })
            cache.set(cache_key, data, 60*60*24)
        except:
            # if we haven't yet synced the database, don't worry about this yet
            pass

    return data

def InstantMessengerData():
    cache_key = IM_CACHE_KEY
    data = cache.get(cache_key)

    if not data:
        data = []
        try:
            for network in InstantMessenger.objects.all():
                data.append({
                    'id': slugify(network.name),
                    'name': network.name,
                    'url': network.url,
                    'icon': network.icon
                })
            cache.set(cache_key, data, 60*60*24)
        except:
            # if we haven't yet synced the database, don't worry about this yet
            pass

    return data

class ProfileManager:
    """ Handle raw data for lists of profiles."""
    data = {}

    def _get_choices(self):
        """ List of choices for profile select fields. """
        return [(props['id'], props['name']) for props in self.data]
    choices = property(_get_choices)

class SocialNetworkManager(ProfileManager):
    data = SocialNetworkData()
sn_manager = SocialNetworkManager()

class InstantMessengerManager(ProfileManager):
    data = InstantMessengerData()
im_manager = InstantMessengerManager()

class Profile(models.Model):
    """ Common profile model pieces. """
    data_manager = None

    date_added = models.DateTimeField(_('date added'), auto_now_add=True)
    date_verified = models.DateTimeField(_('date verified'), default=datetime.now)
    is_verified = models.BooleanField(default=False)

    class Meta:
        abstract = True

    def _get_data_item(self):
        # Find profile data for this profile id
        for network in self.data_manager.data:
            if network['id'] == self.network_id:
                return network
        return None
    data_item = property(_get_data_item)

    def _get_name(self):
        # Profile display name
        return self.data_item['name']
    name = property(_get_name)
 
    def _get_url(self):
        # Profile URL with username
        return self.data_item['url'] % self.username
    url = property(_get_url)
    
    def _get_icon_name(self):
        # Icon name
        return self.data_item['icon']
    icon_name = property(_get_icon_name)
 
    def _get_icon(self):
        # Icon URL or link to Google icon service
        if self.icon_name:
            print reverse('elsewhere_img', args=[self.icon_name])
            print self.icon_name
            return reverse('elsewhere_img', args=[self.icon_name])
        return GOOGLE_PROFILE_URL % self.url
    icon = property(_get_icon)

class SocialNetworkProfile(Profile):
    data_manager = sn_manager

    user = models.ForeignKey(User, db_index=True, related_name='social_network_profiles')
    network_id = models.CharField(max_length=16, choices=data_manager.choices, db_index=True)
    username = models.CharField(max_length=64)
    
    def __unicode__(self):
        return self.network_id

class SocialNetworkForm(forms.ModelForm):

    class Meta:
        model = SocialNetworkProfile
        fields = ('network_id', 'username')


class InstantMessengerProfile(Profile):
    data_manager = im_manager

    user = models.ForeignKey(User, db_index=True, related_name='instant_messenger_profiles')
    network_id = models.CharField(max_length=16, choices=data_manager.choices, db_index=True)
    username = models.CharField(max_length=64)

    def __unicode__(self):
        return self.username

class InstantMessengerForm(forms.ModelForm):

    class Meta:
        model = InstantMessengerProfile
        fields = ('network_id', 'username')


class WebsiteProfile(models.Model):
    user = models.ForeignKey(User, db_index=True, related_name='website_profiles')
    name = models.CharField(max_length=64)
    url = models.URLField(verify_exists=True)

    def __unicode__(self):
        return self.url

    def _get_icon(self):
        # No known icons! Just return the Google service URL.
        return GOOGLE_PROFILE_URL % self.url
    icon = property(_get_icon)


class WebsiteForm(forms.ModelForm):

    class Meta:
        model = WebsiteProfile
        fields = ('name', 'url')