from base import *
from forum import const
from django.contrib.contenttypes.models import ContentType
from django.contrib.auth.models import User as DjangoUser, AnonymousUser as DjangoAnonymousUser
from django.db.models import Q
try:
    from hashlib import md5
except:
    import md5
import string
from random import Random

from django.utils.translation import ugettext as _
import django.dispatch


QUESTIONS_PER_PAGE_CHOICES = (
   (10, u'10'),
   (30, u'30'),
   (50, u'50'),
)

class UserManager(CachedManager):
    def get_site_owner(self):
        return self.all().order_by('date_joined')[0]

class AnonymousUser(DjangoAnonymousUser):
    def get_visible_answers(self, question):
        return question.answers.filter(deleted=False)

    def can_view_deleted_post(self, post):
        return False

    def can_vote_up(self):
        return False

    def can_vote_down(self):
        return False

    def can_flag_offensive(self, post=None):
        return False

    def can_view_offensive_flags(self, post=None):
        return False

    def can_comment(self, post):
        return False

    def can_like_comment(self, comment):
        return False

    def can_edit_comment(self, comment):
        return False

    def can_delete_comment(self, comment):
        return False

    def can_accept_answer(self, answer):
        return False

    def can_edit_post(self, post):
        return False

    def can_retag_questions(self):
        return False

    def can_close_question(self, question):
        return False

    def can_reopen_question(self, question):
        return False

    def can_delete_post(self, post):
        return False

    def can_upload_files(self):
        return False

class User(BaseModel, DjangoUser):
    is_approved = models.BooleanField(default=False)
    email_isvalid = models.BooleanField(default=False)
    email_key = models.CharField(max_length=32, null=True)
    reputation = DenormalizedField(default=1)

    gold = DenormalizedField(default=0)
    silver = DenormalizedField(default=0)
    bronze = DenormalizedField(default=0)

    questions_per_page = models.SmallIntegerField(choices=QUESTIONS_PER_PAGE_CHOICES, default=10)
    hide_ignored_questions = models.BooleanField(default=False)
    
    last_seen = models.DateTimeField(default=datetime.datetime.now)
    real_name = models.CharField(max_length=100, blank=True)
    website = models.URLField(max_length=200, blank=True)
    location = models.CharField(max_length=100, blank=True)
    date_of_birth = models.DateField(null=True, blank=True)
    about = models.TextField(blank=True)
    
    objects = UserManager()

    @property
    def gravatar(self):
        return md5(self.email).hexdigest()

    def save(self, *args, **kwargs):
        if self.reputation < 0:
            self.reputation = 1

        super(User, self).save(*args, **kwargs)

    def get_absolute_url(self):
        return self.get_profile_url()

    def get_messages(self):
        messages = []
        for m in self.message_set.all():
            messages.append(m.message)
        return messages

    def delete_messages(self):
        self.message_set.all().delete()

    def get_profile_url(self):
        return "/%s%d/%s" % (_('users/'), self.id, slugify(self.username))

    def get_profile_link(self):
        profile_link = u'<a href="%s">%s</a>' % (self.get_profile_url(),self.username)
        return mark_safe(profile_link)

    def get_vote_count_today(self):
        today = datetime.date.today()
        return self.votes.filter(voted_at__range=(today - datetime.timedelta(days=1), today)).count()

    def get_up_vote_count(self):
        return self.votes.filter(vote=1).count()

    def get_down_vote_count(self):
        return self.votes.filter(vote=-1).count()

    def get_reputation_by_upvoted_today(self):
        today = datetime.datetime.now()
        sum = self.reputes.filter(
                models.Q(reputation_type=TYPE_REPUTATION_GAIN_BY_UPVOTED) |
                models.Q(reputation_type=TYPE_REPUTATION_LOST_BY_UPVOTE_CANCELED),
                reputed_at__range=(today - datetime.timedelta(days=1), today)).aggregate(models.Sum('value'))

        if sum.get('value__sum', None) is not None: return sum['value__sum']
        return 0

    def get_flagged_items_count_today(self):
        today = datetime.date.today()
        return self.flaggeditems.filter(flagged_at__range=(today - datetime.timedelta(days=1), today)).count()

    def get_visible_answers(self, question):
        if self.is_superuser:
            return question.answers
        else:
            return question.answers.filter(models.Q(deleted=False) | models.Q(deleted_by=self))

    def can_view_deleted_post(self, post):
        return self.is_superuser or post.author == self

    def can_vote_up(self):
        return self.reputation >= int(settings.REP_TO_VOTE_UP) or self.is_superuser

    def can_vote_down(self):
        return self.reputation >= int(settings.REP_TO_VOTE_DOWN) or self.is_superuser

    def can_flag_offensive(self, post=None):
        if post is not None and post.author == self:
            return False
        return self.is_superuser or self.reputation >= int(settings.REP_TO_FLAG)

    def can_view_offensive_flags(self, post=None):
        if post is not None and post.author == self:
            return True
        return self.is_superuser or self.reputation >= int(settings.REP_TO_VIEW_FLAGS)

    def can_comment(self, post):
        return self == post.author or self.reputation >= int(settings.REP_TO_COMMENT
        ) or self.is_superuser or (post.__class__.__name__ == "Answer" and self == post.question.author)

    def can_like_comment(self, comment):
        return self != comment.user and (self.reputation >= int(settings.REP_TO_LIKE_COMMENT) or self.is_superuser)

    def can_edit_comment(self, comment):
        return (comment.user == self and comment.added_at >= datetime.datetime.now() - datetime.timedelta(minutes=60)
        ) or self.is_superuser

    def can_delete_comment(self, comment):
        return self == comment.user or self.reputation >= int(settings.REP_TO_DELETE_COMMENTS) or self.is_superuser

    def can_accept_answer(self, answer):
        return self.is_superuser or self == answer.question.author

    def can_edit_post(self, post):
        return self.is_superuser or self == post.author or self.reputation >= int(settings.REP_TO_EDIT_OTHERS
        ) or (post.wiki and self.reputation >= int(settings.REP_TO_EDIT_WIKI))

    def can_retag_questions(self):
        return self.reputation >= int(settings.REP_TO_RETAG)

    def can_close_question(self, question):
        return self.is_superuser or (self == question.author and self.reputation >= int(settings.REP_TO_CLOSE_OWN)
        ) or self.reputation >= int(settings.REP_TO_CLOSE_OTHERS)

    def can_reopen_question(self, question):
        return self.is_superuser or (self == question.author and self.reputation >= settings.REP_TO_REOPEN_OWN)

    def can_delete_post(self, post):
        return self.is_superuser or (self == post.author and (post.__class__.__name__ == "Answer" or
        not post.answers.filter(~Q(author=self)).count()))

    def can_upload_files(self):
        return self.is_superuser or self.reputation >= int(settings.REP_TO_UPLOAD)

    class Meta:
        app_label = 'forum'

class Activity(GenericContent):
    """
    We keep some history data for user activities
    """
    user = models.ForeignKey(User)
    activity_type = models.SmallIntegerField(choices=TYPE_ACTIVITY)
    active_at = models.DateTimeField(default=datetime.datetime.now)
    is_auditted    = models.BooleanField(default=False)

    class Meta:
        app_label = 'forum'
        db_table = u'activity'

    def __unicode__(self):
        return u'[%s] was active at %s' % (self.user.username, self.active_at)

    def save(self, *args, **kwargs):
        super(Activity, self).save(*args, **kwargs)
        if self._is_new:
            activity_record.send(sender=self.activity_type, instance=self)

    @property
    def node(self):
        if self.activity_type in (const.TYPE_ACTIVITY_ANSWER, const.TYPE_ACTIVITY_ASK_QUESTION,
                const.TYPE_ACTIVITY_MARK_ANSWER, const.TYPE_ACTIVITY_COMMENT_QUESTION, const.TYPE_ACTIVITY_COMMENT_ANSWER):
            return self.content_object.leaf

        if self.activity_type in (const.TYPE_ACTIVITY_UPDATE_ANSWER, const.TYPE_ACTIVITY_UPDATE_QUESTION):
            return self.content_object.node.leaf            
            
        raise NotImplementedError()

    @property
    def type_as_string(self):
        if self.activity_type == const.TYPE_ACTIVITY_ASK_QUESTION:
            return _("asked")
        elif self.activity_type  == const.TYPE_ACTIVITY_ANSWER:
            return _("answered")
        elif self.activity_type  == const.TYPE_ACTIVITY_MARK_ANSWER:
            return _("marked an answer")
        elif self.activity_type  == const.TYPE_ACTIVITY_UPDATE_QUESTION:
            return _("edited a question")
        elif self.activity_type == const.TYPE_ACTIVITY_COMMENT_QUESTION:
            return _("commented a question")
        elif self.activity_type == const.TYPE_ACTIVITY_COMMENT_ANSWER:
            return _("commented an answer")
        elif self.activity_type == const.TYPE_ACTIVITY_UPDATE_ANSWER:
            return _("edited an answer")
        elif self.activity_type == const.TYPE_ACTIVITY_PRIZE:
            return _("received badge")
        else:
            raise NotImplementedError()


activity_record = django.dispatch.Signal(providing_args=['instance'])

class SubscriptionSettings(models.Model):
    user = models.OneToOneField(User, related_name='subscription_settings')

    enable_notifications = models.BooleanField(default=True)

    #notify if
    member_joins = models.CharField(max_length=1, default='n', choices=const.NOTIFICATION_CHOICES)
    new_question = models.CharField(max_length=1, default='d', choices=const.NOTIFICATION_CHOICES)
    new_question_watched_tags = models.CharField(max_length=1, default='i', choices=const.NOTIFICATION_CHOICES)
    subscribed_questions = models.CharField(max_length=1, default='i', choices=const.NOTIFICATION_CHOICES)
    
    #auto_subscribe_to
    all_questions = models.BooleanField(default=False)
    all_questions_watched_tags = models.BooleanField(default=False)
    questions_asked = models.BooleanField(default=True)
    questions_answered = models.BooleanField(default=True)
    questions_commented = models.BooleanField(default=False)
    questions_viewed = models.BooleanField(default=False)

    #notify activity on subscribed
    notify_answers = models.BooleanField(default=True)
    notify_reply_to_comments = models.BooleanField(default=True)
    notify_comments_own_post = models.BooleanField(default=True)
    notify_comments = models.BooleanField(default=False)
    notify_accepted = models.BooleanField(default=False)

    class Meta:
        app_label = 'forum'

from forum.utils.time import one_day_from_now

class ValidationHashManager(models.Manager):
    def _generate_md5_hash(self, user, type, hash_data, seed):
        return md5("%s%s%s%s" % (seed, "".join(map(str, hash_data)), user.id, type)).hexdigest()

    def create_new(self, user, type, hash_data=[], expiration=None):
        seed = ''.join(Random().sample(string.letters+string.digits, 12))
        hash = self._generate_md5_hash(user, type, hash_data, seed)

        obj = ValidationHash(hash_code=hash, seed=seed, user=user, type=type)

        if expiration is not None:
            obj.expiration = expiration

        try:
            obj.save()
        except:
            return None
            
        return obj

    def validate(self, hash, user, type, hash_data=[]):
        try:
            obj = self.get(hash_code=hash)
        except:
            return False

        if obj.type != type:
            return False

        if obj.user != user:
            return False

        valid = (obj.hash_code == self._generate_md5_hash(obj.user, type, hash_data, obj.seed))

        if valid:
            if obj.expiration < datetime.datetime.now():
                obj.delete()
                return False
            else:
                obj.delete()
                return True

        return False

class ValidationHash(models.Model):
    hash_code = models.CharField(max_length=255,unique=True)
    seed = models.CharField(max_length=12)
    expiration = models.DateTimeField(default=one_day_from_now)
    type = models.CharField(max_length=12)
    user = models.ForeignKey(User)

    objects = ValidationHashManager()

    class Meta:
        unique_together = ('user', 'type')
        app_label = 'forum'

    def __str__(self):
        return self.hash_code

class AuthKeyUserAssociation(models.Model):
    key = models.CharField(max_length=255,null=False,unique=True)
    provider = models.CharField(max_length=64)
    user = models.ForeignKey(User, related_name="auth_keys")
    added_at = models.DateTimeField(default=datetime.datetime.now)

    class Meta:
        app_label = 'forum'