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# Copyright 2011-2012 GRNET S.A. All rights reserved.
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# 
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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# 
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#   1. Redistributions of source code must retain the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer.
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# 
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#   2. Redistributions in binary form must reproduce the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer in the documentation and/or other materials
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#      provided with the distribution.
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# 
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# 
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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import hashlib
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import uuid
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from time import asctime
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from datetime import datetime, timedelta
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from base64 import b64encode
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from django.db import models
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from django.contrib.auth.models import User, UserManager
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from astakos.im.settings import DEFAULT_USER_LEVEL, INVITATIONS_PER_LEVEL, AUTH_TOKEN_DURATION
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class AstakosUser(User):
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    """
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    Extends ``django.contrib.auth.models.User`` by defining additional fields.
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    """
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    # Use UserManager to get the create_user method, etc.
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    objects = UserManager()
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    affiliation = models.CharField('Affiliation', max_length=255, blank=True)
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    provider = models.CharField('Provider', max_length=255, blank=True)
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    #for invitations
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    user_level = DEFAULT_USER_LEVEL
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    level = models.IntegerField('Inviter level', default=user_level)
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    invitations = models.IntegerField('Invitations left', default=INVITATIONS_PER_LEVEL[user_level])
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    auth_token = models.CharField('Authentication Token', max_length=32,
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                                  null=True, blank=True)
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    auth_token_created = models.DateTimeField('Token creation date', null=True)
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    auth_token_expires = models.DateTimeField('Token expiration date', null=True)
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    updated = models.DateTimeField('Update date')
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    is_verified = models.BooleanField('Is verified?', default=False)
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    # ex. screen_name for twitter, eppn for shibboleth
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    third_party_identifier = models.CharField('Third-party identifier', max_length=255, null=True, blank=True)
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    @property
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    def realname(self):
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        return '%s %s' %(self.first_name, self.last_name)
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    @realname.setter
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    def realname(self, value):
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        parts = value.split(' ')
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        if len(parts) == 2:
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            self.first_name = parts[0]
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            self.last_name = parts[1]
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        else:
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            self.last_name = parts[0]
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    @property
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    def invitation(self):
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        try:
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            return Invitation.objects.get(username=self.email)
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        except Invitation.DoesNotExist:
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            return None
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    def save(self, update_timestamps=True, **kwargs):
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        if update_timestamps:
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            if not self.id:
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                # set username
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                while not self.username:
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                    username =  uuid.uuid4().hex[:30]
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                    try:
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                        AstakosUser.objects.get(username = username)
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                    except AstakosUser.DoesNotExist, e:
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                        self.username = username
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                self.is_active = False
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                if not self.provider:
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                    self.provider = 'local'
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                self.date_joined = datetime.now()
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            self.updated = datetime.now()
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        super(AstakosUser, self).save(**kwargs)
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    def renew_token(self):
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        md5 = hashlib.md5()
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        md5.update(self.username)
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        md5.update(self.realname.encode('ascii', 'ignore'))
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        md5.update(asctime())
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        self.auth_token = b64encode(md5.digest())
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        self.auth_token_created = datetime.now()
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        self.auth_token_expires = self.auth_token_created + \
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                                  timedelta(hours=AUTH_TOKEN_DURATION)
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    def __unicode__(self):
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        return self.username
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class Invitation(models.Model):
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    """
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    Model for registring invitations
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    """
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    inviter = models.ForeignKey(AstakosUser, related_name='invitations_sent',
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                                null=True)
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    realname = models.CharField('Real name', max_length=255)
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    username = models.CharField('Unique ID', max_length=255)
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    code = models.BigIntegerField('Invitation code', db_index=True)
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    #obsolete: we keep it just for transfering the data
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    is_accepted = models.BooleanField('Accepted?', default=False)
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    is_consumed = models.BooleanField('Consumed?', default=False)
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    created = models.DateTimeField('Creation date', auto_now_add=True)
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    #obsolete: we keep it just for transfering the data
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    accepted = models.DateTimeField('Acceptance date', null=True, blank=True)
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    consumed = models.DateTimeField('Consumption date', null=True, blank=True)
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    def consume(self):
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        self.is_consumed = True
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        self.consumed = datetime.now()
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        self.save()
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    def __unicode__(self):
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        return '%s -> %s [%d]' % (self.inviter, self.username, self.code)