# -*- coding: utf-8 -*-
import yaml
from hashlib import sha1
import random
import string
from django.db import models
from django.utils.encoding import smart_unicode, force_str
from django.db.models import permalink
from django.utils.translation import ugettext_lazy as _
from jsonfield import JSONField
from . import app_settings


KEY_SIZE = 30


def make_key(length):
    return ''.join(
        random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits)
        for i in range(length))


class Contact(models.Model):
    created_at = models.DateTimeField(_('submission date'), auto_now_add=True)
    ip = models.IPAddressField(_('IP address'))
    contact = models.CharField(_('contact'), max_length=128)
    form_tag = models.CharField(_('form'), max_length=32, db_index=True)
    body = JSONField(_('body'))
    key = models.CharField(max_length=KEY_SIZE)

    def generate_key(self):
        key = ''
        while not key or Contact.objects.filter(key=key).exists():
            key = make_key(KEY_SIZE)
        self.key = key
        self.save()

    @staticmethod
    def pretty_print(value, for_html=False):
        if type(value) in (tuple, list, dict):
            value = yaml.safe_dump(value, allow_unicode=True, default_flow_style=False)
            if for_html:
                value = smart_unicode(value).replace(u" ", unichr(160))
        return value

    class Meta:
        ordering = ('-created_at',)
        verbose_name = _('submitted form')
        verbose_name_plural = _('submitted forms')

    def __unicode__(self):
        return unicode(self.created_at)

    def digest(self):
        serialized_body = ';'.join(sorted('%s:%s' % item for item in self.body.iteritems()))
        data = '%s%s%s%s%s' % (self.id, self.contact, serialized_body, self.ip, self.form_tag)
        data = force_str(data)
        return sha1(data).hexdigest()

    @permalink
    def update_url(self):
        return 'edit_form', [], {'form_tag': self.form_tag, 'contact_id': self.id, 'key': self.key}


class Attachment(models.Model):
    contact = models.ForeignKey(Contact)
    tag = models.CharField(max_length=64)
    file = models.FileField(upload_to='contact/attachment')

    @models.permalink
    def get_absolute_url(self):
        return 'contact_attachment', [self.contact_id, self.tag]

    @property
    @models.permalink
    def url(self):
        return 'contact_attachment_key', [self.contact_id, self.tag, self.contact.key]

    def __unicode__(self):
        return self.file.name.rsplit('/', 1)[-1]


__import__(app_settings.FORMS_MODULE)