text: #       Licensed to the Apache Software Foundation (ASF) under one
  #       or more contributor license agreements.  See the NOTICE file
  #       distributed with this work for additional information
  #       regarding copyright ownership.  The ASF licenses this file
  #       to you under the Apache License, Version 2.0 (the
  #       "License"); you may not use this file except in compliance
  #       with the License.  You may obtain a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #       Unless required by applicable law or agreed to in writing,
  #       software distributed under the License is distributed on an
  #       "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  #       KIND, either express or implied.  See the License for the
  #       specific language governing permissions and limitations
  #       under the License.
  
  from __future__ import unicode_literals
  from __future__ import absolute_import
  import difflib
  import functools
  import re
  from datetime import datetime
  from random import randint
  
  from tg import tmpl_context as c, app_globals as g
  from tg import config as tg_config
  from pymongo.errors import DuplicateKeyError
  
  from ming import schema
  from ming.orm import FieldProperty, ForeignIdProperty, Mapper, session, state
  from ming.orm.declarative import MappedClass
  
  from allura import model as M
  from allura.model.timeline import ActivityObject
  from allura.model.types import MarkdownCache
  from allura.lib import helpers as h
  from allura.lib import utils
  import six
  
  config = utils.ConfigProxy(
      common_suffix='forgemail.domain')
  
  
  class Globals(MappedClass):
  
      class __mongometa__:
          name = str('blog-globals')
          session = M.project_orm_session
          indexes = ['app_config_id']
  
      type_s = 'BlogGlobals'
      _id = FieldProperty(schema.ObjectId)
      app_config_id = ForeignIdProperty(
          'AppConfig', if_missing=lambda: c.app.config._id)
      external_feeds = FieldProperty([str])
  
  
  class BlogPostSnapshot(M.Snapshot):
  
      class __mongometa__:
          name = str('blog_post_snapshot')
      type_s = 'Blog Post Snapshot'
  
      def original(self):
          return BlogPost.query.get(_id=self.artifact_id)
  
      def shorthand_id(self):
          orig = self.original()
          if not orig:
              return None
          return '%s#%s' % (orig.shorthand_id(), self.version)
  
      def url(self):
          orig = self.original()
          if not orig:
              return None
          return orig.url() + '?version=%d' % self.version
  
      def index(self):
          orig = self.original()
          if not orig:
              return None
          result = super(BlogPostSnapshot, self).index()
          result.update(
              title='%s (version %d)' % (orig.title, self.version),
              type_s=self.type_s,
              text=self.data.text)
          return result
  
      @property
      def html_text(self):
          """A markdown processed version of the page text"""
          return g.markdown_wiki.convert(self.data.text)
  
      @property
      def email_address(self):
          orig = self.original()
          if not orig:
              return None
          return orig.email_address
  
  
  class BlogPost(M.VersionedArtifact, ActivityObject):
  
      class __mongometa__:
          name = str('blog_post')
          history_class = BlogPostSnapshot
          unique_indexes = [('app_config_id', 'slug')]
          indexes = [
              # for [[project_blog_posts]] macro
              ('app_config_id', 'state', 'timestamp'),
              # for [[neighborhood_blog_posts]] macro
              ('neighborhood_id', 'state', 'timestamp'),
          ]
  
      type_s = 'Blog Post'
  
      title = FieldProperty(str, if_missing='Untitled')
      text = FieldProperty(str, if_missing='')
      text_cache = FieldProperty(MarkdownCache)
      timestamp = FieldProperty(datetime, if_missing=datetime.utcnow)
      slug = FieldProperty(str)
      state = FieldProperty(
          schema.OneOf('draft', 'published'), if_missing='draft')
      neighborhood_id = ForeignIdProperty('Neighborhood', if_missing=None)
  
      link_regex = re.compile(r'^[^#]+$')  # no target in the link, meaning no comments
  
      @property
      def activity_name(self):
          return 'a blog post'
  
      @property
      def activity_extras(self):
          d = ActivityObject.activity_extras.fget(self)
          d.update(summary=self.title)
          return d
  
      def author(self):
          '''The author of the first snapshot of this BlogPost'''
          return M.User.query.get(_id=self.get_version(1).author.id) or M.User.anonymous()
  
      def _get_date(self):
          return self.timestamp.date()
  
      def _set_date(self, value):
          self.timestamp = datetime.combine(value, self.time)
      date = property(_get_date, _set_date)
  
      def _get_time(self):
          return self.timestamp.time()
  
      def _set_time(self, value):
          self.timestamp = datetime.combine(self.date, value)
      time = property(_get_time, _set_time)
  
      @property
      def html_text(self):
          return g.markdown.cached_convert(self, 'text')
  
      @property
      def html_text_preview(self):
          """Return an html preview of the BlogPost text.
  
          Truncation happens at paragraph boundaries to avoid chopping markdown
          in inappropriate places.
  
          If the entire post is one paragraph, the full text is returned.
          If the entire text is <= 400 chars, the full text is returned.
          Else, at least 400 chars are returned, rounding up to the nearest
          whole paragraph.
  
          If truncation occurs, a hyperlink to the full text is appended.
  
          """
          # Splitting on spaces or single lines breaks isn't sufficient as some
          # markup can span spaces and single line breaks. Converting to HTML
          # first and *then* truncating doesn't work either, because the
          # ellipsis tag ends up orphaned from the main text.
          ellipsis = '... [read more](%s)' % self.url()
          paragraphs = self.text.replace('\r', '').split('\n\n')
          total_length = 0
          for i, p in enumerate(paragraphs):
              total_length += len(p)
              if total_length >= 400:
                  break
          text = '\n\n'.join(paragraphs[:i + 1])
          return g.markdown.convert(text + (ellipsis if i + 1 < len(paragraphs)
                                            else ''))
  
      @property
      def email_address(self):
          if self.config.options.get('AllowEmailPosting', True):
              domain = self.email_domain
              return '%s@%s%s' % (self.title.replace('/', '.'), domain, config.common_suffix)
          else:
              return tg_config.get('forgemail.return_path')
  
      @staticmethod
      def make_base_slug(title, timestamp):
          slugsafe = ''.join(
              ch.lower()
              for ch in title.replace(' ', '-')
              if ch.isalnum() or ch == '-')
          return '%s/%s' % (
              timestamp.strftime('%Y/%m'),
              slugsafe)
  
      def make_slug(self):
          base = BlogPost.make_base_slug(self.title, self.timestamp)
          self.slug = base
          while True:
              try:
                  session(self).insert_now(self, state(self))
                  return self.slug
              except DuplicateKeyError:
                  self.slug = base + '-%.3d' % randint(0, 999)
  
      def url(self):
          return self.app.url + self.slug + '/'
  
      def shorthand_id(self):
          return self.slug
  
      def index(self):
          result = super(BlogPost, self).index()
          result.update(
              title=self.title,
              type_s=self.type_s,
              state_s=self.state,
              snippet_s='%s: %s' % (self.title, h.text.truncate(self.text, 200)),
              text=self.text)
          return result
  
      def get_version(self, version):
          HC = self.__mongometa__.history_class
          return HC.query.find({'artifact_id': self._id, 'version': int(version)}).one()
  
      def commit(self, subscribe=False):
          activity = functools.partial(g.director.create_activity, c.user,
                                       related_nodes=[c.project], tags=['blog'])
          if subscribe:
              self.subscribe()
          super(BlogPost, self).commit()
          if self.version > 1:
              v1 = self.get_version(self.version - 1)
              v2 = self
              la = [line + '\n' for line in v1.text.splitlines()]
              lb = [line + '\n' for line in v2.text.splitlines()]
              diff = ''.join(difflib.unified_diff(
                  la, lb,
                  'v%d' % v1.version,
                  'v%d' % v2.version))
              description = diff
              if v1.state != 'published' and v2.state == 'published':
                  activity('created', self)
                  M.Feed.post(self, self.title, self.text, author=self.author(),
                              pubdate=self.get_version(1).timestamp)
                  description = self.text
                  subject = '%s created post %s' % (
                      c.user.username, self.title)
              elif v2.state == 'published':
                  feed_item = self.feed_item()
                  if feed_item:
                      feed_item.title = self.title
                      feed_item.description = g.markdown.convert(self.text)
                  else:
                      M.Feed.post(self, self.title, self.text, author=self.author(),
                                  pubdate=self.get_version(1).timestamp)
                  if v1.title != v2.title:
                      activity('renamed', self)
                      subject = '%s renamed post %s to %s' % (
                          c.user.username, v1.title, v2.title)
                  else:
                      activity('modified', self)
                      subject = '%s modified post %s' % (
                          c.user.username, self.title)
              elif v1.state == 'published' and v2.state == 'draft':
                  feed_item = self.feed_item()
                  if feed_item:
                      feed_item.delete()
          else:
              description = self.text
              subject = '%s created post %s' % (
                  c.user.username, self.title)
              if self.state == 'published':
                  activity('created', self)
                  M.Feed.post(self, self.title, self.text,
                              author=self.author(), pubdate=self.timestamp)
          if self.state == 'published':
              M.Notification.post(
                  artifact=self, topic='metadata', text=description, subject=subject)
  
      @classmethod
      def new(cls, **kw):
          post = cls()
          subscribe = kw.pop('subscribe', False)
          for k, v in six.iteritems(kw):
              setattr(post, k, v)
          post.neighborhood_id = c.project.neighborhood_id
          post.make_slug()
          post.commit(subscribe=subscribe)
          M.Thread.new(
              discussion_id=post.app_config.discussion_id,
              ref_id=post.index_id(),
              subject='%s discussion' % post.title)
          return post
  
      def __json__(self, posts_limit=None, is_export=False):
          return dict(super(BlogPost, self).__json__(posts_limit=posts_limit, is_export=is_export),
                      author=self.author().username,
                      title=self.title,
                      url=h.absurl('/rest' + self.url()),
                      text=self.text,
                      labels=list(self.labels),
                      state=self.state)
  
      def feed_item(self):
          return M.Feed.query.get(ref_id=self.index_id(),
                                  link=self.link_regex)
  
      def delete(self):
          feed_item = self.feed_item()
          if feed_item:
              feed_item.delete()
          super(BlogPost, self).delete()
  
      @classmethod
      def attachment_class(cls):
          return BlogAttachment
  
  
  class BlogAttachment(M.BaseAttachment):
      ArtifactType = BlogPost
      thumbnail_size = (100, 100)
  
      class __mongometa__:
          polymorphic_identity = str('BlogAttachment')
      attachment_type = FieldProperty(str, if_missing='BlogAttachment')
  
  
  Mapper.compile_all()
  