####### moonbay.py
import jinja2
import os
import webapp2
from google.appengine.ext import db

template_dir=os.path.join(os.path.dirname(__file__),'templates')
jinja_env=jinja2.Environment(loader=jinja2.FileSystemLoader(template_dir),autoescape=True)

def blog_key(name='default'):
    return db.Key.from_path('Post',name)

class Handler(webapp2.RequestHandler):
    def render_str(self,template,**param):
        t=jinja_env.get_template(template)
        return t.render(**param)
    def render(self,template,**kw):
        self.response.write(self.render_str(template,**kw))

class Post(db.Model,Handler):
    title=db.StringProperty(required=True)
    content=db.TextProperty(required=True)
    created=db.DateTimeProperty(auto_now_add=True)
    last_modified=db.DateTimeProperty(auto_now=True)
    def render(self):
        self._render_text=self.content.replace('\n','<br>')
        href = '/blog/'+str(self.key().id())
        return self.render_str('u4-post.html',p=self,href=href)

#all posts
class BlogFront(Handler):
    def get(self):
        posts=db.GqlQuery('select * from Post order by created Desc limit 10')
        self.render('u4-contents.html',posts=posts)

#single page for a post
class PostPage(Handler):
    def get(self,post_id):
        key=db.Key.from_path('Post',int(post_id),parent=blog_key())
        post=db.get(key)
        if not post:
            self.error(404)
            return
        else:
            self.render('u4-permalink.html',post=post,parent=blog_key())

#new submit page
class NewPost(Handler):
    def get(self):
        self.render('u4-newpost.html')
    def post(self):
        title=self.request.get('title')
        content=self.request.get('content')
        if title and content:
            p=Post(parent=blog_key(),title=title,content=content)
            p.put()
            self.redirect('/blog/%s'%str(p.key().id()))
        else:
            error='Please enter valid title and content'
            self.render('u4-newpost.html',title=title,content=content,error=error)

app=webapp2.WSGIApplication([
    ('/blog/?',BlogFront),
    ('/blog/([0-9]+)',PostPage),
    ('/blog/newpost',NewPost),
])