import os
import wsgiref.handlers

from google.appengine.ext import webapp
from google.appengine.ext import db
from google.appengine.ext.webapp import template
from geohash import Geostring, Geohash
from django.utils import simplejson

from model import Tag

def clean(tag):
    if tag.startswith("#"):
        tag = tag[1:]
    return tag

class MainHandler(webapp.RequestHandler):
    def get(self):
        self.show()
        
    def show(self, data={}):
        template_path = os.path.join(os.path.dirname(__file__), 'index.html')
        self.response.headers['Content-Type'] = 'text/html'
        self.response.out.write(template.render(template_path, data))
      
    def post(self):
        name = clean(self.request.get("name"))
        results = Tag.all().filter("name =", name).fetch(1)
        lon = float(self.request.get("longitude"))
        lat = float(self.request.get("latitude"))

        geostring = str(Geohash((lon, lat)))
        if results:
            tag = results[0]
            tag.name = name
            tag.geostring = geostring
            msg = "Location for %s updated." % name       
        else:
            tag = Tag(name = name, geostring = geostring)
            msg = "Location for %s added." % name
            
        tag.put()
        self.show({"msg":msg})

class JSONHandler(webapp.RequestHandler):
    def get(self):
        name = clean(self.request.get("tag"))
        
        results = Tag.all().filter("name =", name).fetch(1)
        data = None
        for result in results:
            point = Geohash(result.geostring).point()
            data = {"name": result.name,
                "longitude": point[0],
                "latitude": point[1]
                }
        
        data = simplejson.dumps(data)
        if self.request.get("callback"):
            data = "%s(%s)" % (self.request.get("callback"), data)
        self.response.out.write(data)

class BoundsHandler(webapp.RequestHandler):
    def get(self):
        rget = self.request.get
        southwest = str(Geohash((float(rget("swlon")), float(rget("swlat")))))
        northeast = str(Geohash((float(rget("nelon")), float(rget("nelat")))))
        
        results = db.GqlQuery("select * from Tag where geostring > :2 and geostring < :1", northeast, southwest)
        data = []
        for result in results:
            point = Geohash(result.geostring).point()
            data.append({"name":result.name,"longitude":point[0],"latitude":point[1]})

        data = simplejson.dumps(data)
        if self.request.get("callback"):
            data = "%s(%s)" % (self.request.get("callback"), data)
        self.response.out.write(data)

if __name__ == '__main__':
    application = webapp.WSGIApplication([
        ('/', MainHandler), 
        ('/tag.json', JSONHandler),
        ('/bounds.json', BoundsHandler)
        ], debug=True)
    wsgiref.handlers.CGIHandler().run(application)