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from datetime import datetime

import logging

import urllib

import urllib2

from google.appengine.ext import db

SVN_PATH_DASHBOARD = ("http://src.chromium.org/viewvc/chrome/trunk/tools/"

    "dashboards/")

class DashboardFile(db.Model):

    name = db.StringProperty()

    data = db.BlobProperty()

    date = db.DateTimeProperty(auto_now_add=True)

    @classmethod

    def get_files(cls, name, limit=1):

        query = DashboardFile.all()

        if name:

            query = query.filter("name =", name)

        return query.order("-date").fetch(limit)

    @classmethod

    def add_file(cls, name, data):

        file = DashboardFile()

        file.name = name

        file.data = db.Blob(data)

        file.put()

        logging.debug("Dashboard file saved, name: %s.", name)

        return file

    @classmethod

    def grab_file_from_svn(cls, name):

        logging.debug("Grab file from SVN, name: %s.", name)

        url = SVN_PATH_DASHBOARD + urllib.quote_plus(name)

        logging.info("Grab file from SVN, url: %s.", url)

        try:

            file = urllib2.urlopen(url)

            if not file:

                logging.error("Failed to grab dashboard file: %s.", url)

                return None

            return file.read()

        except urllib2.HTTPError, e:

            logging.error("Failed to grab dashboard file: %s", str(e))

        except urllib2.URLError, e:

            logging.error("Failed to grab dashboard file: %s", str(e))

        return None

    @classmethod

    def update_file(cls, name):

        data = cls.grab_file_from_svn(name)

        if not data:

            return None

        logging.info("Got file from SVN.")

        files = cls.get_files(name)

        if not files:

            logging.info("No existing file, added as new file.")

            return cls.add_file(name, data)

        logging.debug("Updating existing file.")

        file = files[0]

        file.data = data

        file.date = datetime.now()

        file.put()

        logging.info("Dashboard file replaced, name: %s.", name)

        return file

    @classmethod

    def delete_file(cls, name):

        files = cls.get_files(name)

        if not files:

            logging.warning("File not found, name: %s.", name)

            return False

        for file in files:

            file.delete()

        return True