import os
import logging
import logging.handlers

logger = logging.getLogger("")
logger.setLevel(logging.DEBUG)
handler = logging.handlers.RotatingFileHandler("flask.log",
    maxBytes=3000000, backupCount=2)
formatter = logging.Formatter(
    '[%(asctime)s] {%(filename)s:%(lineno)d} %(levelname)s - %(message)s')
handler.setFormatter(formatter)
logger.addHandler(handler)
logging.getLogger().addHandler(logging.StreamHandler())

from flask import Flask, send_from_directory, request
from app.sql.common import db, connection_url

from app.settings import app_cfg
from app.controllers.graph_controller import GraphView
from app.controllers.page_controller import PageView
from app.controllers.tile_controller import TileView
from app.controllers.upload_controller import UploadView

def create_app(script_info=None):
  """
  functional pattern for creating the flask app
  """
  logging.debug("Starting Swimmer server...")
  app = Flask(__name__, static_folder=app_cfg.DIR_STATIC, static_url_path='/static')
  app.config['SQLALCHEMY_DATABASE_URI'] = connection_url
  app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
  app.config['SERVER_NAME'] = app_cfg.SERVER_NAME
  app.url_map.strict_slashes = False

  db.init_app(app)

  GraphView.register(app, route_prefix='/api/v1/')
  PageView.register(app, route_prefix='/api/v1/')
  TileView.register(app, route_prefix='/api/v1/')
  UploadView.register(app, route_prefix='/api/v1/')

  index_html = 'index.html'

  @app.errorhandler(404)
  def page_not_found(e):
    return app.send_static_file(index_html), 200

  @app.route('/', methods=['GET'])
  def index():
    return app.send_static_file('index.html')

  @app.route('/favicon.ico')
  def favicon():
    return send_from_directory(os.path.join(app.root_path, 'static/img/'),
      'favicon.ico', mimetype='image/vnd.microsoft.icon')

  @app.shell_context_processor
  def shell_context():
    return { 'app': app, 'db': db }

  return app