# -*-  coding: utf-8 -*-

"""

    __init__.py

"""

from flask import Flask, request, jsonify, render_template, make_response, g

import os

import logging

from logging.handlers import RotatingFileHandler

from classes.database import db

from config import DefaultConfig

from classes import views

#from classes import models

from classes import oauth

__all__ = ['create_app', 'getDBInstance']

DEFAULT_APP_NAME = __name__

DEFAULT_MODULES = (

    (views.frontend, ''),

    (views.api, '/api'),

    (views.user, '/users'),

    (views.context, '/contexts'),

    (views.sweet, '/sweets'),

    (views.app, '/apps'),

    (views.Oauth, '/oauth')

)

def create_app(config=None, app_name=None, modules=None):

    if app_name is None:

        app_name = DEFAULT_APP_NAME

    if modules is None:

        modules = DEFAULT_MODULES

    app = Flask(app_name)

    configure_app(app, config)

    configure_logging(app)

    configure_errorhandlers(app)

    configure_extensions(app)

    #configure_beforehandlers(app)

    configure_modules(app, modules)

    return app

def configure_app(app, config):

    app.config.from_object(DefaultConfig())

    if config is not None:

        app.config.from_object(config)

    app.config.from_envvar('APP_CONFIG', silent=True)

def configure_modules(app, modules):

    for module, url_prefix in modules:

        app.register_module(module, url_prefix=url_prefix)

def configure_extensions(app):

    db.init_app(app)

    db.app = app

    oauth.init_app(app)

# return the current db instance

# TODO: is this needed so much?

def getDBInstance():

    return db

def configure_errorhandlers(app):

    if app.testing:

        return

    # TODO: with all these request can we send back the respective HTTP status

    # codes instead of 200?

    @app.errorhandler(404)

    def not_found(error):

        response = make_response()

        response.status_code = 404

        if request.is_xhr:

            response.data = jsonify(error=error)

        else:

            response.data = render_template('errors/404.html')

        return response

    @app.errorhandler(403)

    def forbidden(error):

        response = make_response()

        response.status_code = 403

        if request.is_xhr:

            response.data = jsonify(error=error)

        else:

            response.data = render_template('errors/403.html')

        return response

    @app.errorhandler(401)

    def unauthorized(error):

        response = make_response()

        response.status_code = 401

        if request.is_xhr:

            response.data = jsonify(error=error)

        else:

            response.data = render_template('errors/401.html')

        return response

    @app.errorhandler(400)

    def bad_request(error):

        response = make_response()

        response.status_code = 400

        # Check if we have any custom error messages

        #if g.error:

        #    print 'g.error:'

        #    print g.error

        #    error = g.error

        if request.is_xhr:

            response.data = jsonify(error=error)

        else:

            response.data = render_template('errors/400.html', error=error)

        return response

    @app.errorhandler(500)

    def server_error(error):

        response = make_response()

        response.status_code = 500

        if request.is_xhr:

            response.data = jsonify(error=error)

        else:

            response.data = render_template('errors/500.html')

        return response

def configure_logging(app):

    formatter = logging.Formatter('%(asctime)s %(levelname)s: %(message)s '

                                  '[in %(pathname)s:%(lineno)d]')

    # Also error can be sent out via email. So we can also have a SMTPHandler?

    log_file = app.config['LOG_FILE']

    max_size = 1024 * 1024 * 20 # Max Size for a log file: 20MB

    log_handler = RotatingFileHandler(log_file, maxBytes=max_size,

                                      backupCount=10)

    if app.config.has_key('LOG_LEVEL'):

        log_level = app.config['LOG_LEVEL'] or 'ERROR'

    else:

        log_level = 'ERROR'

    log_handler.setLevel(log_level)

    log_handler.setFormatter(formatter)

    app.logger.addHandler(log_handler)