# http://flask.pocoo.org/
# FLASK_APP=wrfeed FLASK_DEBUG=1 WRFEED_SETTINGS=development.cfg python3 -m flask run -p 5002
# FLASK_APP=wrfeed WRFEED_SETTINGS=production.cfg python3 -m flask run
from sqlalchemy.engine import create_engine
from flask import Flask, send_from_directory, abort, g, jsonify
from wrfeed.controllers.berichte import create_feed


app = Flask(__name__)
app.config.from_envvar('WRFEED_SETTINGS')


def get_db():
    """Opens a new database connection if there is none yet for the
    current application context.
    """
    if not hasattr(g, 'db'):
        g.db_engine = create_engine(app.config['DATABASE_URI'])
        g.db = g.db_engine.connect()
    return g.db


@app.teardown_appcontext
def close_db(error):
    """Closes the database again at the end of the request."""
    if hasattr(g, 'db'):
        g.db.close()


@app.route("/")
def hello():
    return send_from_directory('templates', 'index.html')  # actually, this is no template


@app.route("/berichte/alle")
def alle():
    """Handles URLs like
    http://127.0.0.1:5000/berichte/alle
    http://www.winterrodeln.org/feed/berichte/alle
    """
    return app.response_class(create_feed(get_db(), app.config['FEEDENTRYLIMIT']), mimetype='application/atom+xml')


@app.route("/berichte/bahn/<bahn>")
def bahn(bahn):
    """Handles URLs like
    http://127.0.0.1:5000/berichte/bahn/kemater_alm
    http://www.winterrodeln.org/feed/berichte/bahn/kemater_alm
    """
    return app.response_class(create_feed(get_db(), app.config['FEEDENTRYLIMIT'], page_title=bahn),
                              mimetype='application/atom+xml')


@app.route("/berichte/bahnen/<bahnen>")
def bahnen(bahnen):
    """Handles URLs like
    http://127.0.0.1:5000/berichte/bahnen/5+280+251
    http://www.winterrodeln.org/feed/berichte/bahnen/5+280+251
    """
    page_ids = bahnen.split('+')
    try:
        page_ids = [int(page_id) for page_id in page_ids]
    except ValueError:
        abort(400) # bad request
    return app.response_class(create_feed(get_db(), app.config['FEEDENTRYLIMIT'], page_ids=page_ids),
                              mimetype='application/atom+xml')


@app.route("/berichte/region/<region>")
def region(region):
    """Handles URLs like
    http://www.winterrodeln.org/feed/berichte/region/osttirol
    """
    return app.response_class(create_feed(get_db(), app.config['FEEDENTRYLIMIT'], region_name=region),
                              mimetype='application/atom+xml')