from flask import Flask
from flask import make_response
from flask import render_template
from flask import request
import feedparser
import json
import urllib
import urllib2
import datetime

app = Flask(__name__)

RSS_FEEDS = { 'bbc': 'http://feeds.bbci.co.uk/news/rss.xml',
              'cnn': 'http://rss.cnn.com/rss/edition.rss'}

DEFAULTS = {'publication':'bbc', 
            'city':'London, UK',
            'currency_from' : 'GBP',
            'currency_to' : 'USD'}

WEATHER_URL = 'http://api.openweathermap.org/data/2.5/' \
              'weather?q={}&units=metric&appid=9504c0c840ef1f147f111a088b290341'
CURRENCY_URL = 'https://openexchangerates.org//api/latest.json?' \
               'app_id=3435756597b94d05aab8e63e46551e30'

def get_news(query):
    if not query or query.lower() not in RSS_FEEDS:
        publication = "bbc"
    else:
        publication = query.lower()
    feed = feedparser.parse(RSS_FEEDS[publication])
    return feed['entries']

def get_weather(query):
    query = urllib.quote(query)
    url = WEATHER_URL.format(query)
    data = urllib2.urlopen(url).read()
    parsed = json.loads(data)
    weather = None
    if parsed.get("weather"):
        weather = {"description":
        parsed["weather"][0]["description"],
        "temperature":parsed["main"]["temp"],
        "city":parsed["name"],
        'country': parsed['sys']['country']
        }
    return weather

def get_rate(frm, to):
    all_currency = urllib2.urlopen(CURRENCY_URL).read()
    parsed = json.loads(all_currency).get('rates')
    frm_rate = parsed.get(frm.upper())
    to_rate = parsed.get(to.upper())
    return (to_rate/frm_rate, parsed.keys()) 

def get_values_with_fallback(key):
	if request.args.get(key):
		return request.args.get(key)
	if request.cookies.get(key):
		return request.cookies.get(key)


@app.route("/")
def home():

    # get customized headlines, based on user input or default
    publication = get_values_with_fallback('publication')
    articles = get_news(publication)

    # get customized weather based on user input or default
    city = get_values_with_fallback('city')
    weather = get_weather(city)

    # get customized currency based on user input or default
    currency_from = get_values_with_fallback("currency_from")
    currency_to = get_values_with_fallback("currency_to")
    rate, currencies = get_rate(currency_from, currency_to)
    
    response = make_response(render_template("home.html",
        articles=articles,
        weather=weather,
        currency_from=currency_from,
        currency_to=currency_to,
        rate=rate,
        currencies=sorted(currencies)))
    expires = datetime.datetime.now() + datetime.timedelta(days=365)
    response.set_cookie("publication", publication, expires=expires)
    response.set_cookie("city", city, expires=expires)
    response.set_cookie("currency_from",
        currency_from, expires=expires)
    response.set_cookie("currency_to", currency_to, expires=expires)
    return response


if __name__ == '__main__':
    app.run(port=5000, debug=True)