# -*- coding: UTF-8 -*-
# pylint: disable=C0111,R0903

"""Displays currency exchange rates. Currently, displays currency between GBP and USD/EUR only.

Requires the following python packages:
    * requests

Parameters:
    * currency.interval: Interval in minutes between updates, default is 1.
    * currency.source: Source currency (defaults to "GBP")
    * currency.destination: Comma-separated list of destination currencies (defaults to "USD,EUR")
    * currency.sourceformat: String format for source formatting; Defaults to "{}: {}" and has two variables,
                             the base symbol and the rate list
    * currency.destinationdelimiter: Delimiter used for separating individual rates (defaults to "|")

Note: source and destination names right now must correspond to the names used by the API of http://fixer.io
"""

import bumblebee.input
import bumblebee.output
import bumblebee.engine
import json
import time
try:
    import requests
except ImportError:
    pass

SYMBOL = {
    "GBP": u"£", "EUR": u"€", "USD": u"$"
}

class Module(bumblebee.engine.Module):
    def __init__(self, engine, config):
        super(Module, self).__init__(engine, config,
            bumblebee.output.Widget(full_text=self.price)
        )
        self._data = {}
        self._interval = int(self.parameter("interval", 1))
        self._base = self.parameter("source", "GBP")
        self._symbols = self.parameter("destination", "USD,EUR")
        self._nextcheck = 0

    def price(self, widget):
        if self._data == {}:
            return "?"

        rates = []
        for sym in self._data["rates"]:
            rates.append(u"{}{}".format(self._data["rates"][sym], SYMBOL[sym] if sym in SYMBOL else sym))

        basefmt = u"{}".format(self.parameter("sourceformat", "{}: {}"))
        ratefmt = u"{}".format(self.parameter("destinationdelimiter", "|"))

        return basefmt.format(SYMBOL[self._base] if self._base in SYMBOL else self._base, ratefmt.join(rates))

    def update(self, widgets):
        timestamp = int(time.time())
        if self._nextcheck < int(time.time()):
            self._data = {}
            self._nextcheck = int(time.time()) + self._interval*60
            url = "http://api.fixer.io/latest?symbols={}&base={}".format(self._symbols, self._base)
            try:
                self._data = json.loads(requests.get(url).text)
            except Exception:
                pass

# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4