##
##  coinfetch-api-cb - Coinbase API plugin for coinfetch
##  Copyright (C) 2017 Delwink, LLC
##
## Redistributions, modified or unmodified, in whole or in part, must retain
## applicable copyright or other legal privilege notices, these conditions, and
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## assembler(s), and contributors of this work hereby grant to any person who
## obtains a copy of this work in any form:
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## 2. A perpetual, worldwide, non-exclusive, royalty-free, irrevocable patent
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from cfetch import register_ticker, NoSuchKindException, NoSuchPairException
from cfetch import Ticker

class CoinbaseTicker(Ticker):
    def __init__(self, path):
        super().__init__(path)

    def get_pair(self, a, b):
        return '{}-{}'.format(a.upper(), b.upper())

    def get_pair_data(self, response, pair=None):
        return response.json()

    def get_rate_pow(self, a, b, amt, power, kind):
        if kind not in ('spot', 'buy', 'sell'):
            raise NoSuchKindException(kind)

        r = get(self.path + self.get_pair(a, b) + '/' + kind,
                headers={'CB-VERSION': '2017-09-19'})

        res = self.get_pair_data(r, (a, b))
        print(r.text)
        if 'data' not in res:
            raise NoSuchPairException('{}/{}'.format(a, b))

        if 'errors' in res:
            raise Exception(res['errors'])

        return (float(res['data']['amount']) ** power) * amt

    def get_rate(self, a, b, amt=1, kind='spot'):
        return super().get_rate(a, b, amt, kind)

register_ticker('cb', 'The Coinbase ticker (built-in)',
                CoinbaseTicker('https://api.coinbase.com/v2/prices/'))