from datetime import datetime
import inspect
import requests
import sys
from threading import Thread
import time
import traceback
import csv
from decimal import Decimal

from electrum.bitcoin import COIN
from electrum.plugins import BasePlugin, hook
from electrum.i18n import _
from electrum.util import PrintError, ThreadJob, timestamp_to_datetime
from electrum.util import format_satoshis


# See https://en.wikipedia.org/wiki/ISO_4217
CCY_PRECISIONS = {'BHD': 3, 'BIF': 0, 'BYR': 0, 'CLF': 4, 'CLP': 0,
                  'CVE': 0, 'DJF': 0, 'GNF': 0, 'IQD': 3, 'ISK': 0,
                  'JOD': 3, 'JPY': 0, 'KMF': 0, 'KRW': 0, 'KWD': 3,
                  'LYD': 3, 'MGA': 1, 'MRO': 1, 'OMR': 3, 'PYG': 0,
                  'RWF': 0, 'TND': 3, 'UGX': 0, 'UYI': 0, 'VND': 0,
                  'VUV': 0, 'XAF': 0, 'XAU': 4, 'XOF': 0, 'XPF': 0}

class ExchangeBase(PrintError):

    def __init__(self, on_quotes, on_history):
        self.history = {}
        self.quotes = {}
        self.on_quotes = on_quotes
        self.on_history = on_history

    def protocol(self):
        return "https"

    def get_json(self, site, get_string):
        url = "".join([self.protocol(), '://', site, get_string])
        response = requests.request('GET', url,
                                    headers={'User-Agent' : 'Electrum'})
        return response.json()

    def get_csv(self, site, get_string):
        url = "".join([self.protocol(), '://', site, get_string])
        response = requests.request('GET', url,
                                    headers={'User-Agent' : 'Electrum'})
        reader = csv.DictReader(response.content.split('\n'))
        return list(reader)

    def name(self):
        return self.__class__.__name__

    def update_safe(self, ccy):
        try:
            self.print_error("getting fx quotes for", ccy)
            self.quotes = self.get_rates(ccy)
            self.print_error("received fx quotes")
            self.on_quotes()
        except Exception, e:
            self.print_error("failed fx quotes:", e)

    def update(self, ccy):
        t = Thread(target=self.update_safe, args=(ccy,))
        t.setDaemon(True)
        t.start()

    def get_historical_rates_safe(self, ccy):
        try:
            self.print_error("requesting fx history for", ccy)
            self.history[ccy] = self.historical_rates(ccy)
            self.print_error("received fx history for", ccy)
            self.on_history()
        except Exception, e:
            self.print_error("failed fx history:", e)

    def get_historical_rates(self, ccy):
        result = self.history.get(ccy)
        if not result and ccy in self.history_ccys():
            t = Thread(target=self.get_historical_rates_safe, args=(ccy,))
            t.setDaemon(True)
            t.start()
        return result

    def history_ccys(self):
        return []

    def historical_rate(self, ccy, d_t):
        return self.history.get(ccy, {}).get(d_t.strftime('%Y-%m-%d'))


class BitcoinAverage(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('api.bitcoinaverage.com', '/ticker/global/all')
        return dict([(r, Decimal(json[r]['last']))
                     for r in json if r != 'timestamp'])

    def history_ccys(self):
        return ['AUD', 'BRL', 'CAD', 'CHF', 'CNY', 'EUR', 'GBP', 'IDR', 'ILS',
                'MXN', 'NOK', 'NZD', 'PLN', 'RON', 'RUB', 'SEK', 'SGD', 'USD',
                'ZAR']

    def historical_rates(self, ccy):
        history = self.get_csv('api.bitcoinaverage.com',
                               "/history/%s/per_day_all_time_history.csv" % ccy)
        return dict([(h['datetime'][:10], h['average'])
                     for h in history])

class BitcoinVenezuela(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('api.bitcoinvenezuela.com', '/')
        rates = [(r, json['BTC'][r]) for r in json['BTC']
                 if json['BTC'][r] is not None]  # Giving NULL for LTC
        return dict(rates)

    def protocol(self):
        return "http"

    def history_ccys(self):
        return ['ARS', 'EUR', 'USD', 'VEF']

    def historical_rates(self, ccy):
        return self.get_json('api.bitcoinvenezuela.com',
                             "/historical/index.php?coin=BTC")[ccy +'_BTC']

class BTCParalelo(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('btcparalelo.com', '/api/price')
        return {'VEF': Decimal(json['price'])}

    def protocol(self):
        return "http"

class Bitso(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('api.bitso.com', '/v2/ticker')
        return {'MXN': Decimal(json['last'])}

    def protocol(self):
        return "http"

class Bitcurex(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('pln.bitcurex.com', '/data/ticker.json')
        pln_price = json['last']
        return {'PLN': Decimal(pln_price)}

class Bitmarket(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('www.bitmarket.pl', '/json/BTCPLN/ticker.json')
        return {'PLN': Decimal(json['last'])}

class BitPay(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('bitpay.com', '/api/rates')
        return dict([(r['code'], Decimal(r['rate'])) for r in json])

class BitStamp(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('www.bitstamp.net', '/api/ticker/')
        return {'USD': Decimal(json['last'])}

class BlockchainInfo(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('blockchain.info', '/ticker')
        return dict([(r, Decimal(json[r]['15m'])) for r in json])

    def name(self):
        return "Blockchain"

class BTCChina(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('data.btcchina.com', '/data/ticker')
        return {'CNY': Decimal(json['ticker']['last'])}

class CaVirtEx(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('www.cavirtex.com', '/api/CAD/ticker.json')
        return {'CAD': Decimal(json['last'])}

class Coinbase(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('coinbase.com',
                             '/api/v1/currencies/exchange_rates')
        return dict([(r[7:].upper(), Decimal(json[r]))
                     for r in json if r.startswith('btc_to_')])

class CoinDesk(ExchangeBase):
    def get_rates(self, ccy):
        dicts = self.get_json('api.coindesk.com',
                              '/v1/bpi/supported-currencies.json')
        json = self.get_json('api.coindesk.com',
                             '/v1/bpi/currentprice/%s.json' % ccy)
        ccys = [d['currency'] for d in dicts]
        result = dict.fromkeys(ccys)
        result[ccy] = Decimal(json['bpi'][ccy]['rate_float'])
        return result

    def history_starts(self):
        return { 'USD': '2012-11-30' }

    def history_ccys(self):
        return self.history_starts().keys()

    def historical_rates(self, ccy):
        start = self.history_starts()[ccy]
        end = datetime.today().strftime('%Y-%m-%d')
        # Note ?currency and ?index don't work as documented.  Sigh.
        query = ('/v1/bpi/historical/close.json?start=%s&end=%s'
                 % (start, end))
        json = self.get_json('api.coindesk.com', query)
        return json['bpi']
        
class Coinsecure(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('api.coinsecure.in', '/v0/noauth/lasttrade')
        return {'INR': Decimal(json['result'][0]['lasttrade'][0][bid][0][rate] / 100.0 )}
        
class itBit(ExchangeBase):
    def get_rates(self, ccy):
        ccys = ['USD', 'EUR', 'SGD']
        json = self.get_json('api.itbit.com', '/v1/markets/XBT%s/ticker' % ccy)
        result = dict.fromkeys(ccys)
        if ccy in ccys:
            result[ccy] = Decimal(json['lastPrice'])
        return result

class LocalBitcoins(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('localbitcoins.com',
                             '/bitcoinaverage/ticker-all-currencies/')
        return dict([(r, Decimal(json[r]['rates']['last'])) for r in json])

class Winkdex(ExchangeBase):
    def get_rates(self, ccy):
        json = self.get_json('winkdex.com', '/api/v0/price')
        return {'USD': Decimal(json['price'] / 100.0)}

    def history_ccys(self):
        return ['USD']

    def historical_rates(self, ccy):
        json = self.get_json('winkdex.com',
                             "/api/v0/series?start_time=1342915200")
        history = json['series'][0]['results']
        return dict([(h['timestamp'][:10], h['price'] / 100.0)
                     for h in history])


class FxPlugin(BasePlugin, ThreadJob):

    def __init__(self, parent, config, name):
        BasePlugin.__init__(self, parent, config, name)
        self.ccy = self.config_ccy()
        self.history_used_spot = False
        self.ccy_combo = None
        self.hist_checkbox = None
        is_exchange = lambda obj: (inspect.isclass(obj)
                                   and issubclass(obj, ExchangeBase)
                                   and obj != ExchangeBase)
        self.exchanges = dict(inspect.getmembers(sys.modules[__name__],
                                                 is_exchange))
        self.set_exchange(self.config_exchange())

    def ccy_amount_str(self, amount, commas):
        prec = CCY_PRECISIONS.get(self.ccy, 2)
        fmt_str = "{:%s.%df}" % ("," if commas else "", max(0, prec))
        return fmt_str.format(round(amount, prec))

    def thread_jobs(self):
        return [self]

    def run(self):
        # This runs from the plugins thread which catches exceptions
        if self.timeout <= time.time():
            self.timeout = time.time() + 150
            self.exchange.update(self.ccy)

    def config_ccy(self):
        '''Use when dynamic fetching is needed'''
        return self.config.get("currency", "EUR")

    def config_exchange(self):
        return self.config.get('use_exchange', 'Blockchain')

    def config_history(self):
        return self.config.get('history_rates', 'unchecked') != 'unchecked'

    def show_history(self):
        return self.config_history() and self.exchange.history_ccys()

    def set_exchange(self, name):
        class_ = self.exchanges.get(name) or self.exchanges.values()[0]
        name = class_.__name__
        self.print_error("using exchange", name)
        if self.config_exchange() != name:
            self.config.set_key('use_exchange', name, True)

        self.exchange = class_(self.on_quotes, self.on_history)
        # A new exchange means new fx quotes, initially empty.  Force
        # a quote refresh
        self.timeout = 0
        self.get_historical_rates()
        #self.on_fx_quotes()

    def on_quotes(self):
        pass

    def on_history(self):
        pass

    @hook
    def exchange_rate(self):
        '''Returns None, or the exchange rate as a Decimal'''
        rate = self.exchange.quotes.get(self.ccy)
        if rate:
            return Decimal(rate)

    @hook
    def format_amount_and_units(self, btc_balance):
        rate = self.exchange_rate()
        return '' if rate is None else "%s %s" % (self.value_str(btc_balance, rate), self.ccy)

    @hook
    def get_fiat_status_text(self, btc_balance):
        rate = self.exchange_rate()
        return _("  (No FX rate available)") if rate is None else "1 BTC~%s %s" % (self.value_str(COIN, rate), self.ccy)

    def get_historical_rates(self):
        if self.show_history():
            self.exchange.get_historical_rates(self.ccy)

    def requires_settings(self):
        return True

    def value_str(self, satoshis, rate):
        if satoshis is None:  # Can happen with incomplete history
            return _("Unknown")
        if rate:
            value = Decimal(satoshis) / COIN * Decimal(rate)
            return "%s" % (self.ccy_amount_str(value, True))
        return _("No data")

    @hook
    def historical_value_str(self, satoshis, d_t):
        rate = self.exchange.historical_rate(self.ccy, d_t)
        # Frequently there is no rate for today, until tomorrow :)
        # Use spot quotes in that case
        if rate is None and (datetime.today().date() - d_t.date()).days <= 2:
            rate = self.exchange.quotes.get(self.ccy)
            self.history_used_spot = True
        return self.value_str(satoshis, rate)

    @hook
    def history_tab_headers(self, headers):
        if self.show_history():
            headers.extend(['%s '%self.ccy + _('Amount'), '%s '%self.ccy + _('Balance')])

    @hook
    def history_tab_update_begin(self):
        self.history_used_spot = False

    @hook
    def history_tab_update(self, tx, entry):
        if not self.show_history():
            return
        tx_hash, conf, value, timestamp, balance = tx
        if conf <= 0:
            date = datetime.today()
        else:
            date = timestamp_to_datetime(timestamp)
        for amount in [value, balance]:
            text = self.historical_value_str(amount, date)
            entry.append(text)
