from lbrynet.core.Strategy import get_default_strategy, OnlyFreeStrategy
from lbrynet import conf
from decimal import Decimal


class BasePaymentRateManager(object):
    def __init__(self, rate=None, info_rate=None):
        self.min_blob_data_payment_rate = rate if rate is not None else conf.settings['data_rate']
        self.min_blob_info_payment_rate = (
            info_rate if info_rate is not None else conf.settings['min_info_rate'])


class PaymentRateManager(object):
    def __init__(self, base, rate=None):
        """
        @param base: a BasePaymentRateManager

        @param rate: the min blob data payment rate
        """
        self.base = base
        self.min_blob_data_payment_rate = rate
        self.points_paid = 0.0

    def get_rate_blob_data(self, peer):
        return self.get_effective_min_blob_data_payment_rate()

    def accept_rate_blob_data(self, peer, payment_rate):
        return payment_rate >= self.get_effective_min_blob_data_payment_rate()

    def get_effective_min_blob_data_payment_rate(self):
        if self.min_blob_data_payment_rate is None:
            return self.base.min_blob_data_payment_rate
        return self.min_blob_data_payment_rate

    def record_points_paid(self, amount):
        self.points_paid += amount


class NegotiatedPaymentRateManager(object):
    def __init__(self, base, availability_tracker, generous=None):
        """
        @param base: a BasePaymentRateManager
        @param availability_tracker: a BlobAvailabilityTracker
        @param rate: the min blob data payment rate
        """

        self.base = base
        self.min_blob_data_payment_rate = base.min_blob_data_payment_rate
        self.points_paid = 0.0
        self.blob_tracker = availability_tracker
        self.generous = generous if generous is not None else conf.settings['is_generous_host']
        self.strategy = get_default_strategy(self.blob_tracker,
                                             base_price=self.base.min_blob_data_payment_rate,
                                             is_generous=generous)

    def get_rate_blob_data(self, peer, blobs):
        response = self.strategy.make_offer(peer, blobs)
        return response.rate

    def accept_rate_blob_data(self, peer, blobs, offer):
        offer = self.strategy.respond_to_offer(offer, peer, blobs)
        self.strategy.update_accepted_offers(peer, offer)
        return offer.is_accepted

    def reply_to_offer(self, peer, blobs, offer):
        reply = self.strategy.respond_to_offer(offer, peer, blobs)
        self.strategy.update_accepted_offers(peer, reply)
        return reply

    def get_rate_for_peer(self, peer):
        return self.strategy.accepted_offers.get(peer, False)

    def record_points_paid(self, amount):
        self.points_paid += amount

    def record_offer_reply(self, peer, offer):
        self.strategy.update_accepted_offers(peer, offer)

    def price_limit_reached(self, peer):
        if peer in self.strategy.pending_sent_offers:
            offer = self.strategy.pending_sent_offers[peer]
            return (offer.is_too_low and
                    round(Decimal.from_float(offer.rate), 5) >= round(self.strategy.max_rate, 5))
        return False


class OnlyFreePaymentsManager(object):
    def __init__(self, **kwargs):
        """
        A payment rate manager that will only ever accept and offer a rate of 0.0,
        Used for testing
        """

        self.base = BasePaymentRateManager(0.0, 0.0)
        self.points_paid = 0.0
        self.min_blob_data_payment_rate = 0.0
        self.generous = True
        self.strategy = OnlyFreeStrategy()

    def get_rate_blob_data(self, peer, blobs):
        response = self.strategy.make_offer(peer, blobs)
        return response.rate

    def accept_rate_blob_data(self, peer, blobs, offer):
        offer = self.strategy.respond_to_offer(offer, peer, blobs)
        self.strategy.update_accepted_offers(peer, offer)
        return offer.is_accepted

    def reply_to_offer(self, peer, blobs, offer):
        reply = self.strategy.respond_to_offer(offer, peer, blobs)
        self.strategy.update_accepted_offers(peer, reply)
        return reply

    def get_rate_for_peer(self, peer):
        return self.strategy.accepted_offers.get(peer, False)

    def record_points_paid(self, amount):
        self.points_paid += amount

    def record_offer_reply(self, peer, offer):
        self.strategy.update_accepted_offers(peer, offer)

    def price_limit_reached(self, peer):
        if peer in self.strategy.pending_sent_offers:
            offer = self.strategy.pending_sent_offers[peer]
            if offer.rate > 0.0:
                return True
        return False