from typing import List

from bfxapi import Position

from bfxbot.models import Strategy, PositionState, SymbolStatus, Event, EventKind
from bfxbot.utils import TAKER_FEE, net_pl_percentage


class TrailingStopStrategy(Strategy):
    BREAK_EVEN_PERC = TAKER_FEE
    MIN_PROFIT_PERC = TAKER_FEE * 2.5
    GOOD_PROFIT_PERC = MIN_PROFIT_PERC * 1.5
    MAX_LOSS_PERC = -3.75
    OFFER_PERC = 0.01

    TRAIL_STOP_PERCENTAGES = {
        PositionState.MINIMUM_PROFIT: 0.27,
        PositionState.PROFIT: 0.14
    }

    def position_on_tick(self, position: Position, ss: SymbolStatus) -> (PositionState, List[Event]):
        events = []

        pl_perc = net_pl_percentage(position.profit_loss_percentage, TAKER_FEE)
        prev = ss.previous_position_w(position.id)

        if pl_perc > self.GOOD_PROFIT_PERC:
            state = PositionState.PROFIT
        elif self.MIN_PROFIT_PERC <= pl_perc < self.GOOD_PROFIT_PERC:
            state = PositionState.MINIMUM_PROFIT
        elif 0.0 <= pl_perc < self.MIN_PROFIT_PERC:
            state = PositionState.BREAK_EVEN
        elif self.MAX_LOSS_PERC < pl_perc < 0.0:
            state = PositionState.LOSS
        else:
            state = PositionState.CRITICAL

        if not prev or prev.state == state:
            return state, events

        if state ==PositionState.PROFIT:
            events.append(Event(EventKind.REACHED_GOOD_PROFIT, position.id, ss.current_tick))
        elif state == PositionState.MINIMUM_PROFIT:
            events.append(Event(EventKind.REACHED_MIN_PROFIT, position.id, ss.current_tick))
        elif state == PositionState.BREAK_EVEN:
            events.append(Event(EventKind.REACHED_BREAK_EVEN, position.id, ss.current_tick))
        elif state== PositionState.LOSS:
            events.append(Event(EventKind.REACHED_LOSS, position.id, ss.current_tick))
        else:
            events.append(Event(EventKind.REACHED_MAX_LOSS, position.id, ss.current_tick))
            events.append(Event(EventKind.CLOSE_POSITION, position.id, ss.current_tick))

        return state, events