"""Tests for Combined strategy."""
import sys
from pathlib import Path
sys.path.insert(0, str(Path(__file__).resolve().parents[1]))

from decimal import Decimal
from datetime import datetime, timezone
import pytest

from shared.models import Candle, Signal, OrderSide
from strategies.combined_strategy import CombinedStrategy
from strategies.base import BaseStrategy


class AlwaysBuyStrategy(BaseStrategy):
    name = "always_buy"

    @property
    def warmup_period(self) -> int:
        return 0

    def configure(self, params: dict) -> None:
        pass

    def on_candle(self, candle: Candle) -> Signal | None:
        return Signal(
            strategy=self.name, symbol=candle.symbol,
            side=OrderSide.BUY, price=candle.close,
            quantity=Decimal("0.01"), reason="always buy",
        )


class AlwaysSellStrategy(BaseStrategy):
    name = "always_sell"

    @property
    def warmup_period(self) -> int:
        return 0

    def configure(self, params: dict) -> None:
        pass

    def on_candle(self, candle: Candle) -> Signal | None:
        return Signal(
            strategy=self.name, symbol=candle.symbol,
            side=OrderSide.SELL, price=candle.close,
            quantity=Decimal("0.01"), reason="always sell",
        )


class NeutralStrategy(BaseStrategy):
    name = "neutral"

    @property
    def warmup_period(self) -> int:
        return 0

    def configure(self, params: dict) -> None:
        pass

    def on_candle(self, candle: Candle) -> Signal | None:
        return None


def _candle(price=100.0):
    return Candle(
        symbol="BTCUSDT", timeframe="1m",
        open_time=datetime(2025, 1, 1, tzinfo=timezone.utc),
        open=Decimal(str(price)), high=Decimal(str(price+10)),
        low=Decimal(str(price-10)), close=Decimal(str(price)),
        volume=Decimal("10"),
    )


def test_combined_no_strategies():
    c = CombinedStrategy()
    c.configure({"threshold": 0.5})
    assert c.on_candle(_candle()) is None


def test_combined_unanimous_buy():
    c = CombinedStrategy()
    c.configure({"threshold": 0.5})
    c.add_strategy(AlwaysBuyStrategy(), weight=1.0)
    c.add_strategy(AlwaysBuyStrategy(), weight=1.0)
    sig = c.on_candle(_candle())
    assert sig is not None
    assert sig.side == OrderSide.BUY


def test_combined_unanimous_sell():
    c = CombinedStrategy()
    c.configure({"threshold": 0.5})
    c.add_strategy(AlwaysSellStrategy(), weight=1.0)
    c.add_strategy(AlwaysSellStrategy(), weight=1.0)
    sig = c.on_candle(_candle())
    assert sig is not None
    assert sig.side == OrderSide.SELL


def test_combined_conflicting_signals_cancel():
    c = CombinedStrategy()
    c.configure({"threshold": 0.5})
    c.add_strategy(AlwaysBuyStrategy(), weight=1.0)
    c.add_strategy(AlwaysSellStrategy(), weight=1.0)
    sig = c.on_candle(_candle())
    assert sig is None  # Score = 0, below threshold


def test_combined_weighted_buy():
    c = CombinedStrategy()
    c.configure({"threshold": 0.3})
    c.add_strategy(AlwaysBuyStrategy(), weight=3.0)
    c.add_strategy(AlwaysSellStrategy(), weight=1.0)
    sig = c.on_candle(_candle())
    assert sig is not None
    assert sig.side == OrderSide.BUY  # Score = (3-1)/4 = 0.5 >= 0.3


def test_combined_neutral_doesnt_affect_score():
    c = CombinedStrategy()
    c.configure({"threshold": 0.5})
    c.add_strategy(AlwaysBuyStrategy(), weight=1.0)
    c.add_strategy(NeutralStrategy(), weight=1.0)
    sig = c.on_candle(_candle())
    assert sig is not None
    assert sig.side == OrderSide.BUY  # Score = 1/2 = 0.5 >= 0.5


def test_combined_warmup_is_max():
    c = CombinedStrategy()
    c.configure({})
    s1 = AlwaysBuyStrategy()
    s2 = NeutralStrategy()
    c.add_strategy(s1)
    c.add_strategy(s2)
    assert c.warmup_period == 0


def test_combined_reset_resets_all():
    c = CombinedStrategy()
    c.configure({})
    c.add_strategy(AlwaysBuyStrategy())
    c.on_candle(_candle())
    c.reset()  # Should not crash


def test_combined_invalid_threshold():
    c = CombinedStrategy()
    with pytest.raises(ValueError):
        c.configure({"threshold": -1})


def test_combined_invalid_weight():
    c = CombinedStrategy()
    c.configure({})
    with pytest.raises(ValueError):
        c.add_strategy(AlwaysBuyStrategy(), weight=-1.0)