import os
import sys
from unittest.mock import MagicMock

import pytest

sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', 'src'))

from backtest_strategy_instance import BacktestStrategyInstance


class TestBacktestStrategyInstanceConvertAsset:
    """Tests for backtest-specific asset conversion behavior."""

    def test_convert_asset_uses_active_feed_for_matching_pair(self):
        """Backtest conversions should work for the active feed symbol."""
        instance = BacktestStrategyInstance.__new__(BacktestStrategyInstance)
        instance.exec_context = {'current_symbol': 'BTC/USDT'}
        instance.get_current_price = MagicMock(return_value=50000.0)

        result = BacktestStrategyInstance.convert_asset(instance, 10, 'USD', 'BTC')

        assert result == pytest.approx(0.0002, rel=1e-6)

    def test_convert_asset_returns_zero_for_unavailable_backtest_pair(self):
        """Backtest should not reuse the current feed price for unrelated symbols."""
        instance = BacktestStrategyInstance.__new__(BacktestStrategyInstance)
        instance.exec_context = {'current_symbol': 'BTC/USDT'}
        instance.get_current_price = MagicMock(return_value=50000.0)

        result = BacktestStrategyInstance.convert_asset(instance, 10, 'USD', 'ETH')

        assert result == 0.0