import unittest

from trade_exchange_stats_lib import (
    aggregate_bilateral_stats,
    commission_usdt_from_fill,
    filter_position_lifecycle_fills,
    merge_commission_prefer_income,
    quote_turnover_usdt_from_fill,
)


class TradeExchangeStatsTests(unittest.TestCase):
    def test_turnover_from_cost(self):
        t = {"cost": 1000.0, "price": 50, "amount": 20}
        self.assertEqual(quote_turnover_usdt_from_fill(t), 1000.0)

    def test_commission_from_fee(self):
        t = {"fee": {"cost": -0.42, "currency": "USDT"}}
        self.assertEqual(commission_usdt_from_fill(t), 0.42)

    def test_bilateral_aggregate(self):
        fills = [
            {"side": "buy", "cost": 500, "fee": {"cost": -0.2, "currency": "USDT"}, "timestamp": 1000},
            {"side": "sell", "cost": 520, "fee": {"cost": -0.21, "currency": "USDT"}, "timestamp": 2000},
        ]
        stats = aggregate_bilateral_stats(fills)
        self.assertIsNotNone(stats)
        self.assertEqual(stats["exchange_turnover_usdt"], 1020.0)
        self.assertEqual(stats["exchange_commission_usdt"], 0.41)

    def test_filter_long_lifecycle(self):
        base = 1_700_000_000_000
        trades = [
            {"side": "buy", "timestamp": base, "cost": 100},
            {"side": "sell", "timestamp": base + 60_000, "cost": 110},
            {"side": "buy", "timestamp": base + 120_000, "cost": 999},
        ]
        got = filter_position_lifecycle_fills(
            trades, "long", base - 1000, base + 90_000, close_buffer_ms=0
        )
        self.assertEqual(len(got), 2)

    def test_prefer_income_commission(self):
        self.assertEqual(merge_commission_prefer_income(0.3, 0.45), 0.45)


if __name__ == "__main__":
    unittest.main()