import pytest

from app.core.trailing_stop import evaluate_trailing_stop, trailing_profile


def test_fixed_trailing_stop_activates_with_profit_floor():
    decision = evaluate_trailing_stop(
        position={"entry_price": 100, "max_price": 100, "min_price": 100, "trailing_stop": 0},
        current_price=104,
        pnl_pct=4,
        config={
            "trailing_stop_enabled": True,
            "trailing_mode": "fixed",
            "trailing_activate_pnl_pct": 3,
            "trailing_min_lock_profit_pct": 0.5,
            "trailing_distance_pct": 1.5,
        },
    ).as_dict()

    assert decision["action"] == "activate"
    assert decision["event_type"] == "trailing_activate"
    assert decision["activated"] is True
    assert decision["trailing_mode"] == "fixed"
    assert decision["trailing_stop"] == pytest.approx(102.44)


def test_trailing_stop_never_moves_down():
    decision = evaluate_trailing_stop(
        position={"entry_price": 100, "max_price": 106, "min_price": 100, "trailing_stop": 104},
        current_price=104.5,
        pnl_pct=4.5,
        config={
            "trailing_stop_enabled": True,
            "trailing_mode": "fixed",
            "trailing_activate_pnl_pct": 3,
            "trailing_min_lock_profit_pct": 0.5,
            "trailing_distance_pct": 1.5,
        },
    ).as_dict()

    assert decision["action"] == "hold"
    assert decision["reason"] == "unchanged"
    assert decision["trailing_stop"] == pytest.approx(104)


def test_short_trailing_stop_activates_and_moves_down():
    activated = evaluate_trailing_stop(
        position={"side": "short", "entry_price": 100, "max_price": 100, "min_price": 100, "trailing_stop": 0},
        current_price=94,
        pnl_pct=6,
        config={
            "trailing_stop_enabled": True,
            "trailing_mode": "fixed",
            "trailing_activate_pnl_pct": 3,
            "trailing_min_lock_profit_pct": 0.5,
            "trailing_distance_pct": 1.5,
        },
    ).as_dict()
    moved = evaluate_trailing_stop(
        position={"side": "short", "entry_price": 100, "max_price": 100, "min_price": 94, "trailing_stop": activated["trailing_stop"]},
        current_price=92,
        pnl_pct=8,
        config={
            "trailing_stop_enabled": True,
            "trailing_mode": "fixed",
            "trailing_activate_pnl_pct": 3,
            "trailing_min_lock_profit_pct": 0.5,
            "trailing_distance_pct": 1.5,
        },
    ).as_dict()

    assert activated["action"] == "activate"
    assert activated["trailing_stop"] == pytest.approx(95.41)
    assert moved["action"] == "move"
    assert moved["trailing_stop"] < activated["trailing_stop"]


def test_volatility_profile_widens_activation_and_distance():
    profile = trailing_profile(
        {"entry_price": 100, "max_price": 100, "min_price": 98},
        current_price=110,
        pnl_pct=10,
        config={
            "trailing_mode": "volatility",
            "trailing_activate_pnl_pct": 3,
            "trailing_distance_pct": 1.5,
            "trailing_volatility_activation_mult": 0.6,
            "trailing_volatility_distance_mult": 0.7,
            "trailing_volatility_max_activation_pct": 8,
            "trailing_volatility_max_distance_pct": 8,
        },
    )

    assert profile["trailing_mode"] == "volatility"
    assert profile["volatility_pct"] == pytest.approx(12)
    assert profile["activate_pnl_pct"] == pytest.approx(7.2)
    assert profile["distance_pct"] == pytest.approx(8.0)