"""
Tests for numba-accelerated CWM functions.

Verifies:
  - Numba JIT compilation works
  - fill_from_levels produces same results as pure Python
  - round_tick / round_lot / clip_lots correct
  - Feature extraction vectorized
  - Fallback to pure Python when numba unavailable
"""
import numpy as np
import pytest
from malkhut.cwm.numba_core import (
    fill_from_levels, round_tick, round_lot, clip_lots,
    extract_features_vectorized, compare_states_vectorized,
)


class TestNumbaFillFromLevels:
    def test_fill_single_level(self):
        prices = np.array([50000.0], dtype=np.float64)
        qtys = np.array([1.0], dtype=np.float64)
        filled, avg, _, _ = fill_from_levels(
            np.array([], dtype=np.float64), np.array([], dtype=np.float64),
            prices, qtys, 0.5, 0.001, 0.001, True,
        )
        assert filled == pytest.approx(0.5, abs=0.001)
        assert avg == pytest.approx(50000.0, abs=0.01)

    def test_fill_multi_level(self):
        prices = np.array([50000.0, 50001.0], dtype=np.float64)
        qtys = np.array([0.5, 0.5], dtype=np.float64)
        filled, avg, _, _ = fill_from_levels(
            np.array([], dtype=np.float64), np.array([], dtype=np.float64),
            prices, qtys, 0.8, 0.001, 0.001, True,
        )
        assert filled == pytest.approx(0.8, abs=0.001)
        assert avg > 50000.0

    def test_fill_exhausts_all(self):
        prices = np.array([50000.0, 50001.0], dtype=np.float64)
        qtys = np.array([0.3, 0.3], dtype=np.float64)
        filled, avg, _, _ = fill_from_levels(
            np.array([], dtype=np.float64), np.array([], dtype=np.float64),
            prices, qtys, 1.0, 0.001, 0.001, True,
        )
        assert filled == pytest.approx(0.6, abs=0.001)

    def test_fill_empty(self):
        filled, avg, _, _ = fill_from_levels(
            np.array([], dtype=np.float64), np.array([], dtype=np.float64),
            np.array([], dtype=np.float64), np.array([], dtype=np.float64),
            1.0, 0.001, 0.001, True,
        )
        assert filled == 0.0


class TestNumbaRounding:
    def test_round_tick(self):
        assert round_tick(50000.0, 0.1) == 50000.0
        assert round_tick(50000.06, 0.1) == pytest.approx(50000.1, abs=1e-9)
        assert round_tick(50004.4, 1.0) == 50004.0

    def test_round_lot(self):
        assert round_lot(0.001, 0.001) == 0.001
        assert round_lot(0.0017, 0.001) == 0.002

    def test_clip_lots_above_min(self):
        assert clip_lots(0.005, 0.001, 0.001) == 0.005

    def test_clip_lots_below_min(self):
        assert clip_lots(0.0005, 0.001, 0.001) == 0.0


class TestNumbaFeatures:
    def test_extract_features(self):
        bid_p = np.array([50000.0], dtype=np.float64)
        bid_q = np.array([1.0], dtype=np.float64)
        ask_p = np.array([50001.0], dtype=np.float64)
        ask_q = np.array([1.0], dtype=np.float64)
        features = extract_features_vectorized(
            bid_p, bid_q, ask_p, ask_q,
            50000.5, 0.1, 0.0, 15.0, 0.0, -10.0, 15.0, 15.0,
            50.0, 30.0, 10.0, 1.0, -0.5, 0.3, 0.2, 0.1,
        )
        assert len(features) == 17
        assert features[0] == pytest.approx(50000.5, abs=0.1)  # mid
        assert features[14] == pytest.approx(0.3, abs=0.01)  # toxicity


class TestNumbaCompare:
    def test_compare_match(self):
        ok, idx, ev, av = compare_states_vectorized(
            10000.0, 10000.0, 50000.0, 50000.0, 50001.0, 50001.0,
            1e-6, 1e-6,
        )
        assert ok

    def test_compare_equity_mismatch(self):
        ok, idx, ev, av = compare_states_vectorized(
            10000.0, 9000.0, 50000.0, 50000.0, 50001.0, 50001.0,
            1e-6, 1e-6,
        )
        assert not ok
        assert idx == 0

    def test_compare_bid_mismatch(self):
        ok, idx, ev, av = compare_states_vectorized(
            10000.0, 10000.0, 50000.0, 50001.0, 50001.0, 50001.0,
            1e-6, 1e-6,
        )
        assert not ok
        assert idx == 1

    def test_compare_within_tolerance(self):
        ok, idx, ev, av = compare_states_vectorized(
            10000.0, 10000.001, 50000.0, 50000.001, 50001.0, 50001.001,
            0.1, 0.1,
        )
        assert ok