from pathlib import Path
import sys


PROJECT_ROOT = Path(__file__).resolve().parents[1]
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))

from track_score_policy import initial_candidate_score, required_track_score, track_passes_score_gate


def test_required_track_score_is_stricter_for_switch_than_for_acquire():
    acquire_floor = required_track_score(
        confirmed=False,
        is_switch_candidate=False,
        weak_reacq_guard=False,
    )
    switch_floor = required_track_score(
        confirmed=True,
        is_switch_candidate=True,
        weak_reacq_guard=False,
    )

    assert switch_floor > acquire_floor


def test_weak_reacquire_uses_reacquire_floor():
    reacquire_floor = required_track_score(
        confirmed=True,
        is_switch_candidate=False,
        weak_reacq_guard=True,
    )

    assert track_passes_score_gate(
        track_score=reacquire_floor,
        confirmed=True,
        is_switch_candidate=False,
        weak_reacq_guard=True,
    )
    assert not track_passes_score_gate(
        track_score=reacquire_floor - 0.01,
        confirmed=True,
        is_switch_candidate=False,
        weak_reacq_guard=True,
    )


def test_switch_candidate_must_clear_switch_floor():
    switch_floor = required_track_score(
        confirmed=True,
        is_switch_candidate=True,
        weak_reacq_guard=False,
    )

    assert track_passes_score_gate(
        track_score=switch_floor,
        confirmed=True,
        is_switch_candidate=True,
        weak_reacq_guard=False,
    )
    assert not track_passes_score_gate(
        track_score=switch_floor - 0.01,
        confirmed=True,
        is_switch_candidate=True,
        weak_reacq_guard=False,
    )


def test_initial_selection_prefers_persistent_moving_target():
    distant_target = initial_candidate_score(
        track_score=0.06,
        track_hits=6,
        residual_motion=True,
    )
    one_frame_false_positive = initial_candidate_score(
        track_score=0.14,
        track_hits=1,
        residual_motion=False,
    )

    assert distant_target > one_frame_false_positive