"""Tests for time-windowed MetricHistory (force plot buffer)."""

from __future__ import annotations

import pytest
import numpy as np
import warnings
from orisys_app_shared.force.history import MetricHistory


def test_unavailable_channels_keep_gaps_without_empty_slice_warnings():
    history = MetricHistory()
    history.push(1, np.nan, np.nan, np.nan)
    with warnings.catch_warnings():
        warnings.simplefilter("error", RuntimeWarning)
        state = history.state()
    assert np.isnan(state.values).all()
    assert all(np.isfinite(bounds).all() and bounds[0] < bounds[1]
               for bounds in state.y_ranges)


def _push_at_rate(hist: MetricHistory, *, fps: float, duration_sec: float, t0: float = 1000.0) -> None:
    dt = 1.0 / fps
    n = int(round(duration_sec * fps)) + 1
    for i in range(n):
        hist.push(t0 + i * dt, 1.0, 0.0, -1.0)


def test_fill_phase_x_range_is_fixed_window():
    hist = MetricHistory(window_sec=4.0, sample_rate_hz=30.0, lowpass_cutoff_hz=0.0, max_fps=90.0)
    _push_at_rate(hist, fps=30.0, duration_sec=2.0)
    state = hist.state()
    assert state is not None
    assert state.x_range == pytest.approx((0.0, 4.0))
    assert float(state.times[-1]) < 4.0


def test_high_fps_after_scroll_covers_x_range():
    window = 4.0
    hist = MetricHistory(window_sec=window, sample_rate_hz=30.0, lowpass_cutoff_hz=0.0, max_fps=90.0)
    _push_at_rate(hist, fps=60.0, duration_sec=window + 1.0)
    state = hist.state()
    assert state is not None
    x0, x1 = state.x_range
    assert x1 - x0 == pytest.approx(window)
    assert float(state.times[0]) == pytest.approx(x0)
    assert float(state.times[-1]) == pytest.approx(x1)


def test_nominal_30hz_after_scroll_covers_x_range():
    window = 4.0
    hist = MetricHistory(window_sec=window, sample_rate_hz=30.0, lowpass_cutoff_hz=0.0, max_fps=90.0)
    _push_at_rate(hist, fps=30.0, duration_sec=window + 2.0)
    state = hist.state()
    assert state is not None
    x0, x1 = state.x_range
    assert x1 - x0 == pytest.approx(window)
    assert float(state.times[0]) == pytest.approx(x0)


def test_set_window_sec_prunes_older_samples():
    hist = MetricHistory(window_sec=4.0, sample_rate_hz=30.0, lowpass_cutoff_hz=0.0, max_fps=90.0)
    _push_at_rate(hist, fps=30.0, duration_sec=5.0)
    before = hist.state()
    assert before is not None
    assert float(before.times[-1]) >= 4.0

    hist.set_window_sec(1.0)
    after = hist.state()
    assert after is not None
    assert after.x_range[1] - after.x_range[0] == pytest.approx(1.0)
    assert float(after.times[0]) == pytest.approx(after.x_range[0])
    # All retained samples must lie within the new window ending at t_end.
    t_end = float(after.times[-1])
    assert float(after.times[0]) >= t_end - 1.0 - 1e-9