"""Tests for plot engine."""

import numpy as np
import pytest

from impakt.plot.engine import PlotEngine, DEFAULT_COLORS
from impakt.plot.spec import ChannelRef, Corridor, CorridorStyle, PlotSpec, PlotStyle


class TestPlotEngine:
    def test_render_empty(self):
        engine = PlotEngine()
        spec = PlotSpec()
        fig = engine.render(spec)
        assert fig is not None

    def test_render_with_channels(self, head_accel_x, head_accel_y):
        engine = PlotEngine()
        spec = PlotSpec(
            channels=[
                ChannelRef(channel=head_accel_x, style=PlotStyle(label="Head X")),
                ChannelRef(channel=head_accel_y, style=PlotStyle(label="Head Y")),
            ],
            y_label="g",
        )
        fig = engine.render(spec)
        assert len(fig.data) == 2

    def test_render_compact_mode(self, head_accel_x):
        engine = PlotEngine()
        spec = PlotSpec(
            channels=[ChannelRef(channel=head_accel_x)],
            compact=True,
        )
        fig = engine.render(spec)
        assert fig.layout.hovermode is False
        assert fig.layout.showlegend is False

    def test_render_with_corridors(self, head_accel_x):
        engine = PlotEngine()
        corridor = Corridor(
            name="Test Corridor",
            time=np.linspace(0, 0.1, 100),
            lower=np.full(100, -50.0),
            upper=np.full(100, 50.0),
        )
        spec = PlotSpec(
            channels=[ChannelRef(channel=head_accel_x)],
            corridors=[corridor],
        )
        fig = engine.render(spec)
        # 1 data trace + 2 corridor traces (upper + lower)
        assert len(fig.data) == 3

    def test_render_with_cursors(self, head_accel_x):
        engine = PlotEngine()
        spec = PlotSpec(
            channels=[ChannelRef(channel=head_accel_x)],
            x_cursors=(0.02, 0.06),
        )
        fig = engine.render(spec)
        # Should have vertical lines (as shapes)
        assert len(fig.layout.shapes) >= 2

    def test_compact_cursor_annotations(self, head_accel_x):
        engine = PlotEngine()
        spec = PlotSpec(
            channels=[ChannelRef(channel=head_accel_x)],
            x_cursors=(0.02, 0.06),
            compact=True,
        )
        fig = engine.render(spec)
        # Should have X1/X2 annotations
        annotations = [
            a for a in (fig.layout.annotations or []) if "X1" in str(a.text) or "X2" in str(a.text)
        ]
        assert len(annotations) == 2

    def test_default_colors(self):
        assert len(DEFAULT_COLORS) == 10
        assert all(c.startswith("#") for c in DEFAULT_COLORS)