"""
Tests for PipelineIntrospectionDemo.
"""

from engine.pipeline.pipeline_introspection_demo import (
    DemoConfig,
    DemoPhase,
    PhaseState,
    PipelineIntrospectionDemo,
)


class MockPipeline:
    """Mock pipeline for testing."""

    pass


class MockEffectConfig:
    """Mock effect config."""

    def __init__(self):
        self.enabled = False
        self.intensity = 0.5


class MockEffect:
    """Mock effect for testing."""

    def __init__(self, name):
        self.name = name
        self.config = MockEffectConfig()


class MockRegistry:
    """Mock effect registry."""

    def __init__(self, effects):
        self._effects = {e.name: e for e in effects}

    def get(self, name):
        return self._effects.get(name)


class TestDemoPhase:
    """Tests for DemoPhase enum."""

    def test_phases_exist(self):
        """All three phases exist."""
        assert DemoPhase.PHASE_1_TOGGLE is not None
        assert DemoPhase.PHASE_2_LFO is not None
        assert DemoPhase.PHASE_3_SHARED_LFO is not None


class TestDemoConfig:
    """Tests for DemoConfig."""

    def test_defaults(self):
        """Default config has sensible values."""
        config = DemoConfig()
        assert config.effect_cycle_duration == 3.0
        assert config.gap_duration == 1.0
        assert config.lfo_duration == 4.0
        assert config.phase_2_effect_duration == 4.0
        assert config.phase_3_lfo_duration == 6.0


class TestPhaseState:
    """Tests for PhaseState."""

    def test_defaults(self):
        """PhaseState initializes correctly."""
        state = PhaseState(phase=DemoPhase.PHASE_1_TOGGLE, start_time=0.0)
        assert state.phase == DemoPhase.PHASE_1_TOGGLE
        assert state.start_time == 0.0
        assert state.current_effect_index == 0


class TestPipelineIntrospectionDemo:
    """Tests for PipelineIntrospectionDemo."""

    def test_basic_init(self):
        """Demo initializes with defaults."""
        demo = PipelineIntrospectionDemo(pipeline=None)
        assert demo.phase == DemoPhase.PHASE_1_TOGGLE
        assert demo.effect_names == ["noise", "fade", "glitch", "firehose"]

    def test_init_with_custom_effects(self):
        """Demo initializes with custom effects."""
        demo = PipelineIntrospectionDemo(pipeline=None, effect_names=["noise", "fade"])
        assert demo.effect_names == ["noise", "fade"]

    def test_phase_display(self):
        """phase_display returns correct string."""
        demo = PipelineIntrospectionDemo(pipeline=None)
        assert "Phase 1" in demo.phase_display

    def test_shared_oscillator_created(self):
        """Shared oscillator is created."""
        demo = PipelineIntrospectionDemo(pipeline=None)
        assert demo.shared_oscillator is not None
        assert demo.shared_oscillator.name == "demo-lfo"


class TestPipelineIntrospectionDemoUpdate:
    """Tests for update method."""

    def test_update_returns_dict(self):
        """update() returns a dict with expected keys."""
        demo = PipelineIntrospectionDemo(pipeline=None)
        result = demo.update()
        assert "phase" in result
        assert "phase_display" in result
        assert "effect_states" in result

    def test_update_phase_1_structure(self):
        """Phase 1 has correct structure."""
        demo = PipelineIntrospectionDemo(pipeline=None)
        result = demo.update()
        assert result["phase"] == "PHASE_1_TOGGLE"
        assert "current_effect" in result

    def test_effect_states_structure(self):
        """effect_states has correct structure."""
        demo = PipelineIntrospectionDemo(pipeline=None)
        result = demo.update()
        states = result["effect_states"]
        for name in demo.effect_names:
            assert name in states
            assert "enabled" in states[name]
            assert "intensity" in states[name]


class TestPipelineIntrospectionDemoPhases:
    """Tests for phase transitions."""

    def test_phase_1_initial(self):
        """Starts in phase 1."""
        demo = PipelineIntrospectionDemo(pipeline=None)
        assert demo.phase == DemoPhase.PHASE_1_TOGGLE

    def test_shared_oscillator_not_started_initially(self):
        """Shared oscillator not started in phase 1."""
        demo = PipelineIntrospectionDemo(pipeline=None)
        assert demo.shared_oscillator is not None
        # The oscillator.start() is called when transitioning to phase 3


class TestPipelineIntrospectionDemoCleanup:
    """Tests for cleanup method."""

    def test_cleanup_no_error(self):
        """cleanup() runs without error."""
        demo = PipelineIntrospectionDemo(pipeline=None)
        demo.cleanup()  # Should not raise

    def test_cleanup_resets_effects(self):
        """cleanup() resets effects."""
        demo = PipelineIntrospectionDemo(pipeline=None)
        demo._apply_effect_states(
            {
                "noise": {"enabled": True, "intensity": 1.0},
                "fade": {"enabled": True, "intensity": 1.0},
            }
        )
        demo.cleanup()
        # If we had a mock registry, we could verify effects were reset