"""Tests for render_figment_overlay in engine.layers."""

from effects_plugins.figment import FigmentPhase, FigmentState
from engine.layers import render_figment_overlay


def _make_state(phase=FigmentPhase.HOLD, progress=0.5):
    return FigmentState(
        phase=phase,
        progress=progress,
        rows=["█▀▄ █", " ▄█▀ ", "█   █"],
        gradient=[46, 40, 34, 28, 22, 22, 34, 40, 46, 82, 118, 231],
        center_row=10,
        center_col=37,
    )


class TestRenderFigmentOverlay:
    def test_returns_list_of_strings(self):
        state = _make_state()
        result = render_figment_overlay(state, 80, 24)
        assert isinstance(result, list)
        assert all(isinstance(s, str) for s in result)

    def test_contains_ansi_positioning(self):
        state = _make_state()
        result = render_figment_overlay(state, 80, 24)
        # Should contain cursor positioning escape codes
        assert any("\033[" in s for s in result)

    def test_reveal_phase_partial(self):
        state = _make_state(phase=FigmentPhase.REVEAL, progress=0.0)
        result = render_figment_overlay(state, 80, 24)
        # At progress 0.0, very few cells should be visible
        # Result should still be a valid list
        assert isinstance(result, list)

    def test_hold_phase_full(self):
        state = _make_state(phase=FigmentPhase.HOLD, progress=0.5)
        result = render_figment_overlay(state, 80, 24)
        # During hold, content should be present
        assert len(result) > 0

    def test_dissolve_phase(self):
        state = _make_state(phase=FigmentPhase.DISSOLVE, progress=0.9)
        result = render_figment_overlay(state, 80, 24)
        # At high dissolve progress, most cells are gone
        assert isinstance(result, list)

    def test_empty_rows(self):
        state = FigmentState(
            phase=FigmentPhase.HOLD,
            progress=0.5,
            rows=[],
            gradient=[46] * 12,
            center_row=0,
            center_col=0,
        )
        result = render_figment_overlay(state, 80, 24)
        assert result == []