"""
Tests for engine.display.backends.websocket module.
"""

from unittest.mock import MagicMock, patch

import pytest

from engine.display.backends.websocket import WebSocketDisplay


class TestWebSocketDisplayImport:
    """Test that websocket module can be imported."""

    def test_import_does_not_error(self):
        """Module imports without error."""
        from engine.display import backends

        assert backends is not None


class TestWebSocketDisplayInit:
    """Tests for WebSocketDisplay initialization."""

    def test_default_init(self):
        """Default initialization sets correct defaults."""
        with patch("engine.display.backends.websocket.websockets", None):
            display = WebSocketDisplay()
            assert display.host == "0.0.0.0"
            assert display.port == 8765
            assert display.http_port == 8766
            assert display.width == 80
            assert display.height == 24

    def test_custom_init(self):
        """Custom initialization uses provided values."""
        with patch("engine.display.backends.websocket.websockets", None):
            display = WebSocketDisplay(host="localhost", port=9000, http_port=9001)
            assert display.host == "localhost"
            assert display.port == 9000
            assert display.http_port == 9001

    def test_is_available_when_websockets_present(self):
        """is_available returns True when websockets is available."""
        pytest.importorskip("websockets")
        display = WebSocketDisplay()
        assert display.is_available() is True

    @pytest.mark.skipif(
        pytest.importorskip("websockets") is not None, reason="websockets is available"
    )
    def test_is_available_when_websockets_missing(self):
        """is_available returns False when websockets is not available."""
        display = WebSocketDisplay()
        assert display.is_available() is False


class TestWebSocketDisplayProtocol:
    """Test that WebSocketDisplay satisfies Display protocol."""

    def test_websocket_display_is_display(self):
        """WebSocketDisplay satisfies Display protocol."""
        with patch("engine.display.backends.websocket.websockets", MagicMock()):
            display = WebSocketDisplay()
            assert hasattr(display, "init")
            assert hasattr(display, "show")
            assert hasattr(display, "clear")
            assert hasattr(display, "cleanup")


class TestWebSocketDisplayMethods:
    """Tests for WebSocketDisplay methods."""

    def test_init_stores_dimensions(self):
        """init stores terminal dimensions."""
        with patch("engine.display.backends.websocket.websockets", MagicMock()):
            display = WebSocketDisplay()
            display.init(100, 40)
            assert display.width == 100
            assert display.height == 40

    @pytest.mark.skip(reason="port binding conflict in CI environment")
    def test_client_count_initially_zero(self):
        """client_count returns 0 when no clients connected."""
        with patch("engine.display.backends.websocket.websockets", MagicMock()):
            display = WebSocketDisplay()
            assert display.client_count() == 0

    def test_get_ws_port(self):
        """get_ws_port returns configured port."""
        with patch("engine.display.backends.websocket.websockets", MagicMock()):
            display = WebSocketDisplay(port=9000)
            assert display.get_ws_port() == 9000

    def test_get_http_port(self):
        """get_http_port returns configured port."""
        with patch("engine.display.backends.websocket.websockets", MagicMock()):
            display = WebSocketDisplay(http_port=9001)
            assert display.get_http_port() == 9001

    def test_frame_delay_defaults_to_zero(self):
        """get_frame_delay returns 0 by default."""
        with patch("engine.display.backends.websocket.websockets", MagicMock()):
            display = WebSocketDisplay()
            assert display.get_frame_delay() == 0.0

    def test_set_frame_delay(self):
        """set_frame_delay stores the value."""
        with patch("engine.display.backends.websocket.websockets", MagicMock()):
            display = WebSocketDisplay()
            display.set_frame_delay(0.05)
            assert display.get_frame_delay() == 0.05


class TestWebSocketDisplayCallbacks:
    """Tests for WebSocketDisplay callback methods."""

    def test_set_client_connected_callback(self):
        """set_client_connected_callback stores callback."""
        with patch("engine.display.backends.websocket.websockets", MagicMock()):
            display = WebSocketDisplay()
            callback = MagicMock()
            display.set_client_connected_callback(callback)
            assert display._client_connected_callback is callback

    def test_set_client_disconnected_callback(self):
        """set_client_disconnected_callback stores callback."""
        with patch("engine.display.backends.websocket.websockets", MagicMock()):
            display = WebSocketDisplay()
            callback = MagicMock()
            display.set_client_disconnected_callback(callback)
            assert display._client_disconnected_callback is callback


class TestWebSocketDisplayUnavailable:
    """Tests when WebSocket support is unavailable."""

    @pytest.mark.skipif(
        pytest.importorskip("websockets") is not None, reason="websockets is available"
    )
    def test_start_server_noop_when_unavailable(self):
        """start_server does nothing when websockets unavailable."""
        display = WebSocketDisplay()
        display.start_server()
        assert display._server_thread is None

    @pytest.mark.skipif(
        pytest.importorskip("websockets") is not None, reason="websockets is available"
    )
    def test_start_http_server_noop_when_unavailable(self):
        """start_http_server does nothing when websockets unavailable."""
        display = WebSocketDisplay()
        display.start_http_server()
        assert display._http_thread is None

    @pytest.mark.skipif(
        pytest.importorskip("websockets") is not None, reason="websockets is available"
    )
    def test_show_noops_when_unavailable(self):
        """show does nothing when websockets unavailable."""
        display = WebSocketDisplay()
        display.show(["line1", "line2"])