"""Comprehensive tests for GraphViewWidget.

Tests cover:
- Widget initialization
- Display functionality
- Static content handling
- Styling
- Edge cases
"""

import pytest

try:
    from textual.widgets import Static

    TEXTUAL_AVAILABLE = True
except ImportError:
    TEXTUAL_AVAILABLE = False
    Static = None

from tracertm.tui.widgets.graph_view import TEXTUAL_AVAILABLE as WIDGET_TEXTUAL
from tracertm.tui.widgets.graph_view import GraphViewWidget


@pytest.mark.skipif(not TEXTUAL_AVAILABLE, reason="Textual not installed")
class TestGraphViewWidget:
    """Test GraphViewWidget initialization and basic functionality."""

    def test_widget_initialization(self) -> None:
        """Test widget can be initialized."""
        widget = GraphViewWidget()
        assert widget is not None
        assert isinstance(widget, Static)

    def test_widget_inherits_static(self) -> None:
        """Test widget inherits from Static."""
        widget = GraphViewWidget()
        assert isinstance(widget, Static)

    def test_widget_has_content(self) -> None:
        """Test widget has initial content."""
        widget = GraphViewWidget()
        # Default content should be "Graph View"
        if hasattr(widget, "renderable"):
            # Content may be stored in various attributes
            assert widget is not None

    def test_widget_with_id(self) -> None:
        """Test widget can be created with custom id."""
        widget = GraphViewWidget(id="test-graph")
        assert widget.id == "test-graph"

    def test_widget_with_classes(self) -> None:
        """Test widget can be created with CSS classes."""
        widget = GraphViewWidget(classes="custom-class")
        assert "custom-class" in widget.classes

    def test_multiple_widgets(self) -> None:
        """Test multiple widgets can coexist."""
        widget1 = GraphViewWidget(id="graph1")
        widget2 = GraphViewWidget(id="graph2")
        assert widget1.id != widget2.id
        assert widget1 is not widget2


@pytest.mark.skipif(not TEXTUAL_AVAILABLE, reason="Textual not installed")
class TestGraphViewWidgetContent:
    """Test content management."""

    def test_default_content(self) -> None:
        """Test default content is set."""
        widget = GraphViewWidget()
        # Widget should be initialized with "Graph View"
        assert widget is not None

    def test_update_content(self) -> None:
        """Test updating widget content."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            widget.update("New graph content")
            # Content should be updated
            assert widget is not None

    def test_empty_content(self) -> None:
        """Test widget with empty content."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            widget.update("")
            assert widget is not None

    def test_multiline_content(self) -> None:
        """Test widget with multiline content."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            content = "Line 1\nLine 2\nLine 3"
            widget.update(content)
            assert widget is not None

    def test_large_content(self) -> None:
        """Test widget with large content."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            content = "\n".join([f"Node {i}" for i in range(100)])
            widget.update(content)
            assert widget is not None


@pytest.mark.skipif(not TEXTUAL_AVAILABLE, reason="Textual not installed")
class TestGraphViewWidgetDisplay:
    """Test display functionality."""

    def test_graph_visualization_placeholder(self) -> None:
        """Test widget serves as graph visualization placeholder."""
        widget = GraphViewWidget()
        # Widget should be a Static widget ready for graph content
        assert isinstance(widget, Static)

    def test_ascii_graph_content(self) -> None:
        """Test widget can display ASCII graph."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            ascii_graph = """
            A
            |
            B -- C
            |    |
            D    E
            """
            widget.update(ascii_graph)
            assert widget is not None

    def test_node_list_content(self) -> None:
        """Test widget can display node list."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            node_list = "Nodes:\n- Node A\n- Node B\n- Node C"
            widget.update(node_list)
            assert widget is not None

    def test_edge_list_content(self) -> None:
        """Test widget can display edge list."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            edge_list = "Edges:\nA -> B\nB -> C\nC -> D"
            widget.update(edge_list)
            assert widget is not None


@pytest.mark.skipif(not TEXTUAL_AVAILABLE, reason="Textual not installed")
class TestGraphViewWidgetStyling:
    """Test widget styling capabilities."""

    def test_custom_styles(self) -> None:
        """Test widget accepts custom styles."""
        widget = GraphViewWidget(classes="custom-style")
        assert "custom-style" in widget.classes

    def test_multiple_classes(self) -> None:
        """Test widget can have multiple CSS classes."""
        widget = GraphViewWidget(classes="class1 class2 class3")
        assert any(c in widget.classes for c in ["class1", "class2", "class3"])

    def test_id_attribute(self) -> None:
        """Test widget ID attribute."""
        widget = GraphViewWidget(id="unique-graph")
        assert widget.id == "unique-graph"

    def test_expand_attribute(self) -> None:
        """Test widget expand attribute."""
        widget = GraphViewWidget(expand=True)
        if hasattr(widget, "expand"):
            assert widget.expand is True


@pytest.mark.skipif(not TEXTUAL_AVAILABLE, reason="Textual not installed")
class TestGraphViewWidgetEdgeCases:
    """Test edge cases and error handling."""

    def test_none_content(self) -> None:
        """Test widget with None content."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            try:
                widget.update(None)
                assert widget is not None
            except (TypeError, ValueError):
                # Expected exception for None
                pass

    def test_special_characters(self) -> None:
        """Test widget with special characters."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            content = 'Graph <test> & "quotes"'
            widget.update(content)
            assert widget is not None

    def test_unicode_content(self) -> None:
        """Test widget with unicode characters."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            content = "Graph 测试 🎯 ➜"
            widget.update(content)
            assert widget is not None

    def test_very_long_line(self) -> None:
        """Test widget with very long single line."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            content = "Node " * 1000
            widget.update(content)
            assert widget is not None

    def test_many_lines(self) -> None:
        """Test widget with many lines."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            content = "\n".join([f"Line {i}" for i in range(1000)])
            widget.update(content)
            assert widget is not None


@pytest.mark.skipif(not TEXTUAL_AVAILABLE, reason="Textual not installed")
class TestGraphViewWidgetIntegration:
    """Test widget integration scenarios."""

    def test_update_multiple_times(self) -> None:
        """Test updating content multiple times."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            widget.update("First content")
            widget.update("Second content")
            widget.update("Third content")
            assert widget is not None

    def test_clear_content(self) -> None:
        """Test clearing content."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            widget.update("Some graph content")
            widget.update("")
            assert widget is not None

    def test_graph_state_changes(self) -> None:
        """Test representing different graph states."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            # Empty graph
            widget.update("Empty graph")

            # Single node
            widget.update("Node: A")

            # Multiple nodes
            widget.update("Nodes: A, B, C")

            # Full graph
            widget.update("A -> B -> C")

            assert widget is not None

    def test_progressive_updates(self) -> None:
        """Test progressive content updates."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            states = ["Loading...", "Building graph...", "Rendering nodes...", "Complete: 10 nodes, 15 edges"]
            for state in states:
                widget.update(state)
            assert widget is not None


@pytest.mark.skipif(not TEXTUAL_AVAILABLE, reason="Textual not installed")
class TestGraphViewWidgetFormats:
    """Test different graph format representations."""

    def test_dot_format(self) -> None:
        """Test DOT format graph."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            dot_graph = """
            digraph G {
                A -> B;
                B -> C;
                C -> D;
            }
            """
            widget.update(dot_graph)
            assert widget is not None

    def test_adjacency_list(self) -> None:
        """Test adjacency list format."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            adj_list = "A: [B, C]\nB: [D]\nC: [D, E]\nD: []\nE: []"
            widget.update(adj_list)
            assert widget is not None

    def test_matrix_format(self) -> None:
        """Test matrix format."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            matrix = "  A B C\nA 0 1 1\nB 1 0 1\nC 1 1 0"
            widget.update(matrix)
            assert widget is not None

    def test_json_format(self) -> None:
        """Test JSON graph representation."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            json_graph = '{"nodes": ["A", "B"], "edges": [["A", "B"]]}'
            widget.update(json_graph)
            assert widget is not None


@pytest.mark.skipif(TEXTUAL_AVAILABLE, reason="Only test placeholder when Textual not installed")
class TestGraphViewWidgetPlaceholder:
    """Test placeholder class when Textual is not available."""

    def test_placeholder_exists(self) -> None:
        """Test placeholder class exists."""
        assert GraphViewWidget is not None

    def test_placeholder_instantiation(self) -> None:
        """Test placeholder can be instantiated."""
        widget = GraphViewWidget()
        assert widget is not None


class TestGraphViewWidgetAvailability:
    """Test widget availability detection."""

    def test_textual_availability_constant(self) -> None:
        """Test TEXTUAL_AVAILABLE constant is defined."""
        assert WIDGET_TEXTUAL is not None
        assert isinstance(WIDGET_TEXTUAL, bool)

    def test_textual_availability_matches(self) -> None:
        """Test module TEXTUAL_AVAILABLE matches test import."""
        assert WIDGET_TEXTUAL == TEXTUAL_AVAILABLE


@pytest.mark.skipif(not TEXTUAL_AVAILABLE, reason="Textual not installed")
class TestGraphViewWidgetDataTypes:
    """Test different data type representations."""

    def test_string_content(self) -> None:
        """Test string content."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            widget.update("Simple string graph")
            assert widget is not None

    def test_numeric_content(self) -> None:
        """Test numeric content."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            widget.update("Nodes: 10, Edges: 15")
            assert widget is not None

    def test_formatted_content(self) -> None:
        """Test formatted content."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            formatted = "Graph Statistics:\n  Nodes: 10\n  Edges: 15\n  Density: 0.3"
            widget.update(formatted)
            assert widget is not None

    def test_table_content(self) -> None:
        """Test table-like content."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            table = "ID    Label    Degree\n1     A        3\n2     B        2\n3     C        1"
            widget.update(table)
            assert widget is not None


@pytest.mark.skipif(not TEXTUAL_AVAILABLE, reason="Textual not installed")
class TestGraphViewWidgetState:
    """Test widget state management."""

    def test_initial_state(self) -> None:
        """Test widget initial state."""
        widget = GraphViewWidget()
        assert widget is not None

    def test_state_persistence(self) -> None:
        """Test state persists across updates."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            widget.update("State 1")
            # Widget should maintain state
            assert widget is not None
            widget.update("State 2")
            assert widget is not None

    def test_reset_to_default(self) -> None:
        """Test resetting to default state."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            widget.update("Custom content")
            widget.update("Graph View")  # Reset to default
            assert widget is not None


@pytest.mark.skipif(not TEXTUAL_AVAILABLE, reason="Textual not installed")
class TestGraphViewWidgetPerformance:
    """Test widget performance scenarios."""

    def test_rapid_updates(self) -> None:
        """Test rapid content updates."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            for i in range(100):
                widget.update(f"Update {i}")
            assert widget is not None

    def test_large_graph_content(self) -> None:
        """Test large graph content."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            nodes = "\n".join([f"Node_{i}" for i in range(1000)])
            widget.update(nodes)
            assert widget is not None

    def test_complex_graph(self) -> None:
        """Test complex graph representation."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            # Build complex graph text
            lines = [f"Node_{i} -> Node_{j}" for i in range(100) for j in range(i + 1, min(i + 10, 100))]
            content = "\n".join(lines)
            widget.update(content)
            assert widget is not None


@pytest.mark.skipif(not TEXTUAL_AVAILABLE, reason="Textual not installed")
class TestGraphViewWidgetCustomization:
    """Test widget customization options."""

    def test_custom_name(self) -> None:
        """Test widget with custom name."""
        widget = GraphViewWidget(name="my-graph")
        if hasattr(widget, "name"):
            assert widget.name == "my-graph"

    def test_custom_id(self) -> None:
        """Test widget with custom ID."""
        widget = GraphViewWidget(id="graph-1")
        assert widget.id == "graph-1"

    def test_disabled_state(self) -> None:
        """Test widget disabled state."""
        widget = GraphViewWidget(disabled=True)
        if hasattr(widget, "disabled"):
            assert widget.disabled is True

    def test_tooltip(self) -> None:
        """Test widget with tooltip."""
        widget = GraphViewWidget()
        if hasattr(widget, "tooltip"):
            widget.tooltip = "Graph visualization"
            assert widget.tooltip == "Graph visualization"


@pytest.mark.skipif(not TEXTUAL_AVAILABLE, reason="Textual not installed")
class TestGraphViewWidgetAccessibility:
    """Test widget accessibility features."""

    def test_widget_name_attribute(self) -> None:
        """Test widget has name attribute."""
        widget = GraphViewWidget(name="graph-view")
        if hasattr(widget, "name"):
            assert widget.name == "graph-view"

    def test_describable_content(self) -> None:
        """Test content can be described."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            widget.update("10 nodes, 15 edges, density: 0.3")
            assert widget is not None

    def test_structured_content(self) -> None:
        """Test structured accessible content."""
        widget = GraphViewWidget()
        if hasattr(widget, "update"):
            content = "Graph Structure:\nNodes: A, B, C\nEdges: A->B, B->C"
            widget.update(content)
            assert widget is not None
