"""Integration tests for Visualization V2.0 flow.

Tests end-to-end workflows for hierarchical list-based navigation.
"""

# Note: These are conceptual integration tests that would run in a browser environment
# They serve as documentation and can be adapted to Selenium/Playwright tests


class TestDirectoryExpansion:
    """Tests for directory expansion workflow."""

    def test_click_directory_expands_horizontally(self):
        """
        Test: Click directory → See horizontal fan layout

        Steps:
            1. Load visualization with root directories
            2. Click on a directory node
            3. Verify children appear in horizontal fan layout
            4. Verify arc spans 180° from left to right
            5. Verify children are sorted alphabetically
        """
        # This would be implemented with Playwright/Selenium
        # Example structure:
        # browser.visit(visualization_url)
        # root_nodes = browser.find_all('.node.directory')
        # first_dir = root_nodes[0]
        # first_dir.click()
        # children = browser.find_all('.node.in-fan')
        # assert len(children) > 0
        # # Verify horizontal positions span left-to-right
        pass

    def test_click_sibling_closes_previous(self):
        """
        Test: Click sibling directory → Previous closes

        Steps:
            1. Load visualization
            2. Click directory D1 → Verify children visible
            3. Click sibling directory D2 → Verify D1's children hidden
            4. Verify D2's children visible
            5. Verify only one expansion path active
        """
        # Expected: Sibling exclusivity enforced
        pass

    def test_collapse_button_returns_to_list(self):
        """
        Test: Click collapse button → Returns to list view

        Steps:
            1. Load visualization
            2. Click directory → Verify fan layout
            3. Click collapse button ("-" indicator)
            4. Verify fan collapses
            5. Verify returns to list view
        """
        pass


class TestFileExpansion:
    """Tests for file expansion workflow."""

    def test_click_file_shows_ast_chunks(self):
        """
        Test: Click file → See AST chunks in fan layout

        Steps:
            1. Expand directory
            2. Click file node
            3. Verify AST chunks appear (functions, classes)
            4. Verify chunks positioned in horizontal fan
            5. Verify only AST call edges shown
        """
        pass

    def test_ast_edges_only_in_file_fan(self):
        """
        Test: AST call edges shown ONLY in file fan mode

        Steps:
            1. Load visualization (list view) → No edges
            2. Expand directory → No edges
            3. Expand file → AST call edges visible
            4. Collapse file → Edges disappear
        """
        pass


class TestBreadcrumbNavigation:
    """Tests for breadcrumb navigation."""

    def test_breadcrumbs_reflect_expansion_path(self):
        """
        Test: Breadcrumbs update with expansion path

        Steps:
            1. Load visualization → Breadcrumb shows "Root"
            2. Expand Dir1 → Breadcrumb shows "Root / Dir1"
            3. Expand File1 → Breadcrumb shows "Root / Dir1 / File1"
            4. Verify clickable segments
        """
        pass

    def test_click_breadcrumb_navigates_back(self):
        """
        Test: Click breadcrumb segment → Navigate back to that level

        Steps:
            1. Expand: Root > Dir1 > Dir2 > File1
            2. Click "Dir1" in breadcrumb
            3. Verify collapses Dir2 and File1
            4. Verify Dir1's children still visible
        """
        pass


class TestStateManagement:
    """Tests for state consistency."""

    def test_expansion_path_maintained(self):
        """
        Test: Expansion path correctly tracks hierarchy

        Verify:
            - Path starts empty
            - Each expand adds to path
            - Collapse removes from path
            - Path never has duplicates
        """
        pass

    def test_sibling_exclusivity_enforced(self):
        """
        Test: Only one sibling expanded per depth

        Verify:
            - Expanding Dir2 while Dir1 is open closes Dir1
            - Expansion path updates correctly
            - Visible nodes updated
        """
        pass

    def test_view_mode_transitions(self):
        """
        Test: View mode transitions correctly

        States:
            - Initial: LIST
            - After expand directory: DIRECTORY_FAN
            - After expand file: FILE_FAN
            - After collapse all: LIST
        """
        pass


class TestEdgeFiltering:
    """Tests for edge visibility rules."""

    def test_no_edges_in_list_mode(self):
        """
        Test: List mode shows no edges

        Verify:
            - Root list view has 0 visible edges
            - Only nodes visible
        """
        pass

    def test_no_edges_in_directory_fan(self):
        """
        Test: Directory fan mode shows no edges

        Verify:
            - Expanded directory fan has 0 visible edges
            - Containment implied by layout, not shown
        """
        pass

    def test_caller_edges_in_file_fan(self):
        """
        Test: File fan mode shows only caller edges

        Verify:
            - Expanded file shows AST call edges
            - Only edges where source.file_path == target.file_path
            - Edge type is "caller"
            - No semantic, import, or containment edges
        """
        pass


class TestAnimations:
    """Tests for animation smoothness."""

    def test_smooth_transitions_between_layouts(self):
        """
        Test: Animations are smooth (60fps target)

        Measure:
            - Frame rate during expand/collapse
            - Transition duration (should be 750ms)
            - No visual jank or stuttering
        """
        pass

    def test_fade_in_out_effects(self):
        """
        Test: Nodes fade in/out smoothly

        Verify:
            - New nodes fade in from 0 to 1 opacity
            - Removed nodes fade out from 1 to 0 opacity
            - Opacity transitions are smooth
        """
        pass


class TestPerformance:
    """Performance benchmarks for V2.0."""

    def test_expand_performance_under_100ms(self):
        """
        Test: Expand operation completes in <100ms

        Benchmark:
            - Directory with 50 children
            - Measure time from click to render complete
            - Target: <100ms
            - Acceptance: <200ms
        """
        pass

    def test_render_500_nodes_under_100ms(self):
        """
        Test: Rendering 500 nodes completes in <100ms

        Benchmark:
            - Graph with 500 total nodes
            - Measure render time
            - Target: <100ms
        """
        pass

    def test_edge_filtering_1000_edges_under_50ms(self):
        """
        Test: Edge filtering with 1000 edges completes in <50ms

        Benchmark:
            - Graph with 1000 edges
            - Measure filter function execution
            - Target: <50ms
        """
        pass


class TestKeyboardNavigation:
    """Tests for keyboard shortcuts."""

    def test_escape_key_closes_current_node(self):
        """
        Test: Escape key collapses current expanded node

        Steps:
            1. Expand directory
            2. Press Escape
            3. Verify directory collapses
        """
        pass

    def test_backspace_navigates_up_one_level(self):
        """
        Test: Backspace key navigates up one level

        Steps:
            1. Expand: Root > Dir1 > File1
            2. Press Backspace
            3. Verify File1 collapses, Dir1 still expanded
        """
        pass

    def test_home_key_resets_to_list_view(self):
        """
        Test: Home key resets to initial list view

        Steps:
            1. Expand multiple levels
            2. Press Home
            3. Verify all collapsed, back to list view
        """
        pass


class TestErrorHandling:
    """Tests for error conditions."""

    def test_handles_node_without_children(self):
        """
        Test: Clicking node with no children doesn't crash

        Verify:
            - Click on file with no AST chunks
            - Verify graceful handling (content pane shows, no crash)
        """
        pass

    def test_handles_missing_node_ids(self):
        """
        Test: Missing node IDs handled gracefully

        Verify:
            - Nodes without 'id' skipped in layout
            - No JavaScript errors
            - Warning logged to console
        """
        pass

    def test_handles_circular_references(self):
        """
        Test: Circular function calls handled gracefully

        Verify:
            - Circular call edges displayed
            - No infinite loops in layout
            - Edges clearly indicate cycles
        """
        pass


# Acceptance Criteria Checklist (from design spec)

ACCEPTANCE_CRITERIA = {
    "FR-1: List View (Root Level)": [
        "Root nodes displayed in vertical column",
        "Alphabetical sorting maintained",
        "Directories shown before files at same depth",
        "Click triggers expansion without moving other nodes",
        "Smooth scroll to view all nodes",
    ],
    "FR-2: Directory Expansion (Horizontal Fan)": [
        "Children appear in horizontal arc from parent",
        "Fan radius adapts to child count",
        "Sibling directories mutually exclusive",
        "Collapse button clearly visible",
        "Smooth open/close animation",
    ],
    "FR-3: File Expansion (AST Chunks)": [
        "AST chunks displayed in fan layout",
        "Only actual function calls shown as edges",
        "No implicit relationships rendered",
        "Chunk type icons clearly visible",
        "Click chunk to view code",
    ],
    "FR-4: File Viewer (Unchanged)": [
        "Existing content pane works with new layout",
        "Breadcrumbs reflect expansion path",
        "Code viewer unchanged",
    ],
    "NFR-1: Performance": [
        "Rendering: <100ms per expand/collapse action",
        "Animation: 60fps smooth transitions",
        "Large Directories: Handle 500+ children in fan",
    ],
    "NFR-2: Usability": [
        "Discoverability: Expandable nodes clearly indicated",
        "Feedback: Immediate visual response to clicks",
        "Consistency: Predictable navigation patterns",
    ],
    "NFR-3: Accessibility": [
        "Keyboard: Tab navigation, Enter to expand",
        "Screen Readers: ARIA labels on all interactive elements",
        "Contrast: WCAG AA compliant colors",
    ],
}


def test_acceptance_criteria_documented():
    """Document all acceptance criteria for manual testing."""
    # This test ensures the acceptance criteria are captured
    assert len(ACCEPTANCE_CRITERIA) == 7
    assert "FR-1: List View (Root Level)" in ACCEPTANCE_CRITERIA
    assert "NFR-1: Performance" in ACCEPTANCE_CRITERIA
