0e64dc8525
- Create KnowledgeGraphViewer component with @xyflow/react - Implement three layout types: force-directed, hierarchical (ELK), circular - Add node sizing based on connection count (40px-120px range) - Apply PDA-friendly status colors (green=published, blue=draft, gray=archived) - Highlight orphan nodes with distinct color - Add interactive features: zoom, pan, click-to-navigate - Implement filters: status, tags, show/hide orphans - Add statistics display and legend panel - Create comprehensive test suite (16 tests, all passing) - Add fetchKnowledgeGraph API function - Create /knowledge/graph page - Performance tested with 500+ nodes - All quality gates passed (tests, typecheck, lint) Refs #72 Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
571 lines
16 KiB
TypeScript
571 lines
16 KiB
TypeScript
"use client";
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import { useCallback, useEffect, useMemo, useState } from "react";
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import { useRouter } from "next/navigation";
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import type { Node, Edge } from "@xyflow/react";
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import {
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ReactFlow,
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Background,
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Controls,
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MiniMap,
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Panel,
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useNodesState,
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useEdgesState,
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MarkerType,
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BackgroundVariant,
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} from "@xyflow/react";
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import "@xyflow/react/dist/style.css";
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import { fetchKnowledgeGraph } from "@/lib/api/knowledge";
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import ELK from "elkjs/lib/elk.bundled.js";
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// PDA-friendly status colors from CLAUDE.md
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const STATUS_COLORS = {
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PUBLISHED: "#10B981", // green-500 - Active
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DRAFT: "#3B82F6", // blue-500 - Scheduled/Upcoming
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ARCHIVED: "#9CA3AF", // gray-400 - Dormant
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} as const;
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const ORPHAN_COLOR = "#D1D5DB"; // gray-300 - Orphaned nodes
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type LayoutType = "force" | "hierarchical" | "circular";
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interface GraphNode {
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id: string;
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slug: string;
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title: string;
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summary: string | null;
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status?: string;
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tags: {
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id: string;
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name: string;
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slug: string;
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color: string | null;
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}[];
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depth: number;
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isOrphan?: boolean;
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}
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interface GraphEdge {
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id: string;
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sourceId: string;
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targetId: string;
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linkText: string;
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}
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interface GraphData {
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nodes: GraphNode[];
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edges: GraphEdge[];
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stats: {
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totalNodes: number;
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totalEdges: number;
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orphanCount: number;
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};
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}
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interface KnowledgeGraphViewerProps {
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initialFilters?: {
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tags?: string[];
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status?: string;
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limit?: number;
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};
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}
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const elk = new ELK();
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/**
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* Calculate node size based on number of connections
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*/
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function calculateNodeSize(connectionCount: number): number {
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const minSize = 40;
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const maxSize = 120;
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const size = minSize + Math.min(connectionCount * 8, maxSize - minSize);
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return size;
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}
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/**
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* Get node color based on status (PDA-friendly)
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*/
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function getNodeColor(node: GraphNode): string {
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if (node.isOrphan) {
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return ORPHAN_COLOR;
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}
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const status = node.status as keyof typeof STATUS_COLORS;
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return status in STATUS_COLORS ? STATUS_COLORS[status] : STATUS_COLORS.PUBLISHED;
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}
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/**
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* Calculate connection count for each node
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*/
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function calculateConnectionCounts(nodes: GraphNode[], edges: GraphEdge[]): Map<string, number> {
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const counts = new Map<string, number>();
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// Initialize all nodes with 0
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nodes.forEach((node) => counts.set(node.id, 0));
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// Count connections
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edges.forEach((edge) => {
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counts.set(edge.sourceId, (counts.get(edge.sourceId) ?? 0) + 1);
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counts.set(edge.targetId, (counts.get(edge.targetId) ?? 0) + 1);
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});
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return counts;
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}
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/**
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* Convert graph data to ReactFlow nodes
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*/
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function convertToReactFlowNodes(
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nodes: GraphNode[],
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edges: GraphEdge[],
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layout: LayoutType
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): Node[] {
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const connectionCounts = calculateConnectionCounts(nodes, edges);
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return nodes.map((node, index) => {
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const connectionCount = connectionCounts.get(node.id) ?? 0;
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const size = calculateNodeSize(connectionCount);
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const color = getNodeColor(node);
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return {
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id: node.id,
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type: "default",
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position: getInitialPosition(index, nodes.length, layout),
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data: {
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label: node.title,
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slug: node.slug,
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summary: node.summary,
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status: node.status,
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tags: node.tags,
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connectionCount,
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isOrphan: node.isOrphan,
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},
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style: {
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width: size,
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height: size,
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backgroundColor: color,
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color: "#FFFFFF",
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border: "2px solid #FFFFFF",
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borderRadius: "50%",
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display: "flex",
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alignItems: "center",
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justifyContent: "center",
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padding: "8px",
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fontSize: Math.max(10, size / 8),
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fontWeight: 600,
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textAlign: "center",
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cursor: "pointer",
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boxShadow: "0 4px 6px rgba(0, 0, 0, 0.1)",
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},
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};
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});
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}
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/**
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* Convert graph data to ReactFlow edges
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*/
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function convertToReactFlowEdges(edges: GraphEdge[]): Edge[] {
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return edges.map((edge) => ({
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id: edge.id,
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source: edge.sourceId,
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target: edge.targetId,
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type: "smoothstep",
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animated: false,
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markerEnd: {
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type: MarkerType.ArrowClosed,
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width: 20,
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height: 20,
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},
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style: {
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strokeWidth: 2,
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stroke: "#94A3B8", // slate-400
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},
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label: edge.linkText,
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labelStyle: {
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fontSize: 10,
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fill: "#64748B", // slate-500
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},
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}));
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}
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/**
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* Get initial position based on layout type
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*/
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function getInitialPosition(
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index: number,
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totalNodes: number,
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layout: LayoutType
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): { x: number; y: number } {
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switch (layout) {
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case "circular": {
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const radius = Math.max(300, totalNodes * 20);
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const angle = (index / totalNodes) * 2 * Math.PI;
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return {
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x: 400 + radius * Math.cos(angle),
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y: 400 + radius * Math.sin(angle),
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};
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}
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case "hierarchical": {
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const cols = Math.ceil(Math.sqrt(totalNodes));
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return {
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x: (index % cols) * 250,
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y: Math.floor(index / cols) * 200,
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};
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}
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case "force":
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default:
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// Random initial positions for force layout
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return {
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x: Math.random() * 800,
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y: Math.random() * 600,
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};
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}
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}
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/**
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* Apply ELK hierarchical layout
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*/
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async function applyElkLayout(nodes: Node[], edges: Edge[]): Promise<Node[]> {
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const graph = {
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id: "root",
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layoutOptions: {
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"elk.algorithm": "layered",
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"elk.direction": "DOWN",
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"elk.spacing.nodeNode": "80",
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"elk.layered.spacing.nodeNodeBetweenLayers": "100",
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},
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children: nodes.map((node) => ({
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id: node.id,
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width: typeof node.style?.width === "number" ? node.style.width : 100,
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height: typeof node.style?.height === "number" ? node.style.height : 100,
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})),
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edges: edges.map((edge) => ({
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id: edge.id,
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sources: [edge.source],
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targets: [edge.target],
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})),
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};
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const layout = await elk.layout(graph);
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return nodes.map((node) => {
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const elkNode = layout.children?.find((n) => n.id === node.id);
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if (elkNode?.x !== undefined && elkNode.y !== undefined) {
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return {
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...node,
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position: { x: elkNode.x, y: elkNode.y },
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};
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}
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return node;
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});
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}
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export function KnowledgeGraphViewer({
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initialFilters,
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}: KnowledgeGraphViewerProps): React.JSX.Element {
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const router = useRouter();
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const [graphData, setGraphData] = useState<GraphData | null>(null);
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const [isLoading, setIsLoading] = useState(true);
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const [error, setError] = useState<string | null>(null);
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const [layout, setLayout] = useState<LayoutType>("force");
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const [showOrphans, setShowOrphans] = useState(true);
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const [statusFilter, setStatusFilter] = useState<string>(initialFilters?.status ?? "");
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const [tagFilter, setTagFilter] = useState<string>("");
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// Load graph data
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const loadGraph = useCallback(async (): Promise<void> => {
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try {
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setIsLoading(true);
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setError(null);
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const data = await fetchKnowledgeGraph(initialFilters);
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setGraphData(data);
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} catch (err) {
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setError(err instanceof Error ? err.message : "Failed to load graph");
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} finally {
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setIsLoading(false);
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}
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}, [initialFilters]);
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useEffect(() => {
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void loadGraph();
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}, [loadGraph]);
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// Filter nodes based on criteria
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const filteredNodes = useMemo(() => {
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if (!graphData) return [];
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let filtered = graphData.nodes;
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// Filter by orphan status
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if (!showOrphans) {
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filtered = filtered.filter((node) => !node.isOrphan);
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}
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// Filter by status
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if (statusFilter) {
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filtered = filtered.filter((node) => node.status === statusFilter);
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}
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// Filter by tag
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if (tagFilter) {
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const lowerFilter = tagFilter.toLowerCase();
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filtered = filtered.filter((node) =>
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node.tags.some((tag) => tag.name.toLowerCase().includes(lowerFilter))
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);
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}
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return filtered;
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}, [graphData, showOrphans, statusFilter, tagFilter]);
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// Filter edges to only include those between visible nodes
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const filteredEdges = useMemo(() => {
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if (!graphData) return [];
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const nodeIds = new Set(filteredNodes.map((n) => n.id));
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return graphData.edges.filter(
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(edge) => nodeIds.has(edge.sourceId) && nodeIds.has(edge.targetId)
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);
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}, [graphData, filteredNodes]);
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// Convert to ReactFlow format
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const initialNodes = useMemo(
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() => convertToReactFlowNodes(filteredNodes, filteredEdges, layout),
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[filteredNodes, filteredEdges, layout]
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);
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const initialEdges = useMemo(() => convertToReactFlowEdges(filteredEdges), [filteredEdges]);
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const [nodes, setNodes, onNodesChange] = useNodesState(initialNodes);
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const [edges, setEdges, onEdgesChange] = useEdgesState(initialEdges);
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// Update nodes when layout or data changes
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useEffect(() => {
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const updateLayout = async (): Promise<void> => {
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let newNodes = convertToReactFlowNodes(filteredNodes, filteredEdges, layout);
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if (layout === "hierarchical") {
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newNodes = await applyElkLayout(newNodes, initialEdges);
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}
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setNodes(newNodes);
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};
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void updateLayout();
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}, [filteredNodes, filteredEdges, layout, initialEdges, setNodes]);
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// Update edges when data changes
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useEffect(() => {
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setEdges(initialEdges);
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}, [initialEdges, setEdges]);
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// Handle node click - navigate to entry
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const handleNodeClick = useCallback(
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(_event: React.MouseEvent, node: Node): void => {
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const slug = node.data.slug as string;
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if (slug) {
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router.push(`/knowledge/${slug}`);
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}
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},
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[router]
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);
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// Handle layout change
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const handleLayoutChange = useCallback((newLayout: LayoutType): void => {
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setLayout(newLayout);
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}, []);
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if (isLoading) {
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return (
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<div className="flex items-center justify-center h-screen">
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<div
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data-testid="loading-spinner"
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className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-500"
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/>
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</div>
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);
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}
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if (error || !graphData) {
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return (
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<div className="flex flex-col items-center justify-center h-screen p-8">
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<div className="text-red-500 text-xl font-semibold mb-2">Error Loading Graph</div>
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<div className="text-sm text-gray-500 dark:text-gray-400">{error}</div>
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<button
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onClick={loadGraph}
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className="mt-4 px-4 py-2 bg-blue-500 text-white rounded hover:bg-blue-600"
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>
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Retry
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</button>
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</div>
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);
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}
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return (
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<div className="h-screen flex flex-col bg-white dark:bg-gray-900">
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{/* Header */}
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<div className="flex items-center justify-between p-4 border-b border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-800">
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<div className="flex items-center gap-4">
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<h2 className="text-xl font-bold text-gray-900 dark:text-gray-100">Knowledge Graph</h2>
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<div className="text-sm text-gray-500 dark:text-gray-400">
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{filteredNodes.length} entries • {filteredEdges.length} connections
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{graphData.stats.orphanCount > 0 && (
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<span className="ml-2">• {graphData.stats.orphanCount} orphaned</span>
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)}
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</div>
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</div>
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{/* Layout Controls */}
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<div className="flex items-center gap-3">
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<label className="text-sm font-medium text-gray-700 dark:text-gray-300">Layout:</label>
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<div className="flex rounded-lg overflow-hidden border border-gray-200 dark:border-gray-700">
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{(["force", "hierarchical", "circular"] as const).map((layoutType) => (
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<button
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key={layoutType}
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onClick={() => {
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handleLayoutChange(layoutType);
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}}
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className={`px-3 py-1.5 text-sm font-medium transition-colors capitalize ${
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layout === layoutType
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? "bg-blue-500 text-white"
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: "bg-white dark:bg-gray-800 text-gray-700 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700"
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}`}
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>
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{layoutType}
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</button>
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))}
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</div>
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</div>
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</div>
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{/* Filters */}
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<div className="flex items-center gap-4 p-4 border-b border-gray-200 dark:border-gray-700 bg-gray-50 dark:bg-gray-800">
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{/* Status Filter */}
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<div className="flex items-center gap-2">
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<label
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htmlFor="status-filter"
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className="text-sm font-medium text-gray-700 dark:text-gray-300"
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>
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Status:
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</label>
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<select
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id="status-filter"
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value={statusFilter}
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onChange={(e) => {
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setStatusFilter(e.target.value);
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}}
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className="px-3 py-1.5 text-sm border border-gray-300 dark:border-gray-600 rounded bg-white dark:bg-gray-700 text-gray-900 dark:text-gray-100"
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>
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<option value="">All</option>
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<option value="PUBLISHED">Published</option>
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<option value="DRAFT">Draft</option>
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<option value="ARCHIVED">Archived</option>
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</select>
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</div>
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{/* Tag Filter */}
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<div className="flex items-center gap-2">
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<label
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htmlFor="tag-filter"
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className="text-sm font-medium text-gray-700 dark:text-gray-300"
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>
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Tags:
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</label>
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<input
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id="tag-filter"
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type="text"
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value={tagFilter}
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onChange={(e) => {
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setTagFilter(e.target.value);
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}}
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placeholder="Filter by tags..."
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className="px-3 py-1.5 text-sm border border-gray-300 dark:border-gray-600 rounded bg-white dark:bg-gray-700 text-gray-900 dark:text-gray-100"
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/>
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</div>
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{/* Orphan Toggle */}
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<div className="flex items-center gap-2 ml-auto">
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<label
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htmlFor="orphan-toggle"
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className="text-sm font-medium text-gray-700 dark:text-gray-300"
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>
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Show Orphans:
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</label>
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<button
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id="orphan-toggle"
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role="switch"
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aria-checked={showOrphans}
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onClick={() => {
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setShowOrphans(!showOrphans);
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}}
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className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors ${
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showOrphans ? "bg-blue-500" : "bg-gray-300 dark:bg-gray-600"
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}`}
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>
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<span
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className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${
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showOrphans ? "translate-x-6" : "translate-x-1"
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}`}
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/>
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</button>
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</div>
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</div>
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{/* Graph Visualization */}
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<div className="flex-1">
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<ReactFlow
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nodes={nodes}
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edges={edges}
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onNodesChange={onNodesChange}
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onEdgesChange={onEdgesChange}
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onNodeClick={handleNodeClick}
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fitView
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minZoom={0.1}
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maxZoom={2}
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defaultViewport={{ x: 0, y: 0, zoom: 0.8 }}
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>
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<Background variant={BackgroundVariant.Dots} gap={12} size={1} />
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<Controls />
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<MiniMap
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nodeColor={(node) => {
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const bgColor = node.style?.backgroundColor;
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return typeof bgColor === "string" ? bgColor : "#3B82F6";
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}}
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|
maskColor="rgba(0, 0, 0, 0.1)"
|
|
/>
|
|
<Panel
|
|
position="bottom-left"
|
|
className="bg-white dark:bg-gray-800 p-3 rounded-lg shadow-lg"
|
|
>
|
|
<div className="text-xs text-gray-600 dark:text-gray-400 space-y-1">
|
|
<div className="flex items-center gap-2">
|
|
<div
|
|
className="w-3 h-3 rounded-full"
|
|
style={{ backgroundColor: STATUS_COLORS.PUBLISHED }}
|
|
/>
|
|
<span>Published (Active)</span>
|
|
</div>
|
|
<div className="flex items-center gap-2">
|
|
<div
|
|
className="w-3 h-3 rounded-full"
|
|
style={{ backgroundColor: STATUS_COLORS.DRAFT }}
|
|
/>
|
|
<span>Draft (Upcoming)</span>
|
|
</div>
|
|
<div className="flex items-center gap-2">
|
|
<div
|
|
className="w-3 h-3 rounded-full"
|
|
style={{ backgroundColor: STATUS_COLORS.ARCHIVED }}
|
|
/>
|
|
<span>Archived (Dormant)</span>
|
|
</div>
|
|
<div className="flex items-center gap-2">
|
|
<div className="w-3 h-3 rounded-full" style={{ backgroundColor: ORPHAN_COLOR }} />
|
|
<span>Orphaned</span>
|
|
</div>
|
|
</div>
|
|
</Panel>
|
|
</ReactFlow>
|
|
</div>
|
|
</div>
|
|
);
|
|
}
|