/**
 * Tests for Graph Utilities
 */

import { describe, it, expect } from 'vitest';
import {
  getNodeColor,
  getNodeRadius,
  calculateNodeDegree,
  getConnectedNodes,
  findHubNodes,
  filterNodesByType,
  getUniqueNodeTypes,
  getUniquePredicates,
  calculateGraphStats,
  formatNodeForExport,
  formatLinkForExport,
} from '@/lib/rdf/graph-utils';
import type { GraphNode, GraphLink } from '@/types/rdf';

describe('Graph Utilities - Node Operations', () => {
  const sampleNodes: GraphNode[] = [
    { id: 'node1', label: 'Node 1', uri: 'http://example.org/node1', type: 'Record' },
    { id: 'node2', label: 'Node 2', uri: 'http://example.org/node2', type: 'Person' },
    { id: 'node3', label: 'Node 3', uri: 'http://example.org/node3', type: 'Place' },
    { id: 'node4', label: 'Node 4', uri: 'http://example.org/node4', type: 'Record' },
  ];

  const sampleLinks: GraphLink[] = [
    {
      source: 'node1',
      target: 'node2',
      predicate: 'author',
      value: 1,
      isReversed: false,
      isBidirectional: false,
    },
    {
      source: 'node1',
      target: 'node3',
      predicate: 'place',
      value: 1,
      isReversed: false,
      isBidirectional: false,
    },
    {
      source: 'node2',
      target: 'node3',
      predicate: 'located at',
      value: 1,
      isReversed: false,
      isBidirectional: false,
    },
  ];

  it('should get node color by type', () => {
    expect(getNodeColor('Record')).toBe('#4A90E2');
    expect(getNodeColor('Person')).toBe('#F39C12');
    expect(getNodeColor('Place')).toBe('#2ECC71');
  });

  it('should calculate node radius based on connections', () => {
    const radius1 = getNodeRadius(sampleNodes[0], sampleLinks);
    const radius2 = getNodeRadius(sampleNodes[1], sampleLinks);

    expect(radius1).toBeGreaterThan(8);
    expect(radius2).toBeGreaterThan(8);
  });

  it('should filter nodes by type', () => {
    const records = filterNodesByType(sampleNodes, ['Record']);
    expect(records).toHaveLength(2);
    expect(records.every((n) => n.type === 'Record')).toBe(true);

    const people = filterNodesByType(sampleNodes, ['Person']);
    expect(people).toHaveLength(1);
  });

  it('should get unique node types', () => {
    const types = getUniqueNodeTypes(sampleNodes);
    expect(types).toContain('Record');
    expect(types).toContain('Person');
    expect(types).toContain('Place');
    expect(types).toHaveLength(3);
  });

  it('should format node for export', () => {
    const exported = formatNodeForExport(sampleNodes[0]);
    expect(exported).toHaveProperty('id');
    expect(exported).toHaveProperty('label');
    expect(exported).toHaveProperty('uri');
    expect(exported).toHaveProperty('type');
  });
});

describe('Graph Utilities - Link Operations', () => {
  const sampleLinks: GraphLink[] = [
    {
      source: 'node1',
      target: 'node2',
      predicate: 'author',
      value: 1,
      isReversed: false,
      isBidirectional: false,
    },
    {
      source: 'node1',
      target: 'node3',
      predicate: 'place',
      value: 1,
      isReversed: false,
      isBidirectional: false,
    },
    {
      source: 'node2',
      target: 'node3',
      predicate: 'author',
      value: 1,
      isReversed: false,
      isBidirectional: false,
    },
  ];

  it('should get unique predicates', () => {
    const predicates = getUniquePredicates(sampleLinks);
    expect(predicates).toContain('author');
    expect(predicates).toContain('place');
    expect(predicates).toHaveLength(2);
  });

  it('should format link for export', () => {
    const exported = formatLinkForExport(sampleLinks[0]);
    expect(exported).toHaveProperty('source');
    expect(exported).toHaveProperty('target');
    expect(exported).toHaveProperty('predicate');
  });
});

describe('Graph Utilities - Node Degree', () => {
  const sampleLinks: GraphLink[] = [
    { source: 'node1', target: 'node2', predicate: 'p1', value: 1, isReversed: false, isBidirectional: false },
    { source: 'node1', target: 'node3', predicate: 'p2', value: 1, isReversed: false, isBidirectional: false },
    { source: 'node2', target: 'node3', predicate: 'p3', value: 1, isReversed: false, isBidirectional: false },
    { source: 'node4', target: 'node1', predicate: 'p4', value: 1, isReversed: false, isBidirectional: false },
  ];

  it('should calculate node degree', () => {
    const degree1 = calculateNodeDegree('node1', sampleLinks);
    expect(degree1.outDegree).toBe(2);
    expect(degree1.inDegree).toBe(1);
    expect(degree1.totalDegree).toBe(3);

    const degree2 = calculateNodeDegree('node2', sampleLinks);
    expect(degree2.outDegree).toBe(1);
    expect(degree2.inDegree).toBe(1);
    expect(degree2.totalDegree).toBe(2);
  });

  it('should get connected nodes', () => {
    const connections = getConnectedNodes('node1', sampleLinks);
    expect(connections.outgoing).toContain('node2');
    expect(connections.outgoing).toContain('node3');
    expect(connections.incoming).toContain('node4');
  });

  it('should find hub nodes', () => {
    const sampleNodes: GraphNode[] = [
      { id: 'node1', label: 'Node 1', uri: 'uri1', type: 'Record' },
      { id: 'node2', label: 'Node 2', uri: 'uri2', type: 'Record' },
      { id: 'node3', label: 'Node 3', uri: 'uri3', type: 'Record' },
      { id: 'node4', label: 'Node 4', uri: 'uri4', type: 'Record' },
    ];

    const hubs = findHubNodes(sampleNodes, sampleLinks, 2);
    expect(hubs.length).toBeGreaterThan(0);
  });
});

describe('Graph Statistics', () => {
  const sampleNodes: GraphNode[] = [
    { id: 'node1', label: 'Node 1', uri: 'uri1', type: 'Record' },
    { id: 'node2', label: 'Node 2', uri: 'uri2', type: 'Person' },
    { id: 'node3', label: 'Node 3', uri: 'uri3', type: 'Record' },
  ];

  const sampleLinks: GraphLink[] = [
    { source: 'node1', target: 'node2', predicate: 'author', value: 1, isReversed: false, isBidirectional: false },
    { source: 'node1', target: 'node3', predicate: 'part of', value: 1, isReversed: false, isBidirectional: false },
  ];

  it('should calculate graph statistics', () => {
    const stats = calculateGraphStats(sampleNodes, sampleLinks);

    expect(stats.nodeCount).toBe(3);
    expect(stats.linkCount).toBe(2);
    expect(stats.nodeTypes['Record']).toBe(2);
    expect(stats.nodeTypes['Person']).toBe(1);
    expect(stats.predicates['author']).toBe(1);
    expect(stats.predicates['part of']).toBe(1);
    expect(stats.avgDegree).toBeGreaterThan(0);
  });
});