/**
 * Tests for useGraphData Hook
 */

import { describe, it, expect } from 'vitest';
import { renderHook, act } from '@testing-library/react';
import { useGraphData } from '@/hooks/useGraphData';
import type { GraphData } from '@/types/rdf';

describe('useGraphData', () => {
  const sampleGraphData: GraphData = {
    nodes: [
      { id: 'node1', type: 'uri', label: 'Node 1' },
      { id: 'node2', type: 'literal', label: 'Node 2' },
      { id: 'node3', type: 'Agent', label: 'Node 3' },
    ],
    links: [
      { source: 'node1', target: 'node2', predicate: 'http://example.org/pred1', label: 'predicate 1' },
      { source: 'node2', target: 'node3', predicate: 'http://example.org/pred2', label: 'predicate 2' },
    ],
  };

  it('should initialize with empty state', () => {
    const { result } = renderHook(() => useGraphData());

    expect(result.current.nodes).toEqual([]);
    expect(result.current.links).toEqual([]);
    expect(result.current.filteredNodes).toEqual([]);
    expect(result.current.filteredLinks).toEqual([]);
    expect(result.current.nodeTypes).toEqual([]);
    expect(result.current.predicates).toEqual([]);
    expect(result.current.selectedNode).toBe(null);
    expect(result.current.stats.totalNodes).toBe(0);
    expect(result.current.stats.totalLinks).toBe(0);
  });

  it('should load graph data', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    expect(result.current.nodes).toEqual(sampleGraphData.nodes);
    expect(result.current.links).toEqual(sampleGraphData.links);
    expect(result.current.stats.totalNodes).toBe(3);
    expect(result.current.stats.totalLinks).toBe(2);
  });

  it('should extract node types', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    expect(result.current.nodeTypes).toContain('uri');
    expect(result.current.nodeTypes).toContain('literal');
    expect(result.current.nodeTypes).toContain('Agent');
    expect(result.current.nodeTypes.length).toBe(3);
  });

  it('should extract predicates', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    expect(result.current.predicates).toContain('http://example.org/pred1');
    expect(result.current.predicates).toContain('http://example.org/pred2');
    expect(result.current.predicates.length).toBe(2);
  });

  it('should filter nodes by type', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    act(() => {
      result.current.setFilters({ nodeTypes: new Set(['uri']) });
    });

    expect(result.current.filteredNodes.length).toBe(1);
    expect(result.current.filteredNodes[0].type).toBe('uri');
  });

  it('should filter nodes by search term', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    act(() => {
      result.current.setFilters({ searchTerm: 'Node 1' });
    });

    expect(result.current.filteredNodes.length).toBe(1);
    expect(result.current.filteredNodes[0].label).toBe('Node 1');
  });

  it('should filter links based on filtered nodes', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    // Filter to only node1
    act(() => {
      result.current.setFilters({ nodeTypes: new Set(['uri']) });
    });

    // Links should be empty because both endpoints aren't in filtered nodes
    expect(result.current.filteredLinks.length).toBe(0);
  });

  it('should filter links by predicate', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    act(() => {
      result.current.setFilters({ predicates: new Set(['http://example.org/pred1']) });
    });

    expect(result.current.filteredLinks.length).toBe(1);
    expect(result.current.filteredLinks[0].predicate).toBe('http://example.org/pred1');
  });

  it('should handle node selection', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    act(() => {
      result.current.setSelectedNode(sampleGraphData.nodes[0]);
    });

    expect(result.current.selectedNode).toEqual(sampleGraphData.nodes[0]);
  });

  it('should clear node selection', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
      result.current.setSelectedNode(sampleGraphData.nodes[0]);
    });

    expect(result.current.selectedNode).not.toBe(null);

    act(() => {
      result.current.setSelectedNode(null);
    });

    expect(result.current.selectedNode).toBe(null);
  });

  it('should reset filters', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
      result.current.setFilters({
        nodeTypes: new Set(['uri']),
        searchTerm: 'test',
      });
    });

    expect(result.current.filters.nodeTypes.size).toBe(1);
    expect(result.current.filters.searchTerm).toBe('test');

    act(() => {
      result.current.resetFilters();
    });

    expect(result.current.filters.nodeTypes.size).toBe(0);
    expect(result.current.filters.searchTerm).toBe('');
  });

  it('should clear graph data', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    expect(result.current.nodes.length).toBe(3);

    act(() => {
      result.current.clearGraphData();
    });

    expect(result.current.nodes.length).toBe(0);
    expect(result.current.links.length).toBe(0);
    expect(result.current.selectedNode).toBe(null);
  });

  it('should calculate stats correctly', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    expect(result.current.stats.totalNodes).toBe(3);
    expect(result.current.stats.totalLinks).toBe(2);
    expect(result.current.stats.filteredNodeCount).toBe(3);
    expect(result.current.stats.filteredLinkCount).toBe(2);

    // Apply filter
    act(() => {
      result.current.setFilters({ nodeTypes: new Set(['uri']) });
    });

    expect(result.current.stats.totalNodes).toBe(3); // Total unchanged
    expect(result.current.stats.filteredNodeCount).toBe(1); // Filtered count changed
  });

  it('should handle link counts', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    expect(result.current.linkCounts).toHaveProperty('http://example.org/pred1');
    expect(result.current.linkCounts['http://example.org/pred1']).toBe(1);
    expect(result.current.linkCounts['http://example.org/pred2']).toBe(1);
  });

  it('should handle node counts', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    expect(result.current.nodeCounts).toHaveProperty('uri');
    expect(result.current.nodeCounts['uri']).toBe(1);
    expect(result.current.nodeCounts['literal']).toBe(1);
    expect(result.current.nodeCounts['Agent']).toBe(1);
  });

  it('should combine multiple filters', () => {
    const { result } = renderHook(() => useGraphData());

    act(() => {
      result.current.loadGraphData(sampleGraphData);
    });

    act(() => {
      result.current.setFilters({
        nodeTypes: new Set(['uri', 'literal']),
        searchTerm: 'Node 1',
      });
    });

    // Only Node 1 should match (uri type AND "Node 1" in label)
    expect(result.current.filteredNodes.length).toBe(1);
    expect(result.current.filteredNodes[0].id).toBe('node1');
  });
});