/**
 * Tests for RDF Parser
 */

import { describe, it, expect } from 'vitest';
import {
  parseNTriples,
  parseTurtle,
  predicateToLabel,
  getShortLabel,
  inferTypeFromUri,
  getReversePredicate,
  isBidirectional,
  reverseLink,
} from '@/lib/rdf/parser';
import type { GraphLink } from '@/types/rdf';

describe('RDF Parser - N-Triples', () => {
  it('should parse simple N-Triples', () => {
    const ntriples = `
<http://example.org/record1> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <https://www.ica.org/standards/RiC/ontology#Record> .
<http://example.org/record1> <http://www.w3.org/2000/01/rdf-schema#label> "Test Record" .
<http://example.org/record1> <https://www.ica.org/standards/RiC/ontology#isOrWasConstituentOf> <http://example.org/recordset1> .
`;

    const result = parseNTriples(ntriples);

    // 3 nodes: record1, recordset1, and literal node for "Test Record"
    expect(result.nodes).toHaveLength(3);
    // 2 links: label link and isOrWasConstituentOf link
    expect(result.links).toHaveLength(2);
    expect(result.error).toBeUndefined();

    const record = result.nodes.find((n) => n.id === 'http://example.org/record1');
    expect(record).toBeDefined();
    expect(record?.type).toBe('Record');
    expect(record?.label).toBe('Test Record');
  });

  it('should handle literals', () => {
    const ntriples = `
<http://example.org/record1> <http://www.w3.org/2000/01/rdf-schema#label> "Test Label" .
<http://example.org/record1> <http://purl.org/dc/terms/description> "Test Description" .
`;

    const result = parseNTriples(ntriples);

    expect(result.nodes.length).toBeGreaterThan(1);
    expect(result.links).toHaveLength(2);

    const literalNodes = result.nodes.filter((n) => n.type === 'Literal');
    expect(literalNodes.length).toBeGreaterThan(0);
  });

  it('should skip comments and empty lines', () => {
    const ntriples = `
# This is a comment
<http://example.org/record1> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <https://www.ica.org/standards/RiC/ontology#Record> .

# Another comment
<http://example.org/record1> <http://www.w3.org/2000/01/rdf-schema#label> "Test" .
`;

    const result = parseNTriples(ntriples);

    // 2 nodes: record1 and literal node for "Test" 
    expect(result.nodes).toHaveLength(2);
    // 1 link: label link (type is processed as metadata only)
    expect(result.links).toHaveLength(1);
  });

  it('should mark bidirectional relationships', () => {
    const ntriples = `
<http://example.org/record1> <https://www.ica.org/standards/RiC/ontology#isOrWasConstituentOf> <http://example.org/recordset1> .
`;

    const result = parseNTriples(ntriples);

    expect(result.links).toHaveLength(1);
    expect(result.links[0].isBidirectional).toBe(true);
  });
});

describe('RDF Parser - Turtle', () => {
  it('should parse Turtle with prefixes', () => {
    const turtle = `
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix rico: <https://www.ica.org/standards/RiC/ontology#> .

<http://example.org/record1> rdf:type rico:Record ;
  rdfs:label "Test Record" ;
  rico:isOrWasConstituentOf <http://example.org/recordset1> .
`;

    const result = parseTurtle(turtle);

    expect(result.nodes.length).toBeGreaterThan(0);
    expect(result.links.length).toBeGreaterThan(0);
  });

  it('should handle multiple objects', () => {
    const turtle = `
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .

<http://example.org/record1> rdfs:label "Label 1", "Label 2", "Label 3" .
`;

    const result = parseTurtle(turtle);

    expect(result.nodes.length).toBeGreaterThan(1);
    expect(result.links).toHaveLength(3);
  });
});

describe('Helper Functions', () => {
  it('should convert predicate to label', () => {
    expect(predicateToLabel('http://www.w3.org/2000/01/rdf-schema#label')).toBe('label');
    expect(predicateToLabel('https://www.ica.org/standards/RiC/ontology#hasProvenance')).toBe(
      'has provenance'
    );
    expect(predicateToLabel('http://example.org/customPredicate')).toBe('custom predicate');
  });

  it('should get short label from URI', () => {
    expect(getShortLabel('http://example.org/record1')).toBe('record1');
    expect(getShortLabel('https://www.ica.org/standards/RiC/ontology#Record')).toBe('Record');
  });

  it('should infer type from URI', () => {
    expect(inferTypeFromUri('https://www.ica.org/standards/RiC/ontology#Record')).toBe('Record');
    expect(inferTypeFromUri('https://www.ica.org/standards/RiC/ontology#Person')).toBe('Person');
    expect(inferTypeFromUri('https://www.ica.org/standards/RiC/ontology#Place')).toBe('Place');
    expect(inferTypeFromUri('http://example.org/UnknownType')).toBe('Resource');
  });

  it('should check bidirectional predicates', () => {
    expect(
      isBidirectional('https://www.ica.org/standards/RiC/ontology#isOrWasConstituentOf')
    ).toBe(true);
    expect(isBidirectional('http://www.w3.org/2000/01/rdf-schema#label')).toBe(false);
  });

  it('should get reverse predicate', () => {
    const reversePredicate = getReversePredicate(
      'https://www.ica.org/standards/RiC/ontology#isOrWasConstituentOf'
    );
    expect(reversePredicate).toBe(
      'https://www.ica.org/standards/RiC/ontology#hasOrHadConstituent'
    );
  });

  it('should reverse a link', () => {
    const link: GraphLink = {
      source: 'node1',
      target: 'node2',
      predicate: 'part of',
      value: 1,
      originalPredicate: 'https://www.ica.org/standards/RiC/ontology#isOrWasConstituentOf',
      isReversed: false,
      isBidirectional: true,
    };

    const reversed = reverseLink(link);

    expect(reversed.source).toBe('node2');
    expect(reversed.target).toBe('node1');
    expect(reversed.isReversed).toBe(true);
  });
});

describe('Error Handling', () => {
  it('should handle invalid N-Triples gracefully', () => {
    const invalid = 'This is not valid RDF';

    const result = parseNTriples(invalid);

    expect(result.nodes).toHaveLength(0);
    expect(result.links).toHaveLength(0);
  });

  it('should handle malformed triples', () => {
    const malformed = `
<http://example.org/record1> <incomplete triple
<http://example.org/record2> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <https://www.ica.org/standards/RiC/ontology#Record> .
`;

    const result = parseNTriples(malformed);

    // Should parse the valid triple
    expect(result.nodes).toHaveLength(1);
  });
});