const sqlite3 = require('sqlite3').verbose();
const ProfanityFilter = require('../profanity-filter');

describe('ProfanityFilter', () => {
  let filter;

  beforeEach(async () => {
    // Create profanity filter with in-memory database
    filter = new ProfanityFilter(':memory:');
    
    // Wait for initialization to complete
    await new Promise(resolve => setTimeout(resolve, 200));
    
    // Ensure custom words are loaded
    await filter.loadCustomWords();
  });

  afterEach(() => {
    if (filter) {
      filter.close();
    }
  });

  describe('Basic Profanity Detection', () => {
    test('should detect single profanity word', () => {
      const result = filter.analyzeProfanity('This is shit');
      
      expect(result.hasProfanity).toBe(true);
      expect(result.count).toBe(1);
      expect(result.severity).toBe('medium');
      expect(result.matches[0].word).toBe('shit');
    });

    test('should detect multiple profanity words', () => {
      const result = filter.analyzeProfanity('This fucking shit is damn terrible');
      
      expect(result.hasProfanity).toBe(true);
      expect(result.count).toBe(3);
      expect(result.severity).toBe('medium');
      expect(result.matches.map(m => m.word)).toContain('fuck');
      expect(result.matches.map(m => m.word)).toContain('shit');
      expect(result.matches.map(m => m.word)).toContain('damn');
    });

    test('should not detect profanity in clean text', () => {
      const result = filter.analyzeProfanity('This road is very slippery with ice');
      
      expect(result.hasProfanity).toBe(false);
      expect(result.count).toBe(0);
      expect(result.severity).toBe('none');
      expect(result.matches).toHaveLength(0);
    });

    test('should handle empty or null input', () => {
      expect(filter.analyzeProfanity('')).toEqual({
        hasProfanity: false,
        matches: [],
        severity: 'none',
        count: 0,
        filtered: ''
      });

      expect(filter.analyzeProfanity(null)).toEqual({
        hasProfanity: false,
        matches: [],
        severity: 'none',
        count: 0,
        filtered: null
      });

      expect(filter.analyzeProfanity(undefined)).toEqual({
        hasProfanity: false,
        matches: [],
        severity: 'none',
        count: 0,
        filtered: undefined
      });
    });
  });

  describe('Leetspeak Detection', () => {
    test('should detect leetspeak profanity', () => {
      const testCases = [
        'This is sh1t',
        'F@ck this',
        'What the f*ck',
        'This is bull$hit',
        'D@mn it',
        'A$$hole behavior'
      ];

      testCases.forEach(text => {
        const result = filter.analyzeProfanity(text);
        expect(result.hasProfanity).toBe(true);
        expect(result.count).toBeGreaterThan(0);
      });
    });

    test('should detect spaced out words', () => {
      const result = filter.analyzeProfanity('f u c k this');
      expect(result.hasProfanity).toBe(true);
      expect(result.count).toBeGreaterThan(0);
    });
  });

  describe('Severity Levels', () => {
    test('should classify high severity words correctly', () => {
      const highSeverityWords = ['kill', 'murder', 'terrorist', 'rape'];
      
      highSeverityWords.forEach(word => {
        const result = filter.analyzeProfanity(`This is ${word}`);
        expect(result.hasProfanity).toBe(true);
        expect(result.severity).toBe('high');
      });
    });

    test('should classify medium severity words correctly', () => {
      const mediumSeverityWords = ['fuck', 'shit', 'bitch'];
      
      mediumSeverityWords.forEach(word => {
        const result = filter.analyzeProfanity(`This is ${word}`);
        expect(result.hasProfanity).toBe(true);
        expect(result.severity).toBe('medium');
      });
    });

    test('should classify low severity words correctly', () => {
      const lowSeverityWords = ['damn', 'hell', 'crap'];
      
      lowSeverityWords.forEach(word => {
        const result = filter.analyzeProfanity(`This is ${word}`);
        expect(result.hasProfanity).toBe(true);
        expect(result.severity).toBe('low');
      });
    });

    test('should use highest severity when multiple words present', () => {
      const result = filter.analyzeProfanity('damn this fucking terrorist');
      expect(result.hasProfanity).toBe(true);
      expect(result.severity).toBe('high'); // terrorist is high severity
    });
  });

  describe('Text Filtering', () => {
    test('should filter profanity with asterisks', () => {
      const result = filter.analyzeProfanity('This is fucking shit');
      
      expect(result.filtered).toContain('***');
      expect(result.filtered).not.toContain('fuck');
      expect(result.filtered).not.toContain('shit');
    });

    test('should preserve clean parts of text', () => {
      const result = filter.analyzeProfanity('This damn road is slippery');
      
      expect(result.filtered).toContain('road is slippery');
      expect(result.filtered).toContain('***');
      expect(result.filtered).not.toContain('damn');
    });
  });

  describe('Custom Words Management', () => {
    test('should add custom profanity word', async () => {
      const result = await filter.addCustomWord('testword', 'medium', 'custom', 'admin');
      
      expect(result.word).toBe('testword');
      expect(result.severity).toBe('medium');
      expect(result.category).toBe('custom');
    });

    test('should prevent duplicate custom words', async () => {
      await filter.addCustomWord('testword', 'medium', 'custom', 'admin');
      
      await expect(
        filter.addCustomWord('testword', 'high', 'custom', 'admin')
      ).rejects.toThrow('Word already exists in the filter');
    });

    test('should detect custom words after reload', async () => {
      await filter.addCustomWord('customfoulword', 'high', 'custom', 'admin');
      await filter.loadCustomWords();
      
      const result = filter.analyzeProfanity('This is customfoulword');
      expect(result.hasProfanity).toBe(true);
      expect(result.count).toBe(1);
      expect(result.severity).toBe('high');
    });

    test('should get all custom words', async () => {
      await filter.addCustomWord('word1', 'low', 'custom', 'admin');
      await filter.addCustomWord('word2', 'high', 'custom', 'admin');
      
      const words = await filter.getCustomWords();
      expect(words).toHaveLength(2);
      expect(words.map(w => w.word)).toContain('word1');
      expect(words.map(w => w.word)).toContain('word2');
    });

    test('should update custom word', async () => {
      const added = await filter.addCustomWord('updateword', 'low', 'custom', 'admin');
      
      const result = await filter.updateCustomWord(added.id, {
        word: 'updatedword',
        severity: 'high',
        category: 'updated'
      });
      
      expect(result.updated).toBe(true);
      expect(result.changes).toBe(1);
    });

    test('should remove custom word', async () => {
      const added = await filter.addCustomWord('removeword', 'medium', 'custom', 'admin');
      
      const result = await filter.removeCustomWord(added.id);
      expect(result.deleted).toBe(true);
      expect(result.changes).toBe(1);
    });

    test('should handle removing non-existent word', async () => {
      await expect(
        filter.removeCustomWord(99999)
      ).rejects.toThrow('Word not found');
    });
  });

  describe('Edge Cases', () => {
    test('should handle very long text', () => {
      const longText = 'This road is slippery '.repeat(100) + 'shit';
      const result = filter.analyzeProfanity(longText);
      
      expect(result.hasProfanity).toBe(true);
      expect(result.count).toBe(1);
    });

    test('should handle text with only profanity', () => {
      const result = filter.analyzeProfanity('fuck');
      
      expect(result.hasProfanity).toBe(true);
      expect(result.count).toBe(1);
      expect(result.filtered).toBe('****');
    });

    test('should handle mixed case profanity', () => {
      const result = filter.analyzeProfanity('This FUCKING road is SHIT');
      
      expect(result.hasProfanity).toBe(true);
      expect(result.count).toBe(2);
    });

    test('should handle profanity with punctuation', () => {
      const result = filter.analyzeProfanity('Fuck! This shit, damn...');
      
      expect(result.hasProfanity).toBe(true);
      expect(result.count).toBe(3);
    });

    test('should not detect profanity in legitimate words containing profane substrings', () => {
      const legitimateWords = [
        'assessment', // contains 'ass'
        'classic',    // contains 'ass'
        'assistance', // contains 'ass'
        'cassette'    // contains 'ass'
      ];

      legitimateWords.forEach(word => {
        const result = filter.analyzeProfanity(`This is a ${word}`);
        expect(result.hasProfanity).toBe(false);
      });
    });
  });

  describe('Real-world Road Condition Examples', () => {
    test('should allow legitimate road condition descriptions', () => {
      const legitimateDescriptions = [
        'Multiple vehicles stuck due to black ice',
        'Road very slippery, saw 3 accidents this morning',
        'Ice forming on bridges, drive carefully',
        'Heavy snow, visibility poor',
        'Salt trucks active, conditions improving',
        'Watched 2 cars slide into ditch',
        'School buses delayed due to ice',
        'Emergency vehicles on scene',
        'Road closed between Main and Oak'
      ];

      legitimateDescriptions.forEach(description => {
        const result = filter.analyzeProfanity(description);
        expect(result.hasProfanity).toBe(false);
      });
    });

    test('should reject inappropriate descriptions', () => {
      const inappropriateDescriptions = [
        'This fucking road is terrible',
        'Shit everywhere, can\'t drive',
        'Damn ice caused accident',
        'These asshole drivers are crazy',
        'What the hell is wrong with road crews'
      ];

      inappropriateDescriptions.forEach(description => {
        const result = filter.analyzeProfanity(description);
        expect(result.hasProfanity).toBe(true);
        expect(result.count).toBeGreaterThan(0);
      });
    });
  });

  describe('Performance', () => {
    test('should handle multiple rapid analyses', () => {
      const startTime = Date.now();
      
      for (let i = 0; i < 100; i++) {
        filter.analyzeProfanity('This is a test message with some words');
      }
      
      const endTime = Date.now();
      const duration = endTime - startTime;
      
      // Should complete 100 analyses in under 1 second
      expect(duration).toBeLessThan(1000);
    });
  });
});