// Unit tests for transcript fetcher
import { describe, it, expect, beforeEach, afterEach, jest } from '@jest/globals';
import fetch from 'node-fetch';
import { 
  fetchTranscriptContent, 
  isValidTranscriptUrl, 
  extractSessionIdFromTranscript 
} from '../../lib/transcriptFetcher';

// Mock node-fetch
const mockFetch = fetch as jest.MockedFunction<typeof fetch>;

describe('Transcript Fetcher', () => {
  beforeEach(() => {
    jest.clearAllMocks();
  });

  describe('fetchTranscriptContent', () => {
    it('should successfully fetch transcript content', async () => {
      const mockResponse = {
        ok: true,
        text: jest.fn().mockResolvedValue('Session transcript content'),
      };
      mockFetch.mockResolvedValue(mockResponse as any);

      const result = await fetchTranscriptContent('https://example.com/transcript');

      expect(result.success).toBe(true);
      expect(result.content).toBe('Session transcript content');
      expect(result.error).toBeUndefined();
      expect(mockFetch).toHaveBeenCalledWith('https://example.com/transcript', {
        method: 'GET',
        headers: {
          'User-Agent': 'LiveDash-Transcript-Fetcher/1.0',
        },
        signal: expect.any(AbortSignal),
      });
    });

    it('should handle authentication with username and password', async () => {
      const mockResponse = {
        ok: true,
        text: jest.fn().mockResolvedValue('Authenticated transcript'),
      };
      mockFetch.mockResolvedValue(mockResponse as any);

      const result = await fetchTranscriptContent(
        'https://example.com/transcript',
        'user123',
        'pass456'
      );

      expect(result.success).toBe(true);
      expect(result.content).toBe('Authenticated transcript');
      
      const expectedAuth = 'Basic ' + Buffer.from('user123:pass456').toString('base64');
      expect(mockFetch).toHaveBeenCalledWith('https://example.com/transcript', {
        method: 'GET',
        headers: {
          'User-Agent': 'LiveDash-Transcript-Fetcher/1.0',
          'Authorization': expectedAuth,
        },
        signal: expect.any(AbortSignal),
      });
    });

    it('should handle HTTP errors', async () => {
      const mockResponse = {
        ok: false,
        status: 404,
        statusText: 'Not Found',
      };
      mockFetch.mockResolvedValue(mockResponse as any);

      const result = await fetchTranscriptContent('https://example.com/transcript');

      expect(result.success).toBe(false);
      expect(result.error).toBe('HTTP 404: Not Found');
      expect(result.content).toBeUndefined();
    });

    it('should handle empty transcript content', async () => {
      const mockResponse = {
        ok: true,
        text: jest.fn().mockResolvedValue('   '),
      };
      mockFetch.mockResolvedValue(mockResponse as any);

      const result = await fetchTranscriptContent('https://example.com/transcript');

      expect(result.success).toBe(false);
      expect(result.error).toBe('Empty transcript content');
      expect(result.content).toBeUndefined();
    });

    it('should handle network errors', async () => {
      mockFetch.mockRejectedValue(new Error('ENOTFOUND example.com'));

      const result = await fetchTranscriptContent('https://example.com/transcript');

      expect(result.success).toBe(false);
      expect(result.error).toBe('Domain not found');
      expect(result.content).toBeUndefined();
    });

    it('should handle connection refused errors', async () => {
      mockFetch.mockRejectedValue(new Error('ECONNREFUSED'));

      const result = await fetchTranscriptContent('https://example.com/transcript');

      expect(result.success).toBe(false);
      expect(result.error).toBe('Connection refused');
      expect(result.content).toBeUndefined();
    });

    it('should handle timeout errors', async () => {
      mockFetch.mockRejectedValue(new Error('Request timeout'));

      const result = await fetchTranscriptContent('https://example.com/transcript');

      expect(result.success).toBe(false);
      expect(result.error).toBe('Request timeout');
      expect(result.content).toBeUndefined();
    });

    it('should handle empty URL', async () => {
      const result = await fetchTranscriptContent('');

      expect(result.success).toBe(false);
      expect(result.error).toBe('No transcript URL provided');
      expect(result.content).toBeUndefined();
      expect(mockFetch).not.toHaveBeenCalled();
    });

    it('should trim whitespace from content', async () => {
      const mockResponse = {
        ok: true,
        text: jest.fn().mockResolvedValue('  \n  Session content  \n  '),
      };
      mockFetch.mockResolvedValue(mockResponse as any);

      const result = await fetchTranscriptContent('https://example.com/transcript');

      expect(result.success).toBe(true);
      expect(result.content).toBe('Session content');
    });
  });

  describe('isValidTranscriptUrl', () => {
    it('should validate HTTP URLs', () => {
      expect(isValidTranscriptUrl('http://example.com/transcript')).toBe(true);
    });

    it('should validate HTTPS URLs', () => {
      expect(isValidTranscriptUrl('https://example.com/transcript')).toBe(true);
    });

    it('should reject invalid URLs', () => {
      expect(isValidTranscriptUrl('not-a-url')).toBe(false);
      expect(isValidTranscriptUrl('ftp://example.com')).toBe(false);
      expect(isValidTranscriptUrl('')).toBe(false);
      expect(isValidTranscriptUrl(null as any)).toBe(false);
      expect(isValidTranscriptUrl(undefined as any)).toBe(false);
    });

    it('should handle malformed URLs', () => {
      expect(isValidTranscriptUrl('http://')).toBe(false);
      expect(isValidTranscriptUrl('https://')).toBe(false);
      expect(isValidTranscriptUrl('://example.com')).toBe(false);
    });
  });

  describe('extractSessionIdFromTranscript', () => {
    it('should extract session ID from session_id pattern', () => {
      const content = 'session_id: abc123def456\nOther content...';
      const result = extractSessionIdFromTranscript(content);
      expect(result).toBe('abc123def456');
    });

    it('should extract session ID from sessionId pattern', () => {
      const content = 'sessionId: xyz789\nTranscript data...';
      const result = extractSessionIdFromTranscript(content);
      expect(result).toBe('xyz789');
    });

    it('should extract session ID from id pattern', () => {
      const content = 'id: session-12345678\nChat log...';
      const result = extractSessionIdFromTranscript(content);
      expect(result).toBe('session-12345678');
    });

    it('should extract session ID from first line', () => {
      const content = 'abc123def456\nUser: Hello\nBot: Hi there';
      const result = extractSessionIdFromTranscript(content);
      expect(result).toBe('abc123def456');
    });

    it('should return null for content without session ID', () => {
      const content = 'User: Hello\nBot: Hi there\nUser: How are you?';
      const result = extractSessionIdFromTranscript(content);
      expect(result).toBe(null);
    });

    it('should return null for empty content', () => {
      expect(extractSessionIdFromTranscript('')).toBe(null);
      expect(extractSessionIdFromTranscript(null as any)).toBe(null);
      expect(extractSessionIdFromTranscript(undefined as any)).toBe(null);
    });

    it('should handle case-insensitive patterns', () => {
      const content = 'SESSION_ID: ABC123\nContent...';
      const result = extractSessionIdFromTranscript(content);
      expect(result).toBe('ABC123');
    });

    it('should extract the first matching pattern', () => {
      const content = 'session_id: first123\nid: second456\nMore content...';
      const result = extractSessionIdFromTranscript(content);
      expect(result).toBe('first123');
    });
  });
});