// File: backend/tests/e2e/ocr-prompt-management.e2e-spec.ts
// Change Log
// - 2026-06-18: Created E2E-like tests for OCR & AI Extraction Prompt Management (Feature 238)
// - Note: Full E2E tests require running database and full infrastructure setup
//         Run with: pnpm test:e2e (separate test config with test database)

/**
 * E2E-like tests for OCR & AI Extraction Prompt Management
 * Tests the 3-step pipeline (OCR → AI Extract → RAG Prep) with vector preview
 * Following simplified E2E pattern from rfa-workflow.e2e-spec.ts
 */

describe('OCR & AI Extraction Prompt Management (E2E)', () => {
  const validOcrSystemPrompt =
    'Extract all text from this PDF page accurately.';
  const validOcrExtractionPrompt = 'Extract metadata from: {{ocr_text}}';
  const validRagPrepPrompt = 'Chunk this text: {{text}}';

  describe('T047: OCR Prompt Workflow', () => {
    it('should validate OCR system prompt template (no placeholders required)', () => {
      // OCR system prompt is free-form, no validation required
      expect(validOcrSystemPrompt).toBeTruthy();
      expect(validOcrSystemPrompt.length).toBeGreaterThan(0);
    });

    it('should validate OCR extraction prompt requires {{ocr_text}} placeholder', () => {
      const invalidPrompt = 'Extract metadata from text';
      const validPrompt = 'Extract metadata from: {{ocr_text}}';

      expect(invalidPrompt.includes('{{ocr_text}}')).toBe(false);
      expect(validPrompt.includes('{{ocr_text}}')).toBe(true);
    });

    it('should validate RAG prep prompt requires {{text}} placeholder', () => {
      const invalidPrompt = 'Chunk this text';
      const validPrompt = 'Chunk this text: {{text}}';

      expect(invalidPrompt.includes('{{text}}')).toBe(false);
      expect(validPrompt.includes('{{text}}')).toBe(true);
    });

    it('should enforce 4,000 character limit for templates', () => {
      const longTemplate = 'a'.repeat(4001);
      const validTemplate = 'a'.repeat(4000);

      expect(longTemplate.length).toBeGreaterThan(4000);
      expect(validTemplate.length).toBe(4000);
    });
  });

  describe('T066: Full 3-Step Pipeline', () => {
    it('should verify sequential step execution flow', () => {
      // Simulate step states
      const steps = [
        { step: 1, name: 'OCR', status: 'completed' },
        { step: 2, name: 'AI Extract', status: 'pending' },
        { step: 3, name: 'RAG Prep', status: 'pending' },
      ];

      // Step 1 completed enables Step 2
      expect(steps[0].status).toBe('completed');
      expect(steps[1].status).toBe('pending');

      // Step 2 completed enables Step 3
      steps[1].status = 'completed';
      expect(steps[2].status).toBe('pending');
    });

    it('should verify OCR text flows to AI Extract', () => {
      const ocrText = 'Sample OCR text from PDF';
      const extractionPrompt = validOcrExtractionPrompt.replace(
        '{{ocr_text}}',
        ocrText
      );

      expect(extractionPrompt).toContain(ocrText);
      expect(extractionPrompt).not.toContain('{{ocr_text}}');
    });

    it('should verify extracted text flows to RAG Prep', () => {
      const extractedText = 'Sample extracted metadata text';
      const ragPrepPrompt = validRagPrepPrompt.replace(
        '{{text}}',
        extractedText
      );

      expect(ragPrepPrompt).toContain(extractedText);
      expect(ragPrepPrompt).not.toContain('{{text}}');
    });
  });

  describe('T067: Vector Preview Display', () => {
    it('should display vector with first 5 dimensions', () => {
      const mockVector = Array.from({ length: 768 }, () => Math.random());
      const first5Dims = mockVector.slice(0, 5);

      expect(first5Dims).toHaveLength(5);
      expect(first5Dims.every((v) => typeof v === 'number')).toBe(true);
    });

    it('should format vector display correctly', () => {
      const mockVector = [0.234, -0.891, 0.456, 0.123, -0.567];
      const formatted = mockVector.map((v) => v.toFixed(3)).join(', ');

      expect(formatted).toBe('0.234, -0.891, 0.456, 0.123, -0.567');
    });

    it('should handle empty vector gracefully', () => {
      const emptyVector: number[] = [];
      const first5Dims = emptyVector.slice(0, 5);

      expect(first5Dims).toHaveLength(0);
    });
  });

  describe('T068: Step Indicators', () => {
    it('should show correct status for each step', () => {
      const stepStatuses = ['pending', 'processing', 'completed', 'failed'];

      stepStatuses.forEach((status) => {
        expect(['pending', 'processing', 'completed', 'failed']).toContain(
          status
        );
      });
    });

    it('should disable next steps until previous completes', () => {
      const currentStep = 1;
      const step2Enabled = currentStep >= 2;
      const step3Enabled = currentStep >= 3;

      expect(step2Enabled).toBe(false);
      expect(step3Enabled).toBe(false);
    });

    it('should enable next steps after completion', () => {
      const currentStep = 2;
      const step2Enabled = currentStep >= 2;
      const step3Enabled = currentStep >= 3;

      expect(step2Enabled).toBe(true);
      expect(step3Enabled).toBe(false);
    });
  });

  describe('Optimistic Locking (T046)', () => {
    it('should detect version mismatch', () => {
      const expectedVersion = 3;
      const currentVersion = 5;

      const isMismatch = expectedVersion !== currentVersion;

      expect(isMismatch).toBe(true);
    });

    it('should allow activation when versions match', () => {
      const expectedVersion = 5;
      const currentVersion = 5;

      const isMismatch = expectedVersion !== currentVersion;

      expect(isMismatch).toBe(false);
    });
  });

  describe('UUID Compliance (ADR-019)', () => {
    it('should validate prompt publicId format', () => {
      const validPublicId = '019505a1-7c3e-7000-8000-abc123def456';
      const uuidRegex =
        /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;

      expect(validPublicId).toMatch(uuidRegex);
    });

    it('should reject invalid UUID format', () => {
      const invalidIds = [
        'not-a-uuid',
        '12345',
        '019505a1-7c3e-7000-8000', // Missing last segment
        '550e8400-e29b-41d4-a716', // Missing last segment
      ];

      const uuidRegex =
        /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;

      invalidIds.forEach((id) => {
        expect(id).not.toMatch(uuidRegex);
      });
    });
  });
});
