=== Testing DiscountEngine Calculations (No DB) ===

--- Test 1: Simple Product Discount ---
Price: $100.00
Discount: $25.00
Final: $75.00
✓ PASS

--- Test 2: Product Percentage Discount (20% off) ---
Original: $100.00
Discount: 20%
Amount Off: $20.00
Final: $80.00
✓ PASS

--- Test 3: Category Percentage Discount (15% off) ---
Original: $50.00
Discount: 15%
Amount Off: $7.50
Final: $42.50
✓ PASS

--- Test 4: Storewide Discount (10% off everything) ---
Original: $125.00
Discount: 10%
Amount Off: $12.50
Final: $112.50
✓ PASS

--- Test 5: BOGO Product (Buy 1 Get 1 Free) ---
Unit Price: $30.00
Promotion: Buy 1 Get 1 Free
Effective Discount: 50.00%
Price Per Unit: $15.00
✓ PASS

--- Test 6: BOGO (Buy 2 Get 1 Free) ---
Unit Price: $20.00
Promotion: Buy 2 Get 1 Free
Effective Discount: 33.33%
Price Per Unit: $13.33
✓ PASS

--- Test 7: Bundle Pricing (3 for $10) ---
Regular Price: $5.00 each
Bundle: 3 for $10.00
Bundle Price Per Item: $3.33
Savings: $1.67 per item
Savings: 33.33%
✓ PASS

--- Test 8: Bundle Pricing (5 for $20) ---
Regular Price: $6.00 each
Bundle: 5 for $20.00
Bundle Price Per Item: $4.00
Savings: $2.00 per item
✓ PASS

--- Test 9: Quantity Threshold Discount ---
Unit Price: $40.00
Quantity: 6 (threshold: 5+)
Discount: 20%
Final Price Per Unit: $32.00
✓ PASS

--- Test 10: Best Discount Selection (Multiple Applicable) ---
Original Price: $100.00
Applicable Discounts:
  - Category 15% off: $85.00 (save $15.00)
  - Product 20% off: $80.00 (save $20.00)
  - Store 10% off: $90.00 (save $10.00)

Best Discount Selected: Product 20% off
Final Price: $80.00
✓ PASS

--- Test 11: Negative Price Prevention ---
Price: $10.00
Discount: $15.00
Final Price: $0.00
✓ PASS

--- Test 12: 100% Discount (Free Item) ---
Original: $50.00
Discount: 100%
Final: $0.00
✓ PASS

--- Test 13: Mixed Cart with Various Discounts ---
Widget A: $100 × 2 = $200.00 - $40.00 = $160.00
Widget B: $50 × 1 = $50.00 - $7.50 = $42.50
Widget C: $75 × 3 = $225.00

Subtotal: $475.00
Total Savings: $47.50
Total: $427.50
✓ PASS

=== All Tests Complete ===
✓ All 13 calculation tests passed
✓ DiscountEngine logic validated
✓ Ready for database integration

Discount Types Tested:
  ✓ Simple product discount (fixed amount)
  ✓ Product percentage discount
  ✓ Category percentage discount
  ✓ Storewide percentage discount
  ✓ BOGO (Buy X Get Y Free)
  ✓ Bundle pricing (X for $Y)
  ✓ Quantity threshold discount
  ✓ Best discount selection
  ✓ Negative price prevention
  ✓ Mixed cart calculations

Next Steps:
1. Create sample discount data SQL
2. Test DiscountEngine with real database
3. Integrate into PosController.php
4. Update POS.js to show discount badges