# 1. Goal
A cinema multiplex prices ticket orders. The checkout program calls one class
for each order. The class calculates the total price of the order and returns a
reason code.

# 2. Open questions
None.

# 3. Context
- The interface {{P}}IF_CINEMA_PRICE exists in package $TMP. It is active.
- The interface contains the exact signature of the calculation, the result
  structure and the reason codes. Read the interface before you start.

# 4. Contract
- Create the class {{P}}CINEMA_PRICER in package $TMP.
- The class is public and final. It has a public constructor without parameters.
- The class implements {{P}}IF_CINEMA_PRICE.
- Do not add other public methods.

# 5. Business rules
The caller gives five values: the screen category, the visitor category, the
number of tickets, the hour when the show starts, and the loyalty card flag.
The calculation returns the total price and a reason code.

Screen categories and the base price of one ticket:
- S (standard): 9.50
- T (three-dimensional): 12.00
- L (large format): 15.00

Visitor categories and the discount on the base price:
- A (adult): 0 percent
- C (child): 30 percent
- S (senior): 40 percent

Check the input in this sequence. Stop at the first invalid value. Return a
price of zero and the reason of this value.
1. The screen category must be S, T or L. Else return the reason SCREEN.
2. The visitor category must be A, C or S. Else return the reason VISITOR.
3. The number of tickets must be 1 to 20. Else return the reason QUANTITY.
4. The hour must be 0 to 23. Else return the reason HOUR.

Calculate the price in this sequence:
5. Take the base price of the screen category.
6. Reduce the price of one ticket by the visitor discount.
7. If the hour is 20 or later, add a late-show surcharge of 1.50 to the price
   of one ticket.
8. Multiply the price of one ticket by the number of tickets.
9. If the number of tickets is 6 or more, reduce the total by 10 percent.
10. If the loyalty card flag is true, reduce the total by 5 percent.
11. Round the total to two decimal places.
12. Return the total and the reason OK.

# 6. Constraints
- Release target: 8.16.
- Coding standards: Clean ABAP. Method length below 40 statements. No global
  variables. No comment that restates the code.
- Out of scope: do not change {{P}}IF_CINEMA_PRICE.

# 7. Acceptance
- The class is active and has no syntax error.
- The hidden tests pass.
- Write your own ABAP Unit tests for the class.