# 1. Goal
Calculate the toll that a vehicle pays for one journey on a toll road. A billing
program calls the calculation for each journey. The program needs the toll in
cents and one reason code for each journey.

# 2. Open questions
None.

# 3. Context
- The interface {{P}}IF_TOLL_PRICER exists in package $TMP. It is active.
- The interface contains the type TY_JOURNEY for the input, the type TY_RESULT
  for the output, the constant structure C_CLASS with the vehicle classes, the
  constant structure C_REASON with the reason codes, and one method:
  PRICE_JOURNEY IMPORTING is_journey TYPE ty_journey
                RETURNING VALUE(rs_result) TYPE ty_result.

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

# 5. Business rules
Apply the rules in this sequence. All amounts are in cents. Use integer
arithmetic and discard remainders.
1. Convert the vehicle class to upper case. The valid classes are M
   (motorcycle), C (car), V (van) and L (lorry). If the class is not valid,
   return the reason VEHICLE and the amount 0.
2. The distance must be 1 kilometre or more and 130 kilometres or less. If not,
   return the reason DISTANCE and the amount 0.
3. The rate for each kilometre is 5 cents for M, 10 cents for C, 18 cents for V
   and 30 cents for L. The toll is the distance multiplied by the rate.
4. If the toll is below 100 cents, set the toll to 100 cents.
5. If the vehicle has a transponder, subtract one tenth of the toll from the
   toll. Example: a toll of 1000 cents becomes 900 cents.
6. If the journey is at night and the vehicle class is L, add one quarter of the
   toll to the toll. Example: a toll of 3000 cents becomes 3750 cents.
7. Return the reason OK and the toll in the component amount_cents.

# 6. Constraints
- Release target: 8.16 (SAP_BASIS 816).
- 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_TOLL_PRICER.

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