# 1. Goal
Calculate the price of a finished car-sharing rental. A booking program calls
one function module for each finished rental. The function module must have
the same interface as the sample function module, because the booking program
calls all pricing modules in the same way.

# 2. Open questions
None.

# 3. Context
- Function group {{P}}FG_RENT exists in package $TMP.
- Function module {{P}}RENT_SAMPLE exists in this function group. It is the
  sample pricing module. Its interface is the interface that all pricing
  modules must use.
- All rental data is in the input parameters. No database access is necessary.

# 4. Contract
Create the function module {{P}}RENT_PRICE in function group {{P}}FG_RENT.
The interface is:

  IMPORTING
    iv_vehicle_class TYPE string
    iv_minutes       TYPE i
    iv_km            TYPE i
    iv_member        TYPE abap_bool
    iv_weekend       TYPE abap_bool
  EXPORTING
    ev_time_fee      TYPE decfloat34
    ev_distance_fee  TYPE decfloat34
    ev_surcharge     TYPE decfloat34
    ev_discount      TYPE decfloat34
    ev_total         TYPE decfloat34
  EXCEPTIONS
    invalid_duration
    invalid_distance
    invalid_class

This interface is the same as the interface of {{P}}RENT_SAMPLE.

Put the calculation logic in a new class in package $TMP. The function module
must only call this class. The function module must not contain the
calculation itself. The class is your own design decision. The function module
maps the result of the class to its exporting parameters and exceptions.

# 5. Business rules
1. Check the input in this sequence:
   a. If iv_minutes is less than 1, raise INVALID_DURATION.
   b. If iv_km is less than 0, raise INVALID_DISTANCE.
   c. If iv_vehicle_class is not 'S', not 'M' and not 'L', raise INVALID_CLASS.
2. Charge the rental duration in started 15-minute blocks. A duration of 15
   minutes is one block. A duration of 16 minutes is two blocks.
3. The price of one block depends on the vehicle class: 'S' costs 3.00, 'M'
   costs 5.00 and 'L' costs 8.00. The time fee is the number of blocks
   multiplied by the block price.
4. The first 10 kilometres of a rental are free. Each further kilometre costs
   0.25. The distance fee is the number of kilometres above 10 multiplied by
   0.25.
5. If iv_weekend is true, the weekend surcharge is 25 % of the time fee.
   Otherwise the weekend surcharge is 0.
6. The gross amount is the time fee plus the distance fee plus the weekend
   surcharge.
7. If iv_member is true, the member discount is 15 % of the gross amount.
   Otherwise the member discount is 0.
8. The total price is the gross amount minus the member discount. If this
   value is less than 5.00, the total price is 5.00.
9. Round the weekend surcharge, the member discount and the total price half
   up to 2 decimals.
10. Return the time fee in ev_time_fee, the distance fee in ev_distance_fee,
    the weekend surcharge in ev_surcharge, the member discount in ev_discount
    and the total price in ev_total.

# 6. Constraints
- Release target: ABAP Platform 2025 (SAP_BASIS 816).
- Coding standards: Clean ABAP. Keep every method below 40 statements.
- Out of scope: do not change {{P}}RENT_SAMPLE.

# 7. Acceptance
- The function module {{P}}RENT_PRICE is active and has no syntax error.
- The hidden tests pass.
- Write ABAP Unit tests for the new class as local test classes.
- Write ABAP Unit tests for the function module in a global test class.