# 1. Goal

A photo studio prices a photo shoot. A booking program calls the calculation
before it shows the quote to the customer. The program needs the fee parts and
the total fee.

# 2. Open questions

None.

# 3. Context

- The class {{P}}PHOTO_PRICER does not exist. Create it in package $TMP.
- The booking program uses the public types, the public constants and the
  public method of the class. It does not use other parts of the class.

# 4. Contract

- Create the class {{P}}PHOTO_PRICER in package $TMP.
- The class is public and final. It has a public constructor without parameters.
- The class has these public types:
  - ty_session: type c, length 7.
  - ty_reason: type c, length 8.
  - ty_amount: type p, length 8, 2 decimal places.
  - ty_request: a structure with the components session (ty_session),
    minutes (i), persons (i), photos (i) and distance_km (i).
  - ty_quote: a structure with the components time_fee (ty_amount),
    person_fee (ty_amount), photo_fee (ty_amount), travel_fee (ty_amount),
    crew_fee (ty_amount), total (ty_amount) and reason (ty_reason).
- The class has these public constants:
  - c_session with the components studio = 'STUDIO' and outdoor = 'OUTDOOR'.
    Both components have the type ty_session.
  - c_reason with the components ok = 'OK', session = 'SESSION',
    minutes = 'MINUTES', persons = 'PERSONS', photos = 'PHOTOS' and
    distance = 'DISTANCE'. All components have the type ty_reason.
- The class has one public method:
  calculate
    IMPORTING is_request      TYPE ty_request
    RETURNING VALUE(rs_quote) TYPE ty_quote.
- Do not add other public methods.

# 5. Business rules

First check the input. Apply the checks in this sequence. If a check fails, set
rs_quote-reason to the reason of that check, keep all fee components and the
total at 0, and stop.

1. is_request-session must be STUDIO or OUTDOOR. Else reason = SESSION.
2. is_request-minutes must be 30 or more and 480 or less. Else reason = MINUTES.
3. is_request-persons must be 1 or more and 20 or less. Else reason = PERSONS.
4. is_request-photos must be 0 or more and 200 or less. Else reason = PHOTOS.
5. If the session is OUTDOOR, is_request-distance_km must be 1 or more. Else
   reason = DISTANCE. For a STUDIO session, ignore distance_km.

If all checks pass, set reason = OK and calculate the fees.

- time_fee: each started 15 minutes of the shoot costs 20.00. Example: 30
  minutes cost 40.00. 31 minutes cost 60.00. 480 minutes cost 640.00.
- person_fee: the first 2 persons are free. Each other person costs 10.00.
- photo_fee: if photos is less than 50, each photo costs 5.00. If photos is 50
  or more, each photo costs 4.00.
- travel_fee: for a STUDIO session, 0.00. For an OUTDOOR session, 15.00 plus
  2.00 for each kilometre of distance_km.
- crew_fee: if persons is more than 8, the studio sends a second photographer.
  The crew_fee is then 40.00. Else the crew_fee is 0.00.
- total: the sum of time_fee, person_fee, photo_fee, travel_fee and crew_fee.

# 6. Constraints

- Release target: SAP_BASIS 816.
- Coding standards: Clean ABAP. Each method has less than 40 statements. No
  global variables. No comment that restates the code.
- Out of scope: database access, ALV lists, CDS views, function modules,
  reports and dynpros.

# 7. Acceptance

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