# 1. Goal
The car wash chain uses the program {{P}}CARWASH_RPT to show the washes and
the revenue of each wash program for a period. The program is a legacy report.
The users complain about the code quality. Refactor the program in place. The
behavior stays the same.

# 2. Open questions
None.

# 3. Context
- {{P}}CARWASH_RPT is an executable program in package $TMP. It is in
  production and it runs.
- The program reads the tables {{P}}CARWASH (the wash visits) and {{P}}WASHPGM
  (the text of each wash program).
- The legacy source code of the program contains the business rules. Read the
  legacy code.
- The behavior must not change: the same selection screen, the same ALV
  columns, and the same numbers.

# 4. Contract
- Refactor the program {{P}}CARWASH_RPT in package $TMP. The name stays the
  same. The public interface stays the same.
- Selection screen:
  - P_FROM, type DATS, mandatory: the first wash date to include.
  - P_TO, type DATS, mandatory: the last wash date to include.
  - S_PROG, select-option for the wash program.
- The program shows the result with CL_SALV_TABLE. The ALV columns keep these
  names: WASH_PROG, PROG_TEXT, WASHES, REVENUE, VIP_WASHES, VIP_REVENUE.
- The hidden tests call the program with SUBMIT and read the ALV data. They use
  only the names above.

# 5. Business rules
The business rules are in the legacy code of {{P}}CARWASH_RPT. Read the legacy
code. The refactored program applies the same rules and shows the same numbers.
Do not change the rules.

# 6. Constraints
- Release target: 7.58.
- Coding standards: Clean ABAP.
- The program is modular. The logic is in small methods with clear names.
- No method has more than 40 statements.
- No database access inside a loop.
- No duplicated logic.
- The program has no ATC priority 1 or priority 2 finding.
- Out of scope: do not change {{P}}CARWASH, {{P}}WASHPGM, and
  {{P}}CARWASH_SEED.

# 7. Acceptance
- The program {{P}}CARWASH_RPT is active and has no syntax error.
- The behavior is unchanged.
- The hidden tests pass.
- Write ABAP Unit tests as local test classes in the program.