# 1. Goal

A fishing cooperative auctions the catch of its boats. Each boat reports its catch
as a list of entries. The auctioneer needs one consolidated list for each species.
A program calls the class before it prints the auction list.

# 2. Open questions

None.

# 3. Context

- Package $TMP.
- The class is new. No other object exists for this task.

# 4. Contract

Create the class {{P}}FISH_AUCTION in package $TMP.

- The class is public and final.
- The class has a public constructor without parameters.
- Public types:
  - TY_SPECIES: character, length 10.
  - TY_BOAT_ID: character, length 10.
  - TY_CATCH: structure with the components BOAT_ID (type ty_boat_id),
    SPECIES (type ty_species), and WEIGHT_KG (type i).
  - TT_CATCH: table type of ty_catch. The table can hold more than one entry
    with the same boat ID and the same species.
  - TY_SUMMARY: structure with the components SPECIES (type ty_species),
    TOTAL_WEIGHT (type i), and BOAT_COUNT (type i).
  - TT_SUMMARY: table type of ty_summary.
- Public methods:
  - SUMMARIZE, importing IT_CATCH type tt_catch, returning VALUE(RT_SUMMARY)
    type tt_summary.
  - BEST_SPECIES, importing IT_CATCH type tt_catch, returning VALUE(RV_SPECIES)
    type ty_species.
- Do not add other public methods.

# 5. Business rules

SUMMARIZE:

1. Do not change the input table.
2. For each entry, build the species key: remove the leading and the trailing
   blanks from SPECIES and convert all letters to upper case.
3. Ignore the entry if the species key is empty. Ignore the entry if WEIGHT_KG
   is zero or less.
4. Group the remaining entries by the species key.
5. TOTAL_WEIGHT of a group is the sum of WEIGHT_KG of all entries in the group.
6. BOAT_COUNT of a group is the number of different boat IDs in the group.
7. The result has one row for each group. The rows are in ascending order of the
   species key.
8. If no entry remains, the result is empty.

BEST_SPECIES:

9. Build the groups with the rules 1 to 8.
10. Return the species key of the group with the highest TOTAL_WEIGHT.
11. If two groups have the same highest TOTAL_WEIGHT, return the species key that
    is first in ascending order.
12. If there is no group, return an empty value.

# 6. Constraints

- Release target: ABAP Platform 2025 (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 create or change other objects.

# 7. Acceptance

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