REPORT {{p}}charge_stat.

PARAMETERS p_from TYPE d OBLIGATORY.
PARAMETERS p_to   TYPE d OBLIGATORY.

CLASS lcl_report DEFINITION FINAL.
  PUBLIC SECTION.
    TYPES:
      BEGIN OF ty_line,
        station   TYPE {{p}}charge-station,
        total_kwh TYPE {{p}}charge-energy_kwh,
        sessions  TYPE i,
      END OF ty_line,
      tt_line TYPE STANDARD TABLE OF ty_line WITH EMPTY KEY.
    METHODS select_totals
      IMPORTING iv_from         TYPE d
                iv_to           TYPE d
      RETURNING VALUE(rt_lines) TYPE tt_line.
    METHODS display
      CHANGING ct_lines TYPE tt_line.
ENDCLASS.

CLASS lcl_report IMPLEMENTATION.
  METHOD select_totals.
    SELECT station, SUM( energy_kwh ) AS total_kwh, COUNT( * ) AS sessions
      FROM {{p}}charge
      WHERE session_date >= @iv_from
        AND session_date <= @iv_to
      GROUP BY station
      ORDER BY total_kwh DESCENDING
      INTO CORRESPONDING FIELDS OF TABLE @rt_lines.
  ENDMETHOD.

  METHOD display.
    TRY.
        cl_salv_table=>factory( IMPORTING r_salv_table = DATA(lo_alv)
                                CHANGING  t_table      = ct_lines ).
        lo_alv->display( ).
      CATCH cx_salv_msg INTO DATA(lx_error).
        MESSAGE lx_error TYPE 'I' DISPLAY LIKE 'E'.
    ENDTRY.
  ENDMETHOD.
ENDCLASS.

START-OF-SELECTION.
  DATA(go_report) = NEW lcl_report( ).
  DATA(gt_lines) = go_report->select_totals( iv_from = p_from iv_to = p_to ).
  go_report->display( CHANGING ct_lines = gt_lines ).

CLASS ltc_report DEFINITION FINAL FOR TESTING DURATION SHORT RISK LEVEL HARMLESS.
  PRIVATE SECTION.
    CLASS-DATA go_env TYPE REF TO if_osql_test_environment.
    CLASS-METHODS class_setup.
    CLASS-METHODS class_teardown.
    METHODS totals_per_station FOR TESTING.
    METHODS date_filter FOR TESTING.
ENDCLASS.

CLASS ltc_report IMPLEMENTATION.
  METHOD class_setup.
    go_env = cl_osql_test_environment=>create( i_dependency_list = VALUE #( ( '{{P}}CHARGE' ) ) ).
    DATA lt_charge TYPE STANDARD TABLE OF {{p}}charge WITH EMPTY KEY.
    lt_charge = VALUE #( ( session_id = 1 station = 'A' session_date = '20260101' energy_kwh = 10 )
                         ( session_id = 2 station = 'A' session_date = '20260102' energy_kwh = 5 )
                         ( session_id = 3 station = 'B' session_date = '20260101' energy_kwh = 40 ) ).
    go_env->insert_test_data( lt_charge ).
  ENDMETHOD.

  METHOD class_teardown.
    go_env->destroy( ).
  ENDMETHOD.

  METHOD totals_per_station.
    DATA(lt_lines) = NEW lcl_report( )->select_totals( iv_from = '20260101' iv_to = '20261231' ).
    cl_abap_unit_assert=>assert_equals( exp = 2 act = lines( lt_lines ) ).
    cl_abap_unit_assert=>assert_equals( exp = 'B' act = lt_lines[ 1 ]-station ).
    cl_abap_unit_assert=>assert_equals( exp = 2 act = lt_lines[ 2 ]-sessions ).
  ENDMETHOD.

  METHOD date_filter.
    DATA(lt_lines) = NEW lcl_report( )->select_totals( iv_from = '20260102' iv_to = '20261231' ).
    cl_abap_unit_assert=>assert_equals( exp = 1 act = lines( lt_lines ) ).
    cl_abap_unit_assert=>assert_equals( exp = CONV {{p}}charge-energy_kwh( 5 ) act = lt_lines[ 1 ]-total_kwh ).
  ENDMETHOD.
ENDCLASS.