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IDENTIFICATION DIVISION.
PROGRAM-ID.  CSISEmailDomain.
* CS4312-99-Exam.
AUTHOR.  Michael Coughlan.

ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
    SELECT CountryFile  ASSIGN TO "COUNTRYCODES.DAT"
           ORGANIZATION IS LINE SEQUENTIAL.

    SELECT GraduateInfoFile ASSIGN TO "GRADINFO.DAT"
           ORGANIZATION IS LINE SEQUENTIAL.

    SELECT WorkFile ASSIGN TO "WORK.TMP".


    SELECT SortedDomainFile ASSIGN TO "SORTEDDOMAIN.DAT"
           ORGANIZATION IS LINE SEQUENTIAL.


DATA DIVISION.
FILE SECTION.
FD CountryFile.
01 CountryRec            PIC X(28).
   88 EndOfCountryFile   VALUE HIGH-VALUES.

FD GraduateInfoFile.
01 GradInfoRecGF.
   88 EndOfGradFile      VALUE HIGH-VALUES.
   02 StudentNameGF      PIC X(25).
   02 GradYearGF         PIC 9(4).
   02 CourseCodeGF       PIC 9.
      88 CSISGraduate    VALUE 1 THRU 5.
   02 EmailAddrGF        PIC X(28).
   02 EmailDomainGF      PIC X(20).
   02 CountryCodeGF      PIC XX.

FD SortedDomainFile.
01 GradInfoRecSF.
   02 EmailDomainSF      PIC X(20).
   02 StudentNameSF      PIC X(25).
   02 GradYearSF         PIC 9(4).
   02 CourseNameSF       PIC X(25).
   02 CountryNameSF      PIC X(26).

SD WorkFile.
01 WorkRec.
   88 EndOfWorkFile      VALUE HIGH-VALUES.
   02 StudentNameWF      PIC X(25).
   02 GradYearWF         PIC 9(4).
   02 CourseCodeWF       PIC 9.
   02 EmailDomainWF      PIC X(20).
   02 CountryCodeWF      PIC XX.

WORKING-STORAGE SECTION.
01 CourseTable.
   02 CourseValues.
      03 FILLER          PIC X(25) VALUE "Computer Systems".
      03 FILLER          PIC X(25) VALUE "Grad. Dip. Computing".
      03 FILLER          PIC X(25) VALUE "Grad. Dip. Localisation".
      03 FILLER          PIC X(25) VALUE "Grad. Dip. Music".
      03 FILLER          PIC X(25) VALUE "Computing with French".
   02 FILLER REDEFINES CourseValues.
      03 CourseName      PIC X(25) OCCURS 5 TIMES.


01 CountryTable.
   02 Country OCCURS 243 TIMES INDEXED BY Cidx.
      03 CountryCode    PIC XX.
      03 CountryName    PIC X(26).


PROCEDURE DIVISION.
Begin.
   SORT WorkFile ON ASCENDING KEY EmailDomainWF
        INPUT PROCEDURE  IS SelectCSISGraduates
        OUTPUT PROCEDURE IS MakeEmailDomainFile.
   STOP RUN.


SelectCSISGraduates.
    OPEN INPUT GraduateInfoFile
    READ GraduateInfoFile
       AT END SET EndOfGradFile TO TRUE
    END-READ
    PERFORM UNTIL EndOfGradFile
       IF CSISGraduate
          MOVE StudentNameGF TO StudentNameWF
          MOVE GradYearGF    TO GradYearWF
          MOVE CourseCodeGF  TO CourseCodeWF
          MOVE EmailDomainGF TO EmailDomainWF
          MOVE CountryCodeGF TO CountryCodeWF
          RELEASE WorkRec
       ELSE
          DISPLAY "Rejected - " StudentNameGF SPACE CourseCodeGF
       END-IF
       READ GraduateInfoFile
         AT END SET EndOfGradFile TO TRUE
       END-READ
    END-PERFORM
    CLOSE GraduateInfoFile.


MakeEmailDomainFile.
    PERFORM LoadCountryTable.
    OPEN OUTPUT SortedDomainFile
    RETURN WorkFile
       AT END SET EndOfWorkFile TO TRUE
    END-RETURN
    PERFORM UNTIL EndOfWorkFile
          MOVE StudentNameWF TO StudentNameSF
          MOVE GradYearWF    TO GradYearSF
          MOVE CourseName(CourseCodeWF) TO CourseNameSF
          MOVE EmailDomainWF TO EmailDomainSF
          SET Cidx TO 1
          SEARCH Country
             AT END MOVE "Code not found" TO CountryNameSF
             WHEN CountryCode(Cidx) = CountryCodeWF
                  MOVE CountryName(Cidx) TO CountryNameSF
          END-SEARCH
          WRITE GradInfoRecSF
          RETURN WorkFile
             AT END SET EndOfWorkFile TO TRUE
          END-RETURN  
    END-PERFORM
    CLOSE SortedDomainFile.

LoadCountryTable.
    OPEN INPUT CountryFile
    READ CountryFile
         AT END SET EndOfCountryFile TO TRUE
    END-READ
    PERFORM VARYING Cidx FROM 1 BY 1 UNTIL EndOfCountryFile
        MOVE CountryRec TO Country(Cidx)
        READ CountryFile
           AT END SET EndOfCountryFile TO TRUE
        END-READ
    END-PERFORM.
    CLOSE CountryFile.