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/**
  @file mv_webout.sas
  @brief Send data to/from the SAS Viya Job Execution Service
  @details This macro should be added to the start of each Job Execution
  Service, **immediately** followed by a call to:
 
        %mv_webout(FETCH)
 
    This will read all the input data and create same-named SAS datasets in the
    WORK library.  You can then insert your code, and send data back using the
    following syntax:
 
        data some datasets; * make some data ;
        retain some columns;
        run;
 
        %mv_webout(OPEN)
        %mv_webout(ARR,some)  * Array format, fast, suitable for large tables ;
        %mv_webout(OBJ,datasets) * Object format, easier to work with ;
        %mv_webout(CLOSE)
 
 
  @param action Either OPEN, ARR, OBJ or CLOSE
  @param ds The dataset to send back to the frontend
  @param _webout= fileref for returning the json
  @param fref= temp fref
  @param dslabel= value to use instead of the real name for sending to JSON
  @param fmt= change to N to strip formats from output
 
  <h4> Dependencies </h4>
  @li mp_jsonout.sas
  @li mf_getuser.sas
 
  @version Viya 3.3
  @author Allan Bowe
 
**/
%macro mv_webout(action,ds,fref=_mvwtemp,dslabel=,fmt=Y);
%global _webin_file_count _webin_fileuri _debug _omittextlog _webin_name
  sasjs_tables SYS_JES_JOB_URI;
%if %index("&_debug",log) %then %let _debug=131; 
 
%local i tempds;
%let action=%upcase(&action);
 
%if &action=FETCH %then %do;
  %if %upcase(&_omittextlog)=FALSE or %str(&_debug) ge 131 %then %do;
    options mprint notes mprintnest;
  %end;
 
  %if not %symexist(_webin_fileuri1) %then %do;
    %let _webin_file_count=%eval(&_webin_file_count+0);
    %let _webin_fileuri1=&_webin_fileuri;
    %let _webin_name1=&_webin_name;
  %end;
 
  /* if the sasjs_tables param is passed, we expect param based upload */
  %if %length(&sasjs_tables.XX)>2 %then %do;
    filename _sasjs "%sysfunc(pathname(work))/sasjs.lua";
    data _null_;
      file _sasjs;
      put 's=sas.symget("sasjs_tables")';
      put 'if(s:sub(1,7) == "%nrstr(")';
      put 'then';
      put ' tablist=s:sub(8,s:len()-1)';
      put 'else';
      put ' tablist=s';
      put 'end';
      put 'for i = 1,sas.countw(tablist) ';
      put 'do ';
      put '  tab=sas.scan(tablist,i)';
      put '  sasdata=""';
      put '  if (sas.symexist("sasjs"..i.."data0")==0)';
      put '  then';
      /* TODO - condense this logic */
      put '    s=sas.symget("sasjs"..i.."data")';
      put '    if(s:sub(1,7) == "%nrstr(")';
      put '    then';
      put '      sasdata=s:sub(8,s:len()-1)';
      put '    else';
      put '      sasdata=s';
      put '    end';
      put '  else';
      put '    for d = 1, sas.symget("sasjs"..i.."data0")';
      put '    do';
      put '      s=sas.symget("sasjs"..i.."data"..d)';
      put '      if(s:sub(1,7) == "%nrstr(")';
      put '      then';
      put '        sasdata=sasdata..s:sub(8,s:len()-1)';
      put '      else';
      put '        sasdata=sasdata..s';
      put '      end';
      put '    end';
      put '  end';
      put '  file = io.open(sas.pathname("work").."/"..tab..".csv", "a")';
      put '  io.output(file)';
      put '  io.write(sasdata)';
      put '  io.close(file)';
      put 'end';
    run;
    %inc _sasjs;
 
    /* now read in the data */
    %do i=1 %to %sysfunc(countw(&sasjs_tables));
      %local table; %let table=%scan(&sasjs_tables,&i);
      data _null_;
        infile "%sysfunc(pathname(work))/&table..csv" termstr=crlf ;
        input;
        if _n_=1 then call symputx('input_statement',_infile_);
        list;
      data &table;
        infile "%sysfunc(pathname(work))/&table..csv" firstobs=2 dsd termstr=crlf;
        input &input_statement;
      run;
    %end;
  %end;
  %else %do i=1 %to &_webin_file_count;
    /* read in any files that are sent */
    /* this part needs refactoring for wide files */
    filename indata filesrvc "&&_webin_fileuri&i" lrecl=999999;
    data _null_;
      infile indata termstr=crlf lrecl=32767;
      input;
      if _n_=1 then call symputx('input_statement',_infile_);
      %if %str(&_debug) ge 131 %then %do;
        if _n_<20 then putlog _infile_;
        else stop;
      %end;
      %else %do;
        stop;
      %end;
    run;
    data &&_webin_name&i;
      infile indata firstobs=2 dsd termstr=crlf ;
      input &input_statement;
    run;
    %let sasjs_tables=&sasjs_tables &&_webin_name&i;
  %end;
%end;
%else %if &action=OPEN %then %do;
  /* setup webout */
  OPTIONS NOBOMFILE;
  %if "X&SYS_JES_JOB_URI.X"="XX" %then %do;
     filename _webout temp lrecl=999999 mod;
  %end;
  %else %do;
    filename _webout filesrvc parenturi="&SYS_JES_JOB_URI" 
      name="_webout.json" lrecl=999999 mod; 
  %end;
 
  /* setup temp ref */
  %if %upcase(&fref) ne _WEBOUT %then %do;
    filename &fref temp lrecl=999999 permission='A::u::rwx,A::g::rw-,A::o::---' mod;
  %end;
 
  /* setup json */
  data _null_;file &fref;
    put '{"START_DTTM" : "' "%sysfunc(datetime(),datetime20.3)" '"';
  run;
%end;
%else %if &action=ARR or &action=OBJ %then %do;
    %mp_jsonout(&action,&ds,dslabel=&dslabel,fmt=&fmt
      ,jref=&fref,engine=PROCJSON,dbg=%str(&_debug)
    )
%end;
%else %if &action=CLOSE %then %do;
  %if %str(&_debug) ge 131 %then %do;
    /* send back first 10 records of each work table for debugging */
    options obs=10;
    data;run;%let tempds=%scan(&syslast,2,.);
    ods output Members=&tempds;
    proc datasets library=WORK memtype=data;
    %local wtcnt;%let wtcnt=0;
    data _null_; set &tempds;
      if not (name =:"DATA");
      i+1;
      call symputx('wt'!!left(i),name);
      call symputx('wtcnt',i);
    data _null_; file &fref mod; put ",""WORK"":{";
    %do i=1 %to &wtcnt;
      %let wt=&&wt&i;
      proc contents noprint data=&wt
        out=_data_ (keep=name type length format:);
      run;%let tempds=%scan(&syslast,2,.);
      data _null_; file &fref mod;
        dsid=open("WORK.&wt",'is');
        nlobs=attrn(dsid,'NLOBS');
        nvars=attrn(dsid,'NVARS');
        rc=close(dsid);
        if &i>1 then put ','@;
        put " ""&wt"" : {";
        put '"nlobs":' nlobs;
        put ',"nvars":' nvars;
      %mp_jsonout(OBJ,&tempds,jref=&fref,dslabel=colattrs,engine=DATASTEP)
      %mp_jsonout(OBJ,&wt,jref=&fref,dslabel=first10rows,engine=DATASTEP)
      data _null_; file &fref mod;put "}";
    %end;
    data _null_; file &fref mod;put "}";run;
  %end;
 
  /* close off json */
  data _null_;file &fref mod;
    _PROGRAM=quote(trim(resolve(symget('_PROGRAM'))));
    put ",""SYSUSERID"" : ""&sysuserid"" ";
    put ",""MF_GETUSER"" : ""%mf_getuser()"" ";
    SYS_JES_JOB_URI=quote(trim(resolve(symget('SYS_JES_JOB_URI'))));
    put ',"SYS_JES_JOB_URI" : ' SYS_JES_JOB_URI ;
    put ",""SYSJOBID"" : ""&sysjobid"" ";
    put ",""_DEBUG"" : ""&_debug"" ";
    put ',"_PROGRAM" : ' _PROGRAM ;
    put ",""SYSCC"" : ""&syscc"" ";
    put ",""SYSERRORTEXT"" : ""&syserrortext"" ";
    put ",""SYSHOSTNAME"" : ""&syshostname"" ";
    put ",""SYSSITE"" : ""&syssite"" ";
    put ",""SYSWARNINGTEXT"" : ""&syswarningtext"" ";
    put ',"END_DTTM" : "' "%sysfunc(datetime(),datetime20.3)" '" ';
    put "}";
 
  %if %upcase(&fref) ne _WEBOUT %then %do;
    data _null_; rc=fcopy("&fref","_webout");run;
  %end;
 
%end;
 
%mend;