// FIXME/TODO: some variables should be scoped, and some other variables
//             combined in an array, with a very specific name, to avoid
//             collisions. The script as a whole should be optimized to
//             take advangage of magic-v3

function|script|MultiQuiz
{
    if((getarraysize(@quiz_answers$[0]) != getarraysize(@quiz_questions$[0])) ||
        (@quiz_answers$[0] == "") || (@quiz_questions$[0] == "")) goto L_ArrayError;
    set @setindex, 1;
    set @index, rand(0,(getarraysize(@quiz_answers$[0]) - 1));
    set @question$, @quiz_questions$[@index];
    mes "\""+ @question$ + "\"";
    next;
    mes "Pick the correct answer.";
    callfunc "Quiz";
    return;

L_ArrayError:
    if(@quiz_answers$[0] == "") debugmes "@quiz_answers$ is empty";
    if(@quiz_questions$[0] == "") debugmes "@quiz_questions$ is empty";
    if(getarraysize(@quiz_answers$[0]) != getarraysize(@quiz_questions$[0])) debugmes "Size of @quiz_answers$ is not equal to size of @quiz_questions$";
    close;
}

function|script|Quiz
{
    if((@choices_nr < 1) || (@choices_nr > 8)) set @choices_nr, 3;
    if(@choices_nr > getarraysize(@quiz_answers$[0])) set @choices_nr, getarraysize(@quiz_answers$[0]);
    if(@quiz_answers$[0] == "") goto L_ArrayError;
    set @success, 0;
    if(@setindex < 1) set @index, @answer;
    set @good, rand(0,(@choices_nr - 1));
    cleararray @choices$, "", getarraysize(@choices$[0]);
    set @loop, 0;
    goto L_Shuffle;

L_Shuffle:
    set @nindex, rand(0,(getarraysize(@quiz_answers$[0]) - 1));
    if(@nindex == @index) goto L_Shuffle; // do not get the good definition
    set @loop2, 0;
    goto L_Search;

L_Search:
    if(@choices$[@loop2] == @quiz_answers$[@nindex]) goto L_Shuffle; // array is already populated with this choice
    if(@loop2 >= (@choices_nr - 1)) goto L_Shuffle2;
    set @loop2, @loop2 + 1;
    goto L_Search;

L_Shuffle2:
    set @choices$[@loop], @quiz_answers$[@nindex];
    if(@loop >= (@choices_nr - 1)) goto L_Answer;
    set @loop, @loop + 1;
    goto L_Shuffle;

L_Answer:
    set @choices$[@good], @quiz_answers$[@index]; // set the good definition
    menu
        @choices$[0], L_Enter,
        @choices$[1], L_Enter,
        @choices$[2], L_Enter,
        @choices$[3], L_Enter,
        @choices$[4], L_Enter,
        @choices$[5], L_Enter,
        @choices$[6], L_Enter,
        @choices$[7], L_Enter;

L_Enter:
    if(@menu != (@good + 1)) goto L_Shift;
    set @success, 1;
    goto L_Shift;

L_Shift:
    if(@shift < @index) set @shift, @index;

    if(@shift == @index) set @quiz_answers$[@index], ""; // do not allow twice the same question

    if((@quiz_questions$[0] != "") && (@shift == @index)) set @quiz_questions$[@index], "";
    if((@quiz_questions$[0] != "") && (@quiz_questions$[(@shift + 1)] != "")) set @quiz_questions$[@shift], @quiz_questions$[(@shift + 1)];
    if((@quiz_questions$[0] != "") && (@quiz_questions$[(@shift + 1)] != "")) set @quiz_questions$[(@shift + 1)], "";

    if(@quiz_answers$[(@shift + 1)] != "") set @quiz_answers$[@shift], @quiz_answers$[(@shift + 1)];
    if(@quiz_answers$[(@shift + 1)] != "") set @quiz_answers$[(@shift + 1)], "";

    set @shift, @shift + 1;
    if(@quiz_answers$[(@shift + 1)] != "") goto L_Shift;
    set @shift, 0;
    goto L_Close;

L_Close:
    set @answer, 0;
    return;

L_ArrayError:
    if(@quiz_answers$[0] == "") debugmes "@quiz_answers$ is empty";
    mapexit;
}