main.mo

import Array "mo:base/Array";

type Question = {
    #yesOrNo: {
        question: Text;
        solution: Bool;
    };
    #freeform: {
        question: Text
    };
};

type Answer = {
    #yesOrNo: Bool;
    #freeform: Text;
};

type Test = [(Question, ?Answer)];

func renderQuestion(question: Question): Text {
    switch (question) {
        case (#yesOrNo(q))
            q.question;
        case (#freeform(q))
            q.question;
    };
};

actor {
    var questions: [Question] = [
        #freeform({ question = "Welches Bier?" }),
        #yesOrNo({ question = "Tabs or Spaces?"; solution =  false })
    ];

    var tests: [(Principal, Test)] = [];

    // public func allQuestions() : async [Text] {
    //     Array.map(questions, renderQuestion)
    // };

    public func allQuestions() : async [Question] {
        questions;
    };

    public func allTests() : async [(Principal, Test)] {
        tests;
    };

    public shared { caller } func createTest(indicies: [Nat]) {
        let test: Test = Array.map<Nat, (Question, ?Answer)>(indicies, func i = (questions[i], null));
        // tests #= [(caller, test)];
        tests := Array.append(tests, [(caller, test)]);
    }
};