using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// ******************************************************************
// See: https://gamedev.stackexchange.com/questions/166759/trying-to-load-json-questions-and-answers-into-a-multiple-choice-quiz-game-in-u
[System.Serializable]
public class QuestionCollection
{
    public QuestionChoicesAnswerHintExplanation[] questions;
}
// ******************************************************************


[System.Serializable]
public class QuestionChoicesAnswerHintExplanation : MonoBehaviour {

    public string[] question; // An array of strings (rather than just a string) so that line spacing, which doesn't play well with .json, could be preserved
    public string[] answerChoices;
    public int correctAnswerIndex;
    public string hint;
    public string explanation;

}

public QuestionCollection questionCollection; // See: https://gamedev.stackexchange.com/questions/166759/trying-to-load-json-questions-and-answers-into-a-multiple-choice-quiz-game-in-u

    public QuestionChoicesAnswerHintExplanation[] questions; // This is the fixed size array of the questions, answer choices, answers, hints, and explanations.
    private static List<QuestionChoicesAnswerHintExplanation> questionsCopy; // This is the resizeable list (originally a copy of the array). The size of this list will diminish as we remove items after presenting each question.
    private QuestionChoicesAnswerHintExplanation currentQuestion; // The current question drawn at random.
    private int randomIndex; // the index used to pick the random question.

    string path; // The path to the .json file storing the questions, answer choices, correct answer index, hints, explanations.
    string jsonString; // The contents of the .json file.

path = Application.streamingAssetsPath + "/questionsAndAnswers.json";
    jsonString = File.ReadAllText(path);

    questionCollection = JsonUtility.FromJson<QuestionCollection>(jsonString); // questionCollection contains an array of question-answer choices-answer-hint-explanation objects
    questions = questionCollection.questions;


    //questions = JsonUtility.FromJson<QuestionChoicesAnswerExplanation[]>(jsonString);

    Debug.LogWarning("questionCollection:");
    Debug.LogWarning(questionCollection);

    Debug.LogWarning("Questions:");
    Debug.LogWarning(questions);

    if (questionsCopy == null || questionsCopy.Count == 0) // A list with zero elements isn't always null.
    {
        questionsCopy = questions.ToList<QuestionChoicesAnswerExplanation>();

        Debug.LogWarning("questionsCopy:");
        Debug.LogWarning(questionsCopy);
        Debug.LogWarning("questionsCopy.Count:");
        Debug.LogWarning(questionsCopy.Count);
        Debug.LogWarning("questionsCopy[0]:");
        Debug.LogWarning(questionsCopy[0]);
        Debug.LogWarning("questionsCopy[1]:");
        Debug.LogWarning(questionsCopy[1]);
        Debug.LogWarning("questionsCopy[2]:");
        Debug.LogWarning(questionsCopy[2]);

    }

    PickRandomQuestion();

public void PickRandomQuestion()
{
    randomIndex = Random.Range(0, questionsCopy.Count);
    currentQuestion = questionsCopy[randomIndex];
    questionsCopy.RemoveAt(randomIndex);
}

{
"questions":

[

 {
 "question": ["Trinculo admits 'I have been in such a pickle...' in this comedy:"],
 "answerChoices": ["'The Tempest'", "'Henry 4, Part 1'", "'Henry 5'", "'The Merry Wives of Windsor'"],
 "correctAnswerIndex": 0,
 "explanation": "'Henry 4, Part 1,' and 'Henry 5, are both histories. To be in 'a pickle' usually means to be in a quandary. A broader view of this passage reveals Trinculo to be drunk: nnAlonso: nAnd Trinculo is reeling ripe: where should they nFind this grand liquor that hath gilded 'em? nHow camest thou in this pickle? nnTrinculo: nI have been in such a pickle since I nsaw you last that, I fear me, will never out of nmy bones: I shall not fear fly-blowing.' nn'The Tempest' 5.1."
 },
 {
 "question": ["In 'Hamlet,' this character remarks: 'Neither a borrower nor a lender be; nFor loan oft loses both itself and friend, nAnd borrowing dulls the edge of husbandry. nThis above all: to thine own self be true,nAnd it must follow, as the night the day,nThou canst not then be false to any man:'"],
 "answerChoices": ["Fortinbras", "Gertrude", "Polonius", "The Ghost of Hamlet's Father"],
 "correctAnswerIndex": 2,
 "explanation": "The verbose Polonius is speaking to his son Laertes. 'Hamlet' 1.3."
 },
 {
 "question": ["Roger Daltrey, well into his career with The Who, played the roles for both Dromios, the twin servants, in a 1983 BBC production of:"],
 "answerChoices": ["'King John'", "'King Lear'", "'Coriolanus'", "'The Comedy of Errors'"],
 "correctAnswerIndex": 3,
 "explanation": "'The Comedy of Errors.'"
 }

 ]
}