using System;
using System.Collections.Generic;
using GameOff.Quiz;
using UnityEngine;
using Random = System.Random;

namespace GameOff.Core
{
    [DefaultExecutionOrder(-60)]
    public class QuizHandler : MonoBehaviour
    {
        public static QuizHandler Instance { get; private set; }

        [SerializeField] private int questionAmount = 20;
        [SerializeField] private List<Sprite> questionVisual;
        [SerializeField] private int seed;
        [SerializeField] private bool randomGeneration;
        [SerializeField] private string[] correctAnswer;
            
        private readonly List<string> ChoicePossibles = new List<string>() { "a", "b", "c", "d", "e", "f" };

        private Random _random;
        private List<QuestionInfo> _questionInfos;
        
        private void Awake()
        {
            if (Instance)
            {
                Debug.LogError($"QuizManager already exist! {transform}");
                Destroy(gameObject);
                return;
            }

            Instance = this;
        }

        private void Start()
        {
            if (randomGeneration)
                seed = UnityEngine.Random.Range(0, Int32.MaxValue);
            _random = new Random(seed);

            GenerateQuiz();
        }

        private void GenerateQuiz()
        {
            _questionInfos = new List<QuestionInfo>();
            correctAnswer = new string[questionAmount];
            
            for (int i = 0; i < questionAmount; i++)
            {
                int amount = _random.Next(2, ChoicePossibles.Count);
                string answer = ChoicePossibles[_random.Next(amount)];
                List<string> tmp = new List<string>();

                for (int x = 0; x < amount; x++)
                    tmp.Add(ChoicePossibles[x]);
                
                _questionInfos.Add(new QuestionInfo(i + 1, questionVisual[_random.Next(questionVisual.Count)], tmp, answer));
                correctAnswer[i] = tmp[_random.Next(amount)];
            }
        }

        public string GetAnswerAtIndex(int index) => correctAnswer[index];
        
        public List<QuestionInfo> QuestionInfos => _questionInfos;
        public int QuestionAmount => questionAmount;
    }
}