using System.Collections;
using System.Collections.Generic;
using UnityEngine.EventSystems;
using UnityEngine;
using UnityEngine.UI;

public class UntangleDrop : MonoBehaviour, IDropHandler
{
    public int currentIndex;
    private Text thisTxt;
    private string toAdd, current;
    private UntangleQuestion thisQ;
    private Coroutine running = null;
    public static UntangleDrop instance;

    private void Awake()
    {
        instance = this;
    }

    public void ReceiveQuestion(UntangleQuestion q)
    {
        if (!thisTxt)
        {
            thisTxt = GetComponent<Text>();
        }
        thisQ = q;
        currentIndex = 0;
        thisTxt.text = "";
    }

    public void SlowAddText()
    {
        if (running == null)
        {
            running = StartCoroutine(AddToText());
        }
        else
        {
            StopCoroutine(running);
            thisTxt.text += current; 
            running = StartCoroutine(AddToText());
        }
        
    }

    IEnumerator AddToText()
    {
        yield return new WaitForEndOfFrame();
        current = toAdd;
        int startN = current.Length;
        thisTxt.text += " ";
        for (int i = 0; i < startN; i++)
        {
            thisTxt.text += current[0];
            current = current.Remove(0,1);
            
            yield return new WaitForSeconds(.1f);
        }
        A10D1AudioSystem.instance.Tomare();
        running = null;
        yield return null;
    }

    public bool TestAnswer(UntangleDrag answer)
    {
        
        if (answer.thisAnswer.order == currentIndex)
        {
            A10D1AudioSystem.instance.Custom(true);
            answer.isAnswered = true;
            toAdd = answer.thisAnswer.answer;
            CorrectAnswer();
            return true;
        }
        else
        {
            A10D1AudioSystem.instance.Wrong();
            return false;
        }
    }

    public void OnDrop(PointerEventData data)
    {
        if (data.pointerDrag.GetComponent<UntangleDrag>())
        {
            UntangleDrag received = data.pointerDrag.GetComponent<UntangleDrag>();
            if (received.thisAnswer.order == currentIndex)
            {
                A10D1AudioSystem.instance.Custom(true);
                received.isAnswered = true;
                toAdd = received.thisAnswer.answer;
                CorrectAnswer();
            }
            else
            {
                A10D1AudioSystem.instance.Wrong();
            }
        }
    }

    public void CorrectAnswer()
    {
        currentIndex++;
        SlowAddText();
        if(currentIndex == thisQ.answers.Count)
        {
            StartCoroutine(WaitToRelayCA());
        }
    }

    IEnumerator WaitToRelayCA()
    {
        yield return new WaitForSeconds(2);
        UntangleManager.instance.NextQuestion();
    }
}