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

public class ScrollViewScript : MonoBehaviour, IDropHandler {
    public GameObject prefab;
    public Transform contentPanel;
    private bool placeQuestion;
    NewQuestion nq;
    private int newQuestionSiblingIndex;
    ModalPanel modalPanel;
    private bool answeredCorrectly;

    // Start is called before the first frame update
    void Start() {
        SetGiventQuestion();
    }

    public void SetGiventQuestion() {
        // if new game, create one question card to start with
        GameObject question = Instantiate(prefab, new Vector2(0, 0), Quaternion.identity) as GameObject;
        QuestionCard questionCard = question.GetComponent<QuestionCard>();
        questionCard.PrepareQuestion("QuestionText", "AnswerText");
        questionCard.GetQuestion(true);
        questionCard.SetQuestionSafe();

        questionCard.transform.SetSiblingIndex(0);
        questionCard.transform.SetParent(contentPanel);
    }

    public int GetUnlockedQuestionCount() {
        int unlockedQuestionCount = 0;
        for (int i = 0; i < contentPanel.childCount; i++) {
            QuestionCard qc = contentPanel.GetChild(i).GetComponent<QuestionCard>();
            if (!qc.IsQuestionSafe()) {
                unlockedQuestionCount++;
            }
        }
        return unlockedQuestionCount;
    }

    private void SetAllQuestionsLocked() {
        for (int i = 0; i < contentPanel.childCount; i++) {
            QuestionCard q = contentPanel.GetChild(i).GetComponent<QuestionCard>();
            q.SetQuestionSafe();
        }
    }

    public void OnDrop(PointerEventData eventData) {
        Draggable d = eventData.pointerDrag.GetComponent<Draggable>();
        if (d == null || !d.gameObject.name.Contains("NewQuestion")) {
            return;
        }
        nq = d.GetComponent<NewQuestion>();
        newQuestionSiblingIndex = d.placeholder.transform.GetSiblingIndex();

        GenericDialog dialog = GenericDialog.Instance();
        dialog.SetTitle("Är du säker?");
        dialog.SetMessage("Vill du svara att " + nq.GetQuestionText().text + " hände " + nq.GetAnswerText().text + "?");
        dialog.SetOnAccept("Ja", () => {
            YesFunction();
            dialog.Hide();


            if (answeredCorrectly) {
                dialog.SetTitle("Korrekt svarat " + nq.answerString + "!");
                dialog.SetMessage("Helt korrekt, vill du ha en ny fråga, du riskerar då " + GetUnlockedQuestionCount() + " om du svarar fel");
                dialog.SetOnAccept("Ja", () => {
                    dialog.Hide();
                    nq.SetQuestionData();
                    SetQuestionsInAnswerLine();
                }); // generera ny fråga
                dialog.SetOnDecline("Nej", () => {
                    dialog.Hide();
                    SetAllQuestionsLocked();
                    IncreaseRoundValue();
                    SetQuestionsInAnswerLine();
                }); // lås frågor som ej är låsta.
            } else {
                dialog.SetTitle("Tyvärr fel svar, korrekt svar var " + nq.answerString);
                dialog.SetMessage("Du förlorade " + GetUnlockedQuestionCount() + ", bättre lycka nästa gång");
                RemoveUnlockedQuestions();
                dialog.SetOnAccept("Ok", () => dialog.Hide());
                dialog.SetOnDecline("", () => dialog.Hide());
                IncreaseRoundValue();

                nq.SetQuestionData();
            }
            dialog.Show();

        });
        dialog.SetOnDecline("Nej", () => dialog.Hide());
        dialog.Show();
    }

    private void RemoveUnlockedQuestions() {
        int lostQuestions = 0;
        for (int i = 0; i < contentPanel.childCount; i++) {
            QuestionCard q = contentPanel.GetChild(i).GetComponent<QuestionCard>();
            if (!q.IsQuestionSafe()) {
                lostQuestions++;
                Destroy(q.gameObject);
            }
        }
        Text lostQuestionsValueText = GameObject.Find("Stats Value Lost").GetComponent<Text>();
        lostQuestionsValueText.text = (Int16.Parse(lostQuestionsValueText.text) + lostQuestions).ToString();

        SetQuestionsInAnswerLine(contentPanel.childCount - lostQuestions);
    }

    private void IncreaseRoundValue() {
        Text roundTextValue = GameObject.Find("Stats Value Round").GetComponent<Text>();
        roundTextValue.text = (Int16.Parse(roundTextValue.text) + 1).ToString();
    }

    private void SetQuestionsInAnswerLine() {
        Text answerlineTextValue = GameObject.Find("Stats Value Inline").GetComponent<Text>();
        answerlineTextValue.text = contentPanel.childCount.ToString();
    }

    private void SetQuestionsInAnswerLine(int answers) {
        Text answerlineTextValue = GameObject.Find("Stats Value Inline").GetComponent<Text>();
        answerlineTextValue.text = answers.ToString();
    }

    void YesFunction() {

        int correctAnswer = Int32.Parse(nq.answerString);
        int currentChildCount = contentPanel.childCount;
        Transform questionBefore = null;
        Transform questionAfter = null;
        if (newQuestionSiblingIndex - 1 > 0) {
            questionBefore = contentPanel.GetChild(newQuestionSiblingIndex - 1);
        }
        if (newQuestionSiblingIndex < currentChildCount) {
            questionAfter = contentPanel.GetChild(newQuestionSiblingIndex);
        }

        QuestionCard test = contentPanel.GetChild(0).GetComponent<QuestionCard>();
        int answerBefore = -1;
        int answerAfter = 999999;
        if (questionBefore != null) {
            answerBefore = Int16.Parse(questionBefore.GetComponent<QuestionCard>().GetAnswerText().text);
        }
        if (questionAfter != null) {
            answerAfter = Int16.Parse(questionAfter.GetComponent<QuestionCard>().GetAnswerText().text);
        }
        if (answerBefore <= correctAnswer && answerAfter >= correctAnswer) {
            // korrect svar, spara frågan i tidslinjen och prompta ny modal för "Vill du ha en fråga till?" med meddelande om vad som står på spel (olåsta frågor)

            GameObject question = Instantiate(prefab, new Vector2(0, 0), Quaternion.identity) as GameObject;
            QuestionCard questionCard = question.GetComponent<QuestionCard>();

            questionCard.SetAnswerText(nq.answerString);
            questionCard.SetQuestionText(nq.questionString);
            questionCard.questionString = nq.questionString;
            questionCard.answerString = nq.answerString;
            questionCard.categoryString = nq.categoryString;
            questionCard.idString = nq.idString;

            questionCard.transform.SetParent(contentPanel);
            questionCard.transform.SetSiblingIndex(newQuestionSiblingIndex);

            answeredCorrectly = true;
        } else {
            answeredCorrectly = false;
        }
    }

    void NoFunction() {
    }
}