using UnityEngine;
using UnityEngine.UI;

public class QuestManager : MonoBehaviour
{
    private const string LevelCompletePanelKey = "LevelComplete";

    public static QuestManager Instance { get; private set; }

    [SerializeField] private int totalNotes = 3;
    [SerializeField] private Text statusText;
    [SerializeField] private GameObject questCompletePanel;
    [SerializeField] private Text questCompleteText;
    [SerializeField] private GameObject exitDoor;
    [SerializeField] private GameObject exitTrigger;
    [SerializeField] private GameObject levelCompletePanel;
    [SerializeField] private Text levelCompleteText;

    private int notesCollected;
    private bool talkedToNPC;
    private bool questCompleted;
    private bool levelFinished;

    public int TotalNotes => totalNotes;
    public int NotesCollected => notesCollected;
    public bool TalkedToNPC => talkedToNPC;
    public bool IsQuestCompleted => questCompleted;
    public bool HasCollectedAllNotes => notesCollected >= totalNotes;
    public bool IsLevelFinished => levelFinished;

    public void Configure(
        Text statusLabel,
        GameObject completionPanel,
        Text completionLabel,
        GameObject doorObject,
        GameObject exitTriggerObject,
        GameObject levelFinishedPanel,
        Text levelFinishedLabel,
        int requiredNotes)
    {
        statusText = statusLabel;
        questCompletePanel = completionPanel;
        questCompleteText = completionLabel;
        exitDoor = doorObject;
        exitTrigger = exitTriggerObject;
        levelCompletePanel = levelFinishedPanel;
        levelCompleteText = levelFinishedLabel;
        totalNotes = Mathf.Max(1, requiredNotes);

        if (questCompletePanel != null)
        {
            questCompletePanel.SetActive(false);
        }

        if (exitTrigger != null)
        {
            exitTrigger.SetActive(false);
        }

        if (levelCompletePanel != null)
        {
            levelCompletePanel.SetActive(false);
        }

        UpdateStatus();
    }

    private void Awake()
    {
        if (Instance != null && Instance != this)
        {
            Destroy(gameObject);
            return;
        }

        Instance = this;

        if (questCompletePanel != null)
        {
            questCompletePanel.SetActive(false);
        }

        if (exitTrigger != null)
        {
            exitTrigger.SetActive(false);
        }

        if (levelCompletePanel != null)
        {
            levelCompletePanel.SetActive(false);
        }

        UpdateStatus();
    }

    public void NoteCollected()
    {
        notesCollected = Mathf.Min(notesCollected + 1, totalNotes);
        UpdateStatus();
        CheckCompletion();
    }

    public void NPCTalked()
    {
        if (talkedToNPC)
        {
            return;
        }

        talkedToNPC = true;
        UpdateStatus();
        CheckCompletion();
    }

    public void FinishLevel()
    {
        if (!questCompleted || levelFinished)
        {
            return;
        }

        levelFinished = true;

        if (levelCompletePanel != null)
        {
            levelCompletePanel.SetActive(true);
        }

        if (levelCompleteText != null)
        {
            levelCompleteText.text = "Уровень завершен!\nЛабораторная работа пройдена.";
        }

        GameUIState.SetPanelOpen(LevelCompletePanelKey, true);
        UpdateStatus();
    }

    private void CheckCompletion()
    {
        if (questCompleted || notesCollected < totalNotes || !talkedToNPC)
        {
            return;
        }

        questCompleted = true;

        if (exitDoor != null)
        {
            exitDoor.SetActive(false);
        }

        if (exitTrigger != null)
        {
            exitTrigger.SetActive(true);
        }

        if (questCompletePanel != null)
        {
            questCompletePanel.SetActive(true);
        }

        if (questCompleteText != null)
        {
            questCompleteText.text = "Квест выполнен!\nВыход открыт.";
        }

        UpdateStatus();
    }

    private void UpdateStatus()
    {
        if (statusText == null)
        {
            return;
        }

        statusText.text =
            $"Записки: {notesCollected}/{totalNotes}\n" +
            $"Диалог с NPC: {(talkedToNPC ? "✓" : "✗")}\n" +
            (levelFinished
                ? "Статус: уровень завершен"
                : questCompleted
                    ? "Статус: пройдите к выходу"
                    : "Статус: исследуйте уровень");
    }
}