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

public class LoadManager : MonoBehaviour
{
    public bool IsEnteringNewGame;
    public bool LoadingGame;
    public bool LoadingMainMenu;

    public event Action OnScenesLoaded;
    public bool noneAdditiveScenes;

    private int remainingAdditiveScenes; // Μεταβλητό πεδίο της κλάσης

    private static LoadManager _instance;
    public static LoadManager GetInstance() { return _instance; }

    private void Awake()
    {
        if (!_instance)
        {
            _instance = this;
        }
    }

    public void NewGame() 
    {
        IsEnteringNewGame = true;
    }

    public void LoadMainMenu() 
    {
        LoadingMainMenu = true;
        SaveSlotManager.GetInstance().LoadingScreen.SetActive(true);
        SaveSlotManager.GetInstance().loadingUIAnimator.SetBool("FadeIn", true);
        SceneManager.LoadScene("MainMenu");
    }

    public void LoadGame() 
    {
        //PlayerData loadedData = SaveSlotManager.LoadPlayerData(0);
        //if (loadedData != null)
        //{
        //    // Use the loaded data to set the player's state
        //    // Example:       
        //    PlayerManager.GetInstance().PlayerGO.transform.position = loadedData.playerPosition;
        //    LoadingGame = true;
        //}

        GameSaveData loadedData = SaveSlotManager.LoadPlayerData(SaveSlotManager.GetInstance().selectedSaveSlotID /*Change later to take the ID of the currently selected Save slot*/);

        // Load the scene first
        LoadingGame = true;
        //LoadSceneAsync(loadedData.gameProgressData.currentActiveScene);

        //New way of loading multiple scenes:
        LoadMainAndAdditiveScenesAsync(loadedData.gameProgressData.currentActiveScene, loadedData.gameProgressData.currentAdditiveScenes);
        //LoadScene.LoadMainAndAdditiveScenesTogether(loadedData.gameProgressData.currentActiveScene, loadedData.gameProgressData.currentAdditiveScenes);
        //StartCoroutine(LoadScene.LoadMainAndAdditiveScenesTogetherCoroutine(loadedData.gameProgressData.currentActiveScene, loadedData.gameProgressData.currentAdditiveScenes));
    }

    public void LoadMainAndAdditiveScenesAsync(string MainSceneName, string[] additionalScenes)
    {
        // StartCoroutine(LoadMainAndAdditiveScenesAsyncEnumerator(MainSceneName, additionalScenes));
        //Time.timeScale = 0;
        StartCoroutine(LoadMainAndAdditiveScenesAsyncREAL(MainSceneName, additionalScenes));
      
    }

    #region OLD
    private IEnumerator LoadMainAndAdditiveScenesAsyncEnumerator(string MainSceneName, string[] additionalScenes)
    {
        yield return StartCoroutine(AsyncLoader.LoadMainAndAdditiveScenesAsync(MainSceneName, additionalScenes));
    }

    private void LoadSceneAsync( string sceneName)
    {
        StartCoroutine(LoadSceneAsyncEnumerator(sceneName));
    }

    private IEnumerator LoadSceneAsyncEnumerator(string sceneName)
    {
        yield return StartCoroutine(AsyncLoader.LoadSceneAsync(sceneName, OnProgress, OnComplete));
    }

    private void OnProgress(float progress)
    {
        Debug.Log("Loading progress: " + (progress * 100) + "%");
    }

    private void OnComplete()
    {
        Debug.Log("Scene loaded!");
    }
    #endregion
    public IEnumerator LoadMainAndAdditiveScenesAsyncREAL(string mainSceneName, string[] additionalScenes)
    {
        remainingAdditiveScenes = additionalScenes.Length; // Ορίζουμε το αρχικό πλήθος
        if (additionalScenes.Length <= 0)
        {
            noneAdditiveScenes = true;
        }
        // Load the main scene asynchronously
        AsyncOperation mainSceneLoading = SceneManager.LoadSceneAsync(mainSceneName);

        // Load additional scenes additively asynchronously
        foreach (string sceneName in additionalScenes)
        {
            AsyncOperation additionalSceneLoading = SceneManager.LoadSceneAsync(sceneName, LoadSceneMode.Additive);
            StartCoroutine(WaitForAsyncOperationAdditive(additionalSceneLoading)); // Χωρίς ref
        }

        // Wait until the main scene is fully loaded
        yield return WaitForAsyncOperationMainScene(mainSceneLoading, noneAdditiveScenes);
    }

    private IEnumerator WaitForAsyncOperationMainScene(AsyncOperation operation, bool noAdditiveScenes)
    {
        while (!operation.isDone)
        {
            float progress = Mathf.Clamp01(operation.progress / 0.9f);
            Debug.Log("Loading scene progress: " + (progress * 100) + "%");
            yield return null;
        }
        if (noAdditiveScenes)
        {
            print("IM DONE NO ADDITIVE SCENES !!!!!!!!!!!!!!!!!!!!! WE LITERALLY HIT 15 HOURS OF WORK TODAY (AGAIN)");
            // Notify subscribers that scenes are loaded
            OnScenesLoaded?.Invoke();
            //Time.timeScale = 1;
            noneAdditiveScenes = false;
        }
        print("Main scene loaded!");
    }

    private IEnumerator WaitForAsyncOperationAdditive(AsyncOperation operation)
    {
        while (!operation.isDone)
        {
            float progress = Mathf.Clamp01(operation.progress / 0.9f);
            Debug.Log("Loading additive scene progress: " + (progress * 100) + "%");
            yield return null;
        }

        remainingAdditiveScenes--; // Μειώνουμε τον counter
        print($"Additive scene loaded! Remaining: {remainingAdditiveScenes}");

        if (remainingAdditiveScenes <= 0) // Μόνο όταν όλες οι additive σκηνές φορτωθούν
        {
            print("All additive scenes loaded! Calling OnScenesLoaded...");
            OnScenesLoaded?.Invoke();
        }
    }
}