using System;
using System.Collections;
using System.Collections.Generic;
using NaughtyAttributes;
using UnityEngine;

public class EnvironmentObserver : MonoBehaviour
{
    private Environment environment;
    private CommandSaveHandler commandSaveHandler;
    [SerializeField] private bool autoSaving = true;
    private bool canSave = true;
    private bool isLoading = false;
    private Coroutine loadCoroutine;

    private void Start()
    {
        environment = Environment.getInstance();
        commandSaveHandler = CommandSaveHandler.getInstance();

        environment.onChangeEvent.AddListener(onChange);
    }

    private void onChange()
    {
        if (autoSaving && canSave && !isLoading)
            save();
    }

    public void save()
    {
        if (isLoading)
        {
            Debug.LogWarning("Cannot save while a load operation is in progress.");
            return;
        }

        commandSaveHandler.clearCommandList();
        addAllCommands();
        commandSaveHandler.saveCommands();
    }

    public void saveToPath(string path)
    {
        if (isLoading)
        {
            Debug.LogWarning("Cannot save while a load operation is in progress.");
            return;
        }

        commandSaveHandler.clearCommandList();
        addAllCommands();
        commandSaveHandler.saveCommandsToPath(path);
    }

    [Button("load")]
    public void load()
    {
        if (loadCoroutine != null)
        {
            StopCoroutine(loadCoroutine);
            loadCoroutine = null;
        }

        isLoading = true;
        canSave = false;

        environment.clearEnvironment();
        commandSaveHandler.clearCommandList();
        commandSaveHandler.loadCommands();
        loadCoroutine = StartCoroutine(commandSaveHandler.excuteAllCommands(() => {
            loadCoroutine = null;
            StartCoroutine(reloadSave());
        }));
    }

    public void loadFromPath(string path)
    {
        if (loadCoroutine != null)
        {
            StopCoroutine(loadCoroutine);
            loadCoroutine = null;
        }

        isLoading = true;
        canSave = false;

        environment.clearEnvironment();
        commandSaveHandler.clearCommandList();
        commandSaveHandler.loadCommandsFromPath(path);
        loadCoroutine = StartCoroutine(commandSaveHandler.excuteAllCommands(() => {
            loadCoroutine = null;
            StartCoroutine(reloadSave());
        }));
    }

    private IEnumerator reloadSave()
    {
        // Wait for 1 full second to ensure all physics collisions and delayed events have fully settled
        yield return new WaitForSeconds(1f);
        isLoading = false;
        canSave = true;
        Debug.Log("Loading complete. Auto-save is now re-enabled.");
    }


    private void addAllCommands()
    {
        Dictionary<string, Block> blockRegistry = environment.getBlockRegistry();
        foreach (var blockEntry in blockRegistry)
        {
            if (blockEntry.Value != null)
            {
                string prefabId = blockEntry.Value.getBlockData()?.blockName;
                Vector3 position = blockEntry.Value.transform.position;
                Quaternion rotation = blockEntry.Value.transform.rotation;
                ICommand createCommand = new CreateBlockCommand(prefabId, position, rotation);
                commandSaveHandler.addLastCommand(createCommand.toDTO());
            }
        }
    }
}