using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;

public class CommandSaveHandler
{
    private static CommandSaveHandler instance;

    private LinkedList<CommandDTO> commandList = new LinkedList<CommandDTO>();
    private string saveFilePath = Path.Combine(Application.persistentDataPath, "commands.json");

    public static CommandSaveHandler getInstance()
    {
        if (instance == null)
        {
            instance = new CommandSaveHandler();
        }
        return instance;
    }

    public void setFileName(string fileName)
    {
        saveFilePath = Path.Combine(Application.persistentDataPath, fileName);
    }

    public void setAbsoluteFilePath(string path)
    {
        saveFilePath = path;
    }

    public void saveCommands()
    {
        CommandSaveUtil.saveLinkedList(commandList, saveFilePath);
    }

    public void saveCommandsToPath(string customPath)
    {
        CommandSaveUtil.saveLinkedList(commandList, customPath);
    }

    public void loadCommands()
    {
        commandList = CommandSaveUtil.loadLinkedList(saveFilePath);
    }

    public void loadCommandsFromPath(string customPath)
    {
        commandList = CommandSaveUtil.loadLinkedList(customPath);
    }

    public IEnumerator excuteAllCommands(Action action)
    {
        if (commandList == null || commandList.Count == 0)
        {
            action?.Invoke();
            yield break;
        }
        yield return null; // Wait for the next frame
        foreach (CommandDTO commandDTO in commandList)
        {
            if (commandDTO == null)
                continue;

            ICommand command = commandDTO.converToCommand();
            if (command != null)
            {
                command.execute();
                Debug.Log("Executed command from DTO: " + commandDTO.CommandName);
            }
            else
            {
                Debug.LogWarning("Failed to convert CommandDTO to ICommand.");
            }
            yield return null; // Wait for the next frame
        }
        action.Invoke();
    }

    public void addLastCommand(CommandDTO command)
    {
        commandList.AddLast(command);
    }

    public void removeLastCommand()
    {
        if (commandList.Count > 0)
        {
            commandList.RemoveLast();
        }
    }

    public void clearCommandList()
    {
        commandList.Clear();
    }
}