using System;
using UnityEditor;
using UnityEngine;
using UnityEngine.Events;

public abstract class EditorPerFrameActionBase
{
    public event UnityAction<bool, EditorPerFrameActionBase> onFinish;
    protected readonly string title;
    protected abstract int GetTotalCount();
    protected abstract int GetCurrentIndex();
    protected abstract void PerFrameAction();

    protected virtual void OnFinish()
    {
    }

    protected EditorPerFrameActionBase()
    {
        title = GetType().ToString();
    }

    public void Start()
    {
        EditorApplication.update = OnEditorUpdate;
    }

    private void OnEditorUpdate()
    {
        var finish = false;
        var error = false;
        try
        {
            var current = GetCurrentIndex();
            var total = GetTotalCount();
            if (current < total)
            {
                EditorUtility.DisplayProgressBar(title, string.Format("Action {0} / {1}", current, total), (float)current / total);
                PerFrameAction();
            }
            else
            {
                finish = true;
                Debug.LogWarning("Editor Per Frame Action Complete " + GetType());
            }
        }
        catch (Exception e)
        {
            finish = true;
            error = true;
            Debug.LogError(e.ToString());
            Debug.LogError("Editor Per Frame Action Exit by Exception " + GetType());
        }
        if (finish)
        {
            EditorApplication.update = null;
            EditorUtility.ClearProgressBar();
            OnFinish();
            if (onFinish != null)
                onFinish(!error, this);
        }
    }
}