#if UNITY_EDITOR
using Sirenix.OdinInspector.Editor;
using Sirenix.Utilities;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using UnityEditor;
using UnityEngine;

// 
// With our custom RPG Editor window, this ScriptableObjectCreator is a replacement for the [CreateAssetMenu] attribute Unity provides.
// 
// For instance, if we call ScriptableObjectCreator.ShowDialog<Item>(..., ...), it will automatically find all 
// ScriptableObjects in your project that inherits from Item and prompts the user with a popup where he 
// can choose the type of item he wants to create. We then also provide the ShowDialog with a default path,
// to help the user create it in a specific directory.
// 

public static class ScriptableObjectCreator
{
    public static void ShowDialog<T>(string defaultDestinationPath, Action<T> onScritpableObjectCreated = null)
        where T : ScriptableObject
    {
        var selector = new ScriptableObjectSelector<T>(defaultDestinationPath, onScritpableObjectCreated);

        if (selector.SelectionTree.EnumerateTree().Count() == 1)
        {
            // If there is only one scriptable object to choose from in the selector, then 
            // we'll automatically select it and confirm the selection. 
            selector.SelectionTree.EnumerateTree().First().Select();
            selector.SelectionTree.Selection.ConfirmSelection();
        }
        else
        {
            // Else, we'll open up the selector in a popup and let the user choose.
            selector.ShowInPopup(200);
        }
    }

    // Here is the actual ScriptableObjectSelector which inherits from OdinSelector.
    // You can learn more about those in the documentation: http://sirenix.net/odininspector/documentation/sirenix/odininspector/editor/odinselector(t)
    // This one builds a menu-tree of all types that inherit from T, and when the selection is confirmed, it then prompts the user
    // with a dialog to save the newly created scriptable object.

    private class ScriptableObjectSelector<T> : OdinSelector<Type> where T : ScriptableObject
    {
        private Action<T> onScritpableObjectCreated;
        private string defaultDestinationPath;

        public ScriptableObjectSelector(string defaultDestinationPath, Action<T> onScritpableObjectCreated = null)
        {
            this.onScritpableObjectCreated = onScritpableObjectCreated;
            this.defaultDestinationPath = defaultDestinationPath;
            this.SelectionConfirmed += this.ShowSaveFileDialog;
        }

        protected override void BuildSelectionTree(OdinMenuTree tree)
        {
            var scriptableObjectTypes = AssemblyUtilities.GetTypes(AssemblyTypeFlags.CustomTypes)
                .Where(x => x.IsClass && !x.IsAbstract && x.InheritsFrom(typeof(T)));

            tree.Selection.SupportsMultiSelect = false;
            tree.Config.DrawSearchToolbar = true;
            tree.AddRange(scriptableObjectTypes, x => x.GetNiceName())
                .AddThumbnailIcons();
        }

        private void ShowSaveFileDialog(IEnumerable<Type> selection)
        {
            var obj = ScriptableObject.CreateInstance(selection.FirstOrDefault()) as T;

            string dest = this.defaultDestinationPath.TrimEnd('/');

            if (!Directory.Exists(dest))
            {
                Directory.CreateDirectory(dest);
                AssetDatabase.Refresh();
            }

            dest = EditorUtility.SaveFilePanel("Save object as", dest, "New " + typeof(T).GetNiceName(), "asset");

            if (!string.IsNullOrEmpty(dest) && PathUtilities.TryMakeRelative(Path.GetDirectoryName(Application.dataPath), dest, out dest))
            {
                AssetDatabase.CreateAsset(obj, dest);
                AssetDatabase.Refresh();

                if (this.onScritpableObjectCreated != null)
                {
                    this.onScritpableObjectCreated(obj);
                }
            }
            else
            {
                UnityEngine.Object.DestroyImmediate(obj);
            }
        }
    }
}
#endif