using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using UnityEditor;
using UnityEngine;

[assembly: InternalsVisibleTo("Assembly-CSharp-Editor")]
[assembly: InternalsVisibleTo("AmaDev.Tests.Editor")]

namespace Amanotes.Core
{
    /// <summary>
    /// Unified settings asset for AmaDev tools.
    /// Each subsystem extends this via partial + inner classes.
    /// Created from the AmaDev panel — no CreateAssetMenu.
    /// </summary>
    internal partial class AmaDevSettings : ScriptableObject
    {
        private const string DefaultAssetPath = "Assets/AmaDevSettings.asset";

        private static AmaDevSettings _instance;

        internal static AmaDevSettings Instance
        {
            get
            {
                if (_instance != null) return _instance;
                _instance = FindInstance();
                return _instance;
            }
        }

        internal static void ClearCache() => _instance = null;

        private static AmaDevSettings FindInstance()
        {
            var guids = AssetDatabase.FindAssets("t:AmaDevSettings");
            if (guids.Length == 0) return null;
            var path = AssetDatabase.GUIDToAssetPath(guids[0]);
            return AssetDatabase.LoadAssetAtPath<AmaDevSettings>(path);
        }

        internal static AmaDevSettings GetOrCreate()
        {
            var instance = Instance;
            if (instance != null) return instance;

            instance = CreateInstance<AmaDevSettings>();
            AssetDatabase.CreateAsset(instance, AssetDatabase.GenerateUniqueAssetPath(DefaultAssetPath));
            AssetDatabase.SaveAssets();
            _instance = instance;
            return instance;
        }

        internal void MarkDirty()
        {
            EditorUtility.SetDirty(this);
        }
    }
}