using Convention;
using Demo.Attr;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace Demo.Game
{
    [Scriptable]
    public class SkyUpdatement : Updatement<int>, IAssetBundleLoader
    {
        public static SkyUpdatement Make()
        {
            return new GameObject().AddComponent<SkyUpdatement>();
        }

        private int SkyAssetBundleLoaderStatus = 0;
        private readonly Dictionary<string, int> NameCache = new();
        private readonly Dictionary<int, Material> MaterialCache = new();

        public string SkyAssetBundlePath;
        public AssetBundle SkyAssetBundle;

        protected override int Lerp(int begin, int end, float t)
        {
            return begin;
        }

        [Content, SerializeField] private int Cache = -1;

        protected override IEnumerator DoSomethingDuringApplyScript()
        {
            yield return base.DoSomethingDuringApplyScript();
            yield return new WaitUntil(() => SkyAssetBundleLoaderStatus == 0);
        }

        protected override void UpdateData(int data)
        {
            if (string.IsNullOrEmpty(SkyAssetBundlePath))
                return;
            if (Cache != data)
            {
                if (data < 0)
                    RenderSettings.skybox = null;
                else
                    RenderSettings.skybox = MaterialCache[data];
                Cache = data;
            }
        }

        public override IEnumerator UnloadScript()
        {
            Cache = -1;
            if (string.IsNullOrEmpty(SkyAssetBundlePath) == false)
                yield return this.UnloadAssetBundle(SkyAssetBundlePath);
            SkyAssetBundlePath = "";
            yield return base.UnloadScript();
        }

        /// <summary>
        /// 对应ab包名称，自动匹配对应平台
        /// </summary>
        /// <param name="ab"></param>
        [Convention.RScript.Variable.Attr.Method]
        public void Load(string ab)
        {
            SkyAssetBundleLoaderStatus++;
            ConventionUtility.StartCoroutine(this.LoadAssetBundle(ab, x =>
             {
                 SkyAssetBundlePath = ab;
                 SkyAssetBundle = x;
                 SkyAssetBundleLoaderStatus--;
             }));
        }

        /// <summary>
        /// 在指定时刻切换天空
        /// </summary>
        /// <param name="time"></param>
        /// <param name="sky"></param>
        [Convention.RScript.Variable.Attr.Method]
        public void Add(float time, string sky)
        {
            IEnumerator Foo()
            {
                yield return new WaitUntil(() => SkyAssetBundle != null);
                var ir = SkyAssetBundle.LoadAssetAsync<Material>(sky);
                ir.completed += delegate
                {
                    var mat = ir.asset as Material;
                    if (NameCache.TryGetValue(sky, out int id) == false)
                    {
                        id = NameCache.Count;
                        NameCache[sky] = id;
                    }
                    MaterialCache[id] = mat;
                    ManualAddEntry(time, id, default);
                    SkyAssetBundleLoaderStatus--;
                };
                yield return ir;
            }
            SkyAssetBundleLoaderStatus++;
            ConventionUtility.StartCoroutine(Foo());
        }
    }
}