using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Sirenix.OdinInspector;
using SLSUtilities.General;
using SLSUtilities.Rendering.PostProcessing;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;

namespace Ichni
{
    public class PostProcessingManager : Singleton<PostProcessingManager>
    {
        /// <summary>
        /// 当前已加载的 GameScene 后处理管理器。MenuScene 等未创建该对象的场景会返回 <c>null</c>。
        /// </summary>
        public static new PostProcessingManager Instance => instance;

        public static Volume GlobalVolume => instance.globalVolume;

        [ShowInInspector]
        public Volume globalVolume;

        protected override void Awake()
        {
            base.Awake();
            if (globalVolume != null)
            {
                // Force instantiate the volume profile on awake so it doesn't happen mid-game
                _ = globalVolume.profile;
            }

            // GameScene 的 Global Volume 创建时，重新应用已加载的玩家设置，覆盖场景切换时的默认值。
            SettingsManager.instance?.ApplyPostProcessingSettings();
        }

        /// <summary>
        /// 将全局后处理状态与 Anime Bloom 档位写入 GameScene 的运行时 Profile。
        /// Volume.profile 会提供运行时实例，因此不会修改磁盘上的 SampleSceneProfile 资产。
        /// </summary>
        public void ApplySettings(bool enablePostProcessing, BloomQuality bloomQuality)
        {
            globalVolume.enabled = enablePostProcessing;

            if (!enablePostProcessing || !globalVolume.profile.TryGet(out AnimeBloom animeBloom))
            {
                return;
            }

            animeBloom.active = bloomQuality != BloomQuality.Off;
            if (animeBloom.active)
            {
                animeBloom.diffusion.value = bloomQuality == BloomQuality.Performance ? 5 : 6;
            }
        }
    }
}