using System;
using System.Collections;
using System.Collections.Generic;
using Ichni.RhythmGame.Beatmap;
using UnityEngine;

namespace Ichni.RhythmGame
{
    public partial class SkyboxSubsetter : GameElement
    {
        #region [核心组件与天空盒列表] Core Components & Skybox Lists
        public SkyboxBlender skyboxBlender;
        public List<string> skyBoxThemeBundleList;
        public List<string> skyboxNameList;
        public List<Material> skyboxMaterialList;
        public List<float> blendSpeedList;
        public List<float> blendTimeList;
        public int currentSkyboxIndex = 0;
        #endregion
        
        #region [编辑器UI支持] Editor Selection Tools
        public List<string> themeBundleListForSelection;
        public List<string> skyboxNameListForSelection;
        public string selectedThemeBundle;
        public string selectedSkybox;
        #endregion
        
        #region [生命周期] Lifecycle & Factory
        public static SkyboxSubsetter GenerateElement(string elementName, Guid id, List<string> tags,
            bool isFirstGenerated, GameElement parentElement, List<string> themeBundleList,List<string> skyboxList,
            List<float> blendTimeList, List<float> blendSpeedList)
        {
            SkyboxSubsetter skyboxSubsetter = Instantiate(GameManager.Instance.basePrefabs.emptyObject)
                .AddComponent<SkyboxSubsetter>();
            GameManager.Instance.backgroundSetter.skyboxSubsetter = skyboxSubsetter;
            skyboxSubsetter.Initialize(elementName, id, tags, isFirstGenerated, parentElement);
            skyboxSubsetter.skyBoxThemeBundleList = themeBundleList;
            skyboxSubsetter.skyboxNameList = skyboxList;
            skyboxSubsetter.skyboxMaterialList = new List<Material>();
            skyboxSubsetter.blendTimeList = blendTimeList;
            skyboxSubsetter.blendSpeedList = blendSpeedList;
            skyboxSubsetter.SetUpBlender();
            skyboxSubsetter.themeBundleListForSelection = ThemeBundleManager.instance.loadedThemeBundleList.ConvertAll(x => x.themeBundleName);
            skyboxSubsetter.skyboxNameListForSelection = new List<string>();
            skyboxSubsetter.selectedThemeBundle = String.Empty;
            skyboxSubsetter.selectedSkybox = String.Empty;
            return skyboxSubsetter;
        }
        #endregion

        #region [内部设置与工具] Internal Configs & Utils
        private void SetUpBlender()
        {
            skyboxBlender = gameObject.AddComponent<SkyboxBlender>();
            skyboxBlender.loop = false;
            skyboxBlender.timeToWait = 0f;
            skyboxBlender.updateLighting = false;
            skyboxBlender.updateReflections = false;
            skyboxBlender.skyboxMaterials = new List<Material>();
            for (int i = 0; i < skyBoxThemeBundleList.Count; i++)
            {
                Material skybox = ThemeBundleManager.instance.GetObject<Material>(skyBoxThemeBundleList[i], skyboxNameList[i]);
                skyboxMaterialList.Add(skybox);
                skyboxBlender.skyboxMaterials.Add(skybox);
            }
            skyboxBlender.makeFirstMaterialSkybox = true;
            skyboxBlender.InspectorAndAwakeChanges();
        }
        
        private void AddSkybox(string skyboxThemeBundleName, string skyboxObjectName)
        {
            Material skybox = ThemeBundleManager.instance.GetObject<Material>(skyboxThemeBundleName, skyboxObjectName);
            if (skybox != null)
            {
                skyBoxThemeBundleList.Add(skyboxThemeBundleName);
                skyboxNameList.Add(skyboxObjectName);
                skyboxMaterialList.Add(skybox);
                skyboxBlender.skyboxMaterials.Add(skybox);
            }
        }
        #endregion
        
        #region [轮询更新] Main Update
        private void Update()
        {
            if (skyBoxThemeBundleList.Count > 1)
            {
                float songTime = CoreServices.TimeProvider.SongTime;
                float delay = GameManager.Instance.songInformation.delay;
                float finalTime = 32767; // 曲目长度

                for (var index = 0; index < blendTimeList.Count + 1; index++)
                {
                    float startTime = index == 0 ? -delay : blendTimeList[index - 1];
                    float endTime = index >= blendTimeList.Count ? finalTime : blendTimeList[index];
                    if(songTime >= startTime && songTime < endTime && currentSkyboxIndex != index)
                    {
                        currentSkyboxIndex = index;
                        if(currentSkyboxIndex != 0) skyboxBlender.blendSpeed = blendSpeedList[currentSkyboxIndex - 1];
                        skyboxBlender.Blend(currentSkyboxIndex, false);
                        DynamicGI.UpdateEnvironment();
                    }
                }
            }
        }
        #endregion

    }

}