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

namespace Ichni.RhythmGame
{
    public class BeatmapContainer : IBaseElement
    {
        public List<GameElement> gameElementList;
        
        [NonSerialized]
        public List<UnityAction> lowPriorityActions;
        
        public BaseElement_BM matchedBM { get; set; }

        public BeatmapContainer()
        {
            gameElementList = new List<GameElement>();
            lowPriorityActions = new List<UnityAction>();
            // UniRx Observable.EveryUpdate 已移除：低优先级操作由 ElementUpdateScheduler Phase 8 在 TickLate 中驱动
        }
        
        public void ExecuteLowPriorityActions()
        {
            if (lowPriorityActions.Count > 0)
            {
                lowPriorityActions.ForEach(low => low.Invoke());
                lowPriorityActions.Clear();
            }
        }

        /// <summary>
        /// Rebuilds the list of elements whose active state is driven by a finite time duration.
        /// This preserves the existing runtime filter, while avoiding a LINQ allocation during
        /// every project load.
        /// </summary>
        public void RebuildRuntimeTimeDurations()
        {
            List<TimeDurationSubmodule> runtimeTimeDurations = GameManager.Instance.timeDurations;
            runtimeTimeDurations.Clear();

            float songLength = GameManager.Instance.songInformation.songLength;
            for (int i = 0; i < gameElementList.Count; i++)
            {
                if (gameElementList[i] is not IHaveTimeDurationSubmodule timeDurationHost)
                {
                    continue;
                }

                TimeDurationSubmodule timeDuration = timeDurationHost.timeDurationSubmodule;
                if (timeDuration != null &&
                    (timeDuration.startTime > 0f || timeDuration.endTime < songLength))
                {
                    runtimeTimeDurations.Add(timeDuration);
                }
            }
        }

        /// <summary>
        /// Immediately applies the active state for the registered time-duration elements.
        /// Used at loading-state boundaries so the first rendered frame already matches the
        /// current song timeline.
        /// </summary>
        public void SyncRuntimeTimeDurationStates(float songTime)
        {
            List<TimeDurationSubmodule> runtimeTimeDurations = GameManager.Instance.timeDurations;
            for (int i = 0; i < runtimeTimeDurations.Count; i++)
            {
                runtimeTimeDurations[i]?.DetectAndSwitchActiveState(songTime);
            }
        }

        public void SetUpInspector()
        {
            throw new System.NotImplementedException();
        }

        public void Refresh()
        {
            throw new System.NotImplementedException();
        }
    }

}