using System.Collections;
using Ichni.RhythmGame;
using UnityEngine;
using UnityEngine.InputSystem;

namespace Ichni.Editor
{
    /// <summary>
    /// 编辑器的音乐播放控制器。
    /// 实现 ISongTimeProvider，作为编辑器的标准时间来源，
    /// 在 EditorManager.Awake 中注册到 CoreServices.TimeProvider。
    /// </summary>
    public class MusicPlayer : MonoBehaviour, ISongTimeProvider
    {
        #region [ISongTimeProvider 实现] ISongTimeProvider Implementation
        /// <summary>当前播放进度（秒），已扣除 offset，供 CoreServices.TimeProvider 使用</summary>
        public float SongTime => EditorManager.instance != null ? EditorManager.instance.songInformation.songTime : 0;

        /// <summary>当前是否正在播放</summary>
        public bool IsPlaying => isPlaying;
        #endregion

        #region [运行时缓存数据] Property Caches
        public bool isDebugging;
        public bool isPlaying;
        public AudioSource audioSource;
        private float DspTime => (float)AudioSettings.dspTime;
        
        public AudioHighPassFilter  highPassFilter;
        public AudioLowPassFilter   lowPassFilter;
        
        #endregion

        #region [生命周期] Lifecycle
        private void Update()
        {
            if (isDebugging)
            {
                EditorManager.instance.songInformation.songTime += Time.deltaTime;
                return;
            }

            if (isPlaying)
            {
                EditorManager.instance.songInformation.songTime =
                    audioSource.time - EditorManager.instance.songInformation.offset;
            }
        }
        #endregion

        #region [播放控制] Playback Control
        public void PlayMusic()
        {
            isPlaying = !isPlaying;
            audioSource.time = EditorManager.instance.songInformation.songTime +
                                EditorManager.instance.songInformation.offset;
            if (isPlaying)
            {
                Trail.FreezeAllTrails(!isPlaying);
                audioSource.Play();
            }
            else PauseMusic();
        }

        public IEnumerator PlayBackMusic()
        {
            float startt = audioSource.time - EditorManager.instance.songInformation.offset;
            PlayMusic();
            yield return new WaitUntil(() => Keyboard.current.rightAltKey.wasReleasedThisFrame);
            audioSource.time = startt + EditorManager.instance.songInformation.offset;
            PauseMusic();
        }

        public void PauseMusic()
        {
            if (isPlaying)
            {
                EditorManager.instance.songInformation.songTime =
                    audioSource.time - EditorManager.instance.songInformation.offset;
            }
            isPlaying = false;
            audioSource.Pause();
            Trail.FreezeAllTrails(!isPlaying);
        }

        public void StopMusic()
        {
            isPlaying = false;
            EditorManager.instance.songInformation.songTime = 0;
            audioSource.Stop();
        }
        #endregion
    }
}