using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Dreamteck.Splines;
using Ichni.RhythmGame.Beatmap;
using Lean.Pool;
using UniRx;
using Unity.VisualScripting;
using UnityEngine;

namespace Ichni.RhythmGame
{
    public partial class Flick : NoteBase
    {
        public List<Vector2> availableFlickDirections;
        public float flickBuffer = 0.5f;

        public static Flick GenerateElement(string elementName, Guid id, List<string> tags, bool isFirstGenerated,
            GameElement parentElement, float exactJudgeTime, List<Vector2> directions)
        {
            Flick flick = Instantiate(GameManager.instance.basePrefabs.flickNote, parentElement.transform).GetComponent<Flick>();
            
            flick.Initialize(elementName, id, tags, isFirstGenerated, parentElement);
            flick.exactJudgeTime = exactJudgeTime;
            flick.availableFlickDirections = new List<Vector2>() { Vector2.left, Vector2.right };
            flick.judgeIntervals = new NoteJudgeIntervals(
                new TimeInterval(-0.15f, -0.15f), new TimeInterval(-0.15f, -0.15f),
                new TimeInterval(-0.15f, -0.15f), new TimeInterval(-0.15f, 0.15f),
                new TimeInterval(0.15f, 0.15f), new TimeInterval(0.15f, 0.15f), 0.15f);

            if (parentElement.TryGetComponent(out Track track))
            {
                if (track.trackTimeSubmodule != null)
                {
                    flick.track = track;
                    flick.trackPositioner = flick.AddComponent<SplinePositioner>();
                    flick.trackPositioner.spline = track.trackPathSubmodule.path;
                    flick.isOnTrack = true;
                    flick.UpdateNoteInTrack();
                }
                else
                {
                    throw new System.Exception("如果Note要生成在Track上，Track必须有TrackTimeSubmodule组件。");
                }
            }
            else
            {
                flick.track = null;
                flick.isOnTrack = false;
            }

            return flick;
        }

        protected override void Update()
        {
            float songTime = GameManager.instance.songTime;

            if (!isFirstJudged && !isDuringJudging &&
                songTime >= exactJudgeTime + judgeIntervals.beforeMiss.intervalStart &&
                !GameManager.instance.inputManager.checkingFlickList.Contains(this))
            {
                isDuringJudging = true;
                GameManager.instance.inputManager.checkingFlickList.Add(this);
            }
            
            base.Update();
        }
        
        protected override void RemoveFromCheckingList()
        {
            GameManager.instance.inputManager.checkingFlickList.Remove(this);
        }
        
        public override void ExecuteStartJudge()
        {
            base.ExecuteStartJudge();

            isFinalJudged = true;
            
            if (GameManager.instance.inputManager.checkingFlickList.Contains(this))
            {
                GameManager.instance.inputManager.checkingFlickList.Remove(this);
            }
        }
    }

    public partial class Flick
    {
        public bool CheckJudgeAvailability(InputUnitSwipe inputUnitSwipe)
        {
            return noteJudgeSubmodule.judgeUnitList.All(judgeUnit => judgeUnit.CheckJudgeAvailability(inputUnitSwipe));
        }

        public bool CheckSwipeDirection(Vector2 screenSwipeDirection)
        {
            Camera gameCamera = GameManager.instance.cameraManager.gameCamera.gameCamera;
            
            foreach (Vector2 localDir in availableFlickDirections)
            {
                Vector3 worldDirection = noteVisual.transform.TransformDirection(localDir.normalized);
                Vector3 noteOriginWorld = noteVisual.transform.position;
                Vector3 noteTargetWorld = noteOriginWorld + worldDirection;

                Vector3 screenOrigin = gameCamera.WorldToScreenPoint(noteOriginWorld);
                Vector3 screenTarget = gameCamera.WorldToScreenPoint(noteTargetWorld);
            
                Vector2 noteScreenDirection = new Vector2(screenTarget.x - screenOrigin.x, screenTarget.y - screenOrigin.y).normalized;
                
                if (noteScreenDirection.sqrMagnitude < 0.01f)
                {
                    continue;
                }
                
                float dotProduct = Vector2.Dot(screenSwipeDirection, noteScreenDirection);

                // 4. 检查点积是否满足阈值
                if (dotProduct >= flickBuffer)
                {
                    // 匹配成功！无需再检查其他方向。
                    Debug.Log($"匹配成功! 输入方向 {screenSwipeDirection} 匹配了本地方向 {localDir} (屏幕投影: {noteScreenDirection}), 点积: {dotProduct}");
                    return true;
                }
            }
            
            Debug.Log($"匹配失败. 输入方向 {screenSwipeDirection} 未匹配任何允许的方向。");
            return false;
        }
    }

    public partial class Flick
    {
        public override void SetDefaultSubmodules()
        {
            base.SetDefaultSubmodules();
            noteAudioSubmodule = new NoteAudioSubmodule(this, "DefaultStay");
        }

        public override void SaveBM()
        {
            matchedBM = new Flick_BM(elementName, elementGuid, tags, parentElement.matchedBM as GameElement_BM, 
                exactJudgeTime, availableFlickDirections);
        }
    }

    namespace Beatmap
    {
        public class Flick_BM : NoteBase_BM
        {
            public List<Vector2> availableFlickDirections;

            public Flick_BM()
            {

            }

            public Flick_BM(string elementName, Guid elementGuid, List<string> tags, GameElement_BM attachedElement,
                float exactJudgeTime,
                List<Vector2> directions) : base(elementName, elementGuid, tags, attachedElement, exactJudgeTime)
            {
                availableFlickDirections = directions;
            }

            public override void ExecuteBM()
            {
                matchedElement = Flick.GenerateElement(elementName, elementGuid, tags, false,
                    GetElement(attachedElementGuid), exactJudgeTime, availableFlickDirections);
            }

            public override GameElement DuplicateBM(GameElement parent)
            {
                return Flick.GenerateElement(elementName, Guid.NewGuid(), tags, false, parent, 
                    exactJudgeTime, availableFlickDirections);
            }
        }
    }
}