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

namespace Ichni.RhythmGame
{
    public class TouchAreaJudgeUnit : NoteJudgeUnit
    {
        #region [暴露属性字段] Properties
        public float ellipseXMultiplier = 1.25f; 
        public float ellipseYMultiplier = 1.0f;
        public float areaRadius;

        private static float CurrentScreenRatio => Screen.height / 1080f; // 以1080p为基准的屏幕缩放比例
        #endregion

        #region [初始化] Initialization
        public TouchAreaJudgeUnit(NoteBase note, float areaRadius) : base(note)
        {
            this.areaRadius = areaRadius;
        }
        #endregion

        #region [判定逻辑覆盖] Judge Overrides
        protected override GameObject GetHintImagePrefab()
        {
            return GameManager.Instance.basePrefabs.areaHint;
        }

        public override void UpdateJudge()
        {
            if ((note is not Hold && note.isFirstJudged)||(note is Hold && note.isFinalJudged)) return;
            Vector2 noteScreenPosition = note.noteScreenPosition;
            RectTransform canvasRect = GameManager.Instance.judgeHintCanvas.GetComponent<RectTransform>();
            if (RectTransformUtility.ScreenPointToLocalPointInRectangle(canvasRect, noteScreenPosition, null, out Vector2 uiPosition))
            {
                judgeHintImage.anchoredPosition = uiPosition;
                judgeHintImage.sizeDelta = new Vector2(areaRadius * 2 * ellipseXMultiplier, areaRadius * 2 * ellipseYMultiplier) * CurrentScreenRatio;
            }
        }

        public override bool CheckJudgeAvailability(InputUnit inputUnit)
        {
            Vector2 inputScreenPosition = inputUnit.inputPosition;
            Vector2 noteScreenPosition = note.GetScreenPosition();
            float scaledBaseRadius = areaRadius * CurrentScreenRatio;
            
            float dx = Mathf.Abs(inputScreenPosition.x - noteScreenPosition.x) / ellipseXMultiplier;
            float dy = Mathf.Abs(inputScreenPosition.y - noteScreenPosition.y) / ellipseYMultiplier;

            if ((dx * dx) + (dy * dy) <= (scaledBaseRadius * scaledBaseRadius))
            {
                if (inputUnit is InputUnitSwipe swipe && note is Flick flick)
                {
                    return flick.CheckSwipeDirection(swipe);
                }
                return true;
            }
            
            return false;
        }
        #endregion

    }

}