using System;
using UnityEngine;

namespace AibisDream.FixSystem
{
    public class WaveSlider : MonoBehaviour
    {
        private OscilloscopeSystem _oscilloscopeSystem;
        private OscilloscopeSystem OscilloscopeSystem
        {
            get
            {
                if (!_oscilloscopeSystem)
                {
                    _oscilloscopeSystem = FixSystemCenter.SystemDic.Get<OscilloscopeSystem>();
                }

                return _oscilloscopeSystem;
            }
        }

        private Transform _slider; // 滑块的 Transform

        private Vector2 _startPos;
        private Vector2 _endPos;
        
        public float Value { get; private set; }

        private void Awake()
        {
            InitComponentsRef();
        }

        private void InitComponentsRef()
        {
            _slider = transform.Find("Sliding Block");
            var startTrans = transform.Find("Slider Start Pos");
            var endTrans = transform.Find("Slider End Pos");

            _startPos = new Vector2(startTrans.position.x, startTrans.position.y);
            _endPos = new Vector2(endTrans.position.x, endTrans.position.y);
        }

        public void InitSlider()
        {
            _slider.position = new Vector3(_startPos.x, _startPos.y, _slider.position.z);
        }

        private void Update()
        {
            if (OscilloscopeSystem.isScanning) return;
            
            if (Input.GetMouseButton(0))
            {
                Vector2 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
                var clampedX = Mathf.Clamp(mousePos.x, _startPos.x, _endPos.x);
                _slider.position = new Vector3(clampedX, _slider.position.y, _slider.position.z);

                // 计算滑块在轨道上的比例
                var curValue = (clampedX - _startPos.x) / (_endPos.x - _startPos.x);
                UpdateValue(curValue);
            }
        }

        private void UpdateValue(float curValue)
        {
            if (!Mathf.Approximately(curValue, Value))
            {
                // 如果相位有更新，就同步给波形
                OscilloscopeSystem.AdjustPhaseShift(curValue);
                Value = curValue;
            }
        }
    }
}