using System;
using Games.Events;
using Module.Log;
using UnityEngine;

public class FogDensityLerp : MonoBehaviour
{
    private static bool _usingFogLerp;
    private FogSettingData _baseFogSettings;
    private bool _isCurrent;
    public FogSettingData maxFogSettings;
    public float maxHeight = 20f;
    public float minHeight = 10f;

    private void LateUpdate()
    {
        var mainPlayer = ObjManager.Instance.MainPlayer;
        if (mainPlayer != null)
        {
            var ratio = Mathf.Clamp01((mainPlayer.Position.y - minHeight) / (maxHeight - minHeight));
            _baseFogSettings.Lerp(maxFogSettings, ratio);
        }
    }

    private void Awake()
    {
        if (_usingFogLerp)
        {
            LogModule.ErrorLog(string.Format("发现重复的雾效密度调节器，于物体{0}", transform.GetHierarchyName()));
            enabled = false;
        }
        else
        {
            _usingFogLerp = true;
            _isCurrent = true;
            LogModule.WarningLog(string.Format("当前场景使用雾效密度调节器进行雾效调节，于物体{0}", transform.GetHierarchyName()));
        }
    }

    // 注：如果编辑器中Awake不成功，则不会出现Start效果
    private void Start()
    {
        if (_isCurrent)
        {
            _baseFogSettings = new FogSettingData();
            _baseFogSettings.Read();
            EventDispatcher.Instance.Add(Games.Events.EventId.FogSettingUpdate, OnFogSettingUpdate);
            OnFogSettingUpdate(null);
        }
    }

    private void OnFogSettingUpdate(object args)
    {
        enabled = PlayerPreferenceData.SystemQualityFog;
    }

    private void OnDestroy()
    {
        if (_isCurrent)
        {
            _usingFogLerp = false;
            _baseFogSettings.Write();
        }
        EventDispatcher.Instance.Remove(Games.Events.EventId.FogSettingUpdate, OnFogSettingUpdate);
    }

    [Serializable]
    public class FogSettingData
    {
        public float density;
        public float endDistance;
        public float startDistance;

        public void Read()
        {
            startDistance = RenderSettings.fogStartDistance;
            endDistance = RenderSettings.fogEndDistance;
            density = RenderSettings.fogDensity;
        }

        public void Write()
        {
            RenderSettings.fogStartDistance = startDistance;
            RenderSettings.fogEndDistance = endDistance;
            RenderSettings.fogDensity = density;
        }

        public void Lerp(FogSettingData other, float ratio)
        {
            RenderSettings.fogStartDistance = Mathf.Lerp(startDistance, other.startDistance, ratio);
            RenderSettings.fogEndDistance = Mathf.Lerp(endDistance, other.endDistance, ratio);
            RenderSettings.fogDensity = Mathf.Lerp(density, other.density, ratio);
        }
    }
}