using UnityEngine;
using PlanarReflections5;

/// <summary>
/// NiloToon Environment 셰이더와 PIDI Planar Reflections 5를 연동하는 브리지 스크립트
/// </summary>
[System.Serializable]
public class NiloToonReflectionSettings
{
    [Header("Reflection Control")]
    [Range(0f, 1f)]
    public float reflectionIntensity = 1.0f;
    
    [ColorUsage(false)]
    public Color reflectionTintColor = Color.white;
    
    [Range(0.1f, 5f)]
    public float fresnelPower = 1.5f;
    
    [Range(0f, 0.1f)]
    public float distortionStrength = 0.02f;
    
    [Range(0f, 10f)]
    public float depthFade = 1.0f;
    
    [Range(0f, 2f)]
    public float blurRadius = 0.5f;
    
    [Header("Advanced")]
    public bool enableReflection = true;
    public bool useDepthFade = false;
    public LayerMask reflectionLayers = -1;
}

[RequireComponent(typeof(PlanarReflectionRenderer))]
public class NiloToonPlanarReflectionBridge : MonoBehaviour
{
    [Header("NiloToon Integration Settings")]
    public NiloToonReflectionSettings reflectionSettings = new NiloToonReflectionSettings();
    
    [Header("Shader Keywords")]
    [SerializeField] private bool enableReflectionDepthFade = false;
    
    private PlanarReflectionRenderer planarRenderer;
    private Camera[] monitoredCameras;
    
    // 셰이더 프로퍼티 IDs (성능 최적화)
    private static readonly int EnablePlanarReflectionID = Shader.PropertyToID("_EnablePlanarReflection");
    private static readonly int ReflectionIntensityID = Shader.PropertyToID("_ReflectionIntensity");
    private static readonly int ReflectionTintColorID = Shader.PropertyToID("_ReflectionTintColor");
    private static readonly int ReflectionFresnelID = Shader.PropertyToID("_ReflectionFresnel");
    private static readonly int ReflectionDistortionID = Shader.PropertyToID("_ReflectionDistortion");
    private static readonly int ReflectionDepthFadeID = Shader.PropertyToID("_ReflectionDepthFade");
    private static readonly int ReflectionBlurRadiusID = Shader.PropertyToID("_ReflectionBlurRadius");
    
    private void Awake()
    {
        planarRenderer = GetComponent<PlanarReflectionRenderer>();
        if (planarRenderer == null)
        {
            Debug.LogError("NiloToonPlanarReflectionBridge requires PlanarReflectionRenderer component!");
            enabled = false;
            return;
        }
    }
    
    private void Start()
    {
        // 초기 설정 적용
        UpdateShaderProperties();
        UpdateShaderKeywords();
    }
    
    private void Update()
    {
        // 실시간으로 셰이더 프로퍼티 업데이트
        UpdateShaderProperties();
        
        // 카메라 변경 감지 및 업데이트
        if (monitoredCameras == null || monitoredCameras.Length != Camera.allCamerasCount)
        {
            UpdateCameraReferences();
        }
    }
    
    private void UpdateShaderProperties()
    {
        // Global 셰이더 프로퍼티 업데이트
        Shader.SetGlobalFloat(EnablePlanarReflectionID, reflectionSettings.enableReflection ? 1.0f : 0.0f);
        Shader.SetGlobalFloat(ReflectionIntensityID, reflectionSettings.reflectionIntensity);
        Shader.SetGlobalVector(ReflectionTintColorID, new Vector4(
            reflectionSettings.reflectionTintColor.r,
            reflectionSettings.reflectionTintColor.g,
            reflectionSettings.reflectionTintColor.b,
            reflectionSettings.reflectionTintColor.a));
        Shader.SetGlobalFloat(ReflectionFresnelID, reflectionSettings.fresnelPower);
        Shader.SetGlobalFloat(ReflectionDistortionID, reflectionSettings.distortionStrength);
        Shader.SetGlobalFloat(ReflectionDepthFadeID, reflectionSettings.depthFade);
        Shader.SetGlobalFloat(ReflectionBlurRadiusID, reflectionSettings.blurRadius);
    }
    
    private void UpdateShaderKeywords()
    {
        // 셰이더 키워드 업데이트
        if (enableReflectionDepthFade && reflectionSettings.useDepthFade)
        {
            Shader.EnableKeyword("_REFLECTION_DEPTH_FADE");
        }
        else
        {
            Shader.DisableKeyword("_REFLECTION_DEPTH_FADE");
        }
    }
    
    private void UpdateCameraReferences()
    {
        monitoredCameras = new Camera[Camera.allCamerasCount];
        Camera.GetAllCameras(monitoredCameras);
        
        // Planar Reflection 설정을 카메라별로 동기화
        if (planarRenderer != null && planarRenderer.Settings != null)
        {
            planarRenderer.Settings.reflectLayers = reflectionSettings.reflectionLayers;
            planarRenderer.Settings.renderDepth = reflectionSettings.useDepthFade;
        }
    }
    
    /// <summary>
    /// 특정 재질에 반사 설정을 적용합니다.
    /// </summary>
    /// <param name="material">적용할 재질</param>
    public void ApplyToMaterial(Material material)
    {
        if (material == null) return;
        
        material.SetFloat(EnablePlanarReflectionID, reflectionSettings.enableReflection ? 1.0f : 0.0f);
        material.SetFloat(ReflectionIntensityID, reflectionSettings.reflectionIntensity);
        material.SetVector(ReflectionTintColorID, new Vector4(
            reflectionSettings.reflectionTintColor.r,
            reflectionSettings.reflectionTintColor.g,
            reflectionSettings.reflectionTintColor.b,
            reflectionSettings.reflectionTintColor.a));
        material.SetFloat(ReflectionFresnelID, reflectionSettings.fresnelPower);
        material.SetFloat(ReflectionDistortionID, reflectionSettings.distortionStrength);
        material.SetFloat(ReflectionDepthFadeID, reflectionSettings.depthFade);
        material.SetFloat(ReflectionBlurRadiusID, reflectionSettings.blurRadius);
        
        // 키워드 설정
        if (enableReflectionDepthFade && reflectionSettings.useDepthFade)
        {
            material.EnableKeyword("_REFLECTION_DEPTH_FADE");
        }
        else
        {
            material.DisableKeyword("_REFLECTION_DEPTH_FADE");
        }
    }
    
    /// <summary>
    /// 씬의 모든 NiloToon Environment 재질에 설정을 적용합니다.
    /// </summary>
    public void ApplyToAllNiloToonMaterials()
    {
        Renderer[] renderers = FindObjectsOfType<Renderer>();
        foreach (Renderer renderer in renderers)
        {
            foreach (Material mat in renderer.materials)
            {
                // NiloToon Environment 셰이더인지 확인 (이름으로 판별)
                if (mat.shader.name.Contains("NiloToon") && mat.shader.name.Contains("Environment"))
                {
                    ApplyToMaterial(mat);
                }
            }
        }
    }
    
    private void OnValidate()
    {
        // Inspector에서 값이 변경될 때 실시간 업데이트
        if (Application.isPlaying)
        {
            UpdateShaderProperties();
            UpdateShaderKeywords();
        }
    }
    
    #if UNITY_EDITOR
    [UnityEditor.MenuItem("Tools/NiloToon/Create Planar Reflection Bridge")]
    private static void CreateBridge()
    {
        GameObject bridge = new GameObject("NiloToon Planar Reflection Bridge");
        bridge.AddComponent<PlanarReflectionRenderer>();
        bridge.AddComponent<NiloToonPlanarReflectionBridge>();
        
        UnityEditor.Selection.activeGameObject = bridge;
        UnityEditor.EditorGUIUtility.PingObject(bridge);
        
        Debug.Log("NiloToon Planar Reflection Bridge가 생성되었습니다!");
    }
    #endif
}