using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.SceneManagement;

namespace Streamingle.Background.Editor
{
    /// <summary>
    /// 배경 씬에서 라이팅 세팅을 복사해오는 유틸리티
    /// </summary>
    public static class BackgroundLightingCopier
    {
        /// <summary>
        /// 소스 씬에서 타겟 씬으로 라이팅 세팅 복사
        /// </summary>
        public static void CopyLightingSettings(Scene sourceScene, Scene targetScene)
        {
            if (!sourceScene.isLoaded || !targetScene.isLoaded)
            {
                UnityEngine.Debug.LogWarning("소스 씬 또는 타겟 씬이 로드되지 않았습니다.");
                return;
            }

            // 1. Environment 설정 복사 (Skybox, Ambient, Fog 등)
            CopyEnvironmentSettings();

            // 2. 소스 씬의 라이트들을 타겟 씬으로 복사
            CopyLights(sourceScene, targetScene);

            // 3. Reflection Probe 복사
            CopyReflectionProbes(sourceScene, targetScene);

            // 4. Light Probe Group 복사
            CopyLightProbeGroups(sourceScene, targetScene);

            // 5. Volume (Post Processing) 복사
            CopyVolumes(sourceScene, targetScene);

            UnityEngine.Debug.Log($"라이팅 세팅 복사 완료: {sourceScene.name} → {targetScene.name}");
        }

        /// <summary>
        /// 현재 활성 씬에 배경 씬의 라이팅 적용
        /// </summary>
        public static void ApplyLightingFromBackgroundScene(Scene backgroundScene)
        {
            if (!backgroundScene.isLoaded)
            {
                UnityEngine.Debug.LogWarning("배경 씬이 로드되지 않았습니다.");
                return;
            }

            // Environment 설정 복사
            CopyEnvironmentSettingsFromScene(backgroundScene);

            UnityEngine.Debug.Log($"라이팅 세팅 적용됨: {backgroundScene.name}");
        }

        private static void CopyEnvironmentSettings()
        {
            // RenderSettings는 현재 활성 씬에 적용됨
            // Lighting Window에서 설정하는 것들
        }

        private static void CopyEnvironmentSettingsFromScene(Scene sourceScene)
        {
            // 소스 씬을 활성 씬으로 설정하여 RenderSettings 가져오기
            var previousActiveScene = SceneManager.GetActiveScene();

            // 소스 씬에서 Environment 관련 오브젝트 찾기
            var rootObjects = sourceScene.GetRootGameObjects();

            foreach (var obj in rootObjects)
            {
                // Directional Light (Sun) 찾기
                var lights = obj.GetComponentsInChildren<Light>(true);
                foreach (var light in lights)
                {
                    if (light.type == LightType.Directional)
                    {
                        // Sun Source로 설정
                        RenderSettings.sun = light;
                        break;
                    }
                }

                // Volume 찾기 (Global Volume의 경우 환경 설정 포함)
                var volumes = obj.GetComponentsInChildren<Volume>(true);
                foreach (var volume in volumes)
                {
                    if (volume.isGlobal && volume.sharedProfile != null)
                    {
                        // Global Volume의 프로파일에서 환경 설정 복사 가능
                    }
                }
            }
        }

        private static void CopyLights(Scene sourceScene, Scene targetScene)
        {
            var sourceRoots = sourceScene.GetRootGameObjects();
            var lightsContainer = GetOrCreateLightingContainer(targetScene, "Background Lights");

            foreach (var root in sourceRoots)
            {
                var lights = root.GetComponentsInChildren<Light>(true);
                foreach (var light in lights)
                {
                    // 라이트 복제
                    var newLightObj = Object.Instantiate(light.gameObject, lightsContainer.transform);
                    newLightObj.name = $"[BG] {light.gameObject.name}";

                    // 씬 이동
                    SceneManager.MoveGameObjectToScene(newLightObj, targetScene);
                }
            }
        }

        private static void CopyReflectionProbes(Scene sourceScene, Scene targetScene)
        {
            var sourceRoots = sourceScene.GetRootGameObjects();
            var container = GetOrCreateLightingContainer(targetScene, "Background ReflectionProbes");

            foreach (var root in sourceRoots)
            {
                var probes = root.GetComponentsInChildren<ReflectionProbe>(true);
                foreach (var probe in probes)
                {
                    var newProbeObj = Object.Instantiate(probe.gameObject, container.transform);
                    newProbeObj.name = $"[BG] {probe.gameObject.name}";
                    SceneManager.MoveGameObjectToScene(newProbeObj, targetScene);
                }
            }
        }

        private static void CopyLightProbeGroups(Scene sourceScene, Scene targetScene)
        {
            var sourceRoots = sourceScene.GetRootGameObjects();
            var container = GetOrCreateLightingContainer(targetScene, "Background LightProbes");

            foreach (var root in sourceRoots)
            {
                var groups = root.GetComponentsInChildren<LightProbeGroup>(true);
                foreach (var group in groups)
                {
                    var newGroupObj = Object.Instantiate(group.gameObject, container.transform);
                    newGroupObj.name = $"[BG] {group.gameObject.name}";
                    SceneManager.MoveGameObjectToScene(newGroupObj, targetScene);
                }
            }
        }

        private static void CopyVolumes(Scene sourceScene, Scene targetScene)
        {
            var sourceRoots = sourceScene.GetRootGameObjects();
            var container = GetOrCreateLightingContainer(targetScene, "Background Volumes");

            foreach (var root in sourceRoots)
            {
                var volumes = root.GetComponentsInChildren<Volume>(true);
                foreach (var volume in volumes)
                {
                    var newVolumeObj = Object.Instantiate(volume.gameObject, container.transform);
                    newVolumeObj.name = $"[BG] {volume.gameObject.name}";
                    SceneManager.MoveGameObjectToScene(newVolumeObj, targetScene);
                }
            }
        }

        private static GameObject GetOrCreateLightingContainer(Scene scene, string name)
        {
            var roots = scene.GetRootGameObjects();

            // 기존 컨테이너 찾기
            foreach (var root in roots)
            {
                if (root.name == name)
                {
                    // 기존 자식들 제거
                    while (root.transform.childCount > 0)
                    {
                        Object.DestroyImmediate(root.transform.GetChild(0).gameObject);
                    }
                    return root;
                }
            }

            // 새 컨테이너 생성
            var container = new GameObject(name);
            SceneManager.MoveGameObjectToScene(container, scene);
            return container;
        }

        /// <summary>
        /// 타겟 씬에서 복사된 라이팅 오브젝트들 제거
        /// </summary>
        public static void RemoveCopiedLighting(Scene targetScene)
        {
            var roots = targetScene.GetRootGameObjects();
            var toRemove = new List<GameObject>();

            foreach (var root in roots)
            {
                if (root.name.StartsWith("Background ") ||
                    root.name.StartsWith("[BG]"))
                {
                    toRemove.Add(root);
                }
            }

            foreach (var obj in toRemove)
            {
                Object.DestroyImmediate(obj);
            }

            UnityEngine.Debug.Log($"복사된 라이팅 오브젝트 제거됨: {toRemove.Count}개");
        }

        /// <summary>
        /// 배경 씬의 Skybox Material 가져오기
        /// </summary>
        public static Material GetSkyboxFromScene(Scene scene)
        {
            var roots = scene.GetRootGameObjects();

            foreach (var root in roots)
            {
                // Skybox 컴포넌트가 있는 카메라 찾기
                var cameras = root.GetComponentsInChildren<Camera>(true);
                foreach (var cam in cameras)
                {
                    var skybox = cam.GetComponent<Skybox>();
                    if (skybox != null && skybox.material != null)
                    {
                        return skybox.material;
                    }
                }
            }

            return null;
        }

        /// <summary>
        /// RenderSettings 전체 복사 (Skybox, Ambient, Fog 등)
        /// </summary>
        public static void ApplyRenderSettings(
            Material skybox = null,
            AmbientMode? ambientMode = null,
            Color? ambientLight = null,
            bool? fog = null,
            Color? fogColor = null,
            float? fogDensity = null)
        {
            if (skybox != null)
                RenderSettings.skybox = skybox;

            if (ambientMode.HasValue)
                RenderSettings.ambientMode = ambientMode.Value;

            if (ambientLight.HasValue)
                RenderSettings.ambientLight = ambientLight.Value;

            if (fog.HasValue)
                RenderSettings.fog = fog.Value;

            if (fogColor.HasValue)
                RenderSettings.fogColor = fogColor.Value;

            if (fogDensity.HasValue)
                RenderSettings.fogDensity = fogDensity.Value;
        }
    }
}