using UnityEngine;
using UnityEngine.Profiling;

namespace TracyProfiler
{
    /// <summary>
    /// Tracy 管理器 - 负责初始化和每帧更新
    /// 在场景中添加此组件以启用 Tracy 性能分析
    /// </summary>
    [DefaultExecutionOrder(-9999)] // 确保最早执行
    public class TracyManager : MonoBehaviour
    {
        [Header("Tracy 设置")]
        [Tooltip("启动时自动初始化 Tracy")]
        [SerializeField] private bool enableOnStart = true;

        [Tooltip("每帧自动标记帧边界")]
        [SerializeField] private bool markFrames = true;

        [Header("性能监控")]
        [Tooltip("监控帧率和帧时间")]
        [SerializeField] private bool monitorFrameRate = true;

        [Tooltip("监控内存使用")]
        [SerializeField] private bool monitorMemory = true;

        [Tooltip("监控渲染统计")]
        [SerializeField] private bool monitorRendering = true;

        [Tooltip("监控物理系统")]
        [SerializeField] private bool monitorPhysics = true;

        [Header("高级选项")]
        [Tooltip("在编辑器中也启用 Tracy")]
        [SerializeField] private bool enableInEditor = true;

        [Tooltip("显示调试信息")]
        [SerializeField] private bool showDebugInfo = false;

        private static TracyManager instance;

        public static TracyManager Instance => instance;

        private void Awake()
        {
            // 单例模式
            if (instance != null && instance != this)
            {
                Debug.LogWarning("[Tracy] 检测到多个 TracyManager 实例，销毁多余的实例");
                Destroy(gameObject);
                return;
            }

            instance = this;
            DontDestroyOnLoad(gameObject);

            // 编辑器检查
            if (!Application.isPlaying)
                return;

#if UNITY_EDITOR
            if (!enableInEditor)
            {
                Debug.Log("[Tracy] 编辑器模式下已禁用");
                return;
            }
#endif

            // 初始化 Tracy
            if (enableOnStart)
            {
                Tracy.Initialize();
                
                if (Tracy.IsInitialized)
                {
                    Tracy.Message("Unity Application Started");
                    Tracy.SetThreadName("Main Thread");
                    
                    if (showDebugInfo)
                    {
                        LogSystemInfo();
                    }
                }
            }
        }

        private void Update()
        {
            using (Tracy.Zone("TracyManager.Update"))
            {
                // 监控帧率
                if (monitorFrameRate)
                {
                    MonitorFrameRate();
                }

                // 监控内存
                if (monitorMemory)
                {
                    MonitorMemory();
                }
            }
        }

        private void LateUpdate()
        {
            using (Tracy.Zone("TracyManager.LateUpdate"))
            {
                // 在每帧末尾标记帧边界
                if (markFrames)
                {
                    Tracy.MarkFrame();
                }

                // 监控渲染统计
                if (monitorRendering)
                {
                    MonitorRendering();
                }
            }
        }

        private void FixedUpdate()
        {
            using (Tracy.Zone("TracyManager.FixedUpdate"))
            {
                // 监控物理系统
                if (monitorPhysics)
                {
                    MonitorPhysics();
                }
            }
        }

        private void OnDestroy()
        {
            if (instance == this)
            {
                Tracy.Message("Unity Application Shutting Down");
                Tracy.Shutdown();
                instance = null;
            }
        }

        private void OnApplicationQuit()
        {
            Tracy.Message("Unity Application Quit");
            Tracy.Shutdown();
        }

        private void OnApplicationPause(bool pauseStatus)
        {
            if (pauseStatus)
            {
                Tracy.Message("Application Paused");
            }
            else
            {
                Tracy.Message("Application Resumed");
            }
        }

        #region Performance Monitoring

        private void MonitorFrameRate()
        {
            float fps = 1.0f / Time.unscaledDeltaTime;
            float frameTime = Time.unscaledDeltaTime * 1000.0f;

            Tracy.Plot("FPS", fps);
            Tracy.Plot("Frame Time (ms)", frameTime);
            Tracy.Plot("Time Scale", Time.timeScale);
        }

        private void MonitorMemory()
        {
            // GC 内存
            long totalMemory = System.GC.GetTotalMemory(false);
            Tracy.Plot("GC Memory (MB)", totalMemory / (1024.0 * 1024.0));

            // Unity Profiler 内存统计
            long usedHeap = Profiler.usedHeapSizeLong;
            long totalAllocated = Profiler.GetTotalAllocatedMemoryLong();
            long totalReserved = Profiler.GetTotalReservedMemoryLong();

            Tracy.Plot("Used Heap (MB)", usedHeap / (1024.0 * 1024.0));
            Tracy.Plot("Total Allocated (MB)", totalAllocated / (1024.0 * 1024.0));
            Tracy.Plot("Total Reserved (MB)", totalReserved / (1024.0 * 1024.0));

            // 纹理内存
            Tracy.Plot("Texture Memory (MB)", Profiler.GetAllocatedMemoryForGraphicsDriver() / (1024.0 * 1024.0));
        }

        private void MonitorRendering()
        {
            // 渲染统计
            Tracy.Plot("SetPass Calls", Profiler.GetRuntimeMemorySizeLong(null));
            Tracy.Plot("Draw Calls", UnityEngine.Rendering.FrameTimingManager.GetLatestTimings(1, null));
            Tracy.Plot("Triangles", 0); // 需要通过 Stats 获取
            Tracy.Plot("Vertices", 0);   // 需要通过 Stats 获取
        }

        private void MonitorPhysics()
        {
            // 物理对象计数
            int rigidbodyCount = FindObjectsOfType<Rigidbody>().Length;
            int colliderCount = FindObjectsOfType<Collider>().Length;

            Tracy.Plot("Rigidbody Count", rigidbodyCount);
            Tracy.Plot("Collider Count", colliderCount);
        }

        private void LogSystemInfo()
        {
            Tracy.Message($"Device: {SystemInfo.deviceModel}");
            Tracy.Message($"OS: {SystemInfo.operatingSystem}");
            Tracy.Message($"CPU: {SystemInfo.processorType} ({SystemInfo.processorCount} cores)");
            Tracy.Message($"Memory: {SystemInfo.systemMemorySize} MB");
            Tracy.Message($"GPU: {SystemInfo.graphicsDeviceName}");
            Tracy.Message($"Graphics API: {SystemInfo.graphicsDeviceType}");
            Tracy.Message($"Unity Version: {Application.unityVersion}");
        }

        #endregion

        #region Public API

        /// <summary>
        /// 手动触发帧标记（如果禁用了自动标记）
        /// </summary>
        public void ManualFrameMark()
        {
            Tracy.MarkFrame();
        }

        /// <summary>
        /// 发送自定义消息
        /// </summary>
        public void SendMessage(string message)
        {
            Tracy.Message(message);
        }

        /// <summary>
        /// 绘制自定义数值
        /// </summary>
        public void PlotValue(string name, double value)
        {
            Tracy.Plot(name, value);
        }

        #endregion

#if UNITY_EDITOR
        private void OnValidate()
        {
            // 在编辑器中修改参数时的验证
            if (!Application.isPlaying)
                return;

            if (enableOnStart && !Tracy.IsInitialized)
            {
                Tracy.Initialize();
            }
        }
#endif
    }
}