using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Threading;
using UnityEngine;
using UnityEngine.Android;

namespace SmartBowSDK.CMD
{
    public class CMDManager
    {
        // ---- GC 防止回调被销毁 ----
        private CMDScannerCallbackProxy scannerProxy;
        private CMDBleCallbackProxy bleCallbackProxy;

        private string pendingScanPattern = null;

        public event Action<string, string> OnCMDDeviceFound;
        public event Action<CMDScanState,string> OnCMDScanFailed;

        public event Action OnCMDBLEConnected;
        public event Action OnCMDBLEDisconnected;
        public event Action OnCMDBLEReady;
        public event Action<byte[]> OnCMDBLENotify;

        public event Action<string> OnPermissionDenied;     // 某权限被拒绝
        public event Action<string> OnPermissionDontAsk;   // 被永久拒绝

        //public int scanTimeout = 10;    // 传超时 ，默认10秒
        // Android 12+
        private readonly string[] BLE_PERMISSIONS_31 =
        {
            "android.permission.BLUETOOTH_SCAN",
            "android.permission.BLUETOOTH_CONNECT"
        };

        // Android 6~11
        private readonly string[] BLE_PERMISSIONS =
        {
            Permission.FineLocation
        };


        // ----------- 统一复用对象 -----------
        private AndroidJavaObject unityActivity;     // currentActivity
        private AndroidJavaClass bleManagerClass;    // CMDBleManager.class
        private AndroidJavaObject bleManagerInst;    // CMDBleManager.getInstance()
        private AndroidJavaClass transparentProxyActivityClass;    // CMDBleManager.class


        // ========= 队列 & 后台解析线程 =========
        private readonly ConcurrentQueue<byte[]> notifyQueue = new ConcurrentQueue<byte[]>();
        private readonly AutoResetEvent notifyEvent = new AutoResetEvent(false);
        private Thread notifyWorker;
        private volatile bool notifyWorkerRunning = false;

        // 主线程派发节流：最多每 dispatchIntervalMs 毫秒派发一次到主线程
        private readonly int dispatchIntervalMs = 0; // 50 Hz 向主线程派发（可调）
        private long lastDispatchTime = 0;

        // -------- Constructor --------
        public CMDManager()
        {
            // 初始化统一复用对象 --------
            unityActivity = new AndroidJavaClass("com.unity3d.player.UnityPlayer")
                            .GetStatic<AndroidJavaObject>("currentActivity");

            //bleManagerClass = new AndroidJavaClass("com.ble.mycdmmanager.CMDBleManager");
            //bleManagerInst = bleManagerClass.CallStatic<AndroidJavaObject>("getInstance");
            bleManagerInst = new AndroidJavaObject(
                "com.ble.mycdmmanager.CMDBleManager",
                unityActivity  // 传 context
            );

            transparentProxyActivityClass = new AndroidJavaClass("com.ble.mycdmmanager.CMDTransparentProxyActivity");


            // BLE callback
            bleCallbackProxy = new CMDBleCallbackProxy();

            bleCallbackProxy.OnBLEConnectedEvent += () =>
                OnCMDBLEConnected?.Invoke();

            bleCallbackProxy.OnBLEDisconnectedEvent += () =>
                OnCMDBLEDisconnected?.Invoke();

            bleCallbackProxy.OnBLEReadyEvent += () =>
                OnCMDBLEReady?.Invoke();

            bleCallbackProxy.OnBLENotifyEvent += (mergedDataObj) =>
            {
                //SmartBowLogger.LogError(this, "[OnBLENotifyEvent]:"+ BitConverter.ToString(data));
                //long now = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(); 
                //SmartBowLogger.Log(this,$"[CMDBleManager→Unity] NotifyArrived | t={now} | size={data.Length}");
                //OnCMDBLENotify?.Invoke(data); // 实时调用
                // 快速入队（非阻塞）
                //EnqueueNotify(data);

               // --- 1. 使用 Buffer.BlockCopy 安全地将 JNI 数组转换为 C# byte[] ---
                if (!(mergedDataObj is Array sourceArray))
                {
                    Debug.LogError($"[CMDManager] JNI 回调期望一个数组，但接收到: {mergedDataObj?.GetType()}");
                    return;
                }

                int totalLen = sourceArray.Length;
                byte[] mergedData = new byte[totalLen];
                // BlockCopy 可以在 byte[] 和 sbyte[] 之间进行安全的原始内存复制
                System.Buffer.BlockCopy(sourceArray, 0, mergedData, 0, totalLen);

                // --- 2. 拆分多条数据 ---
                int index = 0;
                while (index + 2 <= mergedData.Length)
                {
                    // 确保 Java 和 C# 的字节序一致（您的代码使用了小端序 for BitConverter.ToUInt16）
                    ushort len = BitConverter.ToUInt16(mergedData, index);
                    index += 2;

                    if (index + len > mergedData.Length)
                    {
                        Debug.LogWarning("[CMDManager] 数据长度超出合并数组范围");
                        break;
                    }

                    byte[] singleData = new byte[len];
                    Array.Copy(mergedData, index, singleData, 0, len);
                    index += len;

                    // --- 3. 快速入队（非阻塞） ---
                    EnqueueNotify(singleData); // 使用您的高性能 C# 队列和后台线程
                }
            };

            // 启动主线程 dispatcher（如果未存在）
            MainThreadDispatcher.EnsureCreated();

            // 启动后台线程
            StartNotifyWorker();

            //bleManagerClass.CallStatic("setGlobalCMDBleCallback", bleCallbackProxy);
            bleManagerInst.Call("setCmdBleCallback", bleCallbackProxy);


        }
        /// <summary>
        /// 设置服务特征值
        /// </summary>
        /// <param name="service"></param>
        /// <param name="write"></param>
        /// <param name="notify"></param>
        public void SetUUIDs(string service, string write, string notify) {

            bleManagerInst.Call("setUUIDs",  service,  write, notify );

        }

        // -------- 权限处理 --------

        private string[] GetRequiredPermissions() =>
            GetAndroidSDKInt() >= 31 ? BLE_PERMISSIONS_31 : BLE_PERMISSIONS;

        private bool CheckAllBLEPermissions()
        {
            foreach (var p in GetRequiredPermissions())
            {
                if (!Permission.HasUserAuthorizedPermission(p))
                    return false;
            }
            return true;
        }

        private int GetAndroidSDKInt()
        {
            using (var v = new AndroidJavaClass("android.os.Build$VERSION"))
                return v.GetStatic<int>("SDK_INT");
        }

        private void RequestAllPermissions(Action onAllGranted)
        {
            var perms = GetRequiredPermissions();
            RequestPermissionRecursive(perms, 0, onAllGranted);
        }

        private void RequestPermissionRecursive(string[] perms, int index, Action onAllGranted)
        {
            if (index >= perms.Length)
            {
                onAllGranted?.Invoke();
                return;
            }

            string permission = perms[index];

            PermissionManager.Request(
                permission,
                onGranted: () =>
                {
                    // 继续请求下一项权限
                    RequestPermissionRecursive(perms, index + 1, onAllGranted);
                },
                onDenied: () =>
                {
                    Debug.LogError($"[CMDManager] 权限被拒绝：{permission}");

                    // ---- 调用事件 ----
                    OnPermissionDenied?.Invoke(permission);
                },
                onDontAsk: () =>
                {
                    Debug.LogError($"[CMDManager] 权限永久拒绝：{permission}");

                    // ---- 调用事件 ----
                    OnPermissionDontAsk?.Invoke(permission);
                }
            );
        }
        private void EnsureBLEPermissionThen(Action doWork)
        {
            if (CheckAllBLEPermissions())
            {
                doWork?.Invoke();
            }
            else
            {
                RequestAllPermissions(() =>
                {
                    doWork?.Invoke();
                });
            }
        }

        //     ---- 扫描入口 ----

        public void StartScan(string pattern)
        {
            pendingScanPattern = pattern;

            EnsureBLEPermissionThen(() =>
            {
                LaunchTransparentProxyScan(pendingScanPattern);
            });
        }


        // ---- 启动透明 Activity ----

        private void LaunchTransparentProxyScan(string pattern)
        {
            // Scanner Callback
            scannerProxy = new CMDScannerCallbackProxy();
            scannerProxy.OnDeviceFoundEvent = (name, mac) =>
            {
                //Debug.Log("[CMDManager] DeviceFound: " + name + " - " + mac);
                OnCMDDeviceFound?.Invoke(name, mac);
            };

            scannerProxy.OnScanFailedEvent = (state,reason) =>
            {
                //Debug.LogError("[CMDManager] ScanFailed: " + reason);
                OnCMDScanFailed?.Invoke(state,reason);
            };
            // ---- 设置静态回调 ----
            transparentProxyActivityClass.SetStatic("globalCMDScannerCallback", scannerProxy);
            // ---- 启动 Activity ----
            AndroidJavaObject intent = new AndroidJavaObject(
                "android.content.Intent",
                unityActivity,
                new AndroidJavaClass("com.ble.mycdmmanager.CMDTransparentProxyActivity")
            );
            //扫描设备名字字符串
            intent.Call<AndroidJavaObject>("putExtra", "pattern", pattern);
   
            //intent.Call<AndroidJavaObject>("putExtra", "timeout_sec", scanTimeout);

            //intent.Call<AndroidJavaObject>("addFlags", 0x10000000); // FLAG_ACTIVITY_NEW_TASK

            unityActivity.Call("startActivity", intent);
        }
        /// <summary>
        /// 通过 MAC 地址连接设备
        /// </summary>
        public bool ConnectMac(string mac)
        {
            if (string.IsNullOrEmpty(mac)) return false;

            bool result = false;

            EnsureBLEPermissionThen(() =>
            {
                result = bleManagerInst.Call<bool>("connectMac", mac);
            });

            return result;
        }

        /**
         * 断开cmd蓝牙连接
         */
        public void Disconnect()
        {
            try
            {
                bleManagerInst.Call("disconnect");
                //清空队列
                ClearNotifyQueue();
                SmartBowLogger.Log(this, "[CMDManager] Disconnect called (OK)");
            }
            catch (Exception e)
            {
                SmartBowLogger.LogError(this, "[CMDManager] Disconnect error: " + e);
            }
        }
        /**
         * 清空cmd manager
         */
        public void Cleanup()
        {
            try
            {
                SmartBowLogger.Log(this, "[CMDManager] <Disconnect> begin");

                // 1) 停 Worker
                StopNotifyWorker();

                // 2) 清空队列
                ClearNotifyQueue();

                // 3) 注销静态回调，避免旧 CMD 的 notify 残留
                //try
                //{
                //    // 移除 Scanner 回调
                //    transparentProxyActivityClass.SetStatic<AndroidJavaObject>("globalCMDScannerCallback", null);
                //    // 移除 BLE 回调
                //    bleManagerClass.CallStatic("setGlobalCMDBleCallback", null);

                //    SmartBowLogger.Log(this, "[CMDManager] static callbacks cleared");
                //}
                //catch (Exception ex)
                //{
                //    SmartBowLogger.LogError(this, "[CMDManager] clear static callback error：" + ex);
                //}

                // 4) 最后再断开 Android BLE
                bleManagerInst.Call("disconnect");

                SmartBowLogger.Log(this, "[CMDManager] Cleanup done");
            }
            catch (Exception e)
            {
                SmartBowLogger.LogError(this, "[CMDManager] Cleanup error: " + e);
            }
        }



        public bool SendCommand(string text)
        {
            if (string.IsNullOrWhiteSpace(text))
                return false;

            bool success;

            // 判断是否 HEX（01 02 03）
            if (System.Text.RegularExpressions.Regex.IsMatch(text, @"^([0-9A-Fa-f]{2}\s*)+$"))
            {
                byte[] bytes = ParseHexString(text);
                success = WriteBytes(bytes);
            }
            else
            {
                success = WriteString(text);
            }

            if (!success)
            {
                SmartBowLogger.LogError(this,"[CMDManager] Send failed, BLE not ready");
                return false;
            }

            SmartBowLogger.Log(this,"[CMDManager] Sent: " + text);
            return true;
        }

        public bool WriteString(string str)
        {
            try
            {
                return bleManagerInst.Call<bool>("writeString", str);
            }
            catch (System.Exception e)
            {
                SmartBowLogger.LogError(this,"[CMDManager] writeString error: " + e);
                return false;
            }

        }

        public bool WriteBytes(byte[] bytes)
        {
            try
            {
                return bleManagerInst.Call<bool>("writeBytes", bytes);
            }
            catch (System.Exception e)
            {
                SmartBowLogger.LogError(this,"[CMDManager] writeBytes error: " + e);
                return false;
            }
        }

        private byte[] ParseHexString(string hex)
        {
            try
            {
                string[] parts = hex.Trim().Split(' ');
                byte[] bytes = new byte[parts.Length];

                for (int i = 0; i < parts.Length; i++)
                {
                    bytes[i] = System.Convert.ToByte(parts[i], 16);
                }

                return bytes;
            }
            catch
            {
                return null;
            }
        }


        // -------- 队列入队（由 CMDBleCallbackProxy 调用） --------
        internal void EnqueueNotify(byte[] data)
        {
            if (data == null) return;
            notifyQueue.Enqueue(data);
            notifyEvent.Set(); // 唤醒后台线程
        }

        private void StartNotifyWorker()
        {
            if (notifyWorkerRunning) return;
            notifyWorkerRunning = true;
            notifyWorker = new Thread(NotifyWorkerLoop)
            {
                IsBackground = true,
                Name = "CMDManager-NotifyWorker",
                Priority = System.Threading.ThreadPriority.AboveNormal // 提升优先级
            };
            notifyWorker.Start();
        }

        private void StopNotifyWorker()
        {
            notifyWorkerRunning = false;
            notifyEvent.Set();
            try { notifyWorker?.Join(500); } catch { }
            notifyWorker = null;
        }
        private void ClearNotifyQueue()
        {
            while (notifyQueue.TryDequeue(out _)) ;
            SmartBowLogger.Log(this, "[CMDManager] NotifyQueue cleared");
        }
        private void NotifyWorkerLoop()
        {
            // 后台线程不断消费队列，尽快完成解析工作
            while (notifyWorkerRunning)
            {
                try
                {
                    // 等待直到有数据
                    if (!notifyQueue.TryDequeue(out var data))
                    {
                        // 等待唤醒或超时
                        notifyEvent.WaitOne(50);
                        continue;
                    }

                    // 处理单条数据（在后台线程）
                    ProcessNotifyBackground(data);

                    // 批量消费：尽可能多地一次性取完队列，以减少唤醒次数
                    while (notifyQueue.TryDequeue(out data))
                    {
                        ProcessNotifyBackground(data);
                    }
                }
                catch (Exception ex)
                {
                    Debug.LogError("[CMDManager] NotifyWorkerLoop error: " + ex);
                }
            }
        }

        private void ProcessNotifyBackground(byte[] bytes)
        {
            // 直接传引用，不做限频派发
            MainThreadDispatcher.Enqueue(() =>
            {
                OnCMDBLENotify?.Invoke(bytes);
            });
            // 后台处理完毕后，只做限频派发
            //DispatchToMainThreadWithThrottle(bytes);
        }

        // 将数据派发到主线程，但节流：每 dispatchIntervalMs 才发一次
        private void DispatchToMainThreadWithThrottle(byte[] processed)
        {
            long now = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
            if (now - lastDispatchTime >= dispatchIntervalMs)
            {
                lastDispatchTime = now;
                // 直接传引用，不做 Array.Copy
                MainThreadDispatcher.Enqueue(() =>
                {
                    OnCMDBLENotify?.Invoke(processed);
                });
            }
        }

    }
}