import 'dart:async';
import 'dart:convert';
import 'dart:io';
import 'dart:typed_data';

import 'package:easydevice/easydevice.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:http/http.dart' as http;
import 'package:vbvs_app/component/tool/TopSlideNotification.dart';
import 'package:vbvs_app/pages/mh_page/device/controller/mht_bluetooth_controller.dart';
import 'package:ef/ef.dart'; // THapp 所在的包

// 固件升级配置（区分平台）
class UpgradeConfig {
  static const int androidInitialFps = 50;
  static const int androidSubsequentFps = 150;
  static const int androidMaxFrameSize = 120;

  static const int iosInitialFps = 30;
  static const int iosSubsequentFps = 100;
  static const int iosMaxFrameSize = 100;

  static const Duration initialPhaseDuration = Duration(seconds: 15);

  static int get maxFrameSize =>
      Platform.isAndroid ? androidMaxFrameSize : iosMaxFrameSize;

  static int getFps(Duration elapsedTime) {
    if (elapsedTime <= initialPhaseDuration) {
      return Platform.isAndroid ? androidInitialFps : iosInitialFps;
    } else {
      return Platform.isAndroid ? androidSubsequentFps : iosSubsequentFps;
    }
  }

  static Duration getFrameInterval(Duration elapsedTime) {
    final fps = getFps(elapsedTime);
    return Duration(milliseconds: (1000 / fps).round());
  }
}

/// 升级任务状态
class UpgradeTask {
  final String mac;
  final THapp thapp;
  int progress;
  String status;
  Completer<void> completer;
  DateTime startTime;
  DateTime? endTime;

  UpgradeTask({
    required this.mac,
    required this.thapp,
    this.progress = 0,
    this.status = 'waiting',
    required this.completer,
    required this.startTime,
  });
}

/// 多设备蓝牙固件升级管理器
class MultiDeviceFirmwareUpdater {
  static final MultiDeviceFirmwareUpdater _instance =
      MultiDeviceFirmwareUpdater._internal();
  factory MultiDeviceFirmwareUpdater() => _instance;
  MultiDeviceFirmwareUpdater._internal();

  final MHTBlueToothController _btController = Get.find();

  final Map<String, UpgradeTask> _upgradeTasks = {};
  final Map<String, Uint8List> _firmwareDataCache = {};
  final int _maxConcurrentUpgrades = 2;
  int _currentConcurrentUpgrades = 0;

  Future<void> startUpgrade({
    required THapp thapp,
    required String mac,
    required String firmwareUrl,
  }) async {
    if (_upgradeTasks.containsKey(mac)) {
      final existingTask = _upgradeTasks[mac]!;
      if (existingTask.status == 'upgrading' ||
          existingTask.status == 'downloading') {
        throw Exception("[蓝牙指令执行日志] 设备 $mac 正在升级中".tr);
      }
    }

    final completer = Completer<void>();
    final task = UpgradeTask(
      mac: mac,
      thapp: thapp,
      completer: completer,
      startTime: DateTime.now(),
    );

    _upgradeTasks[mac] = task;
    _updateUiProgress(mac, 0, 'waiting');

    _processUpgradeQueue();

    return completer.future;
  }

  void _processUpgradeQueue() {
    final waitingTasks =
        _upgradeTasks.values.where((task) => task.status == 'waiting').toList();

    for (final task in waitingTasks) {
      if (_currentConcurrentUpgrades < _maxConcurrentUpgrades) {
        _currentConcurrentUpgrades++;
        _startSingleUpgrade(task);
      }
      //screen shots      
    }
  }

  Future<void> _startSingleUpgrade(UpgradeTask task) async {
    try {
      task.status = 'downloading';

      if (!task.thapp.isConnected) {
        throw Exception("[蓝牙指令执行日志] 设备未连接".tr);
      }

      if (!_firmwareDataCache.containsKey(task.mac)) {
        await _downloadFirmware(task);
      }

      // await _sendCommand(task.thapp, "blog disable");
      _sendCommand(task.thapp, "blog disable");
      await Future.delayed(Duration(milliseconds: 200));

      task.status = 'upgrading';
      _updateUiProgress(task.mac, 0, 'upgrading');

      await _sendFirmwareFrames(task);

      await _sendCommand(task.thapp, "blog enable");
      await _verifyFirmware(task);

      task.status = 'completed';
      task.endTime = DateTime.now();
      _updateUiProgress(task.mac, 100, 'completed');

      TopSlideNotification.show(Get.context!,
          text: "设备 ${task.mac} 固件升级成功".tr, textColor: Colors.green);

      task.completer.complete();
    } catch (e, stack) {
      ef.log("[蓝牙指令执行日志] 设备 ${task.mac} 升级失败: $e\n$stack");

      task.status = 'failed';
      task.endTime = DateTime.now();
      _updateUiProgress(task.mac, -1, 'failed');

      // TopSlideNotification.show(Get.context!,
      //     text: "设备 ${task.mac} 升级失败".tr, textColor: Colors.red);

      task.completer.completeError(e);
    } finally {
      _currentConcurrentUpgrades--;
      _cleanupTask(task.mac);
      _processUpgradeQueue();

      try {
        await _sendCommand(task.thapp, "blog enable");
      } catch (e, stack) {
        ef.log("[蓝牙指令执行日志] 重新开启日志失败: $e\n$stack");
      }
    }
  }

  Future<void> _downloadFirmware(UpgradeTask task) async {
    try {
      final firmwareUrl = _btController.currentUpgradeUrl;
      if (firmwareUrl == null) {
        throw Exception("[蓝牙指令执行日志] 固件URL为空".tr);
      }

      final response = await http.get(Uri.parse(firmwareUrl));

      if (response.statusCode != 200) {
        throw Exception("[蓝牙指令执行日志] 固件下载失败，状态码：${response.statusCode}".tr);
      }

      _firmwareDataCache[task.mac] = response.bodyBytes;
    } catch (e, stack) {
      ef.log("[蓝牙指令执行日志] 下载固件失败: $e\n$stack");
      throw Exception("[蓝牙指令执行日志] 固件下载失败".tr);
    }
  }

  Future<void> _sendFirmwareFrames(UpgradeTask task) async {
    final firmwareData = _firmwareDataCache[task.mac];
    if (firmwareData == null) {
      throw Exception("[蓝牙指令执行日志] 固件数据为空".tr);
    }

    final totalFrames =
        (firmwareData.length / UpgradeConfig.maxFrameSize).ceil();
    final stopwatch = Stopwatch()..start();
    DateTime lastFrameTime = DateTime.now();

    for (int sentFrames = 0; sentFrames < totalFrames; sentFrames++) {
      if (task.status == 'cancelled') {
        throw Exception("[蓝牙指令执行日志] 升级已取消".tr);
      }

      final elapsed = stopwatch.elapsed;
      final frameInterval = UpgradeConfig.getFrameInterval(elapsed);
      final now = DateTime.now();

      if (now.difference(lastFrameTime) < frameInterval) {
        await Future.delayed(Duration(milliseconds: 10));
        continue;
      }

      final offset = sentFrames * UpgradeConfig.maxFrameSize;
      final end = offset + UpgradeConfig.maxFrameSize;
      final frameData = firmwareData.sublist(
        offset,
        end > firmwareData.length ? firmwareData.length : end,
      );

      final base64Data = base64Encode(frameData);
      final mmxCommand =
          '''mmx path="/root/mtd/update" write base64 len=${frameData.length} offset=$offset data="$base64Data"''';

      try {
        await _sendCommand(task.thapp, mmxCommand);
      } catch (e, stack) {
        ef.log("[蓝牙指令执行日志] 发送固件帧失败: $e\n$stack");
        rethrow;
      }

      final waitTime = frameInterval - now.difference(lastFrameTime);
      if (waitTime > Duration.zero) await Future.delayed(waitTime);

      final progress = ((sentFrames + 1) / totalFrames * 100).round();
      _updateUiProgress(task.mac, progress, 'upgrading');

      lastFrameTime = now;
    }

    stopwatch.stop();
  }

  Future<void> _verifyFirmware(UpgradeTask task) async {
  try {
    final success = await _sendVotaCommand(task.thapp);
    
    if (!success) {
      throw Exception("[蓝牙指令执行日志] 固件验证失败".tr);
    }

    await Future.delayed(Duration(seconds: 10));

    bool deviceRestarted = false;
    for (int i = 0; i < 10; i++) {
      if (!task.thapp.isConnected) {
        deviceRestarted = true;
        break;
      }
      await Future.delayed(Duration(seconds: 1));
    }

    if (!deviceRestarted) {
      throw Exception("[蓝牙指令执行日志] 设备未重启，可能升级失败".tr);
    }
  } catch (e, stack) {
    ef.log("[蓝牙指令执行日志] 固件校验失败: $e\n$stack");
    throw Exception("[蓝牙指令执行日志] 固件校验失败".tr);
  }
}

  Future<dynamic> _sendCommand(THapp thapp, String command,
      {bool needResponse = false}) async {
    try {
      if (needResponse) {
        // 需要响应的命令（如 vota 命令）
        return await thapp.send(command, true, // withResponse = true
            (log) {
          ef.log("[蓝牙指令执行日志] ${log.log},指令为：$command");

          // 这里根据具体命令判断是否成功完成
          if (log.log.contains("SUCCESS") ||
              log.log.contains("OK") ||
              log.log.contains("COMPLETE") ||
              log.log.contains("successful")) {
            log.result = true; // 设置成功结果
            return true; // 停止监听
          }

          // 如果包含错误信息，也返回完成
          if (log.log.contains("ERROR") ||
              log.log.contains("FAIL") ||
              log.log.contains("failed")) {
            log.result = false; // 设置失败结果
            return true; // 停止监听
          }

          return false; // 继续监听
        },
            0, // retry = 0
            15000 // timeoutms = 15000（15秒超时）
            );
      } else {
        // 不需要响应的命令（如 mmx write、blog disable/enable）
        final success = await thapp.send(
            command,
            false, // withResponse = false
            null, // 不需要回调
            0, // retry = 0
            5000 // timeoutms = 5000（5秒超时）
            );

        if (!success) {
          ef.log("[蓝牙指令执行日志] 命令发送可能失败: $command");
        }
        return success;
      }
    } catch (e, stack) {
      ef.log("[蓝牙指令执行日志] 发送命令失败: $e\n$stack");
      throw Exception("[蓝牙指令执行日志] 发送命令失败".tr);
    }
  }

  void _updateUiProgress(String mac, int progress, String status) {
    if (Get.isRegistered<MHTBlueToothController>()) {
      final controller = Get.find<MHTBlueToothController>();
      if (controller.localUpgradeMac.containsKey(mac)) {
        controller.localUpgradeMac[mac] = {
          ...controller.localUpgradeMac[mac]!,
          "progress": progress,
          "status": status,
          "updateTime": DateTime.now().millisecondsSinceEpoch,
        };
        controller.update();
      }
    }
  }

  void _cleanupTask(String mac) {
    _firmwareDataCache.remove(mac);
  }

  void cancelUpgrade(String mac) {
    final task = _upgradeTasks[mac];
    if (task != null) {
      task.status = 'cancelled';
      _updateUiProgress(mac, -1, 'cancelled');
      task.completer.completeError(Exception("[蓝牙指令执行日志] 升级已取消".tr));

      TopSlideNotification.show(Get.context!, text: "设备 $mac 升级已取消".tr);
    }
  }

  void cancelAllUpgrades() {
    for (final mac in _upgradeTasks.keys) {
      cancelUpgrade(mac);
    }
  }

  Map<String, dynamic>? getUpgradeStatus(String mac) {
    final task = _upgradeTasks[mac];
    if (task == null) return null;

    return {
      'mac': task.mac,
      'progress': task.progress,
      'status': task.status,
      'startTime': task.startTime,
      'endTime': task.endTime,
    };
  }

  Map<String, Map<String, dynamic>> getAllUpgradeStatus() {
    final Map<String, Map<String, dynamic>> status = {};
    for (final task in _upgradeTasks.values) {
      status[task.mac] = {
        'progress': task.progress,
        'status': task.status,
        'startTime': task.startTime,
        'endTime': task.endTime,
      };
    }
    return status;
  }

  bool isDeviceUpgrading(String mac) {
    final task = _upgradeTasks[mac];
    return task != null &&
        (task.status == 'downloading' || task.status == 'upgrading');
  }

  void cleanupCompletedTasks() {
    final completedMacs = _upgradeTasks.entries
        .where((entry) =>
            ['completed', 'failed', 'cancelled'].contains(entry.value.status))
        .map((entry) => entry.key)
        .toList();

    for (final mac in completedMacs) {
      _upgradeTasks.remove(mac);
    }
  }

  Future<bool> _sendVotaCommand(THapp thapp) async {
    try {
      final result =
          await thapp.send('vota path="/root/mtd/update"', true, (log) {
        ef.log("[vota命令响应] ${log.log}");

        // vota 命令特定的成功判断
        if (log.log.contains("verification complete") ||
            log.log.contains("update successful") ||
            log.log.contains("rebooting")) {
          log.result = true;
          return true;
        }

        // vota 命令特定的失败判断
        if (log.log.contains("verification failed") ||
            log.log.contains("update error")) {
          log.result = false;
          return true;
        }

        return false;
      }, 0, 20000 // vota 命令可能需要更长时间
              );

      return result == true;
    } catch (e, stack) {
      ef.log("[vota命令异常] $e\n$stack");
      return false;
    }
  }
}