package com.mes.util;

import com.mes.ui.MesClient;

import javax.bluetooth.*;
import javax.microedition.io.Connector;
import javax.microedition.io.StreamConnection;
import java.io.*;

public class BluetoothUtils {
    // 目标设备地址 二线：001135390238  k3:00113538028A  一线：001135390246
    private static final String TARGET_DEVICE_ADDRESS = "001135390238";
    // 标志位
    private static volatile boolean isRunning = true;

    // 【关键修改】将连接对象和流对象提升为静态变量，保持持久化
    private static StreamConnection connection;
    private static InputStream is;
    private static BufferedReader reader;

    public static void init() {
        try {
            LocalDevice localDevice = LocalDevice.getLocalDevice();
            System.out.println("本地蓝牙名称: " + localDevice.getFriendlyName());
            System.out.println("将尝试连接到设备地址: " + TARGET_DEVICE_ADDRESS);

            String btsppUrl = "btspp://" + TARGET_DEVICE_ADDRESS + ":1;authenticate=false;encrypt=false;master=false";

            // 在新线程中连接，避免阻塞
            new Thread(() -> {
                try {
                    // 如果已经连接，先跳过
                    if (connection != null && MesClient.com_connect_flag) {
                        return;
                    }

                    System.out.println("尝试建立蓝牙连接...");
                    // 建立连接
                    connection = (StreamConnection) Connector.open(btsppUrl);

                    // 【关键修改】连接成功后立即初始化流，并保持打开状态
                    if (connection != null) {
                        is = connection.openInputStream();
                        reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                        MesClient.com_connect_flag = true;
                        System.out.println("蓝牙连接成功，输入流已就绪");
                    }
                } catch (IOException e) {
                    System.err.println("蓝牙连接失败: " + e.getMessage());
                    closeConnection(); // 连接失败清理资源
                }
            }).start();

        } catch (BluetoothStateException e) {
            e.printStackTrace();
        }
    }

    /**
     * 接收数据并解析重量 (复用已有的连接和流)
     */
    public static String connectAndReceiveData() {
        // 1. 检查连接状态
        if (connection == null || reader == null || !MesClient.com_connect_flag) {
            System.err.println("错误: 蓝牙未连接");
            return "未连接";
        }

        try {
            long startTime = System.currentTimeMillis();
            long timeout = 2000; // 3秒超时

            // 清空缓冲区旧数据（可选，视称重仪表特性而定）
            while (reader.ready()) { reader.readLine(); }

            System.out.println("开始读取重量数据...");

            // 2. 循环读取直到超时或获取到数据
            while ((System.currentTimeMillis() - startTime < timeout)) {
                // 使用 ready() 避免 readLine() 在没有数据时无限阻塞
                if (reader.ready()) {
                    String data = reader.readLine();
                    if (data != null) {
                        System.out.println("收到数据: " + data);
                        String wet = extractWeight(data);
                        if (wet != null && !wet.equals("")) {
                            return wet;
                        }
                    }
                } else {
                    // 没有数据时短暂休眠
                    Thread.sleep(100);
                }
            }

            System.out.println("读取超时");
            return "超时";

        } catch (IOException | InterruptedException e) {
            System.err.println("读取数据异常: " + e.getMessage());
            // 【关键修改】只有在发生真实IO异常时才关闭连接，触发重连
            closeConnection();
            return "异常";
        }
        // 【关键修改】这里去掉了 finally { close() }，确保连接不被切断
    }

    /**
     * 关闭蓝牙连接并重置资源
     */
    public static void closeConnection() {
        isRunning = false;
        MesClient.com_connect_flag = false;
        try {
            if (reader != null) {
                reader.close();
                reader = null;
            }
            if (is != null) {
                is.close();
                is = null;
            }
            if (connection != null) {
                connection.close();
                connection = null;
            }
            System.out.println("蓝牙资源已释放");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 解析重量
    public static String extractWeight(String input) {
        if (input == null) return null;
        java.util.regex.Pattern pattern = java.util.regex.Pattern.compile("\\d+(?:\\.\\d+)?\\s*kg", java.util.regex.Pattern.CASE_INSENSITIVE);
        java.util.regex.Matcher matcher = pattern.matcher(input);
        if (matcher.find()) {
            return matcher.group().trim();
        }
        // 如果没有kg单位，尝试直接提取数字（视仪表格式调整）
        try {
            // 简单的数字提取备用方案
            String num = input.replaceAll("[^0-9.]", "");
            if(!num.isEmpty()) return num + "kg";
        } catch(Exception e){}

        return "";
    }

}