use anyhow::{Context, Result};
use rumqttc::{Client, MqttOptions, QoS};
use serde::{Serialize, Deserialize};
use serde_json;
use std::io::{self, Read};
use std::time::Duration;
use std::thread;
use serialport;
use actix_web::{web, App, HttpServer, HttpResponse};
use actix_cors::Cors;
use std::fs;

#[derive(Serialize, Deserialize)]
struct WeightData {
    weight: String,
    timestamp: u64,
}

#[derive(Serialize)]
struct MacResponse {
    mac_address: String,
}

#[derive(Serialize)]
struct ScaleTypeResponse {
    scale_type: String,
}

#[derive(Deserialize)]
struct MqttConfig {
    client_id: String,
    host: String,
    port: u16,
    username: String,
    password: String,
    keep_alive_secs: u64,
    topic_prefix: String,
}

#[derive(Deserialize)]
struct Config {
    scale_type: String,
    serial_port: String,
    baud_rate: u32,
    mqtt: MqttConfig,
}

fn read_config() -> Result<Config> {
    let config_path = "config.json";
    let content = fs::read_to_string(config_path)
        .with_context(|| format!("无法读取配置文件 {}", config_path))?;
    let config: Config = serde_json::from_str(&content)
        .with_context(|| format!("配置文件格式错误 {}", config_path))?;
    Ok(config)
}

fn get_mac_address() -> String {
    match read_config() {
        Ok(config) => config.scale_type,
        Err(_) => String::from("Unknown")
    }
}

fn get_scale_type() -> String {
    match read_config() {
        Ok(config) => config.scale_type,
        Err(_) => String::from("Unknown")
    }
}

// HTTP处理函数
async fn get_mac() -> HttpResponse {
    let mac = get_mac_address();
    println!("HTTP请求：获取MAC地址 = {}", mac);
    let response = MacResponse {
        mac_address: mac,
    };
     // 在新线程中运行MQTT和串口服务
     let mqtt_handle = tokio::spawn(async {
        if let Err(e) = run_mqtt_and_serial().await {
            eprintln!("MQTT/串口服务错误: {}", e);
        }
    });
    
    
    HttpResponse::Ok().json(response)
}

// 新增的HTTP处理函数
async fn get_scale() -> HttpResponse {
    let scale_type = get_scale_type();
    println!("HTTP请求：获取天平类型 = {}", scale_type);
    let response = ScaleTypeResponse {
        scale_type,
    };
    HttpResponse::Ok().json(response)
}

#[actix_web::main]
async fn main() -> Result<()> {
    println!("程序启动...");
    
    // 启动HTTP服务器
    println!("正在启动HTTP服务器...");
    
    // 创建HTTP服务器
    let server = HttpServer::new(|| {
        // 配置CORS
        let cors = Cors::default()
            .allow_any_origin()  // 允许所有来源
            .allow_any_method()  // 允许所有HTTP方法
            .allow_any_header()  // 允许所有请求头
            .max_age(3600);      // 设置预检请求的缓存时间（秒）
            
        App::new()
            .wrap(cors)  // 添加CORS中间件
            .route("/mac", web::get().to(get_mac))
            .route("/scale", web::get().to(get_scale))  // 新增的路由
    })
    .bind(("0.0.0.0", 8080))?
    .run();
    
    println!("HTTP服务器已启动，监听在 http://127.0.0.1:8080");
    
   
    // 等待HTTP服务器结束
    server.await?;
    
    Ok(())
}

// MQTT和串口处理函数
async fn run_mqtt_and_serial() -> Result<()> {
    // 读取配置
    let config = read_config()?;
    
    // 创建 MQTT 客户端
    let mut mqttopts = MqttOptions::new(
        &config.mqtt.client_id,
        &config.mqtt.host,
        config.mqtt.port
    );
    mqttopts.set_keep_alive(Duration::from_secs(config.mqtt.keep_alive_secs));
    mqttopts.set_credentials(&config.mqtt.username, &config.mqtt.password);
    let (mut client, mut connection) = Client::new(mqttopts, 10);

    // 在单独的线程中处理 MQTT 连接
    thread::spawn(move || {
        for notification in connection.iter() {
            match notification {
                Ok(_) => {}
                Err(e) => {
                    eprintln!("MQTT连接错误: {:?}", e);
                    break;
                }
            }
        }
    });

    // 打开配置的串口
    println!("正在尝试打开串口 {}...", config.serial_port);
    let mut port = serialport::new(&config.serial_port, config.baud_rate)
        .timeout(Duration::from_millis(1000))
        .open()
        .with_context(|| format!("无法打开串口 {}", config.serial_port))?;

    println!("成功打开串口 {}!", config.serial_port);
    println!("正在读取数据... (按 Ctrl+C 退出)");

    // 增加缓冲区大小并使用String来累积数据
    let mut serial_buf: Vec<u8> = vec![0; 1024];
    let mut accumulated_data = String::new();
    
    loop {
        match port.read(serial_buf.as_mut_slice()) {
            Ok(t) => {
                if t > 0 {
                    // 将新数据添加到累积的字符串中
                    if let Ok(data) = String::from_utf8(serial_buf[..t].to_vec()) {
                        accumulated_data.push_str(&data);
                        
                        // 检查是否有完整的数据行（以换行符或回车符结束）
                        if accumulated_data.contains('\n') || accumulated_data.contains('\r') {
                            // 处理累积的数据
                            let lines: Vec<&str> = accumulated_data
                                .split(|c| c == '\n' || c == '\r')
                                .filter(|s| !s.is_empty())
                                .collect();
                            
                            for line in lines {
                                let trimmed_data = line.trim();
                                if !trimmed_data.is_empty() {
                                    println!("收到完整数据: {}", trimmed_data);
                                    
                                    // 创建权重数据结构
                                    let weight_data = WeightData {
                                        weight: trimmed_data.to_string(),
                                        timestamp: std::time::SystemTime::now()
                                            .duration_since(std::time::UNIX_EPOCH)
                                            .unwrap()
                                            .as_secs(),
                                    };

                                    // 序列化数据
                                    let json_data = serde_json::to_string(&weight_data)?;
                                    println!("当前JSON数据: {}", json_data);
                                    
                                    // 获取MAC地址
                                    let mac_address = get_mac_address();
                                    println!("MAC地址: {}", mac_address);
                                    // 发布到 MQTT，主题中包含MAC地址
                                    let topic = format!("{}/{}", config.mqtt.topic_prefix, mac_address);
                                    if let Err(e) = client.publish(topic, QoS::AtLeastOnce, false, json_data) {
                                        eprintln!("MQTT发布错误: {:?}", e);
                                    } else {
                                        println!("成功发送数据到MQTT");
                                    }
                                }
                            }
                            
                            // 清空累积的数据
                            accumulated_data.clear();
                        }
                    }
                }
            }
            Err(ref e) if e.kind() == io::ErrorKind::TimedOut => {
                // Timeout is not an error, just continue
                continue;
            }
            Err(e) => {
                eprintln!("发生错误: {}", e);
                break;
            }
        }
    }

    Ok(())
}