/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2025-10-20     Administrator       the first version
 * 2025-11-12     Modified            Switch to IDLE interrupt mode (no DMA, no ringbuffer)
 * 2025-11-21     Fixed               Enable RX_IDLE mode correctly for RT-Thread 5.1
 */
#include <rtthread.h>
#include <rtdevice.h>
#include <drivers/serial.h>  // ← 显式包含，确保 RT_SERIAL_EVENT_RX_IDLE 可见
#include "data_comm.h"

#define DBG_TAG "SCCM_link"
#define DBG_LVL DBG_LOG
#include <rtdbg.h>

#define SAMPLE_UART_NAME   "uart1"
#define RX_LINE_BUF_SIZE   1024

static rt_device_t serial;
static struct rt_semaphore rx_sem;

// 接收回调
static rt_err_t uart_rx_ind(rt_device_t dev, rt_size_t size)
{
    // 注意：在 RT-Thread 5.x，当使用 INT_RX 时，size 是接收到的字节数
    // 但若启用了 RX_IDLE 模式，底层驱动会在 IDLE 时回调，并传入事件
    // 安全做法：检查是否为事件（高位标志）
   // if (size & RT_SERIAL_EVENT_RX_IDLE)
    {
        LOG_D("RX IDLE event received");
        rt_sem_release(&rx_sem);
        return RT_EOK;
    }

    // 如果是普通数据（size > 0），也可处理，但本例依赖 IDLE 触发
    return RT_EOK;
}

static int read_line_from_uart(char *buf, int maxlen)
{
    char ch;
    int len = 0;

    while (len < maxlen - 1)
    {
        // 注意：在 INT_RX 模式下，rt_device_read 会从驱动内部 buffer 读取
        rt_size_t result = rt_device_read(serial, 0, &ch, 1);
        if (result <= 0)
        {
            break; // 无更多数据
        }

        buf[len++] = ch;
        if (ch == '\n')
        {
            buf[len] = '\0';
            return len;
        }
    }

    buf[len] = '\0';
    return len;
}

void uart_thread_entry(void *parameter)
{
    char input[RX_LINE_BUF_SIZE];
    int len;

    rt_sem_init(&rx_sem, "rx_sem", 0, RT_IPC_FLAG_FIFO);

    serial = rt_device_find(SAMPLE_UART_NAME);
    if (!serial)
    {
        LOG_E("Cannot find %s", SAMPLE_UART_NAME);
        return;
    }

    // Step 1: 设置串口基本参数（波特率等）
    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
    config.baud_rate = BAUD_RATE_115200; // 根据需要调整
    config.data_bits = DATA_BITS_8;
    config.stop_bits = STOP_BITS_1;
    config.parity = PARITY_NONE;
    config.bufsz = RX_LINE_BUF_SIZE; // 驱动内部接收 buffer 大小
    rt_device_control(serial, RT_DEVICE_CTRL_CONFIG, &config);

    // Step 2: 【关键】启用 RX IDLE 模式
  //  rt_device_control(serial, RT_DEVICE_CTRL_CONFIG, (void*)RT_SERIAL_RX_IDLE);

    // Step 3: 打开串口（使用中断接收）
    rt_err_t result = rt_device_open(serial, RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_INT_TX);
    if (result != RT_EOK)
    {
        LOG_E("Failed to open %s, error=%d", SAMPLE_UART_NAME, result);
        return;
    }

    // Step 4: 设置回调
    rt_device_set_rx_indicate(serial, uart_rx_ind);

    LOG_I("SCCM thread (IDLE mode) running on %s", SAMPLE_UART_NAME);

    while (1)
       {
           // 等待数据就绪
           if (rt_sem_take(&rx_sem, RT_WAITING_FOREVER) == RT_EOK)
           {
               // 处理接收到的数据（提取完整行）
               while ((len = get_line(input, sizeof(input))) > 0)
               {
                   // 动态分配请求结构体（见之前完整代码）
                   struct proc_request *req = rt_malloc(sizeof(struct proc_request));
                   if (!req) continue;

                   rt_strncpy(req->input, input, sizeof(req->input));
                   req->input_len = len;
                   //req->input[len]='\0';

                   req->sem = rt_malloc(sizeof(struct rt_semaphore));
                   if (!req->sem) {
                       rt_free(req);
                       continue;
                   }
                   rt_sem_init(req->sem, "uart_resp", 0, RT_IPC_FLAG_FIFO);

                   // 发送到处理线程
                   if (rt_mq_send(proc_mq, &req, sizeof(req)) == RT_EOK)
                   {
                       // 等待处理完成
                       if (rt_sem_take(req->sem, RT_WAITING_FOREVER) == RT_EOK)
                       {
                           rt_device_write(serial, 0, req->output, req->output_len);
                       }
                   }

                   // 清理
                   rt_sem_detach(req->sem);  // 或 rt_sem_delete
                   rt_free(req->sem);
                   rt_free(req);
               }
           }
       }
}

int start_uart_thread(void)
{
    rt_thread_t tid = rt_thread_create("data_uart",
                                       uart_thread_entry,
                                       RT_NULL,
                                       2048,
                                       25,
                                       10);
    if (tid != RT_NULL)
    {
        rt_thread_startup(tid);
        LOG_I("Create SCCM_uart thread");
        return 0;
    }
    else
    {
        LOG_E("Failed to create SCCM_uart thread!");
        return -1;
    }
}