/*
 * usart_biz.c
 *
 *  Created on: 2026-02-26
 *      Author: wangfq
 *  Updated:   2026-07-02 — 使用 loop_uart_proto 帧解析器替代 timeout heuristic
 */

#include "config.h"
#include "cmcng.h"
#include "loop_uart_proto.h"
#include <string.h>
#include "dbn_ble_srv.h"

void USART1_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
void USART2_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));


/*==================== UART2 RX DMA (2026-08-17 方案A) ====================
 * 根因: PRINT 临界区(关中断 ~7.4ms)期间 USART2 RXNE 中断被屏蔽 → 丢字节 → checksum fail
 * 方案: DMA1_Ch6 循环模式硬件收字节 (不依赖 CPU 中断), 主循环轮询消费
 *  - 512B 环形缓冲: 能装 ~7 帧 (70B), 覆盖主循环长阻塞窗口 (SPI 擦除 45ms)
 *  - 无新增中断 (关 RXNE, DMA 硬件接管) → 无优先级冲突; WCHNET 用独立 ETH DMA,
 *    BLE 栈不用 DMA1 → Ch6 独占无冲突
 *  - lup_feed_byte 状态机移入主循环 (原中断上下文) → 无中断竞争更安全
 *======================================================================*/
#define UART2_DMA_BUF_LEN   512
static uint8_t uart2_dma_buf[UART2_DMA_BUF_LEN] __attribute__((aligned(4)));
static uint16_t uart2_dma_last = 0;    /* 主循环消费位置 (DMA 写指针由硬件维护) */
static uint32_t uart2_dma_drop = 0;    /* 溢出丢弃计数 (主循环消费不及时) */

void uart2_dma_init(void)
{
    DMA_InitTypeDef DMA_InitStructure;

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    DMA_DeInit(DMA1_Channel6);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&USART2->DATAR);
    DMA_InitStructure.DMA_MemoryBaseAddr      = (uint32_t)uart2_dma_buf;
    DMA_InitStructure.DMA_DIR                 = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize          = UART2_DMA_BUF_LEN;
    DMA_InitStructure.DMA_PeripheralInc       = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc           = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize  = DMA_PeripheralDataSize_Byte;
    DMA_InitStructure.DMA_MemoryDataSize      = DMA_MemoryDataSize_Byte;
    DMA_InitStructure.DMA_Mode                = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority            = DMA_Priority_High;
    DMA_InitStructure.DMA_M2M                 = DMA_M2M_Disable;
    DMA_Init(DMA1_Channel6, &DMA_InitStructure);

    /* DMA 接管 USART2 RX: 硬件收字节, 打印关中断不丢 */
    USART_DMACmd(USART2, USART_DMAReq_Rx, ENABLE);
    DMA_Cmd(DMA1_Channel6, ENABLE);

    /* 关闭 RXNE 中断 (DMA 接管后逐字节中断不再需要) */
    USART_ITConfig(USART2, USART_IT_RXNE, DISABLE);

    uart2_dma_last = 0;
}

/* 主循环每轮调用: 消费 DMA 环形缓冲新字节 → 批量喂 lup_feed_byte 状态机 */
void uart2_dma_poll(void)
{
    uint16_t cur = (uint16_t)(UART2_DMA_BUF_LEN - DMA_GetCurrDataCounter(DMA1_Channel6));
    uint16_t n   = (uint16_t)((cur + UART2_DMA_BUF_LEN - uart2_dma_last) & (UART2_DMA_BUF_LEN - 1));

    if (n == 0) return;

    /* 溢出保护: 未消费 > 半缓冲 (256B) → 消费太慢被 DMA 覆盖, 重置解析器丢帧计数 */
    if (n > (UART2_DMA_BUF_LEN / 2)) {
        uart2_dma_drop++;
        lup_frame_reset();
        uart2_dma_last = cur;
        return;
    }

    while (n--) {
        uint8_t b = uart2_dma_buf[uart2_dma_last];
        uart2_dma_last = (uint16_t)((uart2_dma_last + 1) & (UART2_DMA_BUF_LEN - 1));

        if (lup_feed_byte(b)) {
            /* 帧接收完成 → 复制到 g_pkg_uart_2 (与中断版同逻辑, 主循环无竞争) */
            const uint8_t *frame = lup_frame_data();
            uint16_t frame_len = lup_frame_len();
            if (frame_len <= BUFF_STACK_SIZE) {
                memcpy(g_pkg_uart_2.pkg, frame, frame_len);
                g_pkg_uart_2.offset = frame_len;
                g_pkg_uart_2.flag   = 1;
                g_pkg_uart_2.tick   = 0;
            }
            lup_frame_reset();
        }
    }
}

void uart_init(void){
    GPIO_InitTypeDef  GPIO_InitStructure = {0};
    USART_InitTypeDef USART_InitStructure = {0};
    NVIC_InitTypeDef  NVIC_InitStructure  = {0};

    // usart1 : peripheral / DEBUG


    //usart2 :loop mcu
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;         // Tx
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   // Rx
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate            = 192000;  // Loop MCU 实际波特率
    USART_InitStructure.USART_WordLength          = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits            = USART_StopBits_1;
    USART_InitStructure.USART_Parity              = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode                = USART_Mode_Tx | USART_Mode_Rx;

    USART_Init(USART2, &USART_InitStructure);
    /* RXNE 中断由 uart2_dma_init 关闭 (DMA 接管, 2026-08-17) */

    NVIC_InitStructure.NVIC_IRQChannel                   = USART2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority        = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    USART_Cmd(USART2, ENABLE);

    uart2_dma_init();   /* DMA 循环接收接管 (2026-08-17) */


    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 初始化帧解析器
    lup_frame_reset();

}



/*********************************************************************
 * @fn      USART1_IRQHandler
 *
 * @brief   This function handles USART1 global interrupt request.
 *
 * @return  none
 */
void USART1_IRQHandler(void)
{

}


/*********************************************************************
 * @fn      USART2_IRQHandler
 *
 * @brief   USART2 RX — 使用 lup_feed_byte() 帧解析器
 *          当解析出完整帧时，复制到 g_pkg_uart_2.pkg 并设置 flag
 *
 * @return  none
 */
void USART2_IRQHandler(void)
{
    /* 2026-08-17: RXNE 中断已关 (DMA 接管), 本 handler 不再触发。
       保留空函数 + IDLE 中断注释: 若后续需要帧边界辅助, 在此加
       USART_IT_IDLE 处理 (读 SR + 读 DR 清标志, 置标志由主循环消费)。 */
}


void UART2_SendString(uint8_t *buf, uint16_t len)
{
    uint16_t _len = len;
    while(_len){
        while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
        USART_SendData(USART2, *buf++);
        _len--;
    }
    while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
}

void UART1_SendString(uint8_t *buf, uint16_t len)
{
    uint16_t _len = len;
    while(_len){
        while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
        USART_SendData(USART1, *buf++);
        _len--;
    }
}


/*
 * uart_srv — 主循环中调用，处理已接收完整的 UART2 帧
 *
 * 处理流程:
 *  1. 0x7F + 0xC0/0x0C → 传感器数据上报
 *     - 若无 BLE 连接 → 标记 `_report_flag`，在 TCP JSON 中处理
 *     - 若有 BLE 连接且 acs_enable → 转 0x8F 前缀发给 BLE
 *  2. 0x7F + 其他 CMD → 响应帧，交给 lup_process_frame() 匹配挂起命令
 *  3. 非 0x7F → 调试打印（可能是字符串等）
 */
void uart_srv(void)
{
    uint8_t i;
    uint8_t _report_flag = 0;

    uart2_dma_poll();   /* DMA 环形缓冲 → 帧解析 (2026-08-17) */

    // 检查命令超时
    lup_cmd_check_timeout();

    if(g_pkg_uart_2.flag){

        if(g_flag_counter_ota.flag == 0){
            if(g_pkg_uart_2.pkg[0] == 0x7F){
                uint8_t cmd = g_pkg_uart_2.pkg[3];

                // --- 所有 0x7F 帧先经过 lup_process_frame 校验 ---
                // 0xC0: 校验后通过回调直接推送 TCP JSON
                // 其他: 校验后匹配挂起命令
                lup_process_frame(g_pkg_uart_2.pkg, g_pkg_uart_2.offset);

                // --- 传感器上报 (0xC0) 分流 ---
                // 回调已处理 TCP 推送，此处仅处理 BLE 转发
                if(cmd == LUP_CMD_SENSOR_REPORT)
                {
                    if(g_dbn_ble_state_acs_enable.flag != 0){
                        // BLE ACS 已连接 → 改 Magic 为 0x8F 发给 BLE
                        g_pkg_uart_2.pkg[0] = 0x8F;
                        g_flag_notify_temp = set_response_tran_to_notify(g_pkg_uart_2.pkg, g_pkg_uart_2.offset, &g_notify_buftemp);  // 保留给 BLE
                    }
                    /* 2026-08-13 修复: 0xC0 帧消费后必须清 flag —
                       原缺失, auth 未通过时 tcp_json_push_sensor 提前 return
                       也不清 → 坏帧/正常帧反复处理 (checksum fail 刷屏) */
                    InitPkgUart(&g_pkg_uart_2);
                }
                else {
                    if(g_flag_bt_state){
                        g_flag_notify_temp = set_response_tran_to_notify(g_pkg_uart_2.pkg, g_pkg_uart_2.offset, &g_notify_buftemp);
                        InitPkgUart(&g_pkg_uart_2);
                    }
                    else {
                        /* 2026-08-13 修复: 非 0xC0 + 无 BLE 连接也清 flag (原缺失) */
                        InitPkgUart(&g_pkg_uart_2);
                    }                    
                }

                // 调试打印 (2026-08-13: LUP Rx 已在 lup_process_frame 缓冲打印,
                // 此处重复逐字节打印冗余且高频 — 暂时关闭)
#if 0
                for(i = 0; i < g_pkg_uart_2.offset; i++){
                    PRINT(" %02X", g_pkg_uart_2.pkg[i]);
                }
                PRINT("\n");
#endif

            }
            else {
                // 非 0x7F 魔法字节 — hex 打印 (原 %s 会把二进制当字符串 → 乱码)
                PRINT("Rcv_len:%d,dat:", g_pkg_uart_2.offset);
                for(i = 0; i < g_pkg_uart_2.offset; i++){
                    PRINT(" %02X", g_pkg_uart_2.pkg[i]);
                }
                PRINT("\n");
            }
        }
        else{
            // OTA 模式 — 忽略 Loop MCU 数据
        }


        if(g_flag_bt_state){

        }
        else{
            g_dbn_ble_state_acs_enable.flag = 0;
        }

    }
}