#include "remote_control.h"
#include "string.h"
#include "bsp_usart.h"

#define RC_CHANNAL_ERROR_VALUE 700
#define REMOTE_CONTROL_FRAME_SIZE 18u
#define RC_abs(x) (x)>0?(x):(-x)
#define RC_USART_SERVICE_ID 1

//remote control data 
static RC_ctrl_t rc_ctrl;
static usart_instance rc_usart_instance;

/**
  * @brief          remote control protocol resolution
  * @param[in]      sbus_buf: raw data point
  * @param[out]     rc_ctrl: remote control data struct point
  * @retval         none
  */
static void sbus_to_rc(volatile const uint8_t *sbus_buf, RC_ctrl_t *rc_ctrl);

/**
 * @brief protocol resolve callback
 *        this func would be called when usart3 idle interrupt happens
 * 
 */
static void ReceiveCallback()
{
    sbus_to_rc(rc_usart_instance.recv_buff,&rc_ctrl);
}

void RC_init(UART_HandleTypeDef* rc_usart_handle)
{
    rc_usart_instance.module_callback=ReceiveCallback;
    rc_usart_instance.usart_handle=rc_usart_handle;
    rc_usart_instance.recv_buff_size=REMOTE_CONTROL_FRAME_SIZE;
    USARTRegister(&rc_usart_instance);
}

const RC_ctrl_t *get_remote_control_point(void)
{
    return &rc_ctrl;
}

uint8_t RC_data_is_error(void)
{
    if (RC_abs(rc_ctrl.rc.ch[0]) > RC_CHANNAL_ERROR_VALUE)
    {
        goto error;
    }
    if (RC_abs(rc_ctrl.rc.ch[1]) > RC_CHANNAL_ERROR_VALUE)
    {
        goto error;
    }
    if (RC_abs(rc_ctrl.rc.ch[2]) > RC_CHANNAL_ERROR_VALUE)
    {
        goto error;
    }
    if (RC_abs(rc_ctrl.rc.ch[3]) > RC_CHANNAL_ERROR_VALUE)
    {
        goto error;
    }
    if (rc_ctrl.rc.s[0] == 0)
    {
        goto error;
    }
    if (rc_ctrl.rc.s[1] == 0)
    {
        goto error;
    }
    return 0;
error:
    rc_ctrl.rc.ch[0] = 0;
    rc_ctrl.rc.ch[1] = 0;
    rc_ctrl.rc.ch[2] = 0;
    rc_ctrl.rc.ch[3] = 0;
    rc_ctrl.rc.ch[4] = 0;
    rc_ctrl.rc.s[0] = RC_SW_DOWN;
    rc_ctrl.rc.s[1] = RC_SW_DOWN;
    rc_ctrl.mouse.x = 0;
    rc_ctrl.mouse.y = 0;
    rc_ctrl.mouse.z = 0;
    rc_ctrl.mouse.press_l = 0;
    rc_ctrl.mouse.press_r = 0;
    rc_ctrl.key.v = 0;
    return 1;
}

static void sbus_to_rc(volatile const uint8_t *sbus_buf, RC_ctrl_t *rc_ctrl)
{
    if (sbus_buf == NULL || rc_ctrl == NULL)
    {
        return;
    }
    rc_ctrl->rc.ch[0] = (sbus_buf[0] | (sbus_buf[1] << 8)) & 0x07ff;        //!< Channel 0
    rc_ctrl->rc.ch[1] = ((sbus_buf[1] >> 3) | (sbus_buf[2] << 5)) & 0x07ff; //!< Channel 1
    rc_ctrl->rc.ch[2] = ((sbus_buf[2] >> 6) | (sbus_buf[3] << 2) |          //!< Channel 2
                         (sbus_buf[4] << 10)) &0x07ff;
    rc_ctrl->rc.ch[3] = ((sbus_buf[4] >> 1) | (sbus_buf[5] << 7)) & 0x07ff; //!< Channel 3
    rc_ctrl->rc.s[0] = ((sbus_buf[5] >> 4) & 0x0003);                  //!< Switch left
    rc_ctrl->rc.s[1] = ((sbus_buf[5] >> 4) & 0x000C) >> 2;                       //!< Switch right
    rc_ctrl->mouse.x = sbus_buf[6] | (sbus_buf[7] << 8);                    //!< Mouse X axis
    rc_ctrl->mouse.y = sbus_buf[8] | (sbus_buf[9] << 8);                    //!< Mouse Y axis
    rc_ctrl->mouse.z = sbus_buf[10] | (sbus_buf[11] << 8);                  //!< Mouse Z axis
    rc_ctrl->mouse.press_l = sbus_buf[12];                                  //!< Mouse Left Is Press ?
    rc_ctrl->mouse.press_r = sbus_buf[13];                                  //!< Mouse Right Is Press ?
    rc_ctrl->key.v = sbus_buf[14] | (sbus_buf[15] << 8);                    //!< KeyBoard value
    rc_ctrl->rc.ch[4] = sbus_buf[16] | (sbus_buf[17] << 8);                 //NULL

    rc_ctrl->rc.ch[0] -= RC_CH_VALUE_OFFSET;
    rc_ctrl->rc.ch[1] -= RC_CH_VALUE_OFFSET;
    rc_ctrl->rc.ch[2] -= RC_CH_VALUE_OFFSET;
    rc_ctrl->rc.ch[3] -= RC_CH_VALUE_OFFSET;
    rc_ctrl->rc.ch[4] -= RC_CH_VALUE_OFFSET;
}