/*
底盘模组
*/


#include "cmsis_os2.h"
#include <stdlib.h>
#include "bsp/mm.h"
#include "bsp/can.h"
#include "component/ahrs.h"
#include "device/motor_rm.h"
#include "device/motor.h"
#include "module/chassis.h"

/**
 * @brief 底盘小陀螺模式相关参数
 */
#define CHASSIS_ROTOR_WZ_MIN 0.6f       //小陀螺最小速度
#define CHASSIS_ROTOR_WZ_MAX 0.8f				//小陀螺最大速度
#define M_7OVER72PI (M_2PI * 7.0f / 72.0f)   //角度偏移量（用在跟随云台35°）
#define CHASSIS_ROTOR_OMEGA 0.001f        //角速度变化频率



/**
 * @brief 设置底盘模式
 * @param c 底盘结构体指针
 * @param mode 目标控制模式
 * @param now 当前时间戳(ms)
 * @return CHASSIS_OK:成功   CHASSIS_ERR_NULL:空
 */
static int8_t Chassis_SetMode(Chassis_t *c, Chassis_Mode_t mode, uint32_t now) {
    if (!c) 
			return CHASSIS_ERR_NULL;
    if (mode == c->mode)
			return CHASSIS_OK;
//随机种子，小陀螺模式随机设置旋转方向
    if (mode == CHASSIS_MODE_ROTOR && c->mode != CHASSIS_MODE_ROTOR) {
        srand(now);
        c->wz_multi = (rand() % 2) ? -1 : 1;
    }
//重置PID和滤波
    for (uint8_t i = 0; i < c->num_wheel; i++) {
        PID_Reset(&c->pid.motor[i]);
        LowPassFilter2p_Reset(&c->filter.in[i], 0.0f);
        LowPassFilter2p_Reset(&c->filter.out[i], 0.0f);
    }

    c->mode = mode;
    return CHASSIS_OK;
}

/**
 * @brief 小陀螺模式动态角速度
 * @param min 最小速度
 * @param max 最大速度
 * @param now 当前时间戳(ms)
 * @return 角速度值
 */
static float Chassis_CalcWz(const float min, const float max, uint32_t now) {
    float wz_vary = fabsf(0.2f * sinf(CHASSIS_ROTOR_OMEGA * (float)now)) + min;
    return (wz_vary > max) ? max : wz_vary;
}

/**
 * @brief 底盘模式初始化
 * @param c 底盘结构体指针
 * @param param  底盘参数结构体指针
 * @param mech_zero 机械零点欧拉角
 * @param target_freq 控制频率(Hz)
 * @return CHASSIS_OK:成功 CHASSIS_ERR_NULL:空 CHASSIS_ERR_TYPE:不支持的模式
 */
int8_t Chassis_Init(Chassis_t *c, const Chassis_Params_t *param,
                    float target_freq) {
    if (!c) return CHASSIS_ERR_NULL;
											
		//初始化CAN通信									
		BSP_CAN_Init();
    c->param = param;
    c->mode = CHASSIS_MODE_RELAX;
		c->param->feedforward.coefficient = 0.1f;				//前馈系数				
//根据底盘不同设置模式轮子与混合器
    Mixer_Mode_t mixer_mode;
    switch (param->type) {
        case CHASSIS_TYPE_MECANUM://麦轮
					c->num_wheel = 4; 
				mixer_mode = MIXER_MECANUM;
				break;
        case CHASSIS_TYPE_PARLFIX4:
					c->num_wheel = 4; 
				mixer_mode = MIXER_PARLFIX4;
				break;
        case CHASSIS_TYPE_PARLFIX2:
					c->num_wheel = 2; 
				mixer_mode = MIXER_PARLFIX2; 
				break;
        case CHASSIS_TYPE_OMNI_CROSS:
					c->num_wheel = 4;
				mixer_mode = MIXER_OMNICROSS;
				break;
        case CHASSIS_TYPE_OMNI_PLUS: //全向轮（老步兵类型）
					c->num_wheel = 4;
				mixer_mode = MIXER_OMNIPLUS;
				break;
        case CHASSIS_TYPE_SINGLE:
					c->num_wheel = 1; 
				mixer_mode = MIXER_SINGLE;
				break;
        default: 
					return CHASSIS_ERR_TYPE;
    }
		//初始化时间戳
				c->last_wakeup = 0;
				c->dt = 0.0f;
		//初始化PID和滤波
    for (uint8_t i = 0; i < c->num_wheel; i++) {
        PID_Init(&c->pid.motor[i], KPID_MODE_NO_D, target_freq, &param->pid.motor_pid_param);
        LowPassFilter2p_Init(&c->filter.in[i], target_freq, param->low_pass_cutoff_freq.in);
        LowPassFilter2p_Init(&c->filter.out[i], target_freq, param->low_pass_cutoff_freq.out);
			//清零电机反馈
				c->feedback.motor[i].rotor_speed = 0;
        c->feedback.motor[i].torque_current = 0;
        c->feedback.motor[i].rotor_abs_angle = 0;
        c->feedback.motor[i].temp = 0;
    }
     //初始化PID和混合器
    PID_Init(&c->pid.follow, KPID_MODE_NO_D, target_freq, &param->pid.follow_pid_param);
    Mixer_Init(&c->mixer, mixer_mode);
     //清零运动向量和输出
    c->move_vec.vx = c->move_vec.vy = c->move_vec.wz = 0.0f;
		for (uint8_t i = 0; i < c->num_wheel; i++) { 
				c->out.motor[i] = 0.0f;
		}
		//注册大疆电机
		for (int i = 0; i < c->num_wheel; i++) {
			MOTOR_RM_Register(&(c->param->motor_param[i]));
			 
		}
    return CHASSIS_OK;
}

/**
 * @brief 更新电机反馈(IMU+电机状态)
 * @param c 底盘结构体指针
 * @param feedback 底盘反馈指针结构体
 * @return CHASSIS_OK:成功 CHASSIS_ERR_NULL:空
 */
int8_t Chassis_UpdateFeedback(Chassis_t *c) {

		//更新所有电机反馈
    for (uint8_t i = 0; i < c->num_wheel; i++) {
			MOTOR_RM_Update(&(c->param->motor_param[i])); 
			MOTOR_RM_t *rm_motor = MOTOR_RM_GetMotor(&(c->param->motor_param[i]));
			c->motors[i] = rm_motor;
			MOTOR_RM_t *rm = c->motors[i];
         if (rm_motor != NULL) {
            c->feedback.motor[i] = rm_motor->feedback;
             }else 
					{ 
					return CHASSIS_ERR_NULL; 
					} 
		}
    return CHASSIS_OK;
}


/**
 * @brief 底盘电机控制
 * @param c 底盘结构体指针
 * @param c_cmd 控制命令
 * @param now 当前时间戳(ms)
 * @return CHASSIS_OK:成功 CHASSIS_ERR_NULL:空
 */
int8_t Chassis_Control(Chassis_t *c, const Chassis_CMD_t *c_cmd, uint32_t now) {
    if (!c || !c_cmd) return CHASSIS_ERR_NULL;
		//计算控制周期
    c->dt = (float)(now - c->last_wakeup) / 1000.0f; 
    c->last_wakeup = now;
		if (!isfinite(c->dt) || c->dt <= 0.0f) {
				c->dt = 0.001f;            
		}
		if (c->dt < 0.0005f) c->dt = 0.0005f;   
		if (c->dt > 0.050f)  c->dt = 0.050f;    
    //设置模式
    Chassis_SetMode(c, c_cmd->mode, now);
    //不同模式下对应解算（运动向量）
    switch (c->mode) {
        case CHASSIS_MODE_BREAK:
            c->move_vec.vx = c->move_vec.vy = 0.0f;
            break;
        case CHASSIS_MODE_INDEPENDENT:
            c->move_vec.vx = c_cmd->ctrl_vec.vx ;
            c->move_vec.vy = c_cmd->ctrl_vec.vy ;
            break;
        default: {      //遥控器坐标->机体坐标系
            float beta = c->feedback.encoder_gimbalYawMotor - c->mech_zero;
            float cosb = cosf(beta);
            float sinb = sinf(beta);
            c->move_vec.vx = cosb * c_cmd->ctrl_vec.vx - sinb * c_cmd->ctrl_vec.vy ;
            c->move_vec.vy = sinb * c_cmd->ctrl_vec.vx + cosb * c_cmd->ctrl_vec.vy ;
            break;
        }
    }
		//根据模式计算底盘角速度
    switch (c->mode) {
        case CHASSIS_MODE_RELAX:
        case CHASSIS_MODE_BREAK:
        case CHASSIS_MODE_INDEPENDENT:
            c->move_vec.wz = 0.0f;
            break;
        case CHASSIS_MODE_OPEN:
						c->move_vec.wz = c_cmd->ctrl_vec.wz ;
						break;
				//云台跟随
        case CHASSIS_MODE_FOLLOW_GIMBAL:
            c->move_vec.wz = PID_Calc(&c->pid.follow, c->mech_zero, c->feedback.encoder_gimbalYawMotor, 0.0f, c->dt) ;
            break;
				//云台跟随（偏移）
        case CHASSIS_MODE_FOLLOW_GIMBAL_35:
            c->move_vec.wz = PID_Calc(&c->pid.follow,c->mech_zero +M_7OVER72PI, c->feedback.encoder_gimbalYawMotor, 0.0f, c->dt) ;
            break;
				//小陀螺
        case CHASSIS_MODE_ROTOR:
            c->move_vec.wz = c->wz_multi * Chassis_CalcWz(CHASSIS_ROTOR_WZ_MIN,CHASSIS_ROTOR_WZ_MAX, now) ;
            break;
    }
        //运动学逆解算，运动向量分解为电机转速
    Mixer_Apply(&c->mixer, &c->move_vec, c->setpoint.motor_rpm, c->num_wheel, 500.0f);


    for (uint8_t i = 0; i < c->num_wheel; i++) {
				float rf = c->setpoint.motor_rpm[i];///目标转速
        float fb = LowPassFilter2p_Apply(&c->filter.in[i], (float)c->feedback.motor[i].rotor_speed);
				float out_current;
        switch (c->mode) {
            case CHASSIS_MODE_BREAK:
            case CHASSIS_MODE_FOLLOW_GIMBAL:
            case CHASSIS_MODE_FOLLOW_GIMBAL_35:
            case CHASSIS_MODE_ROTOR:
            case CHASSIS_MODE_INDEPENDENT:
                out_current = PID_Calc(&c->pid.motor[i], c->setpoint.motor_rpm[i], fb, 0.0f, c->dt);
								const float K_FF = c->param->feedforward.coefficient; //前馈系数，具体值在初始化部分，使用时可以自己修改。
                float feedforward_current = K_FF * c->setpoint.motor_rpm[i];
                out_current += feedforward_current; //总电流 = 前馈电流 + 反馈电流
                break;
            case CHASSIS_MODE_OPEN:
                out_current = c->setpoint.motor_rpm[i] / 7000.0f ;
                break;
            case CHASSIS_MODE_RELAX:
                out_current = 0.0f ;
                break;
        }

       //低通滤波和限幅
         c->out.motor[i] = LowPassFilter2p_Apply(&c->filter.out[i], out_current);
				 Clip(&c->out.motor[i], -c->param->limit.max_current, c->param->limit.max_current);
    }

			
    return CHASSIS_OK;
}

/**
 * @brief 电机输出
 * @param c 底盘结构体指针
 */
void Chassis_Output(Chassis_t *c) {
    if (!c) 
			return;

    //每个电机目标输出
    for (uint8_t i = 0; i < c->num_wheel; i++) {
        MOTOR_RM_t *rm = c->motors[i];
        if (!rm) continue;
        MOTOR_RM_SetOutput(&rm->param, c->out.motor[i]);
    }

    //调用ctrl
    for (uint8_t i = 0; i < c->num_wheel; i++) {
        MOTOR_RM_t *rm = c->motors[i];
        if (rm) {
            MOTOR_RM_Ctrl(&rm->param);
        }
    }
}

/**
 * @brief 重置底盘输出
 * @param c  底盘结构体指针
 */
void Chassis_ResetOutput(Chassis_t *c) {
    if (!c) return;
    for (uint8_t i = 0; i < c->num_wheel; i++) {
        MOTOR_RM_t *m = c->motors[i];
        if (m) {
            MOTOR_RM_Relax(&(m->param));
        }
    }
}