/*
 $License:
    Copyright (C) 2011-2012 InvenSense Corporation, All Rights Reserved.
    See included License.txt for License information.
 $
 */
/**
 *   @defgroup  Results_Holder results_holder
 *   @brief     Motion Library - Results Holder
 *              Holds the data for MPL
 *
 *   @{
 *       @file results_holder.c
 *       @brief Results Holder for HAL.
 */
#include "results_holder.h"
#include "log.h"
#include "ml_math_func.h"
#include "mlmath.h"
#include "start_manager.h"
#include "data_builder.h"
#include "message_layer.h"

// These 2 status bits are used to control when the 9 axis quaternion is updated
#define INV_COMPASS_CORRECTION_SET 1
#define INV_6_AXIS_QUAT_SET 2

struct results_t {
    long nav_quat[4];
    long gam_quat[4];
    inv_time_t nav_timestamp;
    inv_time_t gam_timestamp;
    long local_field[3]; /**< local earth's magnetic field */
    long mag_scale[3]; /**< scale factor to apply to magnetic field reading */
    long compass_correction[4]; /**< quaternion going from gyro,accel quaternion to 9 axis */
    int acc_state; /**< Describes accel state */
    long compass_bias_error[3]; /**< Error Squared */
    unsigned char motion_state;
    unsigned int motion_state_counter; /**< Incremented for each no motion event in a row */
    long compass_count; /**< compass state internal counter */
    int got_compass_bias; /**< Flag describing if compass bias is known */
    int large_mag_field; /**< Flag describing if there is a large magnetic field */
    int compass_state; /**< Internal compass state */
    long status;
    struct inv_sensor_cal_t *sensor;
    float quat_confidence_interval;
};
static struct results_t rh;

/** @internal
* Store a quaternion more suitable for gaming. This quaternion is often determined
* using only gyro and accel.
* @param[in] quat Length 4, Quaternion scaled by 2^30
*/
void inv_store_gaming_quaternion(const long *quat, inv_time_t timestamp)
{
    rh.status |= INV_6_AXIS_QUAT_SET;
    memcpy(&rh.gam_quat, quat, sizeof(rh.gam_quat));
    rh.gam_timestamp = timestamp;
}

/** @internal
* Sets the quaternion adjustment from 6 axis (accel, gyro) to 9 axis quaternion.
* @param[in] data Quaternion Adjustment
* @param[in] timestamp Timestamp of when this is valid
*/
void inv_set_compass_correction(const long *data, inv_time_t timestamp)
{
    rh.status |= INV_COMPASS_CORRECTION_SET;
    memcpy(rh.compass_correction, data, sizeof(rh.compass_correction));
    rh.nav_timestamp = timestamp;
}

/** @internal
* Gets the quaternion adjustment from 6 axis (accel, gyro) to 9 axis quaternion.
* @param[out] data Quaternion Adjustment
* @param[out] timestamp Timestamp of when this is valid
*/
void inv_get_compass_correction(long *data, inv_time_t *timestamp)
{
    memcpy(data, rh.compass_correction, sizeof(rh.compass_correction));
    *timestamp = rh.nav_timestamp;
}

/** Returns non-zero if there is a large magnetic field. See inv_set_large_mag_field() for setting this variable.
 * @return Returns non-zero if there is a large magnetic field.
 */
int inv_get_large_mag_field()
{
    return rh.large_mag_field;
}

/** Set to non-zero if there as a large magnetic field. See inv_get_large_mag_field() for getting this variable.
 * @param[in] state value to set for magnetic field strength. Should be non-zero if it is large.
 */
void inv_set_large_mag_field(int state)
{
    rh.large_mag_field = state;
}

/** Gets the accel state set by inv_set_acc_state()
 * @return accel state.
 */
int inv_get_acc_state()
{
    return rh.acc_state;
}

/** Sets the accel state. See inv_get_acc_state() to get the value.
 * @param[in] state value to set accel state to.
 */
void inv_set_acc_state(int state)
{
    rh.acc_state = state;
    return;
}

/** Returns the motion state
* @param[out] cntr Number of previous times a no motion event has occured in a row.
* @return Returns INV_SUCCESS if successful or an error code if not.
*/
int inv_get_motion_state(unsigned int *cntr)
{
    *cntr = rh.motion_state_counter;
    return rh.motion_state;
}

/** Sets the motion state
 * @param[in] state motion state where INV_NO_MOTION is not moving
 *            and INV_MOTION is moving.
 */
void inv_set_motion_state(unsigned char state)
{
    long set;
    if (state == rh.motion_state) {
        if (state == INV_NO_MOTION) {
            rh.motion_state_counter++;
        } else {
            rh.motion_state_counter = 0;
        }
        return;
    }
    rh.motion_state_counter = 0;
    rh.motion_state = state;
    /* Equivalent to set = state, but #define's may change. */
    if (state == INV_MOTION)
        set = INV_MSG_MOTION_EVENT;
    else
        set = INV_MSG_NO_MOTION_EVENT;
    inv_set_message(set, (INV_MSG_MOTION_EVENT | INV_MSG_NO_MOTION_EVENT), 0);
}

/** Sets the local earth's magnetic field
* @param[in] data Local earth's magnetic field in uT scaled by 2^16.
*            Length = 3. Y typically points north, Z typically points down in
*                        northern hemisphere and up in southern hemisphere.
*/
void inv_set_local_field(const long *data)
{
    memcpy(rh.local_field, data, sizeof(rh.local_field));
}

/** Gets the local earth's magnetic field
* @param[out] data Local earth's magnetic field in uT scaled by 2^16.
*            Length = 3. Y typically points north, Z typically points down in
*                        northern hemisphere and up in southern hemisphere.
*/
void inv_get_local_field(long *data)
{
    memcpy(data, rh.local_field, sizeof(rh.local_field));
}

/** Sets the compass sensitivity
 * @param[in] data Length 3, sensitivity for each compass axis
 *  scaled such that 1.0 = 2^30.
 */
void inv_set_mag_scale(const long *data)
{
    memcpy(rh.mag_scale, data, sizeof(rh.mag_scale));
}

/** Gets the compass sensitivity
 * @param[out] data Length 3, sensitivity for each compass axis
 *  scaled such that 1.0 = 2^30.
 */
void inv_get_mag_scale(long *data)
{
    memcpy(data, rh.mag_scale, sizeof(rh.mag_scale));
}

/** Gets gravity vector
 * @param[out] data gravity vector in body frame scaled such that 1.0 = 2^30.
 * @return Returns INV_SUCCESS if successful or an error code if not.
 */
inv_error_t inv_get_gravity(long *data)
{
    data[0] =
        inv_q29_mult(rh.nav_quat[1], rh.nav_quat[3]) - inv_q29_mult(rh.nav_quat[2], rh.nav_quat[0]);
    data[1] =
        inv_q29_mult(rh.nav_quat[2], rh.nav_quat[3]) + inv_q29_mult(rh.nav_quat[1], rh.nav_quat[0]);
    data[2] =
        (inv_q29_mult(rh.nav_quat[3], rh.nav_quat[3]) + inv_q29_mult(rh.nav_quat[0], rh.nav_quat[0])) -
        1073741824L;

    return INV_SUCCESS;
}

/** Returns a quaternion based only on gyro and accel.
 * @param[out] data 6-axis  gyro and accel quaternion scaled such that 1.0 = 2^30.
 * @return Returns INV_SUCCESS if successful or an error code if not.
 */
inv_error_t inv_get_6axis_quaternion(long *data)
{
    memcpy(data, rh.gam_quat, sizeof(rh.gam_quat));
    return INV_SUCCESS;
}

/** Returns a quaternion.
 * @param[out] data 9-axis quaternion scaled such that 1.0 = 2^30.
 * @return Returns INV_SUCCESS if successful or an error code if not.
 */
inv_error_t inv_get_quaternion(long *data)
{
    if (rh.status & (INV_COMPASS_CORRECTION_SET | INV_6_AXIS_QUAT_SET)) {
        inv_q_mult(rh.compass_correction, rh.gam_quat, rh.nav_quat);
        rh.status &= ~(INV_COMPASS_CORRECTION_SET | INV_6_AXIS_QUAT_SET);
    }
    memcpy(data, rh.nav_quat, sizeof(rh.nav_quat));
    return INV_SUCCESS;
}

/** Returns a quaternion.
 * @param[out] data 9-axis quaternion.
 * @return Returns INV_SUCCESS if successful or an error code if not.
 */
inv_error_t inv_get_quaternion_float(float *data)
{
    long ldata[4];
    inv_error_t result = inv_get_quaternion(ldata);
    data[0] = inv_q30_to_float(ldata[0]);
    data[1] = inv_q30_to_float(ldata[1]);
    data[2] = inv_q30_to_float(ldata[2]);
    data[3] = inv_q30_to_float(ldata[3]);
    return result;
}

/** Returns a quaternion with accuracy and timestamp.
 * @param[out] data 9-axis quaternion scaled such that 1.0 = 2^30.
 * @param[out] accuracy Accuracy of quaternion, 0-3, where 3 is most accurate.
 * @param[out] timestamp Timestamp of this quaternion in nanoseconds
 */
void inv_get_quaternion_set(long *data, int *accuracy, inv_time_t *timestamp)
{
    inv_get_quaternion(data);
    *timestamp = inv_get_last_timestamp();
    if (inv_get_compass_on()) {
        *accuracy = inv_get_mag_accuracy();
    } else if (inv_get_gyro_on()) {
        *accuracy = inv_get_gyro_accuracy();
    }else if (inv_get_accel_on()) {
        *accuracy = inv_get_accel_accuracy();
    } else {
        *accuracy = 0;
    }
}

/** Callback that gets called everytime there is new data. It is 
 * registered by inv_start_results_holder().
 * @param[in] sensor_cal New sensor data to process.
 * @return Returns INV_SUCCESS if successful or an error code if not.
 */
inv_error_t inv_generate_results(struct inv_sensor_cal_t *sensor_cal)
{
    rh.sensor = sensor_cal;
    return INV_SUCCESS;
}

/** Function to turn on this module. This is automatically called by
 *  inv_enable_results_holder(). Typically not called by users.
 * @return Returns INV_SUCCESS if successful or an error code if not.
 */
inv_error_t inv_start_results_holder(void)
{
    inv_register_data_cb(inv_generate_results, INV_PRIORITY_RESULTS_HOLDER,
        INV_GYRO_NEW | INV_ACCEL_NEW | INV_MAG_NEW);
    return INV_SUCCESS;
}

/** Initializes results holder. This is called automatically by the
* enable function inv_enable_results_holder(). It may be called any time the feature is enabled, but
* is typically not needed to be called by outside callers.
* @return Returns INV_SUCCESS if successful or an error code if not.
*/
inv_error_t inv_init_results_holder(void)
{
    memset(&rh, 0, sizeof(rh));
    rh.mag_scale[0] = 1L<<30;
    rh.mag_scale[1] = 1L<<30;
    rh.mag_scale[2] = 1L<<30;
    rh.compass_correction[0] = 1L<<30;
    rh.gam_quat[0] = 1L<<30;
    rh.nav_quat[0] = 1L<<30;
    rh.quat_confidence_interval = (float)M_PI;
    return INV_SUCCESS;
}

/** Turns on storage of results.
*/
inv_error_t inv_enable_results_holder()
{
    inv_error_t result;
    result = inv_init_results_holder();
    if ( result ) {
        return result;
    }

    result = inv_register_mpl_start_notification(inv_start_results_holder);
    return result;
}

/** Sets state of if we know the compass bias.
 * @return return 1 if we know the compass bias, 0 if not.
 *            it is set with inv_set_compass_bias_found()
 */
int inv_got_compass_bias()
{
    return rh.got_compass_bias;
}

/** Sets whether we know the compass bias
 * @param[in] state Set to 1 if we know the compass bias. 
 *            Can be retrieved with inv_got_compass_bias()
 */
void inv_set_compass_bias_found(int state)
{
    rh.got_compass_bias = state;
}

/** Sets the compass state.
 * @param[in] state Compass state. It can be retrieved with inv_get_compass_state().
 */
void inv_set_compass_state(int state)
{
    rh.compass_state = state;
}

/** Get's the compass state
 * @return the compass state that was set with inv_set_compass_state()
 */
int inv_get_compass_state()
{
    return rh.compass_state;
}

/** Set compass bias error. See inv_get_compass_bias_error()
 * @param[in] bias_error Set's how accurate we know the compass bias. It is the 
 * error squared.
 */
void inv_set_compass_bias_error(const long *bias_error)
{
    memcpy(rh.compass_bias_error, bias_error, sizeof(rh.compass_bias_error));
}

/** Get's compass bias error. See inv_set_compass_bias_error() for setting.
 * @param[out] bias_error Accuracy as to how well the compass bias is known. It is the error squared.
 */
void inv_get_compass_bias_error(long *bias_error)
{
    memcpy(bias_error, rh.compass_bias_error, sizeof(rh.compass_bias_error));
}

/**
 *  @brief      Returns 3-element vector of accelerometer data in body frame
 *                with gravity removed
 *  @param[out] data    3-element vector of accelerometer data in body frame
 *                with gravity removed
 *  @return     INV_SUCCESS if successful
 *              INV_ERROR_INVALID_PARAMETER if invalid input pointer
 */
inv_error_t inv_get_linear_accel(long *data)
{
    long gravity[3];

    if (data != NULL)
    {
        inv_get_accel_set(data, NULL, NULL);
        inv_get_gravity(gravity);
        data[0] -= gravity[0] >> 14;
        data[1] -= gravity[1] >> 14;
        data[2] -= gravity[2] >> 14;
        return INV_SUCCESS;
    }
    else {
        return INV_ERROR_INVALID_PARAMETER;
    }
}

/**
 *  @brief      Returns 3-element vector of accelerometer data in body frame
 *  @param[out] data    3-element vector of accelerometer data in body frame
 *  @return     INV_SUCCESS if successful
 *              INV_ERROR_INVALID_PARAMETER if invalid input pointer
 */
inv_error_t inv_get_accel(long *data)
{
    if (data != NULL) {
        inv_get_accel_set(data, NULL, NULL);
        return INV_SUCCESS;
    }
    else {
        return INV_ERROR_INVALID_PARAMETER;
    }
}

/**
 *  @brief      Returns 3-element vector of accelerometer float data
 *  @param[out] data    3-element vector of accelerometer float data
 *  @return     INV_SUCCESS if successful
 *              INV_ERROR_INVALID_PARAMETER if invalid input pointer
 */
inv_error_t inv_get_accel_float(float *data)
{
    long tdata[3];
    unsigned char i;

    if (data != NULL && !inv_get_accel(tdata)) {
        for (i = 0; i < 3; ++i) {
            data[i] = ((float)tdata[i] / (1L << 16));
        }
        return INV_SUCCESS;
    }
    else {
        return INV_ERROR_INVALID_PARAMETER;
    }
}

/**
 *  @brief      Returns 3-element vector of gyro float data
 *  @param[out] data    3-element vector of gyro float data
 *  @return     INV_SUCCESS if successful
 *              INV_ERROR_INVALID_PARAMETER if invalid input pointer
 */
inv_error_t inv_get_gyro_float(float *data)
{
    long tdata[3];
    unsigned char i;

    if (data != NULL) {
        inv_get_gyro_set(tdata, NULL, NULL);
        for (i = 0; i < 3; ++i) {
            data[i] = ((float)tdata[i] / (1L << 16));
        }
        return INV_SUCCESS;
    }
    else {
        return INV_ERROR_INVALID_PARAMETER;
    }
}

/** Set 9 axis 95% heading confidence interval for quaternion
* @param[in] ci Confidence interval in radians.
*/
void inv_set_heading_confidence_interval(float ci)
{
    rh.quat_confidence_interval = ci;
}

/** Get 9 axis 95% heading confidence interval for quaternion
* @return Confidence interval in radians.
*/
float inv_get_heading_confidence_interval(void)
{
    return rh.quat_confidence_interval;
}

/**
 *  @brief      Returns 3-element vector of linear accel float data
 *  @param[out] data    3-element vector of linear aceel float data
 *  @return     INV_SUCCESS if successful
 *              INV_ERROR_INVALID_PARAMETER if invalid input pointer
 */
inv_error_t inv_get_linear_accel_float(float *data)
{
    long tdata[3];
    unsigned char i;

    if (data != NULL && !inv_get_linear_accel(tdata)) {
        for (i = 0; i < 3; ++i) {
            data[i] = ((float)tdata[i] / (1L << 16));
        }
        return INV_SUCCESS;
    }
    else {
        return INV_ERROR_INVALID_PARAMETER;
    }
}

/**
 * @}
 */