/*
 * This file is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This file is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#pragma once

#include "AP_Compass_config.h"

#if AP_COMPASS_AK09916_ENABLED

#include <AP_Common/AP_Common.h>
#include <AP_HAL/AP_HAL.h>
#include <AP_HAL/I2CDevice.h>
#include <AP_Math/AP_Math.h>

#include "AP_Compass.h"
#include "AP_Compass_Backend.h"

#ifndef HAL_COMPASS_AK09916_I2C_ADDR
# define HAL_COMPASS_AK09916_I2C_ADDR 0x0C
#endif


#ifndef HAL_COMPASS_ICM20948_I2C_ADDR
# define HAL_COMPASS_ICM20948_I2C_ADDR 0x69
#endif

#ifndef HAL_COMPASS_ICM20948_I2C_ADDR2
# define HAL_COMPASS_ICM20948_I2C_ADDR2 0x68
#endif

class AuxiliaryBus;
class AuxiliaryBusSlave;
class AP_InertialSensor;
class AP_AK09916_BusDriver;

class AP_Compass_AK09916 : public AP_Compass_Backend
{
public:
    /* Probe for AK09916 standalone on I2C bus */
    static AP_Compass_Backend *probe(AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev,
                                     bool force_external,
                                     enum Rotation rotation);

#if AP_COMPASS_ICM20948_ENABLED
    /* Probe for AK09916 on auxiliary bus of ICM20948, connected through I2C */
    static AP_Compass_Backend *probe_ICM20948(AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev,
                                             AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev_icm,
                                             bool force_external,
                                             enum Rotation rotation);

    /* Probe for AK09916 on auxiliary bus of ICM20948, connected through SPI by default */
    static AP_Compass_Backend *probe_ICM20948(uint8_t mpu9250_instance, enum Rotation rotation);
    static AP_Compass_Backend *probe_ICM20948_SPI(uint8_t mpu9250_instance,
                                             enum Rotation rotation);

	/* Probe for AK09916 on auxiliary bus of ICM20948, connected through I2C */
    static AP_Compass_Backend *probe_ICM20948_I2C(uint8_t mpu9250_instance,
                                             enum Rotation rotation);
#endif

    static constexpr const char *name = "AK09916";

    virtual ~AP_Compass_AK09916();

    void read() override;

    /* Must be public so the BusDriver can access its definition */
    struct PACKED sample_regs {
        uint8_t st1;
        int16_t val[3];
        uint8_t tmps;
        uint8_t st2;
    };

private:
    AP_Compass_AK09916(AP_AK09916_BusDriver *bus, bool force_external,
                       enum Rotation rotation);

    bool init();
    void _make_factory_sensitivity_adjustment(Vector3f &field) const;
    void _make_adc_sensitivity_adjustment(Vector3f &field) const;

    bool _reset();
    bool _setup_mode();
    bool _check_id();
    bool _calibrate();

    void _update();

    AP_AK09916_BusDriver *_bus;

    bool _force_external;
    uint8_t _compass_instance;
    bool _initialized;
    enum Rotation _rotation;
    enum AP_Compass_Backend::DevTypes _devtype;
    uint8_t no_data;
};


class AP_AK09916_BusDriver
{
public:
    virtual ~AP_AK09916_BusDriver() { }

    virtual bool block_read(uint8_t reg, uint8_t *buf, uint32_t size) = 0;
    virtual bool register_read(uint8_t reg, uint8_t *val) = 0;
    virtual bool register_write(uint8_t reg, uint8_t val, bool checked=false) = 0;

    virtual AP_HAL::Semaphore  *get_semaphore() = 0;

    virtual bool configure() { return true; }
    virtual bool start_measurements() { return true; }
    virtual AP_HAL::Device::PeriodicHandle register_periodic_callback(uint32_t, AP_HAL::Device::PeriodicCb) = 0;

    // set device type within a device class
    virtual void set_device_type(uint8_t devtype) = 0;

    // return 24 bit bus identifier
    virtual uint32_t get_bus_id(void) const = 0;

    /**
     setup for register value checking. Frequency is how often to
     check registers. If set to 10 then every 10th call to
     check_next_register will check a register
     */
    virtual void setup_checked_registers(uint8_t num_regs) {}
    virtual void check_next_register(void) {}
};

class AP_AK09916_BusDriver_HALDevice: public AP_AK09916_BusDriver
{
public:
    AP_AK09916_BusDriver_HALDevice(AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev);

    virtual bool block_read(uint8_t reg, uint8_t *buf, uint32_t size) override;
    virtual bool register_read(uint8_t reg, uint8_t *val) override;
    virtual bool register_write(uint8_t reg, uint8_t val, bool checked) override;

    virtual AP_HAL::Semaphore  *get_semaphore() override;
    AP_HAL::Device::PeriodicHandle register_periodic_callback(uint32_t period_usec, AP_HAL::Device::PeriodicCb) override;

    // set device type within a device class
    void set_device_type(uint8_t devtype) override {
        _dev->set_device_type(devtype);
    }

    // return 24 bit bus identifier
    uint32_t get_bus_id(void) const override {
        return _dev->get_bus_id();
    }

    /**
     setup for register value checking. Frequency is how often to
     check registers. If set to 10 then every 10th call to
     check_next_register will check a register
     */
    void setup_checked_registers(uint8_t num_regs) override {
        _dev->setup_checked_registers(num_regs);
    }
    void check_next_register(void) override {
        _dev->check_next_register();
    }
    
private:
    AP_HAL::OwnPtr<AP_HAL::I2CDevice> _dev;
};

class AP_AK09916_BusDriver_Auxiliary : public AP_AK09916_BusDriver
{
public:
    AP_AK09916_BusDriver_Auxiliary(AP_InertialSensor &ins, uint8_t backend_id,
                                  uint8_t backend_instance, uint8_t addr);
    ~AP_AK09916_BusDriver_Auxiliary();

    bool block_read(uint8_t reg, uint8_t *buf, uint32_t size) override;
    bool register_read(uint8_t reg, uint8_t *val) override;
    bool register_write(uint8_t reg, uint8_t val, bool checked) override;

    AP_HAL::Device::PeriodicHandle register_periodic_callback(uint32_t period_usec, AP_HAL::Device::PeriodicCb) override;
    
    AP_HAL::Semaphore  *get_semaphore() override;

    bool configure() override;
    bool start_measurements() override;

    // set device type within a device class
    void set_device_type(uint8_t devtype) override;

    // return 24 bit bus identifier
    uint32_t get_bus_id(void) const override;
    
private:
    AuxiliaryBus *_bus;
    AuxiliaryBusSlave *_slave;
    bool _started;
};

#endif  // AP_COMPASS_AK09916_ENABLED