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/**
 * @file MPU6500.hpp
 *
 * Driver for the Invensense MPU6500 connected via SPI.
 *
 */

#pragma once

#include "InvenSense_MPU6500_registers.hpp"

#include <drivers/drv_hrt.h>
#include <lib/drivers/accelerometer/PX4Accelerometer.hpp>
#include <lib/drivers/device/spi.h>
#include <lib/drivers/gyroscope/PX4Gyroscope.hpp>
#include <lib/ecl/geo/geo.h>
#include <lib/perf/perf_counter.h>
#include <px4_platform_common/atomic.h>
#include <px4_platform_common/i2c_spi_buses.h>

using namespace InvenSense_MPU6500;

class MPU6500 : public device::SPI, public I2CSPIDriver<MPU6500>
{
public:
	MPU6500(I2CSPIBusOption bus_option, int bus, uint32_t device, enum Rotation rotation, int bus_frequency,
		spi_mode_e spi_mode, spi_drdy_gpio_t drdy_gpio);
	~MPU6500() override;

	static I2CSPIDriverBase *instantiate(const BusCLIArguments &cli, const BusInstanceIterator &iterator,
					     int runtime_instance);
	static void print_usage();

	void RunImpl();

	int init() override;
	void print_status() override;

private:
	void exit_and_cleanup() override;

	// Sensor Configuration
	static constexpr float FIFO_SAMPLE_DT{1e6f / 8000.f};
	static constexpr uint32_t SAMPLES_PER_TRANSFER{2};                   // ensure at least 1 new accel sample per transfer
	static constexpr float GYRO_RATE{1e6f / FIFO_SAMPLE_DT};             // 8000 Hz gyro
	static constexpr float ACCEL_RATE{GYRO_RATE / SAMPLES_PER_TRANSFER}; // 4000 Hz accel

	// maximum FIFO samples per transfer is limited to the size of sensor_accel_fifo/sensor_gyro_fifo
	static constexpr uint32_t FIFO_MAX_SAMPLES{math::min(math::min(FIFO::SIZE / sizeof(FIFO::DATA), sizeof(sensor_gyro_fifo_s::x) / sizeof(sensor_gyro_fifo_s::x[0])), sizeof(sensor_accel_fifo_s::x) / sizeof(sensor_accel_fifo_s::x[0]) * (int)(GYRO_RATE / ACCEL_RATE))};

	// Transfer data
	struct FIFOTransferBuffer {
		uint8_t cmd{static_cast<uint8_t>(Register::FIFO_R_W) | DIR_READ};
		FIFO::DATA f[FIFO_MAX_SAMPLES] {};
	};
	// ensure no struct padding
	static_assert(sizeof(FIFOTransferBuffer) == (1 + FIFO_MAX_SAMPLES *sizeof(FIFO::DATA)));

	struct register_config_t {
		Register reg;
		uint8_t set_bits{0};
		uint8_t clear_bits{0};
	};

	int probe() override;

	bool Reset();

	bool Configure();
	void ConfigureAccel();
	void ConfigureGyro();
	void ConfigureSampleRate(int sample_rate);

	static int DataReadyInterruptCallback(int irq, void *context, void *arg);
	void DataReady();
	bool DataReadyInterruptConfigure();
	bool DataReadyInterruptDisable();

	bool RegisterCheck(const register_config_t &reg_cfg);

	uint8_t RegisterRead(Register reg);
	void RegisterWrite(Register reg, uint8_t value);
	void RegisterSetAndClearBits(Register reg, uint8_t setbits, uint8_t clearbits);

	uint16_t FIFOReadCount();
	bool FIFORead(const hrt_abstime &timestamp_sample, uint8_t samples);
	void FIFOReset();

	bool ProcessAccel(const hrt_abstime &timestamp_sample, const FIFO::DATA fifo[], const uint8_t samples);
	void ProcessGyro(const hrt_abstime &timestamp_sample, const FIFO::DATA fifo[], const uint8_t samples);
	void UpdateTemperature();

	const spi_drdy_gpio_t _drdy_gpio;

	PX4Accelerometer _px4_accel;
	PX4Gyroscope _px4_gyro;

	perf_counter_t _bad_register_perf{perf_alloc(PC_COUNT, MODULE_NAME": bad register")};
	perf_counter_t _bad_transfer_perf{perf_alloc(PC_COUNT, MODULE_NAME": bad transfer")};
	perf_counter_t _fifo_empty_perf{perf_alloc(PC_COUNT, MODULE_NAME": FIFO empty")};
	perf_counter_t _fifo_overflow_perf{perf_alloc(PC_COUNT, MODULE_NAME": FIFO overflow")};
	perf_counter_t _fifo_reset_perf{perf_alloc(PC_COUNT, MODULE_NAME": FIFO reset")};
	perf_counter_t _drdy_missed_perf{nullptr};

	hrt_abstime _reset_timestamp{0};
	hrt_abstime _last_config_check_timestamp{0};
	hrt_abstime _temperature_update_timestamp{0};
	int _failure_count{0};

	px4::atomic<uint32_t> _drdy_fifo_read_samples{0};
	px4::atomic<uint32_t> _drdy_count{0};
	bool _data_ready_interrupt_enabled{false};

	enum class STATE : uint8_t {
		RESET,
		WAIT_FOR_RESET,
		CONFIGURE,
		FIFO_READ,
	};

	STATE _state{STATE::RESET};

	uint16_t _fifo_empty_interval_us{1250}; // default 1250 us / 800 Hz transfer interval
	uint32_t _fifo_gyro_samples{static_cast<uint32_t>(_fifo_empty_interval_us / (1000000 / GYRO_RATE))};

	uint8_t _checked_register{0};
	static constexpr uint8_t size_register_cfg{9};
	register_config_t _register_cfg[size_register_cfg] {
		// Register               | Set bits, Clear bits
		{ Register::CONFIG,        CONFIG_BIT::FIFO_MODE | CONFIG_BIT::DLPF_CFG_BYPASS_DLPF_8KHZ, 0 },
		{ Register::GYRO_CONFIG,   GYRO_CONFIG_BIT::GYRO_FS_SEL_2000_DPS, GYRO_CONFIG_BIT::FCHOICE_B_8KHZ_BYPASS_DLPF },
		{ Register::ACCEL_CONFIG,  ACCEL_CONFIG_BIT::ACCEL_FS_SEL_16G, 0 },
		{ Register::ACCEL_CONFIG2, ACCEL_CONFIG2_BIT::ACCEL_FCHOICE_B_BYPASS_DLPF, 0 },
		{ Register::FIFO_EN,       FIFO_EN_BIT::GYRO_XOUT | FIFO_EN_BIT::GYRO_YOUT | FIFO_EN_BIT::GYRO_ZOUT | FIFO_EN_BIT::ACCEL, 0 },
		{ Register::INT_PIN_CFG,   INT_PIN_CFG_BIT::ACTL, 0 },
		{ Register::INT_ENABLE,    INT_ENABLE_BIT::RAW_RDY_EN, 0 },
		{ Register::USER_CTRL,     USER_CTRL_BIT::FIFO_EN, USER_CTRL_BIT::I2C_IF_DIS },
		{ Register::PWR_MGMT_1,    PWR_MGMT_1_BIT::CLKSEL_0, PWR_MGMT_1_BIT::SLEEP },
	};
};
