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// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#include <cstring>

#include "common/input.h"
#include "input_common/helpers/joycon_protocol/calibration.h"
#include "input_common/helpers/joycon_protocol/joycon_types.h"

namespace InputCommon::Joycon {

CalibrationProtocol::CalibrationProtocol(std::shared_ptr<JoyconHandle> handle)
    : JoyconCommonProtocol(std::move(handle)) {}

Common::Input::DriverResult CalibrationProtocol::GetLeftJoyStickCalibration(
    JoyStickCalibration& calibration) {
    ScopedSetBlocking sb(this);
    Common::Input::DriverResult result{Common::Input::DriverResult::Success};
    JoystickLeftSpiCalibration spi_calibration{};
    bool has_user_calibration = false;
    calibration = {};

    if (result == Common::Input::DriverResult::Success) {
        result = HasUserCalibration(SpiAddress::USER_LEFT_MAGIC, has_user_calibration);
    }

    // Read User defined calibration
    if (result == Common::Input::DriverResult::Success && has_user_calibration) {
        result = ReadSPI(SpiAddress::USER_LEFT_DATA, spi_calibration);
    }

    // Read Factory calibration
    if (result == Common::Input::DriverResult::Success && !has_user_calibration) {
        result = ReadSPI(SpiAddress::FACT_LEFT_DATA, spi_calibration);
    }

    if (result == Common::Input::DriverResult::Success) {
        calibration.x.center = GetXAxisCalibrationValue(spi_calibration.center);
        calibration.y.center = GetYAxisCalibrationValue(spi_calibration.center);
        calibration.x.min = GetXAxisCalibrationValue(spi_calibration.min);
        calibration.y.min = GetYAxisCalibrationValue(spi_calibration.min);
        calibration.x.max = GetXAxisCalibrationValue(spi_calibration.max);
        calibration.y.max = GetYAxisCalibrationValue(spi_calibration.max);
    }

    // Set a valid default calibration if data is missing
    ValidateCalibration(calibration);

    return result;
}

Common::Input::DriverResult CalibrationProtocol::GetRightJoyStickCalibration(
    JoyStickCalibration& calibration) {
    ScopedSetBlocking sb(this);
    Common::Input::DriverResult result{Common::Input::DriverResult::Success};
    JoystickRightSpiCalibration spi_calibration{};
    bool has_user_calibration = false;
    calibration = {};

    if (result == Common::Input::DriverResult::Success) {
        result = HasUserCalibration(SpiAddress::USER_RIGHT_MAGIC, has_user_calibration);
    }

    // Read User defined calibration
    if (result == Common::Input::DriverResult::Success && has_user_calibration) {
        result = ReadSPI(SpiAddress::USER_RIGHT_DATA, spi_calibration);
    }

    // Read Factory calibration
    if (result == Common::Input::DriverResult::Success && !has_user_calibration) {
        result = ReadSPI(SpiAddress::FACT_RIGHT_DATA, spi_calibration);
    }

    if (result == Common::Input::DriverResult::Success) {
        calibration.x.center = GetXAxisCalibrationValue(spi_calibration.center);
        calibration.y.center = GetYAxisCalibrationValue(spi_calibration.center);
        calibration.x.min = GetXAxisCalibrationValue(spi_calibration.min);
        calibration.y.min = GetYAxisCalibrationValue(spi_calibration.min);
        calibration.x.max = GetXAxisCalibrationValue(spi_calibration.max);
        calibration.y.max = GetYAxisCalibrationValue(spi_calibration.max);
    }

    // Set a valid default calibration if data is missing
    ValidateCalibration(calibration);

    return result;
}

Common::Input::DriverResult CalibrationProtocol::GetImuCalibration(MotionCalibration& calibration) {
    ScopedSetBlocking sb(this);
    Common::Input::DriverResult result{Common::Input::DriverResult::Success};
    ImuSpiCalibration spi_calibration{};
    bool has_user_calibration = false;
    calibration = {};

    if (result == Common::Input::DriverResult::Success) {
        result = HasUserCalibration(SpiAddress::USER_IMU_MAGIC, has_user_calibration);
    }

    // Read User defined calibration
    if (result == Common::Input::DriverResult::Success && has_user_calibration) {
        result = ReadSPI(SpiAddress::USER_IMU_DATA, spi_calibration);
    }

    // Read Factory calibration
    if (result == Common::Input::DriverResult::Success && !has_user_calibration) {
        result = ReadSPI(SpiAddress::FACT_IMU_DATA, spi_calibration);
    }

    if (result == Common::Input::DriverResult::Success) {
        calibration.accelerometer[0].offset = spi_calibration.accelerometer_offset[0];
        calibration.accelerometer[1].offset = spi_calibration.accelerometer_offset[1];
        calibration.accelerometer[2].offset = spi_calibration.accelerometer_offset[2];

        calibration.accelerometer[0].scale = spi_calibration.accelerometer_scale[0];
        calibration.accelerometer[1].scale = spi_calibration.accelerometer_scale[1];
        calibration.accelerometer[2].scale = spi_calibration.accelerometer_scale[2];

        calibration.gyro[0].offset = spi_calibration.gyroscope_offset[0];
        calibration.gyro[1].offset = spi_calibration.gyroscope_offset[1];
        calibration.gyro[2].offset = spi_calibration.gyroscope_offset[2];

        calibration.gyro[0].scale = spi_calibration.gyroscope_scale[0];
        calibration.gyro[1].scale = spi_calibration.gyroscope_scale[1];
        calibration.gyro[2].scale = spi_calibration.gyroscope_scale[2];
    }

    ValidateCalibration(calibration);

    return result;
}

Common::Input::DriverResult CalibrationProtocol::GetRingCalibration(RingCalibration& calibration,
                                                                    s16 current_value) {
    constexpr s16 DefaultRingRange{800};

    // TODO: Get default calibration form ring itself
    if (ring_data_max == 0 && ring_data_min == 0) {
        ring_data_max = current_value + DefaultRingRange;
        ring_data_min = current_value - DefaultRingRange;
        ring_data_default = current_value;
    }
    ring_data_max = std::max(ring_data_max, current_value);
    ring_data_min = std::min(ring_data_min, current_value);
    calibration = {
        .default_value = ring_data_default,
        .max_value = ring_data_max,
        .min_value = ring_data_min,
    };
    return Common::Input::DriverResult::Success;
}

Common::Input::DriverResult CalibrationProtocol::HasUserCalibration(SpiAddress address,
                                                                    bool& has_user_calibration) {
    MagicSpiCalibration spi_magic{};
    const Common::Input::DriverResult result{ReadSPI(address, spi_magic)};
    has_user_calibration = false;
    if (result == Common::Input::DriverResult::Success) {
        has_user_calibration = spi_magic.first == CalibrationMagic::USR_MAGIC_0 &&
                               spi_magic.second == CalibrationMagic::USR_MAGIC_1;
    }
    return result;
}

u16 CalibrationProtocol::GetXAxisCalibrationValue(std::span<u8> block) const {
    return static_cast<u16>(((block[1] & 0x0F) << 8) | block[0]);
}

u16 CalibrationProtocol::GetYAxisCalibrationValue(std::span<u8> block) const {
    return static_cast<u16>((block[2] << 4) | (block[1] >> 4));
}

void CalibrationProtocol::ValidateCalibration(JoyStickCalibration& calibration) {
    constexpr u16 DefaultStickCenter{0x800};
    constexpr u16 DefaultStickRange{0x6cc};

    calibration.x.center = ValidateValue(calibration.x.center, DefaultStickCenter);
    calibration.x.max = ValidateValue(calibration.x.max, DefaultStickRange);
    calibration.x.min = ValidateValue(calibration.x.min, DefaultStickRange);

    calibration.y.center = ValidateValue(calibration.y.center, DefaultStickCenter);
    calibration.y.max = ValidateValue(calibration.y.max, DefaultStickRange);
    calibration.y.min = ValidateValue(calibration.y.min, DefaultStickRange);
}

void CalibrationProtocol::ValidateCalibration(MotionCalibration& calibration) {
    constexpr s16 DefaultAccelerometerScale{0x4000};
    constexpr s16 DefaultGyroScale{0x3be7};
    constexpr s16 DefaultOffset{0};

    for (auto& sensor : calibration.accelerometer) {
        sensor.scale = ValidateValue(sensor.scale, DefaultAccelerometerScale);
        sensor.offset = ValidateValue(sensor.offset, DefaultOffset);
    }
    for (auto& sensor : calibration.gyro) {
        sensor.scale = ValidateValue(sensor.scale, DefaultGyroScale);
        sensor.offset = ValidateValue(sensor.offset, DefaultOffset);
    }
}

u16 CalibrationProtocol::ValidateValue(u16 value, u16 default_value) const {
    if (value == 0) {
        return default_value;
    }
    if (value == 0xFFF) {
        return default_value;
    }
    return value;
}

s16 CalibrationProtocol::ValidateValue(s16 value, s16 default_value) const {
    if (value == 0) {
        return default_value;
    }
    if (value == 0xFFF) {
        return default_value;
    }
    return value;
}

} // namespace InputCommon::Joycon