#include <array>

#include <vector>

#include <memory>

#include <unistd.h>

#include <cassert>

#include <hidapi/hidapi.h>

using Packet = std::vector<uint8_t>;

static_assert(sizeof (uint8_t) == sizeof (unsigned char)); // unsigned char is used in the HID API library

class HIDException {

private:

	std::wstring message;

public:

	HIDException(std::wstring message) : message(message) {

	}

	virtual ~HIDException() {

	}

	const std::wstring getMessage() const {

		return message;

	}

};

class HIDDevice {

private:

	std::shared_ptr<hid_device> handle;

public:

	HIDDevice(unsigned short vendorId, unsigned short productId, const wchar_t *serialNumber) {

		int initError = hid_init(); // TODO: move to HIDContext class?

		if (initError) throw HIDException(L"Unable to init HID API.");

		handle.reset(hid_open(vendorId, productId, serialNumber), hid_close);

	}

	virtual ~HIDDevice() {

		hid_exit(); // TODO: move to HIDContext class?

	}

	const std::wstring getManufacturerName() const {

		std::array<wchar_t, 200 > buffer;

		int error = hid_get_manufacturer_string(handle.get(), buffer.data(), buffer.size());

		if (error) throw HIDException(L"Unable to get manufacturer name.");

		return buffer.data();

	}

	const std::wstring getProductName() const {

		std::array<wchar_t, 200 > buffer;

		int error = hid_get_product_string(handle.get(), buffer.data(), buffer.size());

		if (error) throw HIDException(L"Unable to get product name.");

		return buffer.data();

	}

	const std::wstring getSerialNumber() const {

		std::array<wchar_t, 200 > buffer;

		int error = hid_get_serial_number_string(handle.get(), buffer.data(), buffer.size());

		if (error) throw HIDException(L"Unable to get serial number.");

		return buffer.data();

	}

	void sendFeatureReport(Packet data) {

		int written = hid_send_feature_report(handle.get(), data.data(), data.size());

		if (written < 0) throw HIDException(L"Unable to send feature report.");

	}

};