#define MS_CLASS "DepLibSRTP"
// #define MS_LOG_DEV_LEVEL 3

#include "DepLibSRTP.hpp"
#include "Logger.hpp"
#include "MediaSoupErrors.hpp"
#include <mutex>

/* Static variables. */

static std::mutex GlobalSyncMutex;
static size_t GlobalInstances = 0;

// clang-format off
std::vector<const char*> DepLibSRTP::errors =
{
	// From 0 (srtp_err_status_ok) to 24 (srtp_err_status_pfkey_err).
	"success (srtp_err_status_ok)",
	"unspecified failure (srtp_err_status_fail)",
	"unsupported parameter (srtp_err_status_bad_param)",
	"couldn't allocate memory (srtp_err_status_alloc_fail)",
	"couldn't deallocate memory (srtp_err_status_dealloc_fail)",
	"couldn't initialize (srtp_err_status_init_fail)",
	"can’t process as much data as requested (srtp_err_status_terminus)",
	"authentication failure (srtp_err_status_auth_fail)",
	"cipher failure (srtp_err_status_cipher_fail)",
	"replay check failed (bad index) (srtp_err_status_replay_fail)",
	"replay check failed (index too old) (srtp_err_status_replay_old)",
	"algorithm failed test routine (srtp_err_status_algo_fail)",
	"unsupported operation (srtp_err_status_no_such_op)",
	"no appropriate context found (srtp_err_status_no_ctx)",
	"unable to perform desired validation (srtp_err_status_cant_check)",
	"can’t use key any more (srtp_err_status_key_expired)",
	"error in use of socket (srtp_err_status_socket_err)",
	"error in use POSIX signals (srtp_err_status_signal_err)",
	"nonce check failed (srtp_err_status_nonce_bad)",
	"couldn’t read data (srtp_err_status_read_fail)",
	"couldn’t write data (srtp_err_status_write_fail)",
	"error parsing data (srtp_err_status_parse_err)",
	"error encoding data (srtp_err_status_encode_err)",
	"error while using semaphores (srtp_err_status_semaphore_err)",
	"error while using pfkey (srtp_err_status_pfkey_err)"
};
// clang-format on

/* Static methods. */

void DepLibSRTP::ClassInit()
{
	MS_TRACE();

	{
		const std::lock_guard<std::mutex> lock(GlobalSyncMutex);

		if (GlobalInstances == 0)
		{
			MS_DEBUG_TAG(info, "libsrtp version: \"%s\"", srtp_get_version_string());

			const srtp_err_status_t err = srtp_init();

			if (DepLibSRTP::IsError(err))
			{
				MS_THROW_ERROR("srtp_init() failed: %s", DepLibSRTP::GetErrorString(err));
			}
		}

		++GlobalInstances;
	}
}

void DepLibSRTP::ClassDestroy()
{
	MS_TRACE();

	{
		const std::lock_guard<std::mutex> lock(GlobalSyncMutex);
		--GlobalInstances;

		if (GlobalInstances == 0)
		{
			srtp_shutdown();
		}
	}
}