/*
 * luffa 80 algo (Introduced by Doomcoin)
 */
extern "C" {
#include "sph/sph_luffa.h"
}

#include "miner.h"

#include "cuda_helper.h"

static uint32_t *d_hash[MAX_GPUS];

extern void qubit_luffa512_cpu_init(int thr_id, uint32_t threads);
extern void qubit_luffa512_cpu_setBlock_80(void *pdata);
extern void qubit_luffa512_cpu_hash_80(int thr_id, uint32_t threads, uint32_t startNounce, uint32_t *d_hash, int order);

extern "C" void luffa_hash(void *state, const void *input)
{
	uint8_t _ALIGN(64) hash[64];

	sph_luffa512_context ctx_luffa;

	sph_luffa512_init(&ctx_luffa);
	sph_luffa512 (&ctx_luffa, input, 80);
	sph_luffa512_close(&ctx_luffa, (void*) hash);

	memcpy(state, hash, 32);
}

static bool init[MAX_GPUS] = { 0 };

extern "C" int scanhash_luffa(int thr_id, struct work* work, uint32_t max_nonce, unsigned long *hashes_done)
{
	uint32_t _ALIGN(64) endiandata[20];
	uint32_t *pdata = work->data;
	uint32_t *ptarget = work->target;
	const uint32_t first_nonce = pdata[19];
	uint32_t throughput = device_intensity(thr_id, __func__, 1U << 22); // 256*256*8*8
	throughput = min(throughput, max_nonce - first_nonce);

	if (opt_benchmark)
		((uint32_t*)ptarget)[7] = 0x0000f;

	if (!init[thr_id])
	{
		cudaSetDevice(device_map[thr_id]);
		if (opt_cudaschedule == -1) // to reduce cpu usage...
			cudaSetDeviceFlags(cudaDeviceScheduleBlockingSync);

		CUDA_SAFE_CALL(cudaMalloc(&d_hash[thr_id], throughput * 64));

		qubit_luffa512_cpu_init(thr_id, throughput);
		cuda_check_cpu_init(thr_id, throughput);

		init[thr_id] = true;
	}

	for (int k=0; k < 19; k++)
		be32enc(&endiandata[k], pdata[k]);

	qubit_luffa512_cpu_setBlock_80((void*)endiandata);
	cuda_check_cpu_setTarget(ptarget);

	do {
		int order = 0;
		*hashes_done = pdata[19] - first_nonce + throughput;

		qubit_luffa512_cpu_hash_80(thr_id, (int) throughput, pdata[19], d_hash[thr_id], order++);

		uint32_t foundNonce = cuda_check_hash(thr_id, throughput, pdata[19], d_hash[thr_id]);
		if (foundNonce != UINT32_MAX)
		{
			uint32_t _ALIGN(64) vhash64[8];
			be32enc(&endiandata[19], foundNonce);
			luffa_hash(vhash64, endiandata);

			if (vhash64[7] <= ptarget[7] && fulltest(vhash64, ptarget)) {
				work_set_target_ratio(work, vhash64);
				pdata[19] = foundNonce;
				return 1;
			} else {
				applog(LOG_WARNING, "GPU #%d: result for nonce %08x does not validate on CPU!", device_map[thr_id], foundNonce);
			}
		}

		if ((uint64_t) throughput + pdata[19] > max_nonce) {
			// pdata[19] = max_nonce;
			break;
		}

		pdata[19] += throughput;

	} while (!work_restart[thr_id].restart);

	*hashes_done = pdata[19] - first_nonce + 1;
	return 0;
}

// cleanup
extern "C" void free_luffa(int thr_id)
{
	if (!init[thr_id])
		return;

	cudaSetDevice(device_map[thr_id]);

	cudaFree(d_hash[thr_id]);

	cuda_check_cpu_free(thr_id);
	init[thr_id] = false;

	cudaDeviceSynchronize();
}