/*
 * StarPU
 * Copyright (C) INRIA 2008-2009 (see AUTHORS file)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * See the GNU Lesser General Public License in COPYING.LGPL for more details.
 */

#include <datawizard/data_parameters.h>
#include <datawizard/coherency.h>
#include <datawizard/copy-driver.h>
#include <datawizard/hierarchy.h>
#include <starpu.h>

#include <common/hash.h>

#ifdef USE_CUDA
#include <cuda.h>
#endif

/*
 * BCSR : blocked CSR, we use blocks of size (r x c)
 */
size_t allocate_bcsr_buffer_on_node(struct starpu_data_state_t *state, uint32_t dst_node);
void liberate_bcsr_buffer_on_node(starpu_data_interface_t *interface, uint32_t node);
size_t dump_bcsr_interface(starpu_data_interface_t *interface, void *_buffer);
int do_copy_bcsr_buffer_1_to_1(struct starpu_data_state_t *state, uint32_t src_node, uint32_t dst_node);
size_t bcsr_interface_get_size(struct starpu_data_state_t *state);
uint32_t footprint_bcsr_interface_crc32(data_state *state, uint32_t hstate);

struct data_interface_ops_t interface_bcsr_ops = {
	.allocate_data_on_node = allocate_bcsr_buffer_on_node,
	.liberate_data_on_node = liberate_bcsr_buffer_on_node,
	.copy_data_1_to_1 = do_copy_bcsr_buffer_1_to_1,
	.dump_data_interface = dump_bcsr_interface,
	.get_size = bcsr_interface_get_size,
	.interfaceid = BCSR_INTERFACE,
	.footprint = footprint_bcsr_interface_crc32
};

void starpu_register_bcsr_data(struct starpu_data_state_t **handle, uint32_t home_node,
		uint32_t nnz, uint32_t nrow, uintptr_t nzval, uint32_t *colind, uint32_t *rowptr, uint32_t firstentry,  uint32_t r, uint32_t c, size_t elemsize)
{
	struct starpu_data_state_t *state = calloc(1, sizeof(struct starpu_data_state_t));
	STARPU_ASSERT(state);

	STARPU_ASSERT(handle);
	*handle = state;

	unsigned node;
	for (node = 0; node < MAXNODES; node++)
	{
		starpu_bcsr_interface_t *local_interface = &state->interface[node].bcsr;

		if (node == home_node) {
			local_interface->nzval = nzval;
			local_interface->colind = colind;
			local_interface->rowptr = rowptr;
		}
		else {
			local_interface->nzval = 0;
			local_interface->colind = NULL;
			local_interface->rowptr = NULL;
		}

		local_interface->nnz = nnz;
		local_interface->nrow = nrow;
		local_interface->firstentry = firstentry;
		local_interface->r = r;
		local_interface->c = c;
		local_interface->elemsize = elemsize;
	}

	state->ops = &interface_bcsr_ops;

	register_new_data(state, home_node, 0);
}

static inline uint32_t footprint_bcsr_interface_generic(uint32_t (*hash_func)(uint32_t input, uint32_t hstate), data_state *state, uint32_t hstate)
{
	uint32_t hash;

	hash = hstate;
	hash = hash_func(starpu_get_bcsr_nnz(state), hash);
	hash = hash_func(starpu_get_bcsr_c(state), hash);
	hash = hash_func(starpu_get_bcsr_r(state), hash);

	return hash;
}

uint32_t footprint_bcsr_interface_crc32(data_state *state, uint32_t hstate)
{
	return footprint_bcsr_interface_generic(crc32_be, state, hstate);
}



struct dumped_bcsr_interface_s {
	uint32_t nnz;
	uint32_t nrow;
	uintptr_t nzval;
	uint32_t *colind;
	uint32_t *rowptr;
	uint32_t firstentry;
	uint32_t r;
	uint32_t c;
	uint32_t elemsize;
}  __attribute__ ((packed));

size_t dump_bcsr_interface(starpu_data_interface_t *interface, void *_buffer)
{
	/* yes, that's DIRTY ... */
	struct dumped_bcsr_interface_s *buffer = _buffer;

	buffer->nnz = (*interface).bcsr.nnz;
	buffer->nrow = (*interface).bcsr.nrow;
	buffer->nzval = (*interface).bcsr.nzval;
	buffer->colind = (*interface).bcsr.colind;
	buffer->rowptr = (*interface).bcsr.rowptr;
	buffer->firstentry = (*interface).bcsr.firstentry;
	buffer->r = (*interface).bcsr.r;
	buffer->c = (*interface).bcsr.c;
	buffer->elemsize = (*interface).bcsr.elemsize;

	return (sizeof(struct dumped_bcsr_interface_s));
}

/* offer an access to the data parameters */
uint32_t starpu_get_bcsr_nnz(struct starpu_data_state_t *state)
{
	return (state->interface[0].bcsr.nnz);
}

uint32_t starpu_get_bcsr_nrow(struct starpu_data_state_t *state)
{
	return (state->interface[0].bcsr.nrow);
}

uint32_t starpu_get_bcsr_firstentry(struct starpu_data_state_t *state)
{
	return (state->interface[0].bcsr.firstentry);
}

uint32_t starpu_get_bcsr_r(struct starpu_data_state_t *state)
{
	return (state->interface[0].bcsr.r);
}

uint32_t starpu_get_bcsr_c(struct starpu_data_state_t *state)
{
	return (state->interface[0].bcsr.c);
}

size_t starpu_get_bcsr_elemsize(struct starpu_data_state_t *state)
{
	return (state->interface[0].bcsr.elemsize);
}

uintptr_t starpu_get_bcsr_local_nzval(struct starpu_data_state_t *state)
{
	unsigned node;
	node = get_local_memory_node();

	STARPU_ASSERT(state->per_node[node].allocated);

	return (state->interface[node].bcsr.nzval);
}

uint32_t *starpu_get_bcsr_local_colind(struct starpu_data_state_t *state)
{
//	unsigned node;
//	node = get_local_memory_node();
//
//	STARPU_ASSERT(state->per_node[node].allocated);
//
//	return (state->interface[node].bcsr.colind);

	/* XXX */
	return (state->interface[0].bcsr.colind);
}

uint32_t *starpu_get_bcsr_local_rowptr(struct starpu_data_state_t *state)
{
//	unsigned node;
//	node = get_local_memory_node();
//
//	STARPU_ASSERT(state->per_node[node].allocated);
//
//	return (state->interface[node].bcsr.rowptr);
	
	/* XXX */
	return (state->interface[0].bcsr.rowptr);
}


size_t bcsr_interface_get_size(struct starpu_data_state_t *state)
{
	size_t size;

	uint32_t nnz = starpu_get_bcsr_nnz(state);
	uint32_t nrow = starpu_get_bcsr_nrow(state);
	uint32_t r = starpu_get_bcsr_r(state);
	uint32_t c = starpu_get_bcsr_c(state);
	size_t elemsize = starpu_get_bcsr_elemsize(state);

	size = nnz*r*c*elemsize + nnz*sizeof(uint32_t) + (nrow+1)*sizeof(uint32_t); 

	return size;
}


/* memory allocation/deallocation primitives for the BLAS interface */

/* returns the size of the allocated area */
size_t allocate_bcsr_buffer_on_node(struct starpu_data_state_t *state, uint32_t dst_node)
{
	uintptr_t addr_nzval;
	uint32_t *addr_colind, *addr_rowptr;
	size_t allocated_memory;

	/* we need the 3 arrays to be allocated */

	uint32_t nnz = state->interface[dst_node].bcsr.nnz;
	uint32_t nrow = state->interface[dst_node].bcsr.nrow;
	size_t elemsize = state->interface[dst_node].bcsr.elemsize;

	uint32_t r = state->interface[dst_node].bcsr.r;
	uint32_t c = state->interface[dst_node].bcsr.c;

	node_kind kind = get_node_kind(dst_node);

	switch(kind) {
		case RAM:
			addr_nzval = (uintptr_t)malloc(nnz*r*c*elemsize);
			if (!addr_nzval)
				goto fail_nzval;

			addr_colind = malloc(nnz*sizeof(uint32_t));
			if (!addr_colind)
				goto fail_colind;

			addr_rowptr = malloc((nrow+1)*sizeof(uint32_t));
			if (!addr_rowptr)
				goto fail_rowptr;

			break;
#ifdef USE_CUDA
		case CUDA_RAM:
			cublasAlloc(nnz*r*c, elemsize, (void **)&addr_nzval);
			if (!addr_nzval)
				goto fail_nzval;

			cublasAlloc(nnz, sizeof(uint32_t), (void **)&addr_colind);
			if (!addr_colind)
				goto fail_colind;

			cublasAlloc((nrow+1), sizeof(uint32_t), (void **)&addr_rowptr);
			if (!addr_rowptr)
				goto fail_rowptr;

			break;
#endif
		default:
			assert(0);
	}

	/* allocation succeeded */
	allocated_memory = 
		nnz*r*c*elemsize + nnz*sizeof(uint32_t) + (nrow+1)*sizeof(uint32_t);

	/* update the data properly in consequence */
	state->interface[dst_node].bcsr.nzval = addr_nzval;
	state->interface[dst_node].bcsr.colind = addr_colind;
	state->interface[dst_node].bcsr.rowptr = addr_rowptr;
	
	return allocated_memory;

fail_rowptr:
	switch(kind) {
		case RAM:
			free((void *)addr_colind);
#ifdef USE_CUDA
		case CUDA_RAM:
			cublasFree((void*)addr_colind);
			break;
#endif
		default:
			assert(0);
	}

fail_colind:
	switch(kind) {
		case RAM:
			free((void *)addr_nzval);
#ifdef USE_CUDA
		case CUDA_RAM:
			cublasFree((void*)addr_nzval);
			break;
#endif
		default:
			assert(0);
	}

fail_nzval:

	/* allocation failed */
	allocated_memory = 0;

	return allocated_memory;
}

void liberate_bcsr_buffer_on_node(starpu_data_interface_t *interface, uint32_t node)
{
	node_kind kind = get_node_kind(node);
	switch(kind) {
		case RAM:
			free((void*)interface->bcsr.nzval);
			free((void*)interface->bcsr.colind);
			free((void*)interface->bcsr.rowptr);
			break;
#ifdef USE_CUDA
		case CUDA_RAM:
			cublasFree((void*)interface->bcsr.nzval);
			cublasFree((void*)interface->bcsr.colind);
			cublasFree((void*)interface->bcsr.rowptr);
			break;
#endif
		default:
			assert(0);
	}
}

#ifdef USE_CUDA
static void copy_cublas_to_ram(struct starpu_data_state_t *state, uint32_t src_node, uint32_t dst_node)
{
	starpu_bcsr_interface_t *src_bcsr;
	starpu_bcsr_interface_t *dst_bcsr;

	src_bcsr = &state->interface[src_node].bcsr;
	dst_bcsr = &state->interface[dst_node].bcsr;

	uint32_t nnz = src_bcsr->nnz;
	uint32_t nrow = src_bcsr->nrow;
	size_t elemsize = src_bcsr->elemsize;

	uint32_t r = src_bcsr->r;
	uint32_t c = src_bcsr->c;

	cublasGetVector(nnz*r*c, elemsize, (uint8_t *)src_bcsr->nzval, 1, 
			 		   (uint8_t *)dst_bcsr->nzval, 1);

	cublasGetVector(nnz, sizeof(uint32_t), (uint8_t *)src_bcsr->colind, 1, 
						(uint8_t *)dst_bcsr->colind, 1);

	cublasGetVector((nrow+1), sizeof(uint32_t), (uint8_t *)src_bcsr->rowptr, 1, 
						(uint8_t *)dst_bcsr->rowptr, 1);
	
	TRACE_DATA_COPY(src_node, dst_node, nnz*r*c*elemsize + (nnz+nrow+1)*sizeof(uint32_t));

}

static void copy_ram_to_cublas(struct starpu_data_state_t *state, uint32_t src_node, uint32_t dst_node)
{
	starpu_bcsr_interface_t *src_bcsr;
	starpu_bcsr_interface_t *dst_bcsr;

	src_bcsr = &state->interface[src_node].bcsr;
	dst_bcsr = &state->interface[dst_node].bcsr;

	uint32_t nnz = src_bcsr->nnz;
	uint32_t nrow = src_bcsr->nrow;
	size_t elemsize = src_bcsr->elemsize;

	uint32_t r = src_bcsr->r;
	uint32_t c = src_bcsr->c;

	cublasSetVector(nnz*r*c, elemsize, (uint8_t *)src_bcsr->nzval, 1, 
					(uint8_t *)dst_bcsr->nzval, 1);

	cublasSetVector(nnz, sizeof(uint32_t), (uint8_t *)src_bcsr->colind, 1, 
						(uint8_t *)dst_bcsr->colind, 1);

	cublasSetVector((nrow+1), sizeof(uint32_t), (uint8_t *)src_bcsr->rowptr, 1, 
						(uint8_t *)dst_bcsr->rowptr, 1);
	
	TRACE_DATA_COPY(src_node, dst_node, nnz*r*c*elemsize + (nnz+nrow+1)*sizeof(uint32_t));
}
#endif // USE_CUDA

/* as not all platform easily have a BLAS lib installed ... */
static void dummy_copy_ram_to_ram(struct starpu_data_state_t *state, uint32_t src_node, uint32_t dst_node)
{

	starpu_bcsr_interface_t *src_bcsr;
	starpu_bcsr_interface_t *dst_bcsr;

	src_bcsr = &state->interface[src_node].bcsr;
	dst_bcsr = &state->interface[dst_node].bcsr;

	uint32_t nnz = src_bcsr->nnz;
	uint32_t nrow = src_bcsr->nrow;
	size_t elemsize = src_bcsr->elemsize;

	uint32_t r = src_bcsr->r;
	uint32_t c = src_bcsr->c;

	memcpy((void *)dst_bcsr->nzval, (void *)src_bcsr->nzval, nnz*elemsize*r*c);

	memcpy((void *)dst_bcsr->colind, (void *)src_bcsr->colind, nnz*sizeof(uint32_t));

	memcpy((void *)dst_bcsr->rowptr, (void *)src_bcsr->rowptr, (nrow+1)*sizeof(uint32_t));

	TRACE_DATA_COPY(src_node, dst_node, nnz*elemsize*r*c + (nnz+nrow+1)*sizeof(uint32_t));
}


int do_copy_bcsr_buffer_1_to_1(struct starpu_data_state_t *state, uint32_t src_node, uint32_t dst_node)
{
	node_kind src_kind = get_node_kind(src_node);
	node_kind dst_kind = get_node_kind(dst_node);

	switch (dst_kind) {
	case RAM:
		switch (src_kind) {
			case RAM:
				/* RAM -> RAM */
				 dummy_copy_ram_to_ram(state, src_node, dst_node);
				 break;
#ifdef USE_CUDA
			case CUDA_RAM:
				/* CUBLAS_RAM -> RAM */
				/* only the proper CUBLAS thread can initiate this ! */
				if (get_local_memory_node() == src_node)
				{
					copy_cublas_to_ram(state, src_node, dst_node);
				}
				else
				{
					post_data_request(state, src_node, dst_node);
				}
				break;
#endif
			case SPU_LS:
				STARPU_ASSERT(0); // TODO
				break;
			case UNUSED:
				printf("error node %d UNUSED\n", src_node);
			default:
				assert(0);
				break;
		}
		break;
#ifdef USE_CUDA
	case CUDA_RAM:
		switch (src_kind) {
			case RAM:
				/* RAM -> CUBLAS_RAM */
				/* only the proper CUBLAS thread can initiate this ! */
				STARPU_ASSERT(get_local_memory_node() == dst_node);
				copy_ram_to_cublas(state, src_node, dst_node);
				break;
			case CUDA_RAM:
			case SPU_LS:
				STARPU_ASSERT(0); // TODO 
				break;
			case UNUSED:
			default:
				STARPU_ASSERT(0);
				break;
		}
		break;
#endif
	case SPU_LS:
		STARPU_ASSERT(0); // TODO
		break;
	case UNUSED:
	default:
		assert(0);
		break;
	}

	return 0;
}