/*! \file */
/* ************************************************************************
 * Copyright (C) 2020-2024 Advanced Micro Devices, Inc. All rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * THE SOFTWARE.
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#pragma once

#include "common.h"

namespace rocsparse
{
    template <rocsparse_int BSR_BLOCK_DIM,
              rocsparse_int BLK_SIZE_Y,
              rocsparse_int UNROLL_SIZE_Y,
              typename T>
    ROCSPARSE_DEVICE_ILF void
        bsrmm_large_blockdim_device_ext(rocsparse_direction direction,
                                        rocsparse_operation trans_B,
                                        rocsparse_int       Mb,
                                        rocsparse_int       N,
                                        T                   alpha,
                                        const rocsparse_int* __restrict__ bsr_row_ptr,
                                        const rocsparse_int* __restrict__ bsr_col_ind,
                                        const T* __restrict__ bsr_val,
                                        rocsparse_int block_dim,
                                        const T* __restrict__ B,
                                        int64_t ldb,
                                        T       beta,
                                        T* __restrict__ C,
                                        int64_t              ldc,
                                        rocsparse_index_base idx_base)
    {
        const rocsparse_int tidx = hipThreadIdx_x, tidy = hipThreadIdx_y;

        const rocsparse_int global_row = tidx + hipBlockIdx_x * block_dim;

        __shared__ T shared_B[BSR_BLOCK_DIM * (BLK_SIZE_Y * UNROLL_SIZE_Y)];
        __shared__ T shared_A[BSR_BLOCK_DIM * BSR_BLOCK_DIM];

        T             sum[UNROLL_SIZE_Y]{};
        bool          col_valid[UNROLL_SIZE_Y]{};
        rocsparse_int cols[UNROLL_SIZE_Y]{};
        for(rocsparse_int l = 0; l < UNROLL_SIZE_Y; ++l)
        {
            cols[l]      = (tidy + BLK_SIZE_Y * l) + hipBlockIdx_y * (BLK_SIZE_Y * UNROLL_SIZE_Y);
            col_valid[l] = (cols[l] < N);
        }

        const rocsparse_int block_row = hipBlockIdx_x;
        const rocsparse_int block_row_start
            = (block_row < Mb) ? (bsr_row_ptr[block_row] - idx_base) : 0;
        const rocsparse_int block_row_end
            = (block_row < Mb) ? (bsr_row_ptr[block_row + 1] - idx_base) : 0;

        for(rocsparse_int l = 0; l < UNROLL_SIZE_Y; ++l)
        {
            sum[l] = static_cast<T>(0);
        }

        const rocsparse_int block_dim_sqr = block_dim * block_dim;
        const bool          is_tidx       = tidx < block_dim;
        const bool          is_tidy       = tidy < block_dim;
        const bool          is_tidx_tidy  = is_tidx && is_tidy;

        for(rocsparse_int k = block_row_start; k < block_row_end; k++)
        {
            const rocsparse_int block_col = (bsr_col_ind[k] - idx_base);
            if(is_tidx)
            {
                if(trans_B == rocsparse_operation_none)
                {
                    for(rocsparse_int l = 0; l < UNROLL_SIZE_Y; ++l)
                    {
                        if(col_valid[l])
                        {
                            shared_B[BSR_BLOCK_DIM * (BLK_SIZE_Y * l + tidy) + tidx]
                                = B[block_dim * block_col + tidx + cols[l] * ldb];
                        }
                    }
                }
                else
                {
                    for(rocsparse_int l = 0; l < UNROLL_SIZE_Y; ++l)
                    {
                        if(col_valid[l])
                        {
                            shared_B[BSR_BLOCK_DIM * (BLK_SIZE_Y * l + tidy) + tidx]
                                = B[cols[l] + ldb * (block_dim * block_col + tidx)];
                        }
                    }
                }
            }

            if(is_tidx_tidy)
            {
                if(direction == rocsparse_direction_row)
                {
                    shared_A[BSR_BLOCK_DIM * tidx + tidy]
                        = bsr_val[block_dim_sqr * k + block_dim * tidx + tidy];
                }
                else
                {
                    shared_A[BSR_BLOCK_DIM * tidx + tidy]
                        = bsr_val[block_dim_sqr * k + block_dim * tidy + tidx];
                }
            }

            __syncthreads();

            if(is_tidx)
            {
                for(rocsparse_int l = 0; l < UNROLL_SIZE_Y; ++l)
                {
                    if(col_valid[l])
                    {
                        for(rocsparse_int j = 0; j < block_dim; j++)
                        {
                            sum[l] = rocsparse::fma(
                                shared_A[BSR_BLOCK_DIM * tidx + j],
                                shared_B[BSR_BLOCK_DIM * (BLK_SIZE_Y * l + tidy) + j],
                                sum[l]);
                        }
                    }
                }
            }

            __syncthreads();
        }

        if(block_row < Mb && is_tidx)
        {
            for(rocsparse_int l = 0; l < UNROLL_SIZE_Y; ++l)
            {
                if(col_valid[l])
                {
                    if(beta == static_cast<T>(0))
                    {
                        C[global_row + cols[l] * ldc] = alpha * sum[l];
                    }
                    else
                    {
                        C[global_row + cols[l] * ldc]
                            = rocsparse::fma(beta, C[global_row + cols[l] * ldc], alpha * sum[l]);
                    }
                }
            }
        }
    }
}
