/* Copyright (C) The Scalable Software Infrastructure Project. All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:
   1. Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
   3. Neither the name of the project nor the names of its contributors 
      may be used to endorse or promote products derived from this software 
      without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE SCALABLE SOFTWARE INFRASTRUCTURE PROJECT
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE SCALABLE SOFTWARE INFRASTRUCTURE
   PROJECT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   POSSIBILITY OF SUCH DAMAGE.
*/

#ifdef HAVE_CONFIG_H
  #include "lis_config.h"
#else
#ifdef HAVE_CONFIG_WIN_H
  #include "lis_config_win.h"
#endif
#endif

#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_MALLOC_H
        #include <malloc.h>
#endif
#include <string.h>
#include <stdarg.h>
#include <ctype.h>
#include <math.h>
#ifdef _OPENMP
  #include <omp.h>
#endif
#ifdef USE_MPI
  #include <mpi.h>
#endif
#include "lislib.h"

/************************************************
 * lis_input_mm
 * lis_input_mm_vec
 * lis_input_mm_banner
 * lis_input_mm_size
 * lis_input_mm_csr
 ************************************************/

#undef __FUNC__
#define __FUNC__ "lis_input_mm"
LIS_INT lis_input_mm(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x, FILE *file)
{
  LIS_INT      err;
  LIS_INT      matrix_type;
  LIS_MATRIX  B;

  LIS_DEBUG_FUNC_IN;

  matrix_type = A->matrix_type;

  err = lis_input_mm_csr(A,b,x,file);
  if( err ) return err;

  if( matrix_type!=LIS_MATRIX_CSR )
  {
    err = lis_matrix_duplicate(A,&B);
    if( err ) return err;
    lis_matrix_set_type(B,matrix_type);
    err = lis_matrix_convert(A,B);
    if( err ) return err;
    lis_matrix_storage_destroy(A);
    lis_matrix_DLU_destroy(A);
    lis_matrix_diag_destroy(A->WD);
    if( A->l2g_map ) lis_free( A->l2g_map );
    if( A->commtable ) lis_commtable_destroy( A->commtable );
    if( A->ranges ) lis_free( A->ranges );
    err = lis_matrix_copy_struct(B,A);
    if( err ) return err;
    lis_free(B);
    if( A->matrix_type==LIS_MATRIX_JAD )
    {
      A->work = (LIS_SCALAR *)lis_malloc(A->n*sizeof(LIS_SCALAR),"lis_input_mm::A->work");
      if( A->work==NULL )
      {
        LIS_SETERR_MEM(A->n*sizeof(LIS_SCALAR));
        return LIS_OUT_OF_MEMORY;
      }
    }
  }


  LIS_DEBUG_FUNC_OUT;
  return LIS_SUCCESS;
}

#undef __FUNC__
#define __FUNC__ "lis_input_mm_vec"
LIS_INT lis_input_mm_vec(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x, FILE *file, LIS_INT isb, LIS_INT isx, LIS_INT isbin)
{
  char      buf[BUFSIZE];
  LIS_INT        i;
  LIS_INT        mode;
  LIS_INT        gn,n,is,ie;
  LIS_INT        idx;
  LIS_SCALAR    val;
  LIS_MM_VECFMT  vecfmt;

  LIS_DEBUG_FUNC_IN;

  if( isb==0 && isx==0 ) return LIS_SUCCESS;

  gn  = A->gn;
  n   = A->n;
  is  = A->is;
  ie  = A->ie;
  mode = 1;
  mode = *(char *)&mode;
  if( mode!=(isbin-1) )
  {
    mode = LIS_TRUE;      
  }
  else
  {
    mode = LIS_FALSE;
  }
  if( isb )
  {
    lis_vector_set_size(b,n,0);
    for(i=0;i<gn;i++)
    {
      if( isbin )
      {
        if( fread(&vecfmt, sizeof(vecfmt), 1, file)!=1 )
        {
          LIS_SETERR_FIO;
          return LIS_ERR_FILE_IO;
        }
        idx = vecfmt.i;
        val = vecfmt.value;
        if( mode )
        {
          lis_bswap_int(1,&idx);
          lis_bswap_scalar(1,&val);
        }
      }
      else
      {
        if( fgets(buf, BUFSIZE, file) == NULL )
        {
          LIS_SETERR_FIO;
          return LIS_ERR_FILE_IO;
        }
#ifdef _LONGLONG
#ifdef _LONG__DOUBLE
        if( sscanf(buf, "%lld %Lg", &idx, &val) != 2 )
#else
        if( sscanf(buf, "%lld %lg", &idx, &val) != 2 )
#endif
#else
#ifdef _LONG__DOUBLE
        if( sscanf(buf, "%d %Lg", &idx, &val) != 2 )
#else
        if( sscanf(buf, "%d %lg", &idx, &val) != 2 )
#endif
#endif
        {
          LIS_SETERR_FIO;
          return LIS_ERR_FILE_IO;
        }
      }
      idx--;
      if( idx>=is && idx<ie )
      {
        b->value[idx-is] = val;
      }
    }
  }
  if( isx )
  {
    lis_vector_set_size(x,n,0);
    for(i=0;i<gn;i++)
    {
      if( isbin )
      {
        if( fread(&vecfmt, sizeof(vecfmt), 1, file)!=1 )
        {
          LIS_SETERR_FIO;
          return LIS_ERR_FILE_IO;
        }
        idx = vecfmt.i;
        val = vecfmt.value;
        if( mode )
        {
          lis_bswap_int(1,&idx);
          lis_bswap_scalar(1,&val);
        }
      }
      else
      {
        if( fgets(buf, BUFSIZE, file) == NULL )
        {
          LIS_SETERR_FIO;
          return LIS_ERR_FILE_IO;
        }
#ifdef _LONGLONG
#ifdef _LONG__DOUBLE
        if( sscanf(buf, "%lld %Lg", &idx, &val) != 2 )
#else
        if( sscanf(buf, "%lld %Lg", &idx, &val) != 2 )
#endif
#else
#ifdef _LONG__DOUBLE
        if( sscanf(buf, "%d %Lg", &idx, &val) != 2 )
#else
        if( sscanf(buf, "%d %lg", &idx, &val) != 2 )
#endif
#endif
        {
          LIS_SETERR_FIO;
          return LIS_ERR_FILE_IO;
        }
      }
      idx--;
      if( idx>=is && idx<ie )
      {
        x->value[idx-is] = val;
      }
    }
  }

  LIS_DEBUG_FUNC_OUT;
  return LIS_SUCCESS;
}

#undef __FUNC__
#define __FUNC__ "lis_input_mm_banner"
LIS_INT lis_input_mm_banner(FILE *file, LIS_INT *mmtype)
{
  char      buf[BUFSIZE];
  char      banner[64], mtx[64], fmt[64], dtype[64], dstruct[64];
  char      *p;

  LIS_DEBUG_FUNC_IN;

  /* check banner */
  if( fgets(buf, BUFSIZE, file) == NULL )
  {
    LIS_SETERR_FIO;
    return LIS_ERR_FILE_IO;
  }
  sscanf(buf, "%s %s %s %s %s", banner, mtx, fmt, dtype, dstruct);

  for(p=mtx;*p!='\0';p++)     *p = (char)tolower(*p);
  for(p=fmt;*p!='\0';p++)     *p = (char)tolower(*p);
  for(p=dtype;*p!='\0';p++)   *p = (char)tolower(*p);
  for(p=dstruct;*p!='\0';p++) *p = (char)tolower(*p);

  if( strncmp(banner, MM_BANNER, strlen(MM_BANNER))!=0 || strncmp(mtx, MM_MTX, strlen(MM_MTX))!=0 )
  {
    LIS_SETERR(LIS_ERR_FILE_IO,"Not Matrix Market banner\n");
    return LIS_ERR_FILE_IO;
  }
  if( strncmp(fmt, MM_FMT, strlen(MM_FMT))!=0 )
  {
    LIS_SETERR(LIS_ERR_FILE_IO,"Not Coodinate format\n");
    return LIS_ERR_FILE_IO;
  }
  if( strncmp(dtype, MM_TYPE_REAL, strlen(MM_TYPE_REAL))!=0 )
  {
    LIS_SETERR(LIS_ERR_FILE_IO,"Not real\n");
    return LIS_ERR_FILE_IO;
  }
  if( strncmp(dstruct, MM_TYPE_GENERAL, strlen(MM_TYPE_GENERAL))==0 )
  {
    *mmtype = MM_GENERAL;
  }
  else if( strncmp(dstruct, MM_TYPE_SYMM, strlen(MM_TYPE_SYMM))==0)
  {
    *mmtype = MM_SYMM;
  }
  else
  {
    LIS_SETERR(LIS_ERR_FILE_IO,"Not general or symmetric\n");
    return LIS_ERR_FILE_IO;
  }
  LIS_DEBUG_FUNC_OUT;
  return LIS_SUCCESS;
}

#undef __FUNC__
#define __FUNC__ "lis_input_mm_size"
LIS_INT lis_input_mm_size(FILE *file, LIS_INT *nr, LIS_INT *nc, LIS_INT *nnz, LIS_INT *isb, LIS_INT *isx, LIS_INT *isbin)
{
  char      buf[BUFSIZE];
  LIS_INT        err;

  LIS_DEBUG_FUNC_IN;
  /* check size */    
  do
  {
    if( fgets(buf, BUFSIZE, file) == NULL )
    {
      LIS_SETERR_FIO;
      return LIS_ERR_FILE_IO;
    }
  }while( buf[0]=='%' );
#ifdef _LONGLONG
  err = sscanf(buf, "%lld %lld %lld %lld %lld %lld", nr, nc, nnz, isb, isx, isbin);
#else
  err = sscanf(buf, "%d %d %d %d %d %d", nr, nc, nnz, isb, isx, isbin);
#endif
  if( err==3 )
  {
    *isb   = 0;
    *isx   = 0;
    *isbin = 0;
  }
  else if( err==5 )
  {
    *isbin = 0;
  }

  if( *nr!=*nc )
  {
    LIS_SETERR(LIS_ERR_FILE_IO,"matrix is not square\n");
    return LIS_ERR_FILE_IO;
  }

  LIS_DEBUG_FUNC_OUT;
  return LIS_SUCCESS;
}

LIS_INT lis_input_mm_csr(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x, FILE *file)
{
  char      buf[BUFSIZE];
  LIS_INT        nr,nc,nnz;
  LIS_INT        i,j,my_rank;
  LIS_INT        err;
  LIS_INT        mmtype,mode;
  LIS_INT        n,is,ie;
  LIS_INT        ridx,cidx;
  LIS_INT        *ptr, *index;
  LIS_INT        *work;
  LIS_INT        isb,isx,isbin;
  LIS_SCALAR    val;
  LIS_SCALAR    *value;
  LIS_MM_MATFMT  matfmt;

  LIS_DEBUG_FUNC_IN;

  #ifdef USE_MPI
    my_rank = A->my_rank;
  #else
    my_rank = 0;
  #endif
  
  /* check banner */
  err = lis_input_mm_banner(file,&mmtype);
  if( err ) return err;

  /* check size */    
  err = lis_input_mm_size(file,&nr,&nc,&nnz,&isb,&isx,&isbin);
  if( err ) return err;

  err = lis_matrix_set_size(A,0,nr);
  if( err ) return err;

#ifdef _LONGLONG
  if( my_rank==0 ) printf("matrix size = %lld x %lld (%lld nonzero entries)\n",nr,nc,nnz);
#else
  if( my_rank==0 ) printf("matrix size = %d x %d (%d nonzero entries)\n",nr,nc,nnz);
#endif

  n      = A->n;
  ptr    = NULL;
  index  = NULL;
  value  = NULL;
  work   = NULL;


  lis_matrix_get_range(A,&is,&ie);

  ptr   = (LIS_INT *)lis_malloc( (n+1)*sizeof(LIS_INT),"lis_input_mm_csr::ptr" );
  if( ptr==NULL )
  {
    LIS_SETERR_MEM((n+1)*sizeof(LIS_INT));
    lis_free2(4,ptr,index,value,work);
    return LIS_OUT_OF_MEMORY;
  }
  work  = (LIS_INT *)lis_malloc( (n+1)*sizeof(LIS_INT),"lis_input_mm_csr::work" );
  if( work==NULL )
  {
    LIS_SETERR_MEM((n+1)*sizeof(LIS_INT));
    lis_free2(4,ptr,index,value,work);
    return LIS_OUT_OF_MEMORY;
  }

  #ifdef _OPENMP
  #pragma omp parallel for private(i)
  #endif
  for(i=0;i<n+1;i++)
  {
    ptr[i]  = 0;
    work[i]  = 0;
  }

  /* read data */
  mode = 1;
  mode = *(char *)&mode;
  if( mode!=(isbin-1) )
  {
    mode = LIS_TRUE;      
  }
  else
  {
    mode = LIS_FALSE;
  }
  for( i=0; i<nnz; i++ )
  {
    if( isbin )
    {
      if( fread(&matfmt, sizeof(matfmt), 1, file)!=1 )
      {
        LIS_SETERR_FIO;
        lis_free2(4,ptr,index,value,work);
        return LIS_ERR_FILE_IO;
      }
      ridx = matfmt.i;
      cidx = matfmt.j;
      if( mode )
      {
        lis_bswap_int(1,&ridx);
        lis_bswap_int(1,&cidx);
      }
    }
    else
    {
      if( fgets(buf, BUFSIZE, file)==NULL )
      {
        LIS_SETERR_FIO;
        lis_free2(4,ptr,index,value,work);
        return LIS_ERR_FILE_IO;
      }
#ifdef _LONGLONG
#ifdef _LONG__DOUBLE
      if( sscanf(buf, "%lld %lld %Lg", &ridx, &cidx, &val) != 3 )
#else
      if( sscanf(buf, "%lld %lld %lg", &ridx, &cidx, &val) != 3 )
#endif
#else
#ifdef _LONG__DOUBLE
      if( sscanf(buf, "%d %d %Lg", &ridx, &cidx, &val) != 3 )
#else
      if( sscanf(buf, "%d %d %lg", &ridx, &cidx, &val) != 3 )
#endif
#endif
      {
        LIS_SETERR_FIO;
        lis_free2(4,ptr,index,value,work);
        return LIS_ERR_FILE_IO;
      }
    }
/*    if( val!=0.0 )*/
    {
      if( mmtype==MM_SYMM && ridx!=cidx )
      {
        if( cidx>is && cidx<=ie ) work[cidx-is-1]++;
      }
      if( ridx>is && ridx<=ie )
      {
        ptr[ridx-is]++;
      }
    }
  }


  ptr[0] = 0;
  for( i=0; i<n; i++ )
  {
    if( mmtype==MM_SYMM )
    {
      ptr[i+1] += ptr[i] + work[i];
    }
    else
    {
      ptr[i+1] += ptr[i];
    }
    work[i] = 0;
  }

  index   = (LIS_INT *)lis_malloc( ptr[n]*sizeof(LIS_INT),"lis_input_mm_csr::index" );
  if( index==NULL )
  {
    LIS_SETERR_MEM(ptr[n]*sizeof(LIS_INT));
    lis_free2(4,ptr,index,value,work);
    return LIS_OUT_OF_MEMORY;
  }
  value   = (LIS_SCALAR *)lis_malloc( ptr[n]*sizeof(LIS_SCALAR),"lis_input_mm_csr::value" );
  if( value==NULL )
  {
    LIS_SETERR_MEM(ptr[n]*sizeof(LIS_SCALAR));
    lis_free2(4,ptr,index,value,work);
    return LIS_OUT_OF_MEMORY;
  }
  #ifdef _OPENMP
  #pragma omp parallel for private(i,j)
  #endif
  for(i=0;i<n;i++)
  {
    for(j=ptr[i];j<ptr[i+1];j++)
    {
      index[j] = 0;
      value[j] = 0.0;
    }
  }

  rewind(file);
  if( fgets(buf, BUFSIZE, file) == NULL )
  {
    LIS_SETERR_FIO;
    lis_free2(4,ptr,index,value,work);
    return LIS_ERR_FILE_IO;
  }
  do
  {
    if( fgets(buf, BUFSIZE, file) == NULL )
    {
      LIS_SETERR_FIO;
      lis_free2(4,ptr,index,value,work);
      return LIS_ERR_FILE_IO;
    }
  }while( buf[0]=='%' );

  for( i=0; i<nnz; i++ )
  {
    if( isbin )
    {
      if( fread(&matfmt, sizeof(matfmt), 1, file)!=1 )
      {
        LIS_SETERR_FIO;
        lis_free2(4,ptr,index,value,work);
        return LIS_ERR_FILE_IO;
      }
      ridx = matfmt.i;
      cidx = matfmt.j;
      val  = matfmt.value;
      if( mode )
      {
        lis_bswap_int(1,&ridx);
        lis_bswap_int(1,&cidx);
        lis_bswap_scalar(1,&val);
      }
    }
    else
    {
      if( fgets(buf, BUFSIZE, file) == NULL )
      {
        LIS_SETERR_FIO;
        lis_free2(4,ptr,index,value,work);
        return LIS_ERR_FILE_IO;
      }
#ifdef _LONGLONG
#ifdef _LONG__DOUBLE
      if( sscanf(buf, "%lld %lld %Lg", &ridx, &cidx, &val) != 3 )
#else
      if( sscanf(buf, "%lld %lld %lg", &ridx, &cidx, &val) != 3 )
#endif
#else
#ifdef _LONG__DOUBLE
      if( sscanf(buf, "%d %d %Lg", &ridx, &cidx, &val) != 3 )
#else
      if( sscanf(buf, "%d %d %lg", &ridx, &cidx, &val) != 3 )
#endif
#endif
      {
        LIS_SETERR_FIO;
        lis_free2(4,ptr,index,value,work);
        return LIS_ERR_FILE_IO;
      }
    }
    ridx--;
    cidx--;
    if( ridx==cidx && val==0.0 )
    {
#ifdef _LONGLONG
      printf("diagonal element is zero (i=%lld)\n",ridx);
#else
      printf("diagonal element is zero (i=%d)\n",ridx);
#endif
    }
/*    if( val!=0.0 )*/
    {
      if( mmtype==MM_SYMM && ridx!=cidx )
      {
        if( cidx>=is && cidx<ie )
        {
          value[ptr[cidx-is]+work[cidx-is]] = val;
          index[ptr[cidx-is]+work[cidx-is]] = ridx;
          work[cidx-is]++;
        }
      }
      if( ridx>=is && ridx<ie )
      {
        value[ptr[ridx-is]+work[ridx-is]] = val;
        index[ptr[ridx-is]+work[ridx-is]] = cidx;
        work[ridx-is]++;
      }
    }
  }
  #ifdef USE_MPI
    MPI_Barrier(A->comm);
  #endif

  err = lis_matrix_set_csr(ptr[n],ptr,index,value,A);
  if( err )
  {
    lis_free2(4,ptr,index,value,work);
    return err;
  }
  err = lis_matrix_assemble(A);
  if( err )
  {
    lis_matrix_storage_destroy(A);
    lis_free(work);
    return err;
  }

  if( b!=NULL && x!=NULL )
  {
    err = lis_input_mm_vec(A,b,x,file,isb,isx,isbin);
    if( err )
    {
      lis_matrix_storage_destroy(A);
      lis_free(work);
    }
  }
  lis_free(work);

  LIS_DEBUG_FUNC_OUT;
  return LIS_SUCCESS;
}
