/****p* Program/H5match_types
 *
 * NAME
 *  Executable: H5match_types
 *
 * FILE
 *  fortran/src/H5match_types.c
 *
 * PURPOSE
 *  C Program to match C types to Fortran types.
 *  Creates the files H5f90i_gen.h for the C code and
 *  H5fortran_types.F90 for the Fortran code.
 *
 * COPYRIGHT
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *
 ******
*/

#include <stdio.h>
#include <string.h>
#include <assert.h>

#include "H5public.h"
/* Include H5Ipublic.h for hid_t type */
#include "H5Ipublic.h"

/* Definitions of which fortran type sizes exist */
#include "H5fort_type_defines.h"

/* File pointers for files */
FILE * c_header;
FILE * fort_header;

#define CFILE "H5f90i_gen.h"
#define FFILE "H5fortran_types.F90"

/* Prototypes for the write routines */
void writeTypedef(const char* c_typedef, const char* c_type, int size);
void writeTypedefDefault(const char* c_typedef, int size);
void writeToFiles(const char* c_typedef, const char* fortran_type, const char* c_type, int kind);
void writeToCFileOnly(const char* c_typedef, const char* fortran_type, const char* c_type, int size);
void writeToFilesChr(const char* c_typedef, const char* fortran_type, const char* c_type, int size, const char* kind);

static void
initCfile(void)
{
  fprintf(c_header,
 "/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\n\
 * Copyright by The HDF Group.                                               *\n\
 * Copyright by the Board of Trustees of the University of Illinois.         *\n\
 * All rights reserved.                                                      *\n\
 *                                                                           *\n\
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *\n\
 * terms governing use, modification, and redistribution, is contained in    *\n\
 * the COPYING file, which can be found at the root of the source code       *\n\
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *\n\
 * If you do not have access to either file, you may request a copy from     *\n\
 * help@hdfgroup.org.                                                        *\n\
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */\n\
\n\n\
#ifndef _H5f90i_gen_H\n\
#define _H5f90i_gen_H\n\
\n\
/* This file is automatically generated by H5match_types.c at build time. */\n\
\n\
#include \"H5public.h\"\n\n");
}

static void
initFfile(void)
{
  fprintf(fort_header,
    "! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * \n\
!   Copyright by The HDF Group.                                               *\n\
!   Copyright by the Board of Trustees of the University of Illinois.         *\n\
!   All rights reserved.                                                      *\n\
!                                                                             *\n\
!   This file is part of HDF5.  The full HDF5 copyright notice, including     *\n\
!   terms governing use, modification, and redistribution, is contained in    *\n\
!   the COPYING file, which can be found at the root of the source code       *\n\
!   distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *\n\
!   If you do not have access to either file, you may request a copy from     *\n\
!   help@hdfgroup.org.                                                        *\n\
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\n\
!\n!\n\
! This file is automatically generated by H5match_types.c and contains HDF5 Fortran90 type definitions.\n!\n\
       MODULE H5FORTRAN_TYPES\n\
         USE ISO_C_BINDING\n\
         !\n\
         !  HDF5 integers\n\
         !\n");

}

static void
endCfile(void)
{
  fprintf(c_header, "\n#endif /* _H5f90i_gen_H */\n");
}
static void
endFfile(void)
{
  fprintf(fort_header, "\n        INTEGER(SIZE_T), PARAMETER :: OBJECT_NAMELEN_DEFAULT_F = -1\n\n");
  fprintf(fort_header, "        END MODULE H5FORTRAN_TYPES\n");
}

/* Define a c_int_x type in the C header */
void writeTypedef(const char* c_typedef, const char* c_type, int size)
{
  fprintf(c_header, "#define c_%s_%u %s\n", c_typedef, size, c_type);
}

/* Call this function if there is no matching C type for sizes > 1 */
void writeTypedefDefault(const char* c_typedef, int size)
{
  assert(size %2 == 0);
  fprintf(c_header, "typedef struct {c_%s_%u a; c_%s_%u b;} c_%s_%u;\n", c_typedef, size / 2, c_typedef, size / 2, c_typedef, size);
}

/* Create matching Fortran and C types by writing to both files */
void writeToFiles(const char* c_typedef, const char* fortran_type, const char* c_type, int kind)
{
  fprintf(fort_header, "        INTEGER, PARAMETER :: %s = %u\n", fortran_type, kind);
  fprintf(c_header, "typedef c_%s_%d %s;\n", c_typedef, kind, c_type);
}
void writeToFilesChr(const char* c_typedef, const char* fortran_type, const char* c_type, int size, const char* kind)
{
  fprintf(fort_header, "        INTEGER, PARAMETER :: %s = %s\n", fortran_type, kind);
  fprintf(c_header, "typedef c_%s_%d %s;\n", c_typedef, size, c_type);
}
int main(void)
{
  int i;
  char chrA[64],chrB[64];

  int IntKinds[] = H5_FORTRAN_INTEGER_KINDS;
  int IntKinds_SizeOf[] = H5_FORTRAN_INTEGER_KINDS_SIZEOF;
  int RealKinds[] = H5_FORTRAN_REAL_KINDS;
  int RealKinds_SizeOf[] = H5_FORTRAN_REAL_KINDS_SIZEOF;
  char Real_C_TYPES[10][32];
  
  int FORTRAN_NUM_INTEGER_KINDS=H5_FORTRAN_NUM_INTEGER_KINDS;
  int H5_FORTRAN_NUM_REAL_KINDS;
  int found_long_double = 0;

  /* Open target files */
  c_header = fopen(CFILE, "w");
  fort_header = fopen(FFILE, "w");

  /* Write copyright, boilerplate to both files */
  initCfile();
  initFfile();

  /* (a) define c_int_x */

  FORTRAN_NUM_INTEGER_KINDS = (int)(sizeof(IntKinds)/sizeof(IntKinds[0]));
  H5_FORTRAN_NUM_REAL_KINDS = (int)(sizeof(RealKinds)/sizeof(RealKinds[0]));

  fprintf(fort_header,"        INTEGER, PARAMETER :: H5_FORTRAN_NUM_INTEGER_KINDS = %d\n", FORTRAN_NUM_INTEGER_KINDS);


  for(i=0;i< FORTRAN_NUM_INTEGER_KINDS;i++) {
    if(sizeof(long long) == IntKinds_SizeOf[i])
      writeTypedef("int", "long long", IntKinds[i]);
    else if(sizeof(long) == IntKinds[i])
      writeTypedef("int", "long", IntKinds[i]);
    else if(sizeof(int) == IntKinds_SizeOf[i])
      writeTypedef("int", "int", IntKinds[i]);
    else if(sizeof(short) == IntKinds_SizeOf[i])
      writeTypedef("int", "short", IntKinds[i]);
    else
      if(IntKinds_SizeOf[i] == 1) {
	writeTypedef("int", "char", IntKinds[i]);
	/* Actually, char is not necessarily one byte.
	 * But if char isn't, then nothing is, so this
	 * is as close as we can get. */
      } else {
	writeTypedefDefault("int",IntKinds[i]);
      }
    if(sizeof(size_t) == IntKinds_SizeOf[i])
      writeTypedef("size_t", "size_t", IntKinds[i]);
    if(sizeof(time_t) == IntKinds_SizeOf[i])
      writeTypedef("time_t", "time_t", IntKinds[i]);
    if(sizeof(hsize_t) == IntKinds_SizeOf[i])
      writeTypedef("hsize_t", "hsize_t", IntKinds[i]);
  }

  /* (b) Define c_float_x */

  for(i=0;i< H5_FORTRAN_NUM_REAL_KINDS;i++) {
    if (sizeof(float) == RealKinds_SizeOf[i]) {
      writeTypedef("float", "float", RealKinds[i]);
      strcpy(Real_C_TYPES[i], "C_FLOAT");
    }
    else if(sizeof(double) == RealKinds_SizeOf[i]) {
      writeTypedef("float", "double", RealKinds[i]);
      strcpy(Real_C_TYPES[i], "C_DOUBLE"); 
    }
#if H5_FORTRAN_HAVE_C_LONG_DOUBLE!=0
    else if(sizeof(long double) == RealKinds_SizeOf[i] && found_long_double == 0) {
      writeTypedef("float", "long double", RealKinds[i]);
      strcpy(Real_C_TYPES[i], "C_LONG_DOUBLE");
      found_long_double = 1; 
    }
#  ifdef H5_HAVE_FLOAT128
    /* Don't select a higher precision than Fortran can support */
    else if(sizeof(__float128) == RealKinds_SizeOf[i] && found_long_double == 1 && H5_PAC_FC_MAX_REAL_PRECISION > 28) {
      writeTypedef("float", "__float128", RealKinds[i]);
      strcpy(Real_C_TYPES[i], "C_FLOAT128");
    }
#  else
    else if(sizeof(long double) == RealKinds_SizeOf[i] && found_long_double == 1 && H5_PAC_FC_MAX_REAL_PRECISION > 28) {
      writeTypedef("float", "long double", RealKinds[i]);
      strcpy(Real_C_TYPES[i], "C_FLOAT128");
    }
#  endif
#else /* There is no C_LONG_DOUBLE intrinsic */
#  ifdef H5_HAVE_FLOAT128
    /* Don't select a higher precision than Fortran can support */
    else if(sizeof(__float128) == RealKinds_SizeOf[i] ) {
      writeTypedef("float", "__float128", RealKinds[i]);
      strcpy(Real_C_TYPES[i], "C_FLOAT128");
    }
#  else
    else if(sizeof(long double) == RealKinds_SizeOf[i] ) {
      writeTypedef("float", "long double", RealKinds[i]);
      strcpy(Real_C_TYPES[i], "C_FLOAT128");
    }
#  endif
#endif
    else {
      printf("\n                      **** HDF5 WARNING ****\n");
      printf("Fortran REAL(KIND=%d) is %d Bytes, but no corresponding C float type exists of that size\n",RealKinds[i],RealKinds_SizeOf[i]);
      printf("     !!! Fortran interfaces will not be generated for REAL(KIND=%d) !!!\n\n",RealKinds[i]);

      RealKinds_SizeOf[i] = -1;
      RealKinds[i] = -1;
    }
  }

  /* Now begin defining fortran types. */
  fprintf(c_header, "\n");

  /* haddr_t */
  for(i=0;i< FORTRAN_NUM_INTEGER_KINDS;i++) {
    if(IntKinds_SizeOf[i] == H5_SIZEOF_HADDR_T) {
      writeToFiles("int","HADDR_T", "haddr_t_f", IntKinds[i]);
      break;
    }
    if(i == (FORTRAN_NUM_INTEGER_KINDS-1) )
      /* Error: couldn't find a size for haddr_t */
      return -1;
  }

  /* hsize_t */
  for(i=0;i< FORTRAN_NUM_INTEGER_KINDS;i++) {
    if(IntKinds_SizeOf[i] == H5_SIZEOF_HSIZE_T) {
      writeToFiles("hsize_t","HSIZE_T", "hsize_t_f", IntKinds[i]);
      break;
    }
    if(i == (FORTRAN_NUM_INTEGER_KINDS-1) )
      /* Error: couldn't find a size for hsize_t */
      return -1;
  }

  /* hssize_t */
  for(i=0;i< FORTRAN_NUM_INTEGER_KINDS;i++) {
    if(IntKinds_SizeOf[i] == H5_SIZEOF_HSSIZE_T) {
      writeToFiles("int","HSSIZE_T", "hssize_t_f", IntKinds[i]);
      break;
    }
    if(i == (FORTRAN_NUM_INTEGER_KINDS-1) )
      /* Error: couldn't find a size for hssize_t */
      return -1;
  }

  /* off_t */
  for(i=0;i< FORTRAN_NUM_INTEGER_KINDS;i++) {
    if(IntKinds_SizeOf[i] == H5_SIZEOF_OFF_T) {
      writeToFiles("int","OFF_T", "off_t_f", IntKinds[i]);
      break;
    }
    if(i == (FORTRAN_NUM_INTEGER_KINDS-1) )
      /* Error: couldn't find a size for off_t */
      return -1;
  }

  /* size_t */
  for(i=0;i< FORTRAN_NUM_INTEGER_KINDS;i++) {
    if(IntKinds_SizeOf[i] == H5_SIZEOF_SIZE_T) {
      writeToFiles("size_t","SIZE_T", "size_t_f", IntKinds[i]);
      break;
    }
    if(i == (FORTRAN_NUM_INTEGER_KINDS-1) )
      /* Error: couldn't find a size for size_t */
      return -1;
  }

  /* time_t */
  for(i=0;i< FORTRAN_NUM_INTEGER_KINDS;i++) {
    if(IntKinds_SizeOf[i] == H5_SIZEOF_TIME_T) {
      writeToFiles("time_t","TIME_T", "time_t_f", IntKinds[i]);
      break;
    }
    if(i == (FORTRAN_NUM_INTEGER_KINDS-1) )
      /* Error: couldn't find a size for time_t */
      return -1;
  }

  /* int */
  writeToFiles("int","Fortran_INTEGER", "int_f", H5_FORTRAN_NATIVE_INTEGER_KIND);

  /* int_1, int_2, int_4, int_8 */

/* Defined different KINDs of integers */

  fprintf(fort_header,"        INTEGER, DIMENSION(1:%d), PARAMETER :: Fortran_INTEGER_AVAIL_KINDS = (/", FORTRAN_NUM_INTEGER_KINDS);
  
  for(i=0;i<FORTRAN_NUM_INTEGER_KINDS;i++) {
    fprintf(fort_header,"%d",(int)IntKinds[i]);
    if(i==FORTRAN_NUM_INTEGER_KINDS-1) {
      fprintf(fort_header,"/)\n");
    } else {
      fprintf(fort_header,",");
    }
    
  }

  /* real_4, real_8, real_16 */

/* Defined different KINDs of reals:                          */
/* if the REAL kind is not available then we assign           */
/* it a value of the next larger one, but if the next         */
/* higher one is not available we assigned it the next lowest */

  for(i=0;i<H5_FORTRAN_NUM_REAL_KINDS;i++) {
    if (RealKinds[i] > 0) {
      snprintf(chrA, sizeof(chrA), "Fortran_REAL_%s", Real_C_TYPES[i]);
      snprintf(chrB, sizeof(chrB), "real_%s_f", Real_C_TYPES[i]);
      writeToFiles("float",chrA, chrB, RealKinds[i]);
    }
  }

  /* hid_t */
  for(i=0;i< FORTRAN_NUM_INTEGER_KINDS;i++) {
    if(IntKinds_SizeOf[i] == H5_SIZEOF_HID_T) {
      writeToFiles("int","HID_T", "hid_t_f", IntKinds[i]);
      break;
    }
    if(i == (FORTRAN_NUM_INTEGER_KINDS-1) )
      /* Error: couldn't find a size for hid_t */
      return -1;
  }
  /* real_f */
#if H5_FORTRAN_HAVE_C_LONG_DOUBLE!=0
  if(H5_FORTRAN_NATIVE_REAL_SIZEOF == sizeof(long double)) {
    writeToFilesChr("float","Fortran_REAL", "real_f", H5_FORTRAN_NATIVE_REAL_KIND, "C_LONG_DOUBLE");
  } else
#endif
  if(H5_FORTRAN_NATIVE_REAL_SIZEOF == sizeof(double)) {
    writeToFilesChr("float","Fortran_REAL", "real_f", H5_FORTRAN_NATIVE_REAL_KIND, "C_DOUBLE");
  } else if(H5_FORTRAN_NATIVE_REAL_SIZEOF == sizeof(float))
    writeToFilesChr("float","Fortran_REAL", "real_f", H5_FORTRAN_NATIVE_REAL_KIND, "C_FLOAT");
  else {
    /* No exact match, choose the next highest */
    if(H5_FORTRAN_NATIVE_REAL_SIZEOF > sizeof(long double))
      writeToFilesChr("float","Fortran_REAL", "real_f", H5_FORTRAN_NATIVE_REAL_KIND, "C_LONG_DOUBLE");
    else if(H5_FORTRAN_NATIVE_REAL_SIZEOF > sizeof(double))
      writeToFilesChr("float","Fortran_REAL", "real_f", H5_FORTRAN_NATIVE_REAL_KIND, "C_DOUBLE");
    else if(H5_FORTRAN_NATIVE_REAL_SIZEOF > sizeof(float))
      writeToFilesChr("float","Fortran_REAL", "real_f", H5_FORTRAN_NATIVE_REAL_KIND, "C_FLOAT");
    else {
      /* Error: couldn't find a size for real_f */
      printf("Error: couldn't find a size for real_f \n");
      return -1;
    }
  }

  /* double_f */
#if H5_FORTRAN_HAVE_C_LONG_DOUBLE!=0
  if(H5_FORTRAN_NATIVE_DOUBLE_SIZEOF == sizeof(long double)){
    writeToFilesChr("float","Fortran_DOUBLE", "double_f", H5_FORTRAN_NATIVE_DOUBLE_KIND, "C_LONG_DOUBLE");
  } else
#endif
  if(H5_FORTRAN_NATIVE_DOUBLE_SIZEOF == sizeof(double)) {
    writeToFilesChr("float","Fortran_DOUBLE", "double_f", H5_FORTRAN_NATIVE_DOUBLE_KIND, "C_DOUBLE");
  } else if(H5_FORTRAN_NATIVE_DOUBLE_SIZEOF == sizeof(float))
    writeToFilesChr("float","Fortran_DOUBLE", "double_f", H5_FORTRAN_NATIVE_DOUBLE_KIND, "C_FLOAT");
#ifdef H5_HAVE_FLOAT128
    /* Don't select a higher precision than Fortran can support */
  else if(sizeof(__float128) == H5_FORTRAN_NATIVE_DOUBLE_SIZEOF && H5_PAC_FC_MAX_REAL_PRECISION > 28) {
      writeToFilesChr("float","Fortran_DOUBLE", "double_f", H5_FORTRAN_NATIVE_DOUBLE_KIND, "Fortran_REAL_C_FLOAT128");
    }
#else
  else if(sizeof(long double) == H5_FORTRAN_NATIVE_DOUBLE_SIZEOF && H5_PAC_FC_MAX_REAL_PRECISION > 28) {
      writeToFilesChr("float","Fortran_DOUBLE", "double_f", H5_FORTRAN_NATIVE_DOUBLE_KIND, "Fortran_REAL_C_FLOAT128");
    }
#endif
  else {
    /* Error: couldn't find a size for double_f */
    printf("Error: couldn't find a size for double_f \n");
    return -1;
  }

  /* Need the buffer size for the fortran derive type 'hdset_reg_ref_t_f03'
   * in order to be interoperable with C's structure, the C buffer size
   * H5R_DSET_REG_REF_BUF_SIZE is (sizeof(haddr_t)+4)
   */
    
    fprintf(fort_header, "        INTEGER, PARAMETER :: H5R_DSET_REG_REF_BUF_SIZE_F = %u\n", H5_SIZEOF_HADDR_T + 4 );

  /* Close files */
  endCfile();
  endFfile();
  fclose(c_header);
  fclose(fort_header);

  return 0;
}

