/* Vis5D version 5.0 */

/*
   Vis5D system for visualizing five dimensional gridded data sets
   Copyright (C) 1990 - 1996 Bill Hibbard, Brian Paul, Dave Santek,
   and Andre Battaiola.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 1, 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef V5D_H
#define V5D_H

#include <sys/types.h>

/*
 * A numeric version number which we can test for in utility programs which
 * use the v5d functions.  For example, we can do tests like this:
 * #if V5D_VERSION > 42
 *      do something
 * #else
 *      do something else
 * #endif
 *
 * If V5D_VERSION is not defined, then its value is considered to be zero.
 */

#define V5D_VERSION 42

/*
 * Define our own 1 and 2-byte data types.  We use these names to avoid
 * collisions with types defined by the OS include files.
 */
typedef unsigned char V5Dubyte;   /* Must be 1 byte */
typedef unsigned short V5Dushort; /* Must be 2 byte */

#define MISSING       1.0e35
#define IS_MISSING(X) ((X) >= 1.0e30)

/* Limits on 5-D grid size:  (must match those in v5df.h!!!) */
#define MAXVARS       30
#define MAXTIMES      400
#define MAXROWS       400
#define MAXCOLUMNS    400
#define MAXLEVELS     100

/************************************************************************/

/***                                                                  ***/

/*** Functions for writing v5d files.  See README file for details.   ***/

/*** These are the functions user's will want for writing file        ***/

/*** converters, etc.                                                 ***/

/***                                                                  ***/

/************************************************************************/

extern int v5dCreateSimple(const char *name, int numtimes, int numvars, int nr,
                           int nc, int nl, const char varname[MAXVARS][10],
                           const int timestamp[], const int datestamp[],
                           float northlat, float latinc, float westlon,
                           float loninc, float bottomhgt, float hgtinc);

extern int v5dCreate(const char *name, int numtimes, int numvars, int nr,
                     int nc, const int nl[], const char varname[MAXVARS][10],
                     const int timestamp[], const int datestamp[],
                     int compressmode, int projection, const float proj_args[],
                     int vertical, const float vert_args[]);

extern int v5dWrite(int time, int var, const float data[]);

extern int v5dClose(void);

extern int v5dSetLowLev(int lowlev[]);

extern int v5dSetUnits(int var, const char *units);

/************************************************************************/

/***                                                                  ***/

/*** Definition of v5d struct and function prototypes.                ***/

/*** These functions are used by vis5d and advanced v5d utilities.    ***/

/***                                                                  ***/

/************************************************************************/

#define MAXPROJARGS 100
#define MAXVERTARGS (MAXLEVELS + 1)

/*
 * This struct describes the structure of a .v5d file.
 */
typedef struct {
    /* PUBLIC (user can freely read, sometimes write, these fields) */
    int NumTimes;              /* Number of time steps */
    int NumVars;               /* Number of variables */
    int Nr;                    /* Number of rows */
    int Nc;                    /* Number of columns */
    int Nl[MAXVARS];           /* Number of levels per variable */
    int LowLev[MAXVARS];       /* Lowest level per variable */
    char VarName[MAXVARS][10]; /* 9-character variable names */
    char Units[MAXVARS][20];   /* 19-character units for variables */
    int TimeStamp[MAXTIMES];   /* Time in HHMMSS format */
    int DateStamp[MAXTIMES];   /* Date in YYDDD format */
    float MinVal[MAXVARS];     /* Minimum variable data values */
    float MaxVal[MAXVARS];     /* Maximum variable data values */

    /* This info is used for external function computation */
    short McFile[MAXTIMES][MAXVARS]; /* McIDAS file number in 1..9999 */
    short McGrid[MAXTIMES][MAXVARS]; /* McIDAS grid number in 1..? */

    int VerticalSystem;          /* Which vertical coordinate system */
    float VertArgs[MAXVERTARGS]; /* Vert. Coord. Sys. arguments... */

    /*
       IF VerticalSystem==0 THEN
       -- Linear scale, equally-spaced levels in generic units
       VertArgs[0] = Height of bottom-most grid level in generic units
       VertArgs[1] = Increment between levels in generic units
       ELSE IF VerticalSystem==1 THEN
       -- Linear scale, equally-spaced levels in km
       VertArgs[0] = Height of bottom grid level in km
       VertArgs[1] = Increment between levels in km
       ELSE IF VerticalSystem==2 THEN
       -- Linear scale, Unequally spaced levels in km
       VertArgs[0] = Height of grid level 0 (bottom) in km
       ...                ...
       VertArgs[n] = Height of grid level n in km
       ELSE IF VerticalSystem==3 THEN
       -- Linear scale, Unequally spaced levels in mb
       VertArgs[0] = Pressure of grid level 0 (bottom) in mb
       ...             ...
       VertArgs[n] = Pressure of grid level n in mb
       ENDIF
     */

    int Projection;              /* Which map projection */
    float ProjArgs[MAXPROJARGS]; /* Map projection arguments... */

    /*
       IF Projection==0 THEN
       -- Rectilinear grid, generic units
       ProjArgs[0] = North bound, Y coordinate of grid row 0
       ProjArgs[1] = West bound, X coordinate of grid column 0
       ProjArgs[2] = Increment between rows
       ProjArgs[3] = Increment between columns
       NOTES: X coordinates increase to the right, Y increase upward.
       NOTES: Coordinate system is right-handed.
       ELSE IF Projection==1 THEN
       -- Cylindrical equidistant (Old VIS-5D)
       -- Rectilinear grid in lat/lon
       ProjArgs[0] = Latitude of grid row 0, north bound, in degrees
       ProjArgs[1] = Longitude of grid column 0, west bound, in deg.
       ProjArgs[2] = Increment between rows in degrees
       ProjArgs[3] = Increment between rows in degrees
       NOTES: Coordinates (degrees) increase to the left and upward.
       ELSE IF Projection==2 THEN
       -- Lambert conformal
       ProjArgs[0] = Standared Latitude 1 of conic projection
       ProjArgs[1] = Standared Latitude 2 of conic projection
       ProjArgs[2] = Row of North/South pole
       ProjArgs[3] = Column of North/South pole
       ProjArgs[4] = Longitude which is parallel to columns
       ProjArgs[5] = Increment between grid columns in km
       ELSE IF Projection==3 THEN
       -- Polar Stereographic
       ProjArgs[0] = Latitude of center of projection
       ProjArgs[1] = Longitude of center of projection
       ProjArgs[2] = Grid row of center of projection
       ProjArgs[3] = Grid column of center of projection
       ProjArgs[4] = Increment between grid columns at center in km
       ELSE IF Projection==4 THEN
       -- Rotated
       ProjArgs[0] = Latitude on rotated globe of grid row 0
       ProjArgs[1] = Longitude on rotated globe of grid column 0
       ProjArgs[2] = Degrees of latitude on rotated globe between
       grid rows
       ProjArgs[3] = Degrees of longitude on rotated globe between
       grid columns
       ProjArgs[4] = Earth latitude of (0, 0) on rotated globe
       ProjArgs[5] = Earth longitude of (0, 0) on rotated globe
       ProjArgs[6] = Clockwise rotation of rotated globe in degrees
       ENDIF
     */

    int CompressMode;     /* 1, 2 or 4 = # bytes per grid point */
    char FileVersion[10]; /* 9-character version number */

    /* PRIVATE (not to be touched by user code) */
    unsigned int FileFormat; /* COMP5D file version or 0 if .v5d */
    int FileDesc;            /* Unix file descriptor */
    char Mode;               /* 'r' = read, 'w' = write */
    off_t CurPos;            /* current position of file pointer */
    off_t FirstGridPos;      /* position of first grid in file */
    off_t GridSize[MAXVARS]; /* size of each grid */
    off_t SumGridSizes;      /* sum of GridSize[0..NumVars-1] */
} v5dstruct;

extern float pressure_to_height(float pressure);

extern float height_to_pressure(float height);

extern int v5dYYDDDtoDays(int yyddd);

extern int v5dHHMMSStoSeconds(int hhmmss);

extern int v5dDaysToYYDDD(int days);

extern int v5dSecondsToHHMMSS(int seconds);

extern void v5dPrintStruct(const v5dstruct *v);

extern v5dstruct *v5dNewStruct(void);

extern void v5dFreeStruct(v5dstruct *v);

extern void v5dInitStruct(v5dstruct *v);

extern int v5dVerifyStruct(const v5dstruct *v);

extern void v5dCompressGrid(int nr, int nc, int nl, int compressmode,
                            const float data[], void *compdata, float ga[],
                            float gb[], float *minval, float *maxval);

extern void v5dDecompressGrid(int nr, int nc, int nl, int compressmode,
                              void *compdata, float ga[], float gb[],
                              float data[]);

extern int v5dSizeofGrid(const v5dstruct *v, int time, int var);

extern v5dstruct *v5dOpenFile(const char *filename, v5dstruct *v);

extern int v5dCreateFile(const char *filename, v5dstruct *v);

extern v5dstruct *v5dUpdateFile(const char *filename, v5dstruct *v);

extern int v5dCloseFile(v5dstruct *v);

extern int v5dReadCompressedGrid(v5dstruct *v, int time, int var, float *ga,
                                 float *gb, void *compdata);

extern int v5dReadGrid(v5dstruct *v, int time, int var, float data[]);

extern int v5dWriteCompressedGrid(const v5dstruct *v, int time, int var,
                                  const float *ga, const float *gb,
                                  const void *compdata);

extern int v5dWriteGrid(v5dstruct *v, int time, int var, const float data[]);

#endif
