/******************************************************************************
* Bzr-Read.c - Bezier handling routines - read from file.		      *
*******************************************************************************
* Written by Gershon Elber, Mar. 90.					      *
******************************************************************************/

#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "cagd_loc.h"

/******************************************************************************
* Reads and returns bezier curve(s) list.				      *
* If error is found in reading the file, ErrStr is set to string describing   *
* it and Line to the line it occured in file.				      *
* If no error is detected *ErrStr = NULL.				      *
******************************************************************************/
CagdCrvStruct *BzrCrvReadFromFile(char *FileName, char **ErrStr, int *ErrLine)
{
    FILE *f;
    char StringToken[LINE_LEN];
    CagdCrvStruct *Crv,
	*CrvTail = NULL,
	*CrvList = NULL;

    if ((f = fopen(FileName, "r")) == NULL) {
	*ErrStr = "File not found";
	*ErrLine = 0;
	return NULL;
    }

    while (_CagdGetToken(f, StringToken) == TOKEN_OPEN_PAREN) {
	_CagdUnGetToken(StringToken);
        Crv = BzrCrvReadFromFile2(f, FALSE, ErrStr, ErrLine);

	if (CrvList == NULL)
	    CrvList = CrvTail = Crv;
	else {
	    CrvTail -> Pnext = Crv;
	    CrvTail = Crv;
	}
    }

    fclose(f);

    return CrvList;
}

/******************************************************************************
* Reads and returns a bezier curve.					      *
* If NameWasRead is TRUE, it is assumed prefix "[CURVE BEZIER" has already    *
* been read. This is useful for a global parser which invokes this routine.   *
* For exactly this reason, the file is NOT closed in the end.		      *
* If error is found in reading the file, ErrStr is set to string describing   *
* it and ErrLine to line it occured in file relative to begining of curve.    *
* If no error is detected *ErrStr is set to NULL.			      *
******************************************************************************/
CagdCrvStruct *BzrCrvReadFromFile2(FILE *f, CagdBType NameWasRead,
						char **ErrStr, int *ErrLine)
{
    CagdPointType PType;
    TokenNumType Token;
    int i, j, Length, MaxCoord;
    char StringToken[LINE_LEN];
    CagdCrvStruct *NewCrv;

    _CagdGlblLineCount = *ErrLine;

    if (!NameWasRead) {
	while ((Token = _CagdGetToken(f, StringToken)) != TOKEN_EOF &&
	       Token != TOKEN_OPEN_PAREN);

	/* We found beginning of definition - read one: */
	if (_CagdGetToken(f, StringToken) != TOKEN_CURVE ||
	    _CagdGetToken(f, StringToken) != TOKEN_BEZIER) {
            *ErrStr = "CURVE BEZIER key words expected";
	    *ErrLine = _CagdGlblLineCount;
	    return NULL;
	}
    }

    if ((Token = _CagdGetToken(f, StringToken)) == TOKEN_OPEN_PAREN) {
	if ((*ErrStr = _CagdGetCurveAttributes(f)) != NULL) {
            *ErrStr = "\"[\" expected";
	    *ErrLine = _CagdGlblLineCount;
	    return NULL;
	}
    }
    else
	_CagdUnGetToken(StringToken);

    if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_OTHER ||
	sscanf(StringToken, "%d", &Length) != 1) {
	*ErrStr = "BEZIER Number of points expected";
	*ErrLine = _CagdGlblLineCount;
	return NULL;
    }

    if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_OTHER ||
	strlen(StringToken) != 2 ||
	(StringToken[0] != 'E' && StringToken[0] != 'P') ||
	!isdigit(StringToken[1]) ||
	atoi(&StringToken[1]) > CAGD_MAX_PT_COORD) {
	*ErrStr = "BEZIER Point type expected";
	*ErrLine = _CagdGlblLineCount;
	return NULL;
    }

    PType = CAGD_MAKE_PT_TYPE(StringToken[0] == 'P', atoi(&StringToken[1]));

    NewCrv = BzrCrvNew(Length, PType);

    /* Read the points themselves: */
    MaxCoord = CAGD_NUM_OF_PT_COORD(PType);
    for (i = 0; i < Length; i++) {
	if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_OPEN_PAREN) {
	    *ErrStr = "\"[\" expected";
	    *ErrLine = _CagdGlblLineCount;
	    CagdCrvFree(NewCrv);
	    return NULL;
	}
	if (CAGD_IS_RATIONAL_PT(PType)) {
	    if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_OTHER ||
		sscanf(StringToken, CAGD_FLOAT_READ,
						&NewCrv -> Points[W][i]) != 1) {
		*ErrStr = "Numeric data expected";
		*ErrLine = _CagdGlblLineCount;
		CagdCrvFree(NewCrv);
		return NULL;
	    }
	}
	for (j = 1; j <= MaxCoord; j++) {
	    if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_OTHER ||
		sscanf(StringToken, CAGD_FLOAT_READ,
						&NewCrv -> Points[j][i]) != 1) {
		*ErrStr = "Numeric data expected";
		*ErrLine = _CagdGlblLineCount;
		CagdCrvFree(NewCrv);
		return NULL;
	    }
	}
	if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_CLOSE_PAREN) {
	    *ErrStr = "\"]\" expected";
	    *ErrLine = _CagdGlblLineCount;
	    CagdCrvFree(NewCrv);
	    return NULL;
	}
    }
    if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_CLOSE_PAREN) {
	*ErrStr = "\"]\" expected";
	*ErrLine = _CagdGlblLineCount;
	CagdCrvFree(NewCrv);
	return NULL;
    }

    *ErrLine = _CagdGlblLineCount;
    *ErrStr = NULL;

    return NewCrv;
}

/******************************************************************************
* Reads and returns a bezier surface.					      *
* If error is found in reading the file, ErrStr is set to string describing   *
* it and ErrLine to the line it occured in file.			      *
* If no error is detected *ErrStr = NULL.				      *
******************************************************************************/
CagdSrfStruct *BzrSrfReadFromFile(char *FileName, char **ErrStr, int *ErrLine)
{
    FILE *f;
    char StringToken[LINE_LEN];
    CagdSrfStruct *Srf,
	*SrfTail = NULL,
	*SrfList = NULL;

    if ((f = fopen(FileName, "r")) == NULL) {
	*ErrStr = "File not found";
	return NULL;
    }

    while (_CagdGetToken(f, StringToken) == TOKEN_OPEN_PAREN) {
	_CagdUnGetToken(StringToken);
    	Srf = BzrSrfReadFromFile2(f, FALSE, ErrStr, ErrLine);

	if (SrfList == NULL)
	    SrfList = SrfTail = Srf;
	else {
	    SrfTail -> Pnext = Srf;
	    SrfTail = Srf;
	}
    }

    fclose(f);

    return SrfList;
}

/******************************************************************************
* Reads and returns a bezier surface.					      *
* If NameWasRead is TRUE, it is assumed prefix "[SURFACE BEZIER" has already  *
* been read. This is useful for a global parser which invokes this routine.   *
* For exactly this reason, the file is NOT closed in the end.		      *
* If error is found in reading the file, ErrStr is set to string describing   *
* it and ErrLine to the line it occured in file.		  	      *
* If no error is detected *ErrStr = NULL.				      *
******************************************************************************/
CagdSrfStruct *BzrSrfReadFromFile2(FILE *f, CagdBType NameWasRead,
						char **ErrStr, int *ErrLine)
{
    CagdPointType PType;
    TokenNumType Token;
    int i, j, ULength, VLength, MaxCoord;
    char StringToken[LINE_LEN];
    CagdSrfStruct *NewSrf;

    _CagdGlblLineCount = *ErrLine;

    if (!NameWasRead) {
	while ((Token = _CagdGetToken(f, StringToken)) != TOKEN_EOF &&
	       Token != TOKEN_OPEN_PAREN);

	/* We found beginning of definition - read one: */
	if (_CagdGetToken(f, StringToken) != TOKEN_SURFACE ||
	    _CagdGetToken(f, StringToken) != TOKEN_BEZIER) {
	    *ErrStr = "SURFACE BEZIER key words expected";
	    *ErrLine = _CagdGlblLineCount;
	    return NULL;
        }
    }

    if ((Token = _CagdGetToken(f, StringToken)) == TOKEN_OPEN_PAREN) {
	if ((*ErrStr = _CagdGetSurfaceAttributes(f)) != NULL) {
	    *ErrStr = "\"[\" expected";
	    *ErrLine = _CagdGlblLineCount;
	    return NULL;
	}
    }
    else
	_CagdUnGetToken(StringToken);

    if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_OTHER ||
        sscanf(StringToken, "%d", &ULength) != 1 ||
	(Token = _CagdGetToken(f, StringToken)) != TOKEN_OTHER ||
	sscanf(StringToken, "%d", &VLength) != 1) {
	*ErrStr = "BEZIER Number of points expected";
	*ErrLine = _CagdGlblLineCount;
	return NULL;
    }
    if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_OTHER ||
        strlen(StringToken) != 2 ||
	(StringToken[0] != 'E' && StringToken[0] != 'P') ||
	!isdigit(StringToken[1]) ||
	atoi(&StringToken[1]) > CAGD_MAX_PT_COORD) {
	*ErrStr = "BEZIER Point type expected";
	*ErrLine = _CagdGlblLineCount;
	return NULL;
    }
    PType = CAGD_MAKE_PT_TYPE(StringToken[0] == 'P', atoi(&StringToken[1]));

    NewSrf = BzrSrfNew(ULength, VLength, PType);

    /* Read the points themselves: */
    MaxCoord = CAGD_NUM_OF_PT_COORD(PType);
    for (i = 0; i < ULength * VLength; i++) {
	if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_OPEN_PAREN) {
	    *ErrStr = "\"[\" expected";
	    *ErrLine = _CagdGlblLineCount;
	    CagdSrfFree(NewSrf);
	    return NULL;
	}
	if (CAGD_IS_RATIONAL_PT(PType)) {
	    if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_OTHER ||
	        sscanf(StringToken, CAGD_FLOAT_READ,
					&NewSrf -> Points[W][i]) != 1) {
		*ErrStr = "Numeric data expected";
		*ErrLine = _CagdGlblLineCount;
		CagdSrfFree(NewSrf);
		return NULL;
	    }
	}
	for (j = 1; j <= MaxCoord; j++) {
	    if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_OTHER ||
	        sscanf(StringToken, CAGD_FLOAT_READ,
						&NewSrf -> Points[j][i]) != 1) {
		*ErrStr = "Numeric data expected";
		*ErrLine = _CagdGlblLineCount;
		CagdSrfFree(NewSrf);
		return NULL;
	    }
	}
	if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_CLOSE_PAREN) {
	    *ErrStr = "\"]\" expected";
	    *ErrLine = _CagdGlblLineCount;
	    CagdSrfFree(NewSrf);
	    return NULL;
	}
    }
    if ((Token = _CagdGetToken(f, StringToken)) != TOKEN_CLOSE_PAREN) {
        *ErrStr = "\"]\" expected";
	*ErrLine = _CagdGlblLineCount;
	CagdSrfFree(NewSrf);
	return NULL;
    }

    *ErrStr = NULL;
    *ErrLine = _CagdGlblLineCount;

    return NewSrf;
}