/******************************************************************************
 * $Id: ogr_spatialref.h 10646 2007-01-18 02:38:10Z warmerdam $
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  Classes for manipulating spatial reference systems in a
 *           platform non-specific manner.
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * Copyright (c) 1999,  Les Technologies SoftMap Inc.
 *
 * 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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#ifndef _OGR_SPATIALREF_H_INCLUDED
#define _OGR_SPATIALREF_H_INCLUDED

#include "ogr_srs_api.h"

/**
 * \file ogr_spatialref.h
 *
 * Coordinate systems services.
 */

/************************************************************************/
/*                             OGR_SRSNode                              */
/************************************************************************/

/**
 * Objects of this class are used to represent value nodes in the parsed
 * representation of the WKT SRS format.  For instance UNIT["METER",1]
 * would be rendered into three OGR_SRSNodes.  The root node would have a
 * value of UNIT, and two children, the first with a value of METER, and the
 * second with a value of 1.
 *
 * Normally application code just interacts with the OGRSpatialReference
 * object, which uses the OGR_SRSNode to implement it's data structure;
 * however, this class is user accessable for detailed access to components
 * of an SRS definition.
 */

class CPL_DLL OGR_SRSNode
{
    char        *pszValue;

    OGR_SRSNode **papoChildNodes;
    OGR_SRSNode *poParent;

    int         nChildren;

    void        ClearChildren();
    int         NeedsQuoting() const;
    
  public:
                OGR_SRSNode(const char * = NULL);
                ~OGR_SRSNode();

    int         IsLeafNode() const { return nChildren == 0; }
    
    int         GetChildCount() const { return nChildren; }
    OGR_SRSNode *GetChild( int );
    const OGR_SRSNode *GetChild( int ) const;

    OGR_SRSNode *GetNode( const char * );
    const OGR_SRSNode *GetNode( const char * ) const;

    void        InsertChild( OGR_SRSNode *, int );
    void        AddChild( OGR_SRSNode * );
    int         FindChild( const char * ) const;
    void        DestroyChild( int );
    void        StripNodes( const char * );

    const char  *GetValue() const { return pszValue; }
    void        SetValue( const char * );

    void        MakeValueSafe();
    OGRErr      FixupOrdering();

    OGR_SRSNode *Clone() const;

    OGRErr      importFromWkt( char ** );
    OGRErr      exportToWkt( char ** ) const;
    OGRErr      exportToPrettyWkt( char **, int = 1) const;
    
    OGRErr      applyRemapper( const char *pszNode, 
                               char **papszSrcValues, 
                               char **papszDstValues, 
                               int nStepSize = 1,
                               int bChildOfHit = FALSE );
};

/************************************************************************/
/*                         OGRSpatialReference                          */
/************************************************************************/

/**
 * This class respresents a OpenGIS Spatial Reference System, and contains
 * methods for converting between this object organization and well known
 * text (WKT) format.  This object is reference counted as one instance of
 * the object is normally shared between many OGRGeometry objects.
 *
 * Normally application code can fetch needed parameter values for this
 * SRS using GetAttrValue(), but in special cases the underlying parse tree
 * (or OGR_SRSNode objects) can be accessed more directly.
 *
 * See <a href="osr_tutorial.html">the tutorial</a> for more information on
 * how to use this class.
 */

class CPL_DLL OGRSpatialReference
{
    double      dfFromGreenwich;
    double      dfToMeter;
    double      dfToDegrees;

    OGR_SRSNode *poRoot;

    int         nRefCount;
    int         bNormInfoSet;

    OGRErr      ValidateProjection();
    int         IsAliasFor( const char *, const char * );
    void        GetNormInfo() const;

  public:
                OGRSpatialReference(const OGRSpatialReference&);
                OGRSpatialReference(const char * = NULL);
                
    virtual    ~OGRSpatialReference();
                
    OGRSpatialReference &operator=(const OGRSpatialReference&);

    int         Reference();
    int         Dereference();
    int         GetReferenceCount() const { return nRefCount; }
    void        Release();

    OGRSpatialReference *Clone() const;
    OGRSpatialReference *CloneGeogCS() const;

    OGRErr      exportToWkt( char ** ) const;
    OGRErr      exportToPrettyWkt( char **, int = FALSE) const;
    OGRErr      exportToProj4( char ** ) const;
    OGRErr      exportToPCI( char **, char **, double ** ) const;
    OGRErr      exportToUSGS( long *, long *, double **, long * ) const;
    OGRErr      exportToPanorama( long *, long *, double **, long * ) const;
    OGRErr      exportToXML( char **, const char * = NULL ) const;
    OGRErr      exportToPanorama( long *, long *, long *, long *, double *,
                                  double *, double *, double * ) const;
    OGRErr      importFromWkt( char ** );
    OGRErr      importFromProj4( const char * );
    OGRErr      importFromEPSG( int );
    OGRErr      importFromESRI( char ** );
    OGRErr      importFromPCI( const char *, const char * = NULL,
                               double * = NULL );
    OGRErr      importFromUSGS( long, long, double *, long );
    OGRErr      importFromPanorama( long, long, long, long,
                                    double, double, double, double );
    OGRErr      importFromWMSAUTO( const char *pszAutoDef );
    OGRErr      importFromXML( const char * );
    OGRErr      importFromDict( const char *pszDict, const char *pszCode );
    OGRErr      importFromURN( const char * );

    OGRErr      morphToESRI();
    OGRErr      morphFromESRI();

    OGRErr      Validate();
    OGRErr      StripCTParms( OGR_SRSNode * = NULL );
    OGRErr      FixupOrdering();
    OGRErr      Fixup();

    // Machinary for accessing parse nodes
    OGR_SRSNode *GetRoot() { return poRoot; }
    const OGR_SRSNode *GetRoot() const { return poRoot; }
    void        SetRoot( OGR_SRSNode * );
    
    OGR_SRSNode *GetAttrNode(const char *);
    const OGR_SRSNode *GetAttrNode(const char *) const;
    const char  *GetAttrValue(const char *, int = 0) const;

    OGRErr      SetNode( const char *, const char * );
    OGRErr      SetNode( const char *, double );
    
    OGRErr      SetLinearUnitsAndUpdateParameters( const char *pszName, 
                                                   double dfInMeters );
    OGRErr      SetLinearUnits( const char *pszName, double dfInMeters );
    double      GetLinearUnits( char ** = NULL ) const;

    OGRErr      SetAngularUnits( const char *pszName, double dfInRadians );
    double      GetAngularUnits( char ** = NULL ) const;

    double      GetPrimeMeridian( char ** = NULL ) const;

    int         IsGeographic() const;
    int         IsProjected() const;
    int         IsLocal() const;
    int         IsSameGeogCS( const OGRSpatialReference * ) const;
    int         IsSame( const OGRSpatialReference * ) const;

    void        Clear();
    OGRErr      SetLocalCS( const char * );
    OGRErr      SetProjCS( const char * );
    OGRErr      SetProjection( const char * );
    OGRErr      SetGeogCS( const char * pszGeogName,
                           const char * pszDatumName,
                           const char * pszEllipsoidName,
                           double dfSemiMajor, double dfInvFlattening,
                           const char * pszPMName = NULL,
                           double dfPMOffset = 0.0,
                           const char * pszUnits = NULL,
                           double dfConvertToRadians = 0.0 );
    OGRErr      SetWellKnownGeogCS( const char * );
    OGRErr      CopyGeogCSFrom( const OGRSpatialReference * poSrcSRS );

    OGRErr      SetFromUserInput( const char * );

    OGRErr      SetTOWGS84( double, double, double,
                            double = 0.0, double = 0.0, double = 0.0,
                            double = 0.0 );
    OGRErr      GetTOWGS84( double *padfCoef, int nCoeff = 7 ) const;
    
    double      GetSemiMajor( OGRErr * = NULL ) const;
    double      GetSemiMinor( OGRErr * = NULL ) const;
    double      GetInvFlattening( OGRErr * = NULL ) const;

    OGRErr      SetAuthority( const char * pszTargetKey, 
                              const char * pszAuthority, 
                              int nCode );

    OGRErr      AutoIdentifyEPSG();

    const char *GetAuthorityCode( const char * pszTargetKey ) const;
    const char *GetAuthorityName( const char * pszTargetKey ) const;

    const char *GetExtension( const char *pszTargetKey, 
                              const char *pszName,
                              const char *pszDefault = NULL ) const;
    OGRErr      SetExtension( const char *pszTargetKey, 
                              const char *pszName, 
                              const char *pszValue );
                           
    OGRErr      SetProjParm( const char *, double );
    double      GetProjParm( const char *, double =0.0, OGRErr* = NULL ) const;

    OGRErr      SetNormProjParm( const char *, double );
    double      GetNormProjParm( const char *, double=0.0, OGRErr* =NULL)const;