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// This file contains the declaration of the CreateBalloonText function.

// Every KML Feature may have an associated "description balloon". By default,
// this is an HTML composition of the Feature's name and description. It may
// be overridden with the use of BalloonStyle, and may further be modified
// by the use of entity replacements (such as "$[name]") and by supplying
// various combinations of ExtendedData elements.
// A useful guide for the various combinations of the latter can be found here:
// http://code.google.com/apis/kml/documentation/extendeddata.html
// For more information, see the OGC KML 2.2 specificication. In particular,
// sections 6.5 and 9.1.3.10.

#ifndef KML_ENGINE_FEATURE_BALLOON_H__
#define KML_ENGINE_FEATURE_BALLOON_H__

#include "kml/dom/feature.h"
#include "kml/engine/kml_file.h"

namespace kmlengine {

// Returns the markup for a Feature's "description balloon" (or "info window",
// in Google Maps-speak) as an HTML-formatted string. The text is composited
// from the KML roughly as follows:
// - The feature's styles are resolved and merged
// - All entity references are expanded to their full form. For more
// information on entity references, see:
// http://code.google.com/apis/kml/documentation/kmlreference.html#text
// - If a <BalloonStyle> and <description> are supplied, the description with
// expanded entities is returned. Otherwise, a default name and description
// balloon is created, identical to that shown by Google Earth 5.1 and earlier.
// - If no <description> is supplied but the feature has <ExtendedData>, a
// description is created from that ExtendedData similar to Google Earth's
// behavior. The format is:
// data_displayname | data_value (if displayName)
// data_name | data_value (if  not displayName)
// schema_name:simplefield_displayName | simpledata_value (if displayName)
// schema_name:simplefield_name | simpledata_value (if not displayName)
//
// It is the caller's responsibility to ensure that the feature exists within
// the kml_file.
string CreateBalloonText(const KmlFilePtr& kml_file,
                         const kmldom::FeaturePtr& feature);

}  // end namespace kmlengine

#endif  // KML_ENGINE_FEATURE_BALLOON_H__