public class RESTGetHttpContentCallout {
    private static final String htmlBadgesClass = 'tds-tally__count tds-tally__count_success">';
    private static final String htmlPointsClass = 'tds-tally__count tds-tally__count_success">'; 
    private static final String htmlTrailsClass = 'tds-tally__count tds-tally__count_success">';
    private static final String htmlBadgesJson = '<div data-react-class="BadgesPanel" data-react-props="';
    private static final string JsonFinalChar = '">';
    private static integer modulos = 0, superbadges = 0, eventos = 0, projetos = 0;
    
    
    public static Map<String, String> getCalloutResponseContents(String url){
        HttpResponse res = new HttpResponse();
        try{
            Http h = new Http();
            HttpRequest req = new HttpRequest();
            req.setEndpoint(url);
            req.setMethod('GET'); 
            req.setHeader('Content-Type', 'application/json');
            System.debug('req' + req);
            res = h.send(req);
            System.debug('THBS ---- res' + res);
        }catch(Exception e){
            System.debug('An exception occurred: ' + e.getMessage());
        }
        String lBody = res.getBody(); 
       
        System.debug('THBS ---- res.getBody();' + res.getBody());
        String lContactBadges = getValue( htmlBadgesClass, lBody );
        String lContactPoints = getValue( htmlPointsClass, lBody );
        String lContactTrails = getValue( htmlTrailsClass, lBody );
        String lJsonBadges = getJsonValue( htmlBadgesJson, JsonFinalChar, lBody);
        system.debug('--->> ' + lContactBadges);
        system.debug('THBS ---- lContactPoints' + lContactPoints);
        System.debug('THBS ---- lContactTrails' + lContactTrails);
        Map<String,String> lMapToReturn = new Map<String,String>();
        lMapToReturn.put('Badges', lContactBadges); 
        lMapToReturn.put('Pontos', lContactPoints);
        lMapToReturn.put('Trails', lContactTrails);
        lMapToReturn.put('Modulos', string.valueOf(modulos));
        lMapToReturn.put('Superbadges', string.valueOf(superbadges));
        lMapToReturn.put('Projetos', string.valueOf(projetos));
        lMapToReturn.put('Eventos', string.valueOf(eventos));
        system.debug('THBS ---- lMapToReturn' + JSON.serialize(lMapToReturn));
        return lMapToReturn;
    }
    
    private static String getJsonValue(string aClass, string finalChar, string aBody){
        Integer lInit = getInitialLocationByAttributeClass(aClass, aBody);
        Integer lEnd = getFinalLocationByInitialLocationAndFinalChar(lInit, finalChar, aBody);
        return getAttributeValues(lInit, lEnd, aBody);
    }  
    
    private static String getValue( String aClass, String aBody )
    {
        Integer lInit = getInitialLocationByAttributeClass(aClass, aBody);
        Integer lEnd = getFinalLocationByInitialLocation(lInit, aBody);
        return getAttributeValues(lInit, lEnd, aBody);
    }
    
    private static Integer getInitialLocationByAttributeClass(String lClassName, String lBody){
        System.debug('THBS ---- lClassName' + lClassName);
        System.debug('THBS ---- lClassName length' + lClassName.length());
        System.debug('THBS ---- lBody.indexOf(lClassName)' + lBody.indexOf(lClassName));
        return lBody.indexOf(lClassName) + lClassName.length();   
    }
    
    private static Integer getFinalLocationByInitialLocation(Integer lInitialLocation, String lBody){
        return lBody.indexOf('</html>',lInitialLocation);      
    }
    private static Integer getFinalLocationByInitialLocationAndFinalChar(Integer lInitialLocation, string finalChar ,String lBody){
        return lBody.indexOf(finalChar,lInitialLocation);      
    }
    
    private static String getAttributeValues(Integer lAttrInitialLocation, Integer lAttrFinalLocation, String lBody){
        System.debug('THBS ---- lAttrFinalLocation' + lAttrFinalLocation);
        System.debug('THBS ---- lBody' + lBody);
        System.debug('THBS ---- lAttrInitialLocation' + lAttrInitialLocation);
         
        return lBody.substring(lAttrInitialLocation,lAttrFinalLocation).replace('\n','');  
    }
    
}