package org.gcube.gcat.social;

import java.net.HttpURLConnection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.gcube.com.fasterxml.jackson.databind.JsonNode;
import org.gcube.com.fasterxml.jackson.databind.ObjectMapper;
import org.gcube.com.fasterxml.jackson.databind.node.ArrayNode;
import org.gcube.common.authorization.utils.socialservice.SocialService;
import org.gcube.common.gxhttp.request.GXHTTPStringRequest;
import org.gcube.gcat.utils.HTTPUtility;

/**
 * @author Luca Frosini (ISTI - CNR)
 */
public class SocialUsers {
	
	protected static final String GET_USERNAMES_BY_ROLE = "2/users/get-usernames-by-role";
	protected static final String GET_USERNAMES_BY_ROLE_ROLE_NAME_PARAMETER = "role-name";
	protected static final String GET_USERNAMES_BY_ROLE_RESULT_KEY = "result";

	public static Set<String> getUsernamesByRole(String roleName) throws Exception {
		String socialServiceBasePath = SocialService.getSocialService().getServiceBasePath();
		
		GXHTTPStringRequest gxhttpStringRequest = HTTPUtility.createGXHTTPStringRequest(socialServiceBasePath,
				GET_USERNAMES_BY_ROLE, false);
		Map<String,String> parameters = new HashMap<>();
		parameters.put(GET_USERNAMES_BY_ROLE_ROLE_NAME_PARAMETER, roleName);
		gxhttpStringRequest.queryParams(parameters);
		HttpURLConnection httpURLConnection = gxhttpStringRequest.get();
		
		String ret = HTTPUtility.getResultAsString(httpURLConnection);
		ObjectMapper objectMapper = new ObjectMapper();
		JsonNode jsonNode = objectMapper.readTree(ret);
		ArrayNode arrayNode = (ArrayNode) jsonNode.get(GET_USERNAMES_BY_ROLE_RESULT_KEY);
		
		Set<String> usernames = new HashSet<>();
		for(JsonNode node : arrayNode) {
			usernames.add(node.asText());
		}
		
		return usernames;
	}
	
}