package org.gcube.gcat.social;

import java.io.StringWriter;
import java.net.HttpURLConnection;
import java.util.ArrayList;
import java.util.List;

import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;

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.com.fasterxml.jackson.databind.node.ObjectNode;
import org.gcube.common.authorization.utils.manager.SecretManager;
import org.gcube.common.authorization.utils.socialservice.SocialService;
import org.gcube.common.gxhttp.request.GXHTTPStringRequest;
import org.gcube.gcat.persistence.ckan.CKANInstance;
import org.gcube.gcat.persistence.ckan.CKANUserCache;
import org.gcube.gcat.utils.Constants;
import org.gcube.gcat.utils.HTTPUtility;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Luca Frosini (ISTI - CNR)
 */
public class SocialPost extends Thread {
	
	private static final Logger logger = LoggerFactory.getLogger(SocialPost.class);
	
	public static final String ITEM_URL = "Item URL";
	
	// https://wiki.gcube-system.org/gcube/Social_Networking_Service#Write_application_post_2
	protected static final String SOCIAL_SERVICE_WRITE_APPLICATION_POST_PATH = "/2/posts/write-post-app";
	
	// String.format(NOTIFICATION_MESSAGE, fullName, title, url)
	protected static final String NOTIFICATION_MESSAGE = "%s just published the item \"%s\"\n"
			+ "Please find it at %s\n";
	
	protected static final String SOCIAL_POST_TEXT_KEY = "text";
	protected static final String SOCIAL_POST_ENABLE_NOTIFICATION_KEY = "enable_notification";
	protected static final String SOCIAL_POST_RESPONSE_SUCCESS_KEY = "success";
	protected static final String SOCIAL_POST_RESPONSE_MESSAGE_KEY = "message";
	
	protected final ObjectMapper objectMapper;
	
	protected String itemID;
	protected String itemURL;
	protected String itemTitle;
	protected List<String> tags;
	protected Boolean notification;
	
	public SocialPost() throws Exception {
		super();
		this.objectMapper = new ObjectMapper();
	}
	
	public String getItemID() {
		return itemID;
	}
	
	public void setItemID(String itemID) {
		this.itemID = itemID;
	}
	
	public String getItemURL() {
		return itemURL;
	}
	
	public void setItemURL(String itemURL) {
		this.itemURL = itemURL;
	}
	
	public String getItemTitle() {
		return itemTitle;
	}
	
	public void setItemTitle(String itemTitle) {
		this.itemTitle = itemTitle;
	}
	
	public List<String> getTags() {
		return tags;
	}
	
	public void setTags(List<String> tags) {
		this.tags = tags;
	}
	
	public void setTags(ArrayNode tags) {
		this.tags = new ArrayList<>();
		if(tags != null && tags.size() > 0) {
			for(int i = 0; i < tags.size(); i++) {
				JsonNode jsonNode = tags.get(i);
				String tagName = "";
				if(jsonNode.has("display_name")) {
					tagName = jsonNode.get("display_name").asText();
				} else {
					tagName = jsonNode.get("name").asText();
				}
				this.tags.add(tagName);
			}
		}
	}
	
	public Boolean isNotification() {
		return notification;
	}

	public void setNotification(Boolean notification) {
		this.notification = notification;
	}
	
	@Override
	public void run() {
		
		try {
			
			CKANInstance instance = CKANInstance.getInstance();
			
			if(!instance.isSocialPostEnabled()) {
				logger.info("Social Post are disabled in the context {}", SecretManager.instance.get().getContext());
				return;
			}
			logger.info("Going to send Social Post about the Item {} available at {}", itemID, itemURL);
			
			boolean notifyUsers = instance.isNotificationToUsersEnabled();
			
			if(notification != null) {
				if(notifyUsers) {
					notifyUsers = notifyUsers && notification;
				}else {
					notifyUsers = notification;
				}
			}
			
			// write notification post
			sendSocialPost(notifyUsers);
			
		} catch(Exception e) {
			logger.error("Error while executing post creation actions", e);
		}
	}
	
	public void sendSocialPost(boolean notifyUsers) {
		
		try {
			String fullName =  CKANUserCache.getCurrrentCKANUser().getNameSurname();
			
			String basePath = SocialService.getSocialService().getServiceBasePath();
			if(basePath == null) {
				logger.info("Unable to write a post because there is no social networking service available");
				return;
			}
			basePath = basePath.endsWith("/") ? basePath : basePath + "/";
			
			StringWriter messageWriter = new StringWriter();
			messageWriter.append(String.format(NOTIFICATION_MESSAGE, fullName, itemTitle, itemURL));
			
			for(String tag : tags) {
				tag = tag.trim();
				tag = tag.replaceAll(" ", "_").replace("_+", "_");
				if(tag.endsWith("_")) {
					tag = tag.substring(0, tag.length() - 1);
				}
				messageWriter.append("#");
				messageWriter.append(tag);
				messageWriter.append(" ");
			}
			String message = messageWriter.toString();
			
			logger.debug("The post that is going to be written is\n{}", message);
			
			ObjectNode objectNode = objectMapper.createObjectNode();
			objectNode.put(SOCIAL_POST_TEXT_KEY, message);
			objectNode.put(SOCIAL_POST_ENABLE_NOTIFICATION_KEY, notifyUsers);
			
			// Do not use ApplicationMode class here because is a thread and change the current token could impact 
			// on the other threads.
			
			GXHTTPStringRequest gxhttpStringRequest = GXHTTPStringRequest.newRequest(basePath);
			gxhttpStringRequest.from(Constants.CATALOGUE_NAME);
			gxhttpStringRequest.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON);
			gxhttpStringRequest.setSecurityToken(Constants.getCatalogueSecurityToken());
			gxhttpStringRequest.path(SOCIAL_SERVICE_WRITE_APPLICATION_POST_PATH);
			
			HttpURLConnection httpURLConnection = gxhttpStringRequest.post(objectMapper.writeValueAsString(objectNode));
			String ret = HTTPUtility.getResultAsString(httpURLConnection);
			JsonNode jsonNode = objectMapper.readTree(ret);
			if(jsonNode.get(SOCIAL_POST_RESPONSE_SUCCESS_KEY).asBoolean()) {
				logger.info("Post written : {}", message);
			} else {
				logger.info("Failed to write the post {}. Reason {}", message,
						jsonNode.get(SOCIAL_POST_RESPONSE_MESSAGE_KEY).asText());
			}
		} catch(Exception e) {
			logger.error("Unable to send Social Post", e);
		}
		
	}

}