package org.gcube.gcat.moderation.thread.social.messages;

import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import org.gcube.common.authorization.utils.manager.SecretManager;
import org.gcube.common.authorization.utils.manager.SecretManagerProvider;
import org.gcube.common.authorization.utils.secret.Secret;
import org.gcube.gcat.api.moderation.CMItemStatus;
import org.gcube.gcat.api.moderation.Moderated;
import org.gcube.gcat.moderation.thread.ModerationThread;
import org.gcube.gcat.social.SocialUsers;
import org.gcube.gcat.utils.Constants;
import org.gcube.social_networking.socialnetworking.model.beans.Message;
import org.gcube.social_networking.socialnetworking.model.beans.Recipient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Luca Frosini (ISTI - CNR)
 */
public class SocialMessageModerationThread extends ModerationThread {

	private static final Logger logger = LoggerFactory.getLogger(SocialMessageModerationThread.class);
	
	protected StringBuffer getMainItemInfo(StringBuffer stringBuffer) {
		stringBuffer.append("Status: ");
		stringBuffer.append(cmItemStatus.getFancyValue());
		stringBuffer.append("\n");
		stringBuffer.append("Title: ");
		stringBuffer.append(itemTitle);
		stringBuffer.append("\n");
		stringBuffer.append("Name: ");
		stringBuffer.append(itemName);
		stringBuffer.append("\n");
		stringBuffer.append("ID: ");
		stringBuffer.append(itemID);
		stringBuffer.append("\n");
		stringBuffer.append("URL: ");
		if(cmItemStatus == CMItemStatus.APPROVED) {
			stringBuffer.append(itemURL);
		}else {
			stringBuffer.append(getModerationURL());
		}
		stringBuffer.append("\n\n");
		return stringBuffer;
	}
	
	/**
	 * Create the message for an item that is created/updated
	 */
	public void postItemToBeManaged() throws Exception {
		/* 
		 * An example of created message is:
		 * 
		 * [mister x] created / updated the following item
		 * 
		 * Title: RESTful Transaction Model
		 * Name: my_first_restful_transaction_model
		 * ID: e31a6ba8-66ef-47b8-b61f-99a1366b4a69
		 * URL: https://data.dev.d4science.org/ctlg/devVRE/my_first_restful_transaction_model
		 * 
		 * You are kindly requested to review it and decide either to APPROVE or REJECT it at <url of the item>
		 * 
		 */
		cmItemStatus = CMItemStatus.PENDING;
		String fullName = ckanUser.getNameSurname();
		StringBuffer stringBuffer = new StringBuffer();
		stringBuffer.append(fullName);
		stringBuffer.append(create ? " created " : " updated ");
		stringBuffer.append("the following item\n\n");
		stringBuffer = getMainItemInfo(stringBuffer);
		stringBuffer.append("You are kindly requested to review it and decide either to APPROVE or REJECT it.");
		// stringBuffer.append("You are kindly requested to review it and decide either to APPROVE or REJECT at");
		// String manageURL = getManageURL();
		// stringBuffer.append(manageURL);
		postMessage(stringBuffer.toString());
	}
	
	
	public void postItemCreated() throws Exception {
		create = true;
		cmItemStatus = CMItemStatus.PENDING;
		postItemToBeManaged();
	}

	public void postItemUpdated() throws Exception {
		create = false;
		cmItemStatus = CMItemStatus.PENDING;
		postItemToBeManaged();
	}
	
	protected StringBuffer addUserWithRole(String fullName, String role, StringBuffer stringBuffer) {
		stringBuffer.append(fullName);
		stringBuffer.append(" [");
		stringBuffer.append(role);
		stringBuffer.append("] ");
		return stringBuffer;
	}
	
	public void postItemManaged(String userMessage) throws Exception {
		create = false;
		String fullName = ckanUser.getNameSurname();
		StringBuffer stringBuffer = new StringBuffer();
		stringBuffer = addUserWithRole(fullName, Moderated.CATALOGUE_MODERATOR, stringBuffer);
		stringBuffer.append(cmItemStatus.getValue());
		stringBuffer.append(" the following item");
		if(userMessage!=null && userMessage.length()>0) {
			stringBuffer.append(" with this accompanying message\n\n");
			stringBuffer = getMainItemInfo(stringBuffer);
			stringBuffer.append(userMessage);
		}else {
			stringBuffer.append("\n\n");
			stringBuffer = getMainItemInfo(stringBuffer);
		}
		postMessage(stringBuffer.toString());
	}

	@Override
	public void postItemRejected(String userMessage) throws Exception {
		create = false;
		cmItemStatus = CMItemStatus.REJECTED;
		postItemManaged(userMessage);
	}
	
	@Override
	public void postItemApproved(String userMessage) throws Exception {
		create = false;
		cmItemStatus = CMItemStatus.APPROVED;
		postItemManaged(userMessage);
	}
	
	protected String getSubject() {
		StringWriter stringWriter = new StringWriter();
		if(!create) {
			logger.trace("It's a reply");
			stringWriter.append("Re: ");
		}
		stringWriter.append("[Catalogue Service] ");
		stringWriter.append(itemTitle);
		return stringWriter.toString(); 
	}
	
	protected List<Recipient> getRecipients(Set<String> users) {
		List<Recipient> recipients = new ArrayList<>();
		for(String username : users) {
			recipients.add(new Recipient(username));
		}
		return recipients;		
	}
	
	protected Message getMessage(String messageString) throws Exception {
		Message message = new Message(); 
		message.setBody(messageString);
		message.setSubject(getSubject());
		Set<String> moderators = SocialUsers.getUsernamesByRole(Moderated.CATALOGUE_MODERATOR);
		List<Recipient> recipients = getRecipients(moderators);
		message.setRecipients(recipients);
		return message;
	}
	
	@Override
	protected void postMessage(String messageString) throws Exception {
		SecretManager secretManager = SecretManagerProvider.instance.get();
		String username = secretManager.getUser().getUsername();
		Message message = getMessage(messageString);
		List<Recipient> recipients = message.getRecipients();
		recipients.add(new Recipient(username));
		Secret secret = Constants.getCatalogueSecret();
		secretManager.startSession(secret);
		try {
			sendMessage(message);
		}finally {
			secretManager.endSession();
		}
	}

	@Override
	public void postUserMessage(CMItemStatus cmItemStatus, String userMessage) throws Exception {
		this.create = false;
		this.cmItemStatus = cmItemStatus;
		String fullName = ckanUser.getNameSurname();
		StringBuffer stringBuffer = new StringBuffer();
		stringBuffer = addUserWithRole(fullName, itemAuthor ? "Author" : Moderated.CATALOGUE_MODERATOR, stringBuffer);
		stringBuffer.append("sent a message regarding the following item\n\n");
		stringBuffer = getMainItemInfo(stringBuffer);
		stringBuffer.append(userMessage);
		Message message = getMessage(stringBuffer.toString());
		SecretManager secretManager = SecretManagerProvider.instance.get();
		String username = secretManager.getUser().getUsername();
		List<Recipient> recipients = message.getRecipients();
		recipients.add(new Recipient(username));
		Secret secret = Constants.getCatalogueSecret();
		secretManager.startSession(secret);
		try {
			sendMessage(message);
		}finally {
			secretManager.endSession();
		}
	}

	protected void sendMessage(Message message) throws Exception {
		SocialMessage socialMessage = new SocialMessage();
		socialMessage.setMessage(message);
		socialMessage.start();
	}

	@Override
	protected void createModerationThread() throws Exception {
		create = true;
		cmItemStatus = CMItemStatus.PENDING;
	}
	
}