package comms.view.chat;

import java.util.ArrayList;
import java.util.Iterator;

import comms.model.chat.CallRequest;
import comms.model.chat.Conversation;
import comms.model.chat.Participant;
import comms.view.FeeddexApplication;
import comms.view.FeeddexPage;
import comms.view.FeeddexSession;

import comms.bus.CallRequestService;
import comms.bus.ChatService;

import org.apache.wicket.Component;
import org.apache.wicket.ResourceReference;
import org.apache.wicket.ajax.AbstractAjaxTimerBehavior;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.AjaxLink;
import org.apache.wicket.markup.html.IHeaderContributor;
import org.apache.wicket.markup.html.IHeaderResponse;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.list.ListItem;
import org.apache.wicket.markup.html.list.ListView;
import org.apache.wicket.model.AbstractReadOnlyModel;

/**
 * <p>
 * This page contains a regular Wicket component showing the available agents and
 * a separate component timer with AbstractAjaxTimerBehavior. This timer will
 * will each time send a piece of JavaScript containing list of the current
 * conversations and a function call to update the DOM to match this list.
 * </p>
 * <p>
 * In this (awkward) way we try to avoid focus issues with popup windows originating from
 * a dynamically created html element.
 * </p>
 * <p>
 * <em>NOTE: Just recently I learned that AjaxRequestTarget.setFocus(null) is supposed
 * to avoid any focus issues. Maybe with that the whole script hassle could be avoided
 * </em>
 * </p> 
 */
public class Conversations extends FeeddexPage implements IHeaderContributor {

  //FIXME Check access to this page
	// public Conversations( PageParameters pars ) {
	// this( pars.getString( "service" ), pars.getString("participant"));
	// }

	public Conversations() {
		this(FeeddexSession.get().getOrganisationId().toString(),
				FeeddexSession.getMe().getChatName());
	}

	public Conversations(final String serviceId, final Object participant) {
		add(createUpdater("timer", serviceId, participant));
		add(createAvailableAgents("availableAgents", serviceId ));
	}

	private Component createAvailableAgents(String id, final String serviceId) {
		final WebMarkupContainer agents = new WebMarkupContainer( id );
		agents.setOutputMarkupId(true);
		ListView list = new ListView( "list", new AbstractReadOnlyModel(){
			@Override
			public Object getObject() {
				return new ArrayList<Object>(ChatService.getInstance(serviceId).getAvailableAgents());
			}			
		} ){
			@Override
			protected void populateItem(final ListItem item) {
				item.add( new Label( "agent", new AbstractReadOnlyModel() {
					@Override
					public Object getObject() {
						return item.getModelObject().toString();
					}
				}));
			}			
		};
		agents.add( list );
		
		WebMarkupContainer myAvailability = new WebMarkupContainer( "myAvailability" );
		myAvailability.add(new Label("description", new AbstractReadOnlyModel() {
			@Override
			public Object getObject() {
				String key = ChatService.getInstance(serviceId).isAvailable(
						FeeddexSession.get().getChatParticipant()) ? "available"
						: "not_available";
				return getString(key);
			}
		}));
		myAvailability.add(new AjaxLink("toggle") {
			@Override
			public void onClick(AjaxRequestTarget target) {
				ChatService service = ChatService.getInstance(serviceId);
				Participant participant = FeeddexSession.get().getChatParticipant();
				service.setAvailable(participant, !service.isAvailable(participant));
				target.addComponent(agents);
			}
		});
		agents.add( myAvailability );
		
		return agents;
	}

	/**
	 * An AjaxTimers that will return a list 
	 * @param id
	 * @param serviceId
	 * @param participant
	 * @return
	 */
	private Component createUpdater(String id, final String serviceId,
			final Object participant) {
		Component timer = new WebMarkupContainer("timer");
		timer.add(new AbstractAjaxTimerBehavior(ChatService.getPollInterval()) {

			@Override
			protected void onTimer(AjaxRequestTarget target) {
				target.appendJavascript(createUpdateScript());
        target.focusComponent(null);
			}

			private String createUpdateScript() {
				StringBuffer buf = new StringBuffer();
				appendConversationsUpdateScript(buf);
				appendCallRequestsUpdateScript(buf);
				return buf.toString();
			}

			private void appendConversationsUpdateScript(StringBuffer buf) {

				String urlBase = FeeddexApplication.getUrlAgentChat()
						+ "/service/" + serviceId + "/participant/"
						+ participant + "/conversation/";
				buf.append("var conversations = new Array(");
				ChatService service = ChatService.getInstance(serviceId);
				Iterator<Conversation> itr = service.getAllConversations()
						.iterator();
				if (itr.hasNext()) {
					Conversation conversation = itr.next();
					buf.append(toJavaScriptString(urlBase, conversation));
					while (itr.hasNext()) {
						buf.append(",");
						conversation = itr.next();
						buf.append(toJavaScriptString(urlBase, conversation));
					}
				}
				buf.append(");");
				buf.append("updateConversations('conversations', conversations );");
			}

			private void appendCallRequestsUpdateScript(StringBuffer buf) {
				String urlBase = FeeddexApplication.getUrlCallRequest()
						+ "/service/" + serviceId + "/transaction/";
				buf.append("var callrequests = new Array(");
				CallRequestService service = CallRequestService
						.getInstance(serviceId);
				Iterator<CallRequest> itr = service.getAllCallRequests()
						.iterator();
				if (itr.hasNext()) {
					CallRequest callrequest = itr.next();
					buf.append(toJavaScriptString(urlBase, callrequest));
					while (itr.hasNext()) {
						buf.append(",");
						callrequest = itr.next();
						buf.append(toJavaScriptString(urlBase, callrequest));
					}
				}
				buf.append(");");
				buf
						.append("updateCallrequests('callrequests', callrequests );");
			}

			private String toJavaScriptString(String urlBase,
					Conversation conversation) {
				return "{id:'" + conversation.getId() + "',url:'" + urlBase
						+ conversation.getId() + "',name:'"
						+ getDescription(conversation) + "',state:'" + "QUEUED"
						+ // conversation.getStatus() +
						"'}";
			}

			private String getDescription(Conversation conversation) {
				return "Conversatie " + conversation.getId();
			}

			private String toJavaScriptString(String urlBase,
					CallRequest callrequest) {
				return "{id:'" + callrequest.getTransactionId() + "',url:'"
						+ urlBase + callrequest.getTransactionId() + "',name:'"
						+ getDescription(callrequest) + "'}";
			}

			private String getDescription(CallRequest callrequest) {
				return "Call me (" + callrequest.getCreated() + ")"; // TODO
																		// Phone
																		// number
			}

		});

		return timer;
	}

	public void renderHead(IHeaderResponse response) {
		response.renderCSSReference(
        new ResourceReference( this.getClass(), "Conversations.css"));
		response.renderJavascriptReference(
        new ResourceReference( this.getClass(), "Conversations.js"));
	}

}