package de.thedevstack.conversationsplus.ui.listeners;

import android.widget.ListView;

import com.orangegangsters.github.swipyrefreshlayout.library.SwipyRefreshLayout;
import com.orangegangsters.github.swipyrefreshlayout.library.SwipyRefreshLayoutDirection;

import java.util.List;

import de.thedevstack.android.logcat.Logging;
import de.thedevstack.conversationsplus.Config;
import de.thedevstack.conversationsplus.R;
import de.thedevstack.conversationsplus.entities.Conversation;
import de.thedevstack.conversationsplus.entities.Message;
import de.thedevstack.conversationsplus.services.MessageArchiveService;
import de.thedevstack.conversationsplus.ui.ConversationActivity;
import de.thedevstack.conversationsplus.ui.ConversationFragment;
import de.thedevstack.conversationsplus.ui.adapter.MessageAdapter;

/**
 * This listener starts loading messages from the server.
 */
public class ConversationSwipeRefreshListener implements SwipyRefreshLayout.OnRefreshListener {
    private List<Message> messageList;
    private ConversationFragment fragment;
    private ConversationMoreMessagesLoadedListener listener;

    public ConversationSwipeRefreshListener(List<Message> messageList, SwipyRefreshLayout swipeLayout, ConversationFragment fragment, ListView messagesView, MessageAdapter messageListAdapter) {
        this.messageList = messageList;
        this.fragment = fragment;
        this.listener = new ConversationMoreMessagesLoadedListener(swipeLayout, messageList, fragment, messagesView, messageListAdapter);
    }

    @Override
    public void onRefresh(SwipyRefreshLayoutDirection direction) {
        Logging.d(Config.LOGTAG, "Refresh swipe container");
        Logging.d(Config.LOGTAG, "Refresh direction " + direction);
        synchronized (this.messageList) {
            long timestamp;
            if (SwipyRefreshLayoutDirection.TOP == direction) { // Load history -> messages sent/received before first message in database
                if (messageList.isEmpty()) {
                    timestamp = System.currentTimeMillis();
                } else {
                    timestamp = this.messageList.get(0).getTimeSent(); // works only because of the ordering (last msg = first msg in list)
                }
                ConversationActivity activity = (ConversationActivity) fragment.getActivity();
                this.listener.setLoadHistory(true);
                activity.xmppConnectionService.loadMoreMessages(activity.getSelectedConversation(), timestamp, this.listener);
            } else if (SwipyRefreshLayoutDirection.BOTTOM == direction) { // load messages sent/received between last received or last session establishment and now
                Logging.d("mam", "loading missing messages from mam (last session establishing or last received message)");
                final ConversationActivity activity = (ConversationActivity) fragment.getActivity();
                long lastSessionEstablished = this.getTimestampOfLastSessionEstablished(activity.getSelectedConversation());
                long lastReceivedMessage = this.getTimestampOfLastReceivedOrTransmittedMessage();
                long startTimestamp = Math.min(lastSessionEstablished, lastReceivedMessage);
                MessageArchiveService.Query query = activity.xmppConnectionService.getMessageArchiveService().query(activity.getSelectedConversation(), startTimestamp, System.currentTimeMillis(), this.listener);
                if (query != null) {
                    this.listener.setLoadHistory(false);
                } else {
                    Logging.d("mam", "no query built - no messages loaded");
                    this.listener.onMoreMessagesLoaded(0, activity.getSelectedConversation());
                    this.listener.informUser(R.string.no_more_history_on_server);
                }
                this.listener.informUser(R.string.fetching_history_from_server);
            }
        }
        Logging.d(Config.LOGTAG, "End Refresh swipe container");
    }

    private long getTimestampOfLastReceivedOrTransmittedMessage() {
        long lastReceivedOrTransmittedMessage = Long.MAX_VALUE;
        if (null != this.messageList
                && !this.messageList.isEmpty()) {
            int lastMessageIndex = this.messageList.size() - 1;
            if (0 <= lastMessageIndex && this.messageList.size() > lastMessageIndex) {
                lastReceivedOrTransmittedMessage = this.messageList.get(lastMessageIndex).getTimeSent();
            }
        }

        return lastReceivedOrTransmittedMessage;
    }

    private long getTimestampOfLastSessionEstablished(Conversation conversation) {
        long lastSessionEstablished = Long.MAX_VALUE;
        if (null != conversation
                && null != conversation.getAccount()
                && null != conversation.getAccount().getXmppConnection()) {
            lastSessionEstablished = conversation.getAccount().getXmppConnection().getLastSessionEstablished();
        }
        return lastSessionEstablished;
    }
}