/*
 * vim: ts=4:sw=4:expandtab
 */

;(function() {
    'use strict';
    console.log('background page reloaded');
    // register some chrome listeners
    if (chrome.notifications) {
        chrome.notifications.onClicked.addListener(function() {
            extension.notification.clear();
            Whisper.Notifications.onclick();
        });
        chrome.notifications.onButtonClicked.addListener(function() {
            extension.notification.clear();
            Whisper.Notifications.clear();
            getInboxCollection().each(function(model) {
                model.markRead();
            });
        });
        chrome.notifications.onClosed.addListener(function(id, byUser) {
            if (byUser) {
                Whisper.Notifications.clear();
            }
        });
    }

    // Close and reopen existing windows
    var open = false;
    chrome.app.window.getAll().forEach(function(appWindow) {
        open = true;
        appWindow.close();
    });

    // start a background worker for ecc
    textsecure.protocol_wrapper.startWorker();

    extension.onLaunched(function() {
        console.log('extension launched');
        storage.onready(function() {
            if (textsecure.registration.everDone()) {
                openInbox();
            }
            if (!textsecure.registration.isDone()) {
                extension.install();
            }
        });
    });

    var SERVER_URL = 'https://textsecure-service-staging.whispersystems.org';
    var ATTACHMENT_SERVER_URL = 'https://whispersystems-textsecure-attachments-staging.s3.amazonaws.com';
    var messageReceiver;
    window.getSocketStatus = function() {
        if (messageReceiver) {
            return messageReceiver.getStatus();
        } else {
            return -1;
        }
    };
    window.getAccountManager = function() {
        var USERNAME = storage.get('number_id');
        var PASSWORD = storage.get('password');
        return new textsecure.AccountManager(SERVER_URL, USERNAME, PASSWORD);
    };

    storage.fetch();
    storage.onready(function() {
        window.dispatchEvent(new Event('storage_ready'));
        setUnreadCount(storage.get("unreadCount", 0));

        if (textsecure.registration.isDone()) {
            extension.keepAwake();
            init();
        }

        extension.on('registration_done', function() {
            extension.keepAwake();
            init(true);
        });

        if (open) {
            openInbox();
        }
    });

    function init(firstRun) {
        window.removeEventListener('online', init);
        if (!textsecure.registration.isDone()) { return; }

        if (messageReceiver) { messageReceiver.close(); }

        var USERNAME = storage.get('number_id');
        var PASSWORD = storage.get('password');
        var mySignalingKey = storage.get('signaling_key');

        // initialize the socket and start listening for messages
        messageReceiver = new textsecure.MessageReceiver(SERVER_URL, USERNAME, PASSWORD, mySignalingKey, ATTACHMENT_SERVER_URL);
        messageReceiver.addEventListener('message', onMessageReceived);
        messageReceiver.addEventListener('receipt', onDeliveryReceipt);
        messageReceiver.addEventListener('contact', onContactReceived);
        messageReceiver.addEventListener('group', onGroupReceived);
        messageReceiver.addEventListener('sent', onSentMessage);
        messageReceiver.addEventListener('read', onReadReceipt);
        messageReceiver.addEventListener('error', onError);

        window.textsecure.messaging = new textsecure.MessageSender(SERVER_URL, USERNAME, PASSWORD, ATTACHMENT_SERVER_URL);
        if (firstRun === true && textsecure.storage.user.getDeviceId() != '1') {
            var syncRequest = new textsecure.SyncRequest(textsecure.messaging, messageReceiver);
            syncRequest.addEventListener('success', function() {
                console.log('sync successful');
                window.dispatchEvent(new Event('textsecure:contactsync'));
            });
            syncRequest.addEventListener('timeout', function() {
                console.log('sync timed out');
                window.dispatchEvent(new Event('textsecure:contactsync'));
            });
        }
    }

    function onContactReceived(ev) {
        var contactDetails = ev.contactDetails;
        ConversationController.create({
            name: contactDetails.name,
            id: contactDetails.number,
            avatar: contactDetails.avatar,
            type: 'private'
        }).save();
    }

    function onGroupReceived(ev) {
        var groupDetails = ev.groupDetails;
        var conversation = ConversationController.create({
            id: groupDetails.id,
            name: groupDetails.name,
            members: groupDetails.members,
            avatar: groupDetails.avatar,
            type: 'group',
        });
        if (!groupDetails.active) {
            conversation.set({left: true});
        }
        conversation.save();
    }

    function onMessageReceived(ev) {
        var data = ev.data;
        var message = initIncomingMessage(data.source, data.timestamp);
        message.handleDataMessage(data.message);
    }

    function onSentMessage(ev) {
        var now = new Date().getTime();
        var data = ev.data;

        var message = new Whisper.Message({
            source         : textsecure.storage.user.getNumber(),
            sent_at        : data.timestamp,
            received_at    : now,
            conversationId : data.destination,
            type           : 'outgoing',
            sent           : true
        });

        message.handleDataMessage(data.message);
    }

    function initIncomingMessage(source, timestamp) {
        var now = new Date().getTime();

        var message = new Whisper.Message({
            source         : source,
            sent_at        : timestamp,
            received_at    : now,
            conversationId : source,
            type           : 'incoming',
            unread         : 1
        });

        return message;
    }

    function onError(ev) {
        var e = ev.error;
        console.log(e);
        console.log(e.stack);

        if (e.name === 'HTTPError' && (e.code == 401 || e.code == 403)) {
            textsecure.registration.remove();
            extension.install();
            return;
        }

        if (e.name === 'HTTPError' && e.code == -1) {
            // Failed to connect to server
            if (navigator.onLine) {
                console.log('retrying in 1 minute');
                setTimeout(init, 60000);
            } else {
                console.log('offline');
                messageReceiver.close();
                window.addEventListener('online', init);
            }
            return;
        }

        if (ev.proto) {
            if (e.name === 'MessageCounterError') {
                // Ignore this message. It is likely a duplicate delivery
                // because the server lost our ack the first time.
                return;
            }
            var envelope = ev.proto;
            var message = initIncomingMessage(envelope.source, envelope.timestamp.toNumber());
            message.saveErrors(e).then(function() {
                ConversationController.findOrCreatePrivateById(message.get('conversationId')).then(function(conversation) {
                    conversation.save({
                        active_at: Date.now(),
                        unreadCount: conversation.get('unreadCount') + 1
                    });
                    conversation.trigger('newmessage', message);
                    conversation.notify(message);
                });
            });
            return;
        }

        throw e;
    }

    function onReadReceipt(ev) {
        var timestamp = ev.timestamp.toNumber();
        var sender    = ev.sender;
        var messages  = new Whisper.MessageCollection();
        var groups    = new Whisper.ConversationCollection();
        console.log('read receipt ', sender, timestamp);
        groups.fetchGroups(sender).then(function() {
            messages.fetchSentAt(timestamp).then(function() {
                var ids = groups.pluck('id');
                ids.push(sender);
                var message = messages.find(function(message) {
                    return (message.get('type') === 'incoming' &&
                            _.contains(ids, message.get('conversationId')));
                });
                if (message) {
                    message.markRead().then(function() {
                        var conversation = ConversationController.get({
                            id: message.get('conversationId')
                        });

                        // notify frontend listeners
                        conversation.trigger('read', message);
                    });
                }
            });
        });
    }

    // lazy hack
    window.receipts = new Backbone.Collection();

    function onDeliveryReceipt(ev) {
        var pushMessage = ev.proto;
        var timestamp = pushMessage.timestamp.toNumber();
        var messages  = new Whisper.MessageCollection();
        var groups    = new Whisper.ConversationCollection();
        console.log('delivery receipt from', pushMessage.source + '.' + pushMessage.sourceDevice, timestamp);

        groups.fetchGroups(pushMessage.source).then(function() {
            messages.fetchSentAt(timestamp).then(function() {
                var ids = groups.pluck('id');
                ids.push(pushMessage.source);
                var message = messages.find(function(message) {
                    return (message.get('type') === 'outgoing' &&
                            _.contains(ids, message.get('conversationId')));
                });
                if (message) {
                    var deliveries = message.get('delivered') || 0;
                    message.save({delivered: deliveries + 1}).then(function() {
                        // notify frontend listeners
                        var conversation = ConversationController.get(
                            message.get('conversationId')
                        );
                        if (conversation) {
                            conversation.trigger('newmessage', message);
                        }
                    });
                    // TODO: consider keeping a list of numbers we've
                    // successfully delivered to?
                    return;
                }
                // if we get here, we didn't find a matching message.
                // keep the receipt in memory in case it shows up later
                // as a sync message.
                receipts.add({ timestamp: timestamp, source: pushMessage.source });
                return;
            });
        });
    }
})();