enyo.kind({
    name: "ConversationStore",
    kind: "Component",
    conversations: {},
    retentionWindow: 86400,
    loadConversations: function() {
        var len = localStorage.length;
        for (var i = 0; i < len; i++) {
            var key = localStorage.key(i);
            if (key.match(/^conversation:/)) {
                var jid = key.replace(/^conversation:/, '');
                this.conversations[jid] = JSON.parse(localStorage[key]);
            }
        }
    },
    saveConversation: function(jid) {
        if (!(jid in this.conversations)) return;
        localStorage['conversation:' + jid] = JSON.stringify(this.conversations[jid]);
    },
    getConversation: function(jid) {
        if (jid in this.conversations) {
            // Be sure to return a copy
            return this.conversations[jid].messages.slice(0);
        } else {
            return [];
        }
    },
    getConversationSummary: function() {
        var res = []
        for (jid in this.conversations) {
            var len = this.conversations[jid].messages.length;
            var lastMessage = len > 0 ? this.conversations[jid].messages[len - 1] : '';
            res.push({
                jid: jid,
                outbound: lastMessage.outbound,
                message: lastMessage.message,
                receivedTimestamp: lastMessage.receivedTimestamp
            });
        }

        return res.sort(function(a, b) {
            if (a.receivedTimestamp > b.receivedTimestamp)
                return -1;
            if (a.receivedTimestamp < b.receivedTimestamp)
                return 1;
            return 0;
        });
    },
    appendConversation: function(jid, data) {
        if (!(jid in this.conversations)) {
            this.conversations[jid] = {
                lastMessageTimestamp: 0,
                messages: []
            };
        }
        this.conversations[jid].messages.push(data);
        this.conversations[jid].lastMessageTimestamp = (new Date()).getTime();
        this.cullConversation(jid);
        this.saveConversation(jid);
    },
    cullConversation: function(jid) {
        // TODO: implement message culling by retentionWindow
    }
});