/**
@module MistAPI Backend
*/


var allowedBrowserBarStyles = ['transparent'];


/**
Filters a id the id to only contain a-z A-Z 0-9 _ -.

@method filterId
*/
var filterId = function (str) {
    var newStr = '';
    var i;
    for (i = 0; i < str.length; i += 1) {
        if (/[a-zA-Z0-9_-]/.test(str.charAt(i))) {
            newStr += str.charAt(i);
        }
    }
    return newStr;
};


var sound = document.createElement('audio');

/**
The backend side of the mist API.

@method mistAPIBackend
*/
mistAPIBackend = function (event) {
    var template = this.template;
    var webview = this.webview;
    var arg = event.args[0];

    // console.trace('mistAPIBackend event', event);

    if (event.channel === 'setWebviewId') {
        Tabs.update(template.data._id, { $set: { webviewId: webview.getWebContents().id } });
    }

    // Send TEST DATA
    if (event.channel === 'sendTestData') {
        var tests = Tabs.findOne('tests');

        if (tests) {
            web3.eth.getCoinbase(function (e, coinbase) {
                webview.send('uiAction_sendTestData', tests.permissions, coinbase);
            });
        }
    }

    // SET FAVICON
    if (event.channel === 'favicon') {
        Tabs.update(template.data._id, { $set: {
            icon: Blaze._escape(arg || ''),
        } });
    }

    // SET APPBAR
    if (event.channel === 'appBar') {
        var appBarClass = Blaze._escape(arg || '');

        Tabs.update(template.data._id, { $set: {
            appBar: (_.contains(allowedBrowserBarStyles, appBarClass) ? appBarClass : null)
        }});
    }
    if (event.channel === 'mistAPI_sound') {
        sound.pause();
        sound.src = Blaze._escape('file://'+ dirname +'/sounds/' + arg + '.mp3');
        sound.play();
    }

    // STOP HERE, IF BROWSER
    if (template.data._id === 'browser') {
        return;
    }

    // Actions: --------

    if (event.channel === 'mistAPI_setBadge') {
        Tabs.update(template.data._id, { $set: {
            badge: arg,
        } });
    }

    if (event.channel === 'mistAPI_menuChanges' && arg instanceof Array) {
        arg.forEach(function (eventArg) {
            var query;

            if (eventArg.action === 'addMenu') {
                // filter ID
                if (eventArg.entry && eventArg.entry.id) {
                    eventArg.entry.id = filterId(eventArg.entry.id);
                }

                query = { $set: {} };

                if (eventArg.entry.id) {
                    query.$set['menu.' + eventArg.entry.id + '.id'] = eventArg.entry.id;
                }

                query.$set['menu.' + eventArg.entry.id + '.selected'] = !!eventArg.entry.selected;

                if (!_.isUndefined(eventArg.entry.position)) {
                    query.$set['menu.' + eventArg.entry.id + '.position'] = eventArg.entry.position;
                }
                if (!_.isUndefined(eventArg.entry.name)) {
                    query.$set['menu.' + eventArg.entry.id + '.name'] = eventArg.entry.name;
                }
                if (!_.isUndefined(eventArg.entry.badge)) {
                    query.$set['menu.' + eventArg.entry.id + '.badge'] = eventArg.entry.badge;
                }

                Tabs.update(template.data._id, query);
            }

            if (eventArg.action === 'selectMenu') {
                var tab = Tabs.findOne(template.data._id);

                for (var e in tab.menu) {
                    if ({}.hasOwnProperty.call(tab.menu, e)) {
                        tab.menu[e].selected = (e === eventArg.id);
                    }
                }
                Tabs.update(template.data._id, { $set: { menu: tab.menu } });
            }

            if (eventArg.action === 'removeMenu') {
                var removeQuery = { $unset: {} };

                removeQuery.$unset['menu.' + eventArg.id] = '';

                Tabs.update(template.data._id, removeQuery);
            }

            if (eventArg.action === 'clearMenu') {
                Tabs.update(template.data._id, { $set: { menu: {} } });
            }
        });
    }
};