/**
 * Proxy to access Google **[calendar resources](https://developers.google.com/google-apps/calendar/v3/reference/calendarList)**.
 */
Ext.define('Ext.google.data.CalendarsProxy', {
    extend: 'Ext.google.data.AbstractProxy',
    alias: 'proxy.google-calendars',

    requires: [
        'Ext.google.data.EventsProxy'
    ],

    googleApis: { 'calendar': { version: 'v3' } },

    /**
     * @method buildApiRequests
     * @protected
     * @inheritdoc
     */
    buildApiRequests: function(request) {
        var me = this,
            action = request.getAction();

        switch (action) {
            case 'read':
                return me.buildReadApiRequests(request);
            case 'update':
                return me.buildUpdateApiRequests(request);
            default:
                Ext.raise('unsupported request: calendars.' + action);

                return null;
        }
    },

    /**
     * @method extractResponseData
     * @protected
     * @inheritdoc
     */
    extractResponseData: function(response) {
        var me = this,
            data = me.callParent(arguments),
            items = [];

        // We assume that the response contains only results of the same kind.
        Ext.each(data.results, function(result) {
            switch (result.kind) {
                case 'calendar#calendarList':
                    items = items.concat(result.items.map(me.fromApiCalendar.bind(me)));
                    break;
                default:
                    break;
            }
        });

        return {
            items: me.sanitizeItems(items),
            success: data.success,
            error: data.error
        };
    },

    privates: {
        // https://developers.google.com/google-apps/calendar/v3/reference/calendarList#resource
        toApiCalendar: function(data) {
            var res = {};

            Ext.Object.each(data, function(key, value) {
                switch (key) {
                    case 'id':
                        res.calendarId = value;
                        break;
                    case 'hidden':
                        res.selected = !value;
                        break;
                    default:
                        break;
                }
            });

            return res;
        },

        // https://developers.google.com/google-apps/calendar/v3/reference/calendarList#resource
        fromApiCalendar: function(data) {
            var record = {
                hidden: !data.selected,
                editable: false,
                eventStore: {
                    autoSync: true,
                    proxy: {
                        type: 'google-events',
                        resourceTypes: 'events'
                    }
                }
            };

            Ext.Object.each(data, function(key, value) {
                switch (key) {
                    case 'id':
                    case 'description':
                        record[key] = value;
                        break;
                    case 'backgroundColor':
                        record.color = value;
                        break;
                    case 'summary':
                        record.title = value;
                        break;
                    case 'accessRole':
                        record.editable = (value == 'owner' || value == 'writer');
                        break;
                    default:
                        break;
                }
            });

            return record;
        },

        // https://developers.google.com/google-apps/calendar/v3/reference/calendarList/list
        buildReadApiRequests: function(request) {
            return gapi.client.calendar.calendarList.list();
        },

        // https://developers.google.com/google-apps/calendar/v3/reference/calendarList/patch
        buildUpdateApiRequests: function(request) {
            var data = this.toApiCalendar(request.getJsonData());

            return gapi.client.calendar.calendarList.patch(data);
        }
    }
});