// ------------------------------------------------------------------------------
// Copyright 2014 Microsoft Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------------

using PhotoSkyCSharp.Data;

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Item Detail Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234232

namespace PhotoSkyCSharp
{
    /// <summary>
    /// A page that displays details for a single item within a group while allowing gestures to
    /// flip through other items belonging to the same group.
    /// </summary>
    public sealed partial class ItemDetailPage : PhotoSkyCSharp.Common.LayoutAwarePage
    {
        public ItemDetailPage()
        {
            this.InitializeComponent();
        }

        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
            // Allow saved page state to override the initial item to display
            if (pageState != null && pageState.ContainsKey("SelectedItem"))
            {
                navigationParameter = pageState["SelectedItem"];
            }

            // TODO: Create an appropriate data model for your problem domain to replace the sample data
            var item = SkyDriveDataSource.GetItem((String)navigationParameter);
            this.DefaultViewModel["Group"] = item.Group;
            this.DefaultViewModel["Items"] = item.Group.Items;
            this.flipView.SelectedItem = item;
        }

        /// <summary>
        /// Preserves state associated with this page in case the application is suspended or the
        /// page is discarded from the navigation cache.  Values must conform to the serialization
        /// requirements of <see cref="SuspensionManager.SessionState"/>.
        /// </summary>
        /// <param name="pageState">An empty dictionary to be populated with serializable state.</param>
        protected override void SaveState(Dictionary<String, Object> pageState)
        {
            var selectedItem = (SkyDriveItem)this.flipView.SelectedItem;
            pageState["SelectedItem"] = selectedItem.UniqueId;
        }
    }
}
