using System;
using System.Collections.Generic;
using System.Linq;
using Xamarin.Forms;
using Xamarin.Forms.DataGrid;
using Aurora.Backend.Models.Media;

namespace Aurora.Frontend.Components.Queue
{
    public partial class Queue : ContentView
    {
        public Queue()
        {
            InitializeComponent();
        }

        #region ItemsSource Property
        /// <summary>
        /// Bindable Property for the ItemsSource of the datagrid.
        /// </summary>
        /// <param name=""ItemsSource""></param>
        /// <param name="typeof(IEnumerable<object>"></param>
        /// <returns></returns>
        public static readonly BindableProperty ItemsSourceProperty =
            BindableProperty.Create(propertyName: "ItemsSource",
            returnType: typeof(IEnumerable<object>),
            declaringType: typeof(Queue),
            defaultBindingMode: BindingMode.Default,
            propertyChanged: OnItemsSourceChanged);

        /// <summary>
        /// Backing property for the ItemsSource property.
        /// </summary>
        /// <value></value>
        public IEnumerable<object> ItemsSource
        {
            get
            {
                return (IEnumerable<object>)GetValue(ItemsSourceProperty);
            }
            set
            {
                SetValue(ItemsSourceProperty, value);
            }
        }

        /// <summary>
        /// ItemsSource Changed event handler
        /// </summary>
        /// <param name="bindable"></param>
        /// <param name="oldValue"></param>
        /// <param name="newValue"></param>
        private static void OnItemsSourceChanged(BindableObject bindable, object oldValue, object newValue)
        {
            Queue control = bindable as Queue;
            var queueDataGrid = control.FindByName("QueueDataGrid") as DataGrid;
            queueDataGrid.ItemsSource = newValue as IEnumerable<object>;
        }

        #endregion ItemsSource Property

        /// <summary>
        /// Bindable property for the selected item field on the datagrid.
        /// </summary>
        /// <param name=""SelectedItem""></param>
        /// <param name="typeof(BaseMetadata"></param>
        /// <returns></returns>
        public static readonly BindableProperty SelectedItemProperty =
            BindableProperty.Create(propertyName: "SelectedItem",
            returnType: typeof(object),
            declaringType: typeof(Queue),
            defaultBindingMode: BindingMode.TwoWay,
            propertyChanged: OnSelectedItemChanged);

        /// <summary>
        /// Backing property for the SelectedItem property.
        /// </summary>
        /// <value></value>
        public object SelectedItem
        {
            get
            {
                return ((object)GetValue(SelectedItemProperty));
            }
            set
            {
                SetValue(SelectedItemProperty, value);
            }
        }

        /// <summary>
        /// Handles selection change events.
        /// </summary>
        /// <param name="bindable">The bindable object.</param>
        /// <param name="newValue"></param>
        /// <param name="oldValue"></param>
        private static void OnSelectedItemChanged(BindableObject bindable, object newValue, object oldValue)
        {
            Queue control = bindable as Queue;
            var queueDataGrid = control.FindByName("QueueDataGrid") as DataGrid;
            IEnumerable<object> source = (IEnumerable<object>)queueDataGrid.ItemsSource;
            if (source.Contains(newValue))
            {
                queueDataGrid.SelectedItem = newValue;
            }

        }
    }
}