using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL;
using Tango.BL.Entities;
using Tango.Core.Commands;
using Tango.PPC.Common;
using Tango.PPC.Common.Navigation;
using Tango.PPC.Jobs.NavigationObjects;
using Tango.Settings;

namespace Tango.PPC.Jobs.ViewModels
{
    /// <summary>
    /// Represents the twine catalog view model.
    /// </summary>
    /// <seealso cref="PPCViewModel" />
    /// <seealso cref="INavigationResultProvider{CatalogItem, TwineCatalogNavigationObject}" />
    public class TwineCatalogViewVM : PPCViewModel, INavigationResultProvider<ColorCatalogsItem, TwineCatalogNavigationObject>
    {
        private bool _confirmed;
        private ObservablesContext _db;

        private ColorCatalog _catalog;
        /// <summary>
        /// Gets or sets the catalog.
        /// </summary>
        public ColorCatalog Catalog
        {
            get { return _catalog; }
            set { _catalog = value; RaisePropertyChangedAuto(); }
        }

        private ColorCatalog _recent;
        /// <summary>
        /// Gets or sets the recent catalog items as a complete catalog.
        /// </summary>
        public ColorCatalog Recent
        {
            get { return _recent; }
            set { _recent = value; RaisePropertyChangedAuto(); }
        }

        private String _filter;
        /// <summary>
        /// Gets or sets the filter.
        /// </summary>
        /// <value>
        /// The filter.
        /// </value>
        public String Filter
        {
            get { return _filter; }
            set { _filter = value; RaisePropertyChangedAuto(); }
        }

        private ColorCatalogsItem _selectedItem;
        /// <summary>
        /// Gets or sets the selected item.
        /// </summary>
        public ColorCatalogsItem SelectedItem
        {
            get { return _selectedItem; }
            set
            {
                _selectedItem = value; RaisePropertyChangedAuto();
            }
        }

        /// <summary>
        /// Gets or sets the OK command.
        /// </summary>
        public RelayCommand OKCommand { get; set; }

        /// <summary>
        /// Initializes a new instance of the <see cref="TwineCatalogViewVM"/> class.
        /// </summary>
        public TwineCatalogViewVM()
        {
            OKCommand = new RelayCommand(Confirm);
        }

        /// <summary>
        /// Called when the application has been started.
        /// </summary>
        public override void OnApplicationStarted()
        {
            _db = ObservablesContext.CreateDefault();
        }

        /// <summary>
        /// Called when the navigation system has navigated to this VM view.
        /// </summary>
        public override void OnNavigatedTo()
        {
            base.OnNavigatedTo();
            _confirmed = false;
            Filter = "CATALOG";
        }

        /// <summary>
        /// Confirms this instance.
        /// </summary>
        private void Confirm()
        {
            if (SelectedItem != null)
            {
                var settings = SettingsManager.Default.GetOrCreate<JobsModuleSettings>();
                settings.AddRecentCatalogItem(Catalog, SelectedItem);
                SettingsManager.Default.Save();
            }

            _confirmed = true;
            NavigationManager.NavigateBack();
        }

        /// <summary>
        /// Called when the navigation system requests a result when it is navigating away from this instance.
        /// </summary>
        /// <returns></returns>
        public ColorCatalogsItem GetNavigationResult()
        {
            if (_confirmed)
            {
                return SelectedItem;
            }
            else
            {
                return null;
            }
        }

        /// <summary>
        /// Called when the navigation object has been received
        /// </summary>
        /// <param name="brushStop">The brush stop.</param>
        public virtual void OnNavigationObjectReceived(TwineCatalogNavigationObject obj)
        {
            IsFree = false;

            Filter = "CATALOG";

            Catalog = obj.Catalog;

            ColorCatalog recentCatalog = new ColorCatalog();
            recentCatalog.Name = Catalog.Name;

            var settings = SettingsManager.Default.GetOrCreate<JobsModuleSettings>();

            var settingsCatalog = settings.RecentCatalogsItems.SingleOrDefault(x => x.Guid == Catalog.Guid);
            if (settingsCatalog != null)
            {
                var allItems = Catalog.ColorCatalogsGroups.SelectMany(x => x.ColorCatalogsItems).ToList();

                foreach (var itemGuid in settingsCatalog.RecentItems)
                {
                    var realItem = allItems.SingleOrDefault(x => x.Guid == itemGuid);

                    if (realItem != null)
                    {
                        var group = recentCatalog.ColorCatalogsGroups.SingleOrDefault(x => x.Guid == realItem.ColorCatalogsGroup.Guid);
                        if (group == null)
                        {
                            group = new ColorCatalogsGroup();
                            group.Guid = realItem.ColorCatalogsGroup.Guid;
                            group.Name = realItem.ColorCatalogsGroup.Name;
                            group.GroupIndex = realItem.ColorCatalogsGroup.GroupIndex;
                            recentCatalog.ColorCatalogsGroups.Add(group);
                        }

                        group.ColorCatalogsItems.Add(realItem);
                    }
                }
            }

            Recent = recentCatalog;

            SelectedItem = obj.SelectedItem;

            IsFree = true;
        }
    }
}