using System.Collections.Generic;
using System.Linq;
using TINK.Model;
using TINK.Model.Connector;
using TINK.Model.Connector.Filter;
using Xamarin.Forms;

namespace TINK.ViewModel.Map
{
	/// <remarks> Old name: MapPageFilter. </remarks>
	public class TinkKonradToggleViewModel : ITinkKonradToggleViewModel
	{
		/// <summary> Constructs a map page filter view model object from values.</summary>
		/// <param name="currentFilter">Filters and options dictionary.</param>
		public TinkKonradToggleViewModel(IGroupFilterMapPage currentFilter)
		{
			FilterDictionary = currentFilter ?? new GroupFilterMapPage();
		}

		/// <summary> Gets the filter values.</summary>
		public IGroupFilterMapPage FilterDictionary { get; }

		/// <summary> Gets the activated filter.</summary>
		public string CurrentFilter
		{
			get
			{
				return FilterDictionary.FirstOrDefault(x => x.Value == FilterState.On).Key ?? string.Empty;
			}
		}

		/// <summary> Gets value whether TINK is enabled or not. </summary>
		public bool IsTinkEnabled => !string.IsNullOrEmpty(CurrentFilter) && CurrentFilter.GetBikeCategory() != FilterHelper.CARGOBIKE;

		/// <summary> Gets color of the TINK button. </summary>
		public Color TinkColor => CurrentFilter.GetBikeCategory() == FilterHelper.CARGOBIKE ? Color.White : Color.FromRgba(0, 0, 0, 0);
		public Color NoTinkColor => CurrentFilter.GetBikeCategory() == FilterHelper.CARGOBIKE ? Color.FromRgb(210, 17, 20) : Color.White;
		/// <summary> Gets value whether Konrad is enabled or not. </summary>
		public bool IsKonradEnabled => !string.IsNullOrEmpty(CurrentFilter) && CurrentFilter.GetBikeCategory() != FilterHelper.CITYBIKE;

		/// <summary> Gets color of the Konrad button. </summary>
		public Color KonradColor => CurrentFilter.GetBikeCategory() == FilterHelper.CITYBIKE ? Color.White : Color.FromRgba(0, 0, 0, 0);
		public Color NoKonradColor => CurrentFilter.GetBikeCategory() == FilterHelper.CITYBIKE ? Color.FromRgb(210, 17, 20) : Color.White;

		/// <summary> Gets whether toggle functionality is visible or not. </summary>
		public bool IsToggleVisible =>
			FilterDictionary.Select(x => x.Key).ContainsGroupId(FilterHelper.CITYBIKE)
			&& FilterDictionary.Select(x => x.Key).ContainsGroupId(FilterHelper.CARGOBIKE)
			&& (IsTinkEnabled || IsKonradEnabled);

		/// <summary>
		/// Toggles from bike group TINK to Konrad or vice versa.
		/// Toggling means one of 
		/// - TINK => Konrad or
		/// - TINK => Konrad.
		/// </summary>
		/// <param name="p_strCurrentFilterSet">Filter set to toggle.</param>
		/// <returns></returns>
		public TinkKonradToggleViewModel DoToggle()
		{
			var currentFilterSet = FilterDictionary.ToArray();

			if (currentFilterSet.Length < 2)
			{
				// There is nothing to toggle because filter set contains only one element.
				return new TinkKonradToggleViewModel(FilterDictionary);
			}

			var currentState = currentFilterSet[currentFilterSet.Length - 1].Value == FilterState.On
				? FilterState.On
				: FilterState.Off;

			var toggledFilterSet = new Dictionary<string, FilterState>();

			foreach (var filterElement in currentFilterSet)
			{
				toggledFilterSet.Add(filterElement.Key, currentState);
				currentState = filterElement.Value;
			}

			return new TinkKonradToggleViewModel(new GroupFilterMapPage(toggledFilterSet));
		}
	}
}