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

namespace TINK.ViewModel.Map
{
	public class GroupFilterMapPage : IGroupFilterMapPage
	{
		public GroupFilterMapPage(IDictionary<string, FilterState> filterDictionary = null)
		{
			FilterDictionary = filterDictionary ?? new Dictionary<string, FilterState>();
			Filter = filterDictionary != null
				? (IGroupFilter)new IntersectGroupFilter(FilterDictionary.Where(x => x.Value == FilterState.On).Select(x => x.Key))
				: new NullGroupFilter();
		}

		private IGroupFilter Filter { get; }

		/// <summary> Gets the active filters.</summary>
		/// <param name="filterCollection">Filter collection to get group from.</param>
		/// <returns>List of active filters.</returns>
		/// <todo>Rename to ToFilterList</todo>
		public IList<string> GetGroup()
		{
			return this.Where(x => x.Value == FilterState.On).Select(x => x.Key).ToList();
		}

		/// <summary> Performs filtering on response-group. </summary>
		public IEnumerable<string> DoFilter(IEnumerable<string> filter = null) => Filter.DoFilter(filter);

		private IDictionary<string, FilterState> FilterDictionary { get; }

		public FilterState this[string key] { get => FilterDictionary[key]; set => FilterDictionary[key] = value; }

		public ICollection<string> Keys => FilterDictionary.Keys;

		public ICollection<FilterState> Values => FilterDictionary.Values;

		public int Count => FilterDictionary.Count;

		public bool IsReadOnly => true;

		public void Add(string key, FilterState value) => throw new System.NotImplementedException();

		public void Add(KeyValuePair<string, FilterState> item) => throw new System.NotImplementedException();

		public void Clear() => throw new System.NotImplementedException();

		public bool Contains(KeyValuePair<string, FilterState> item) => FilterDictionary.Contains(item);

		public bool ContainsKey(string key) => FilterDictionary.ContainsKey(key);

		public void CopyTo(KeyValuePair<string, FilterState>[] array, int arrayIndex) => FilterDictionary.CopyTo(array, arrayIndex);

		public IEnumerator<KeyValuePair<string, FilterState>> GetEnumerator() => FilterDictionary.GetEnumerator();

		public bool Remove(string key) => throw new System.NotImplementedException();

		public bool Remove(KeyValuePair<string, FilterState> item) => throw new System.NotImplementedException();

		public bool TryGetValue(string key, out FilterState value) => FilterDictionary.TryGetValue(key, out value);

		IEnumerator IEnumerable.GetEnumerator() => FilterDictionary.GetEnumerator();
	}
}