using System;
using System.Collections.Generic;
using System.Text;
using TINK.Model.Bikes.BikeInfoNS.BC;
using TINK.Model.Bikes;
using TINK.Repository.Response;
using Serilog;

namespace TINK.Model.Connector.Updater
{
	public static class BikeCollectionFactory
	{
		/// <summary> Gets bikes available from copri server response.</summary>
		/// <param name="bikesAvailableResponse">Response to create collection from.</param>
		/// <param name="dataSource">Specified the data source</param>
		/// <returns>New collection of available bikes.</returns>
		public static BikeCollection GetBikesAvailable(
			this BikesAvailableResponse bikesAvailableResponse,
			DataSource dataSource)
			=> GetBikesAll(
				bikesAvailableResponse?.bikes?.Values,
				new BikesReservedOccupiedResponse()?.bikes_occupied?.Values,    // There are no occupied bikes.
				string.Empty,
				() => DateTime.Now,
				dataSource);

		/// <summary> Gets bikes occupied from copri server response. </summary>
		/// <param name="bikesOccupiedResponse">Response to create bikes from.</param>
		/// <param name="dataSource">Specified the data source</param>
		/// <returns>New collection of occupied bikes.</returns>
		public static BikeCollection GetBikesOccupied(
			this BikesReservedOccupiedResponse bikesOccupiedResponse,
			string mail,
			Func<DateTime> dateTimeProvider,
			DataSource dataSource)
			=> GetBikesAll(
				new BikesAvailableResponse()?.bikes?.Values,
				bikesOccupiedResponse?.bikes_occupied?.Values,
				mail,
				dateTimeProvider,
				dataSource);

		/// <summary> Gets bikes occupied from copri server response. </summary>
		/// <param name="bikesAvailable">Response to create bikes available from.</param>
		/// <param name="bikesOccupied">Response to create bikes occupied from.</param>
		/// <returns>New collection of occupied bikes.</returns>
		public static BikeCollection GetBikesAll(
			IEnumerable<BikeInfoAvailable> bikesAvailable,
			IEnumerable<BikeInfoReservedOrBooked> bikesOccupied,
			string mail,
			Func<DateTime> dateTimeProvider,
			DataSource dataSource)
		{
			var bikesDictionary = new Dictionary<string, BikeInfo>();
			var duplicates = new Dictionary<string, BikeInfo>();

			// Get bikes from Copri/ file/ memory, ....
			if (bikesAvailable != null)
			{
				foreach (var bikeInfoResponse in bikesAvailable)
				{
					var bikeInfo = BikeInfoFactory.Create(bikeInfoResponse, dataSource);
					if (bikeInfo == null)
					{
						// Response is not valid.
						continue;
					}

					if (bikesDictionary.ContainsKey(bikeInfo.Id))
					{
						// Duplicates are not allowed.
						Log.Error($"Duplicate bike with id {bikeInfo.Id} detected evaluating bikes available. Bike status is {bikeInfo.State.Value}.");

						if (!duplicates.ContainsKey(bikeInfo.Id))
						{
							duplicates.Add(bikeInfo.Id, bikeInfo);
						}

						continue;
					}

					bikesDictionary.Add(bikeInfo.Id, bikeInfo);
				}
			}

			// Get bikes from Copri/ file/ memory, ....
			if (bikesOccupied != null)
			{
				foreach (var bikeInfoResponse in bikesOccupied)
				{
					BikeInfo bikeInfo = BikeInfoFactory.Create(
						bikeInfoResponse,
						mail,
						dateTimeProvider,
						dataSource);

					if (bikeInfo == null)
					{
						continue;
					}

					if (bikesDictionary.ContainsKey(bikeInfo.Id))
					{
						// Duplicates are not allowed.
						Log.Error($"Duplicate bike with id {bikeInfo.Id} detected evaluating bikes occupied. Bike status is {bikeInfo.State.Value}.");
						if (!duplicates.ContainsKey(bikeInfo.Id))
						{
							duplicates.Add(bikeInfo.Id, bikeInfo);
						}

						continue;
					}


					bikesDictionary.Add(bikeInfo.Id, bikeInfo);
				}
			}

			// Remove entries which are not unique.
			foreach (var l_oDuplicate in duplicates)
			{
				bikesDictionary.Remove(l_oDuplicate.Key);
			}

			return new BikeCollection(bikesDictionary);
		}

	}
}