using gehGassi.Core.Interfaces;
using gehGassi.Domain.Favourites;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using gehGassi.Domain.Common;
using gehGassi.Domain.Devices;

namespace gehGassi.Core.Services
{
	/// <summary>
	/// Service der die Verwaltung von Devices der App-User ermöglicht
	/// </summary>
	public class DeviceService : ServiceBase<Device>, IDeviceService
	{
		/// <summary>
		/// Erstellt eine Instanz
		/// </summary>
		/// <param name="unitOfWork">Instanz eines IUnitOfWork</param>
		public DeviceService(IUnitOfWork unitOfWork) : base(unitOfWork)
		{
		}

		/// <summary>
		/// Anlegen oder Aktualisieren eines Devices
		/// </summary>
		/// <param name="appUserId">ID des AppUsers</param>
		/// <param name="installationId">eindeutige InstallationsID</param>
		/// <param name="platform">Platform (OS)</param>
		/// <param name="notificationPlatform">Platform (PNS)</param>
		/// <param name="channel">Token des Users</param>
		/// <param name="language">Sprache die am Gerät eingestellt ist</param>
		/// <param name="suppresCommit">Soll Commit untertrückt werden</param>
		/// <returns>Device</returns>
		public async Task<Device> CreateOrUpdateAsync(string appUserId, string installationId, Platform platform, NotificationPlatform notificationPlatform, string channel, string language, bool suppresCommit)
		{
			var device = await Repository.FirstOrDefaultAsync(c => c.AppUserId == appUserId && c.InstallationId == installationId);
			if (device != null)
			{
				device.Platform = platform;
				device.NotificationPlatform = notificationPlatform;
				device.Channel = channel;
				device.Language = language;
				device.LastUpdate = DateTimeOffset.UtcNow;
			}
			else
			{
				device = new Device
				{
					AppUserId = appUserId,
					InstallationId = installationId,
					Platform = platform,
					NotificationPlatform = notificationPlatform,
					Channel = channel,
					Language = language,
					Created = DateTimeOffset.UtcNow
				};
				Repository.Add(device);
			}

			if (!suppresCommit)
				await CommitAsync("System");

			return device;
		}

		/// <summary>
		/// Löschen eines Devices eines Benutzers mit einer InstallationsId
		/// </summary>
		/// <param name="appUserId"></param>
		/// <param name="installationId"></param>
		/// <param name="suppresCommit">Soll Commit untertrückt werden</param>
		/// <returns></returns>
		public async Task<bool> DeleteAsync(string appUserId, string installationId, bool suppresCommit)
		{
			var device = await Repository.FirstOrDefaultAsync(c => c.AppUserId == appUserId && c.InstallationId == installationId);
			if (device != null)
			{
				Remove(device);
				if (!suppresCommit)
					await CommitAsync("System");
				return true;
			}
			return false;
		}

		/// <summary>
		/// Gibt eine Liste aller Devices eines App-Users zurück
		/// </summary>
		/// <param name="appUserId">Id des AppUsers</param>
		/// <returns>Liste von Devices</returns>
		public async Task<List<Device>> GetAllAsync(string appUserId)
		{
			return (await Repository.FindAsync(c => c.AppUserId == appUserId).ConfigureAwait(false)).ToList();
		}

		/// <summary>
		/// Gibt ein Device für einen App-User zurück
		/// </summary>
		/// <param name="appUserId">Id des App-Users</param>
		/// <param name="installationId">InstallationsId des Devices</param>
		/// <returns>Device oder null, wenn nicht gefunden</returns>
		public async Task<Device> GetAsycn(string appUserId, string installationId)
		{
			return await Repository.FirstOrDefaultAsync(c => c.AppUserId == appUserId && c.InstallationId == installationId);
		}
	}
}