using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using AsbCloudApp.Data;
using AsbCloudApp.Exceptions;
using AsbCloudApp.Repositories;
using AsbCloudApp.Requests;
using AsbCloudApp.Services;
using AsbCloudApp.Services.Notifications;
using Microsoft.Extensions.DependencyInjection;

namespace AsbCloudInfrastructure.Services.Notifications;

public class NotificationService : INotificationService
{
	private readonly ICrudRepository<NotificationCategoryDto> notificationCategoryRepository;
	private readonly INotificationRepository notificationRepository;
	private readonly IServiceProvider serviceProvider;

	public NotificationService(ICrudRepository<NotificationCategoryDto> notificationCategoryRepository,
		INotificationRepository notificationRepository,
		IServiceProvider serviceProvider)
	{
		this.notificationCategoryRepository = notificationCategoryRepository;
		this.notificationRepository = notificationRepository;
		this.serviceProvider = serviceProvider;
	}

	public async Task NotifyAsync(int idUser,
		int idNotificationCategory,
		string title,
		string message,
		int idTransportType,
		CancellationToken cancellationToken)
	{
		var notificationCategory = await notificationCategoryRepository
			.GetOrDefaultAsync(idNotificationCategory, cancellationToken);
		
		if(notificationCategory is null)
			throw new ArgumentInvalidException("Категория уведомления не найдена", nameof(idNotificationCategory));
		
		var notification = new NotificationDto()
		{
			IdUser = idUser,
			IdNotificationCategory = idNotificationCategory,
			Title = title,
			Message = message,
			IdTransportType = idTransportType
		};

		notification.Id = await notificationRepository.InsertAsync(notification,
			cancellationToken);

		notification.NotificationCategory = notificationCategory;

		var notificationTransportService = GetNotificationTransportService(idTransportType);

		await notificationTransportService.SendAsync(notification, cancellationToken);
	}
	
	public async Task UpdateNotificationAsync(int idNotification,
		bool isRead,
		CancellationToken cancellationToken)
	{
		var notification = await notificationRepository.GetOrDefaultAsync(idNotification,
			cancellationToken) ?? throw new ArgumentInvalidException("Уведомление не найдено", 
			nameof(idNotification));

		if (isRead)
		{
			if (notification.SentDate == null)
				throw new ArgumentInvalidException("Уведомление не может быть прочитано", nameof(isRead));
			
			notification.SentDate = DateTime.UtcNow;
		}

		await notificationRepository.UpdateAsync(notification, 
			cancellationToken);
	}

	public async Task ResendNotificationAsync(int idUser, 
		NotificationRequest request,
		CancellationToken cancellationToken)
	{
		var result = await notificationRepository.GetNotificationsAsync(idUser,
			request,
			cancellationToken);

		var notificationTransportService = GetNotificationTransportService(request.IdTransportType!.Value);

		await notificationTransportService.SendRangeAsync(result.Items, cancellationToken);
	}

	private INotificationTransportService GetNotificationTransportService(int idTransportType)
	{
		var notificationTransportService = serviceProvider.GetServices<INotificationTransportService>()
			.FirstOrDefault(s => s.IdTransportType == idTransportType);
		
		if(notificationTransportService is null)
			throw new ArgumentInvalidException("Доставщик уведомлений не найден", nameof(idTransportType));

		return notificationTransportService;
	}
}