using AsbCloudApp.Data;
using AsbCloudApp.Data.User;
using AsbCloudApp.Exceptions;
using AsbCloudApp.Repositories;
using AsbCloudApp.Requests;
using AsbCloudApp.Services;
using Microsoft.Extensions.Configuration;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using AsbCloudApp.Services.Notifications;
using AsbCloudDb.Model;

namespace AsbCloudInfrastructure.Services;


/// <summary>
/// Сервис "Дело скважины"
/// </summary>
public class WellFinalDocumentsService : IWellFinalDocumentsService
{
    private readonly FileService fileService;
    private readonly IUserRepository userRepository;
    private readonly IWellService wellService;
    private readonly IConfiguration configuration;
    private readonly IFileCategoryService fileCategoryService;
    private readonly IWellFinalDocumentsRepository wellFinalDocumentsRepository;
    private readonly NotificationService notificationService;

    public WellFinalDocumentsService(FileService fileService,
        IUserRepository userRepository,
        IWellService wellService,
        IConfiguration configuration,
        IFileCategoryService fileCategoryService,
        IWellFinalDocumentsRepository wellFinalDocumentsRepository,
        NotificationService notificationService)
    {
        this.fileService = fileService;
        this.userRepository = userRepository;
        this.wellService = wellService;
        this.configuration = configuration;
        this.fileCategoryService = fileCategoryService;
        this.wellFinalDocumentsRepository = wellFinalDocumentsRepository;
        this.notificationService = notificationService;
    }

    ///<inheritdoc/>
    public async Task<int> UpdateRangeAsync(int idWell, IEnumerable<WellFinalDocumentInputDto> dtos, CancellationToken token)
    {
        var data = await wellFinalDocumentsRepository.UpdateRangeAsync(idWell, dtos, token);

        var message = "от Вас ожидается загрузка на портал документа «{0}»";
        await NotifyUsersAsync(data, message, token);

        return data.Count();
    }

    ///<inheritdoc/>
    public async Task<int> SaveCategoryFileAsync(int idWell, int idCategory, int idUser, Stream fileStream, string fileName, CancellationToken token)
    {
        var dto = await wellFinalDocumentsRepository.GetCategoryAsync(idWell, idCategory, idUser, token)
            .ConfigureAwait(false);

        var file = await fileService.SaveAsync(dto.IdWell, dto.IdUser, dto.IdCategory, fileName,
             fileStream, token).ConfigureAwait(false);

        return file.Id;
    }

    ///<inheritdoc/>
    public async Task<WellFinalDocumentsHistoryDto> GetFilesHistoryByIdCategoryAsync(int idWell, int idCategory, CancellationToken token)
    {
        var request = new FileRequest
        {
            IdWell = idWell,
            IdCategory = idCategory,
        };
        var files = await fileService.GetInfosAsync(request, token).ConfigureAwait(false);

        return new WellFinalDocumentsHistoryDto { 
            IdWell = idWell,
            IdCategory = idCategory,
            Files = files
        };
    }

    ///<inheritdoc/>
    public async Task<int> ReNotifyPublishersAsync(int idWell, int idUser, int idCategory, CancellationToken token)
    {
        var wellCase = await wellFinalDocumentsRepository.GetByWellIdAsync(idWell, idUser, token);

        if (!wellCase.PermissionToSetPubliher)
            throw new ForbidException("Повторная отправка оповещений Вам не разрешена");

        var requester = await userRepository.GetOrDefaultAsync(idUser, token);
        if (requester is null)
            throw new ForbidException("Не удается вас опознать");

        var docs = wellCase.WellFinalDocuments
            .Where(doc => doc.IdCategory == idCategory)
            .Where(doc => doc.File is null)
            .SelectMany(doc => doc.Publishers
                .Select(pub => new WellFinalDocumentDBDto { 
                    IdCategory = idCategory,
                    IdUser = pub.Id,
                    IdWell = idWell
                }));

        if(!docs.Any())
            throw new ArgumentInvalidException(nameof(idCategory), "Нет такой категории, или в нее уже загружен документ");

        var message = requester.MakeDisplayName() + " ожидает от Вас загрузку на портал документа «{{0}}»";
        await NotifyUsersAsync(docs, message, token);

        return docs.Count();
    }

    private async Task NotifyUsersAsync(IEnumerable<WellFinalDocumentDBDto> dtos, string message, CancellationToken token)
    {
        foreach (var item in dtos)
        {
            var user = await userRepository.GetOrDefaultAsync(item.IdUser, token);
            if (user?.Email is not null)
            {
                var category = await fileCategoryService.GetOrDefaultAsync(item.IdCategory, token);
                var well = await wellService.GetOrDefaultAsync(item.IdWell, token)
                    ?? throw new ArgumentInvalidException(nameof(item.IdWell), "idWell doesn`t exist");

                await SendMessageAsync(well, user, category?.Name ?? string.Empty, message,
                    token);
            }
        }
    }

    private async Task SendMessageAsync(WellDto well, UserDto user, string documentCategory, string message, 
        CancellationToken cancellationToken)
    {
        const int idTransportType = 1;
        
        var factory = new WellFinalDocumentMailBodyFactory(configuration);
        var subject = factory.MakeSubject(well, documentCategory);

        var body = factory.MakeMailBodyForWellFinalDocument(
            well,
            (user.Name ?? user.Surname ?? string.Empty),
            string.Format(message, documentCategory)
        );

        await notificationService.NotifyAsync(new NotifyRequest
        {
            IdUser = user.Id,
            IdNotificationCategory = NotificationCategory.IdSystemNotificationCategory,
            Title = subject,
            Message = body,
            IdTransportType = idTransportType
        }, cancellationToken);
    }
}