using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authorization;
using Microsoft.EntityFrameworkCore;
using Sozsoft.Notifications.Domain;
using Sozsoft.Notifications.Entities;
using Sozsoft.Notifications.Enums;
using Volo.Abp;
using Volo.Abp.Application.Services;
using Volo.Abp.Domain.Entities;
using Volo.Abp.Domain.Repositories;
using Volo.Abp.Identity;

namespace Sozsoft.Notifications.Application;

/// <summary>
/// Kullanicinin kendi bildirimleri: liste, okundu isaretleme ve tarayici kanallarinda gosterim
/// isareti. Her sorgu <c>UserId</c> ile kendi kayitlarina kapalidir.
/// </summary>
[Authorize]
public class NotificationAppService : ReadOnlyAppService<
    Notification,
    NotificationDto,
    Guid,
    NotificationFilterRequestDto>
{
    private readonly IRepository<Notification, Guid> repository;
    private readonly IRepository<NotificationRule, Guid> repositoryRule;
    private readonly INotificationManager notificationManager;
    private readonly IRepository<IdentityUser, Guid> repositoryUser;

    public NotificationAppService(
        IRepository<Notification, Guid> repository,
        IRepository<NotificationRule, Guid> repositoryRule,
        INotificationManager notificationManager,
        IRepository<IdentityUser, Guid> repositoryUser) : base(repository)
    {
        this.repository = repository;
        this.repositoryRule = repositoryRule;
        this.notificationManager = notificationManager;
        this.repositoryUser = repositoryUser;
    }

    /// <summary>Bir kuraldan elle bildirim uretir; Bildirim Kurallari ekranindaki "Create" komutu.</summary>
    public async Task CreateNotificationByNotificationRuleIdAsync(NotificationRequestDto input)
    {
        var notificationRule = await repositoryRule.FindAsync(input.Id)
                               ?? throw new EntityNotFoundException(L["RecordNotFound"]);

        await notificationManager.SendNotificationAsync(notificationRule.NotificationTypeId, input.Message);
    }

    protected override async Task<IQueryable<Notification>> CreateFilteredQueryAsync(NotificationFilterRequestDto input)
    {
        var query = await base.CreateFilteredQueryAsync(input);

        input.Channels ??= [];
        var now = Clock.Now.AddDays(-1);
        query = query
            .AsNoTracking()
            .Include(a => a.NotificationType)
            .Where(a => a.UserId == CurrentUser.Id)
            .Where(a => input.Channels.Contains(a.NotificationChannel))
            .WhereIf(input.IsRead.HasValue, a => a.IsRead == input.IsRead)
            .WhereIf(!input.IsListRequest && !input.Channels.IsNullOrEmpty() && input.Channels!.Contains(NotificationChannels.UiToast), a => a.CreationTime >= now);

        return query;
    }

    protected override async Task<List<NotificationDto>> MapToGetListOutputDtosAsync(List<Notification> entities)
    {
        var dtos = new List<NotificationDto>();
        var userIds = entities.Select(a => a.CreatorId).Distinct().ToArray();
        var query = await repositoryUser.GetQueryableAsync();
        var users = await query.AsNoTracking().Where(a => userIds.Contains(a.Id)).Select(a => new { a.Id, Fullname = $"{a.Name} {a.Surname}".Trim(), a.TenantId }).ToDictionaryAsync(x => x.Id, x => x);

        foreach (var entity in entities)
        {
            var dto = await MapToGetListOutputDtoAsync(entity);
            if (entity.CreatorId.HasValue && users.TryGetValue(entity.CreatorId.Value, out var user))
            {
                dto.CreatorFullname = user.Fullname;
                dto.TenantId = user.TenantId;
            }
            dtos.Add(dto);
        }

        return dtos;
    }

    /// <summary>
    /// Bir kanaldaki tum kayitlari okundu/okunmadi yapar. Kullaniciya henuz iletilmemis kayit
    /// okunamaz; isaretleme onlari atlar ve gonderim gerceklestiginde tekrar okunabilir olurlar.
    /// </summary>
    public async Task<int> UpdateReadAllAsync(string notificationChannel, bool isRead)
    {
        var query = await repository.GetQueryableAsync();
        var readTime = isRead ? Clock.Now : (DateTime?)null;
        var affectedRows = await query
            .Where(a => a.UserId == CurrentUser.Id && a.NotificationChannel == notificationChannel && a.IsRead == !isRead)
            .Where(a => !isRead || a.IsSent)
            .ExecuteUpdateAsync(b => b
                .SetProperty(u => u.IsRead, isRead)
                .SetProperty(u => u.ReadTime, readTime)
            );

        return affectedRows;
    }

    /// <summary>Secili kayitlari okundu/okunmadi yapar; kural <see cref="UpdateReadAllAsync"/> ile aynidir.</summary>
    public async Task<int> UpdateReadManyAsync(List<Guid> notificationIds, bool isRead)
    {
        if (notificationIds.Count == 0)
        {
            return 0;
        }

        var query = await repository.GetQueryableAsync();
        var readTime = isRead ? Clock.Now : (DateTime?)null;

        return await query
            .Where(a => a.UserId == CurrentUser.Id && notificationIds.Contains(a.Id) && a.IsRead != isRead)
            .Where(a => !isRead || a.IsSent)
            .ExecuteUpdateAsync(setters => setters
                .SetProperty(a => a.IsRead, isRead)
                .SetProperty(a => a.ReadTime, readTime));
    }

    /// <summary>
    /// Tarayici kanallarinda (toast, masaustu) gosterim isaretidir; gosterilen kayit iletilmis
    /// sayilir. Diger kanallarin gonderimi <c>NotificationWorker</c>'a aittir.
    /// </summary>
    public async Task<int> UpdateSentManyAsync(List<Guid> notificationIds, bool isSent)
    {
        if (notificationIds.Count == 0)
        {
            return 0;
        }

        var query = await repository.GetQueryableAsync();
        return await query
            .Where(a => a.UserId == CurrentUser.Id && notificationIds.Contains(a.Id) && a.IsSent != isSent)
            .Where(a => NotificationChannels.BrowserChannels.Contains(a.NotificationChannel))
            .ExecuteUpdateAsync(setters => setters.SetProperty(a => a.IsSent, isSent));
    }

    [RemoteService(false)]
    public override Task<NotificationDto> GetAsync(Guid id) => throw new NotImplementedException();
    [RemoteService(false)]
    protected override Task<Notification> GetEntityByIdAsync(Guid id) => throw new NotImplementedException();
}