using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Erp.Notifications.Entities;
using Microsoft.EntityFrameworkCore;
using Volo.Abp.DependencyInjection;
using Volo.Abp.Domain.Repositories;
using Volo.Abp.Identity;
using Volo.Abp.Users;

namespace Erp.Notifications.Domain;

public interface INotificationManager : ITransientDependency
{
    Task SendNotificationAsync(string NotificationType, string NotificationMessage);
    Task SendNotificationAsync(string NotificationType, string NotificationChannel, string NotificationMessage, string Identifier, Guid? UserId = null);
}

public class NotificationManager : INotificationManager
{
    private readonly IReadOnlyRepository<NotificationRule> repository;
    private readonly IReadOnlyRepository<IdentityUser> repositoryUser;
    private readonly IReadOnlyRepository<IdentityRole> repositoryRole;
    private readonly IRepository<Notification, Guid> repositoryNotification;
    private readonly INotificationIdentifierProvider notificationIdentifierProvider;
    private readonly IOrganizationUnitRepository repositoryOrganizationUnit;
    private readonly ICurrentUser currentUser;

    public NotificationManager(
        IReadOnlyRepository<NotificationRule> repository,
        IReadOnlyRepository<IdentityUser> repositoryUser,
        IReadOnlyRepository<IdentityRole> repositoryRole,
        IRepository<Notification, Guid> repositoryNotification,
        INotificationIdentifierProvider notificationIdentifierProvider,
        IOrganizationUnitRepository repositoryOrganizationUnit,
        ICurrentUser currentUser
        )
    {
        this.repository = repository;
        this.repositoryUser = repositoryUser;
        this.repositoryRole = repositoryRole;
        this.repositoryNotification = repositoryNotification;
        this.notificationIdentifierProvider = notificationIdentifierProvider;
        this.repositoryOrganizationUnit = repositoryOrganizationUnit;
        this.currentUser = currentUser;
    }

    public async Task SendNotificationAsync(string NotificationType, string NotificationMessage)
    {
        var list = await repository.GetListAsync(a => a.NotificationType == NotificationType);
        var notificationRules = list
            .GroupBy(a => new { a.NotificationType, a.Channel })
            .Select(a =>
            {
                var item = a.FirstOrDefault(a => a.IsFixed)
                        ?? a.FirstOrDefault(a => a.IsCustomized)
                        ?? a.FirstOrDefault(a => a.IsActive)
                        ?? a.First();
                return item;
            })
            .Where(a => a.IsActive)
            .ToList();

        var queryUsers = await repositoryUser.GetQueryableAsync();
        foreach (var notificationRule in notificationRules)
        {
            List<Guid> userIds = [];

            // RecipientType bakarak ilgilileri bul
            if (notificationRule.RecipientType == NotificationRecipientTypes.All)
            {
                // Tum userlar
                var allUserIds = await queryUsers
                    .Where(u => u.IsActive)
                    .Select(a => a.Id)
                    .ToListAsync();
                userIds.AddRange(allUserIds);
            }
            else if (notificationRule.RecipientType == NotificationRecipientTypes.User)
            {
                var user = await queryUsers.FirstOrDefaultAsync(a => a.UserName == notificationRule.RecipientId);
                if (user != null)
                {
                    userIds.Add(user.Id);
                }
            }
            else if (notificationRule.RecipientType == NotificationRecipientTypes.Role)
            {
                var role = await repositoryRole.FirstOrDefaultAsync(a => a.Name == notificationRule.RecipientId);
                if (role != null)
                {
                    var roleUserIds = await queryUsers
                        .Where(u => u.Roles.Any(r => r.RoleId == role.Id) && u.IsActive)
                        .Select(a => a.Id)
                        .ToListAsync();
                    userIds.AddRange(roleUserIds);
                }
            }
            else if (notificationRule.RecipientType == NotificationRecipientTypes.OrganizationUnit)
            {
                var units = await repositoryOrganizationUnit.GetAllChildrenWithParentCodeAsync(notificationRule.RecipientId, null);
                foreach (var unit in units)
                {
                    var memberIds = await repositoryOrganizationUnit.GetMemberIdsAsync(unit.Id);
                    userIds.AddRange(memberIds);
                }
            }

            var notifications = new List<Notification>();

            //Eğer "Custom" seçildiyse girilen RecipientId dinamik olabilir. Telefon Numarası, Email vs.
            if  (notificationRule.RecipientType == NotificationRecipientTypes.Custom) {
                var notification = new Notification
                {
                    NotificationRuleId = notificationRule.Id,
                    NotificationType = NotificationType,
                    NotificationChannel = notificationRule.Channel,
                    Identifier = notificationRule.RecipientId!,
                    UserId = currentUser.Id,
                    Message = NotificationMessage,
                    IsSent = false,
                    IsRead = false
                };
                notifications.Add(notification);
            }
            else {
                if (userIds.IsNullOrEmpty())
                {
                    continue;
                }

                userIds = [.. userIds.Distinct()];

                foreach (var userId in userIds)
                {
                    var identifier = await notificationIdentifierProvider.GetIdentifier(userId, notificationRule.Channel);
                    if (identifier.IsNullOrEmpty())
                    {
                        continue;
                    }

                    var notification = new Notification
                    {
                        NotificationRuleId = notificationRule.Id,
                        NotificationType = NotificationType,
                        NotificationChannel = notificationRule.Channel,
                        Identifier = identifier,
                        UserId = userId,
                        Message = NotificationMessage,
                        IsSent = false,
                        IsRead = false
                    };
                    notifications.Add(notification);
                }
            }
            
            await repositoryNotification.InsertManyAsync(notifications);
        }
    }


    /// <summary>
    /// Belirtilen Ident
    /// </summary>
    /// <param name="NotificationType"></param>
    /// <param name="NotificationMessage"></param>
    /// <param name="Identifier"></param>
    /// <param name="UserId"></param>
    /// <returns></returns>
    public async Task SendNotificationAsync(
        string NotificationType,
        string NotificationChannel,
        string NotificationMessage,
        string Identifier,
        Guid? UserId = null)
    {
        if (NotificationChannel == Enums.NotificationChannels.WhatsApp)
        {
            if (Identifier.StartsWith('5'))
            {
                Identifier = "+90" + Identifier;
            }
            else if (Identifier.StartsWith("05"))
            {
                Identifier = "+9" + Identifier;
            }
        }

        await repositoryNotification.InsertAsync(new Notification
        {
            NotificationType = NotificationType,
            NotificationChannel = NotificationChannel,
            Identifier = Identifier,
            UserId = UserId,
            Message = NotificationMessage,
            IsSent = false,
            IsRead = false
        });
    }
}