using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using CleanArchitecture.Domain.Entities;
using CleanArchitecture.Domain.Enums;
using CleanArchitecture.Infrastructure.Database;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace CleanArchitecture.Api.BackgroundServices;

public sealed class SetInactiveUsersService : BackgroundService
{
    private readonly IServiceProvider _serviceProvider;
    private readonly ILogger<SetInactiveUsersService> _logger;

    public SetInactiveUsersService(
        IServiceProvider serviceProvider,
        ILogger<SetInactiveUsersService> logger)
    {
        _serviceProvider = serviceProvider;
        _logger = logger;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        while (!stoppingToken.IsCancellationRequested)
        {
            var scope = _serviceProvider.CreateScope();
            var context = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();

            IList<User> inactiveUsers = Array.Empty<User>();

            try
            {
                inactiveUsers = await context.Users
                    .Where(user =>
                        user.LastLoggedinDate < DateTime.UtcNow.AddDays(-30) &&
                        user.Status == UserStatus.Active)
                    .Take(250)
                    .ToListAsync(stoppingToken);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error while retrieving users to set inactive");
            }

            foreach (var user in inactiveUsers)
            {
                user.SetInactive();
            }
            
            try
            {
                await context.SaveChangesAsync(stoppingToken);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error while setting users to inactive");
            }
            
            await Task.Delay(TimeSpan.FromDays(1), stoppingToken);
        }
    }
}