using System;
using System.Net;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using Umbraco.Cms.Core.Configuration.Models;
using Umbraco.Cms.Web.Common.DependencyInjection;

namespace Umbraco.Cms.Core.Services.Implement
{
    public class BasicAuthService : IBasicAuthService
    {
        private readonly IIpAddressUtilities _ipAddressUtilities;
        private BasicAuthSettings _basicAuthSettings;

        // Scheduled for removal in v12
        [Obsolete("Please use the contructor that takes an IIpadressUtilities instead")]
        public BasicAuthService(IOptionsMonitor<BasicAuthSettings> optionsMonitor)
        : this(optionsMonitor, StaticServiceProvider.Instance.GetRequiredService<IIpAddressUtilities>())
        {
            _basicAuthSettings = optionsMonitor.CurrentValue;

            optionsMonitor.OnChange(basicAuthSettings => _basicAuthSettings = basicAuthSettings);
        }

        public BasicAuthService(IOptionsMonitor<BasicAuthSettings> optionsMonitor, IIpAddressUtilities ipAddressUtilities)
        {
            _ipAddressUtilities = ipAddressUtilities;
            _basicAuthSettings = optionsMonitor.CurrentValue;

            optionsMonitor.OnChange(basicAuthSettings => _basicAuthSettings = basicAuthSettings);
        }

        public bool IsBasicAuthEnabled() => _basicAuthSettings.Enabled;

        public bool IsIpAllowListed(IPAddress clientIpAddress)
        {
            foreach (var allowedIpString in _basicAuthSettings.AllowedIPs)
            {
                if (_ipAddressUtilities.IsAllowListed(clientIpAddress, allowedIpString))
                {
                    return true;
                }
            }

            return false;
        }
    }
}