using System;
using System.Collections.Generic;
using System.Data.Common;
using System.Linq;
using System.Threading.Tasks;
using Kurs.Platform.Entities;
using Kurs.Platform.Extensions;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Volo.Abp.Domain.Repositories;
using Volo.Abp.Identity;
using Volo.Abp.Identity.AspNetCore;
using Volo.Abp.Settings;
using Volo.Abp.TenantManagement;
using Volo.Abp.Timing;
using IdentityUser = Volo.Abp.Identity.IdentityUser;
using SignInResult = Microsoft.AspNetCore.Identity.SignInResult;

namespace Kurs.Platform.Identity;

public interface IPlatformSignInManager
{
    Task<bool> PreSignInCheckAsync(IdentityUser user);
}

public class PlatformSignInManager : AbpSignInManager, IPlatformSignInManager
{
    private readonly IClock clock;
    private readonly IRepository<IpRestriction, Guid> repositoryIp;
    private readonly ITenantRepository tenantRepository;
    private readonly IdentityUserManager userManager;

    public PlatformSignInManager(
        IdentityUserManager userManager,
        IHttpContextAccessor contextAccessor,
        IUserClaimsPrincipalFactory<IdentityUser> claimsFactory,
        IOptions<IdentityOptions> optionsAccessor,
        ILogger<SignInManager<IdentityUser>> logger,
        IAuthenticationSchemeProvider schemes,
        IUserConfirmation<IdentityUser> confirmation,
        IOptions<AbpIdentityOptions> options,
        ISettingProvider settingProvider,
        IClock clock,
        IRepository<IpRestriction, Guid> repositoryIp,
        ITenantRepository tenantRepository
        ) : base(
            userManager,
            contextAccessor,
            claimsFactory,
            optionsAccessor,
            logger,
            schemes,
            confirmation,
            options,
            settingProvider)
    {
        this.clock = clock;
        this.repositoryIp = repositoryIp;
        this.tenantRepository = tenantRepository;
        this.userManager = userManager;
    }

    public async Task<bool> PreSignInCheckAsync(IdentityUser user)
    {
        var result = await PreSignInCheck(user);
        return result?.Succeeded ?? true;
    }

    protected override async Task<SignInResult> PreSignInCheck(IdentityUser user)
    {
        var result = await base.PreSignInCheck(user);

        if (result == null)
        {
            if (!await CanSignInVerifiedAsync(user))
            {
                return new PlatformSignInResult() { IsNotAllowed_NotVerified = true };
            }
            if (!CanSignInEndDate(user))
            {
                return new PlatformSignInResult() { IsNotAllowed_LoginEndDateDue = true };
            }
            if (!await CanSignInIpAsync(user))
            {
                return new PlatformSignInResult() { IsNotAllowed_NotAllowedIp = true };
            }
            if (!await IsTenantActiveAsync(user))
            {
                return new PlatformSignInResult() { IsNotAllowed_TenantIsPassive = true };
            }
        }
        else
        {
            // Bu kontrol modules\identity\src\Volo.Abp.Identity.AspNetCore\Volo\Abp\Identity\AspNetCore\AbpSignInManager.cs
            // içinde zaten yapılıyor fakat her senaryoya NotAllowed diyor, bizim ayrıt etmemiz gerektiği için tekrar yapıyoruz.
            if (user.ShouldChangePasswordOnNextLogin)
            {
                return new PlatformSignInResult() { ShouldChangePasswordOnNextLogin = true };
            }
            if (await userManager.ShouldPeriodicallyChangePasswordAsync(user))
            {
                return new PlatformSignInResult() { ShouldChangePasswordPeriodic = true };
            }
        }

        return result;
    }

    /// <summary>
    /// Tenant IsActive
    /// </summary>
    private async Task<bool> IsTenantActiveAsync(IdentityUser user)
    {
        if (!user.TenantId.HasValue)
        {
            return true;
        }

        var tenant = await tenantRepository.FindAsync(user.TenantId.Value);
        if (tenant == null)
        {
            return false;
        }

        if (!tenant.GetIsActive())
        {
            Logger.LogWarning(PlatformEventIds.UserCannotSignInTenantIsPassive, "Tenant is inactive.");
            return false;
        }

        return true;
    }

    /// <summary>
    /// Used to prevent login for additional scenarios;
    /// Account Not Verified
    /// </summary>
    private async Task<bool> CanSignInVerifiedAsync(IdentityUser user)
    {
        var rva = await SettingProvider.GetAsync<bool>(PlatformConsts.AbpIdentity.Profile.General.RequireVerifiedAccount);
        if (rva && !user.GetIsVerified())
        {
            Logger.LogWarning(PlatformEventIds.UserCannotSignInWithoutVerifiedAccount, "User cannot sign in without a verified account.");
            return false;
        }
        return true;
    }

    /// <summary>
    /// Used to prevent login if end date is due
    /// </summary>
    private bool CanSignInEndDate(IdentityUser user)
    {
        var endDate = user.GetLoginEndDate();
        if (endDate != null && clock.Now > endDate)
        {
            //izin yok
            Logger.LogWarning(PlatformEventIds.UserCannotSignInLoginEndDateDue, "User cannot sign in, login end date is due.");
            return false;
        }

        //izin ver
        return true;
    }

    /// <summary>
    /// Used to prevent login for allowed IPs;
    /// IP Not Allowed
    /// </summary>
    private async Task<bool> CanSignInIpAsync(IdentityUser user)
    {
        // User, Role, Global Restrictions
        var roles = await UserManager.GetRolesAsync(user);
        //var roleIds = roleManager.Roles.Where(a => roles.Contains(a.Name)).Select(a => a.Id).ToArray();

        var restrictions = await repositoryIp.GetListAsync(a =>
         (a.ResourceType == "User" && a.ResourceId == user.UserName) ||
         (a.ResourceType == "Role" && roles.Contains(a.ResourceId)) ||
         (a.ResourceType == "Global"));

        if (!restrictions.IsNullOrEmpty())
        {
            var ip = Context.GetRemoteIPAddress();
            var ipString = ip?.ToString();
            if (ip == null || (ip != null && !restrictions.Select(a => a.IP).Any(a => a == ipString)))
            {
                //izin yok
                Logger.LogWarning(PlatformEventIds.UserCannotSignInWithoutAllowedIp, "User cannot sign in without an allowed IP.");
                return false;
            }

        }

        //izin ver
        return true;
    }

}