using Bit.Api.Auth.Models.Request;
using Bit.Api.Auth.Models.Request.Accounts;
using Bit.Api.Auth.Models.Response.TwoFactor;
using Bit.Api.Models.Request;
using Bit.Api.Models.Response;
using Bit.Core.Auth.Enums;
using Bit.Core.Auth.Identity.TokenProviders;
using Bit.Core.Auth.LoginFeatures.PasswordlessLogin.Interfaces;
using Bit.Core.Auth.Models.Business.Tokenables;
using Bit.Core.Context;
using Bit.Core.Entities;
using Bit.Core.Exceptions;
using Bit.Core.Repositories;
using Bit.Core.Services;
using Bit.Core.Tokens;
using Bit.Core.Utilities;
using Fido2NetLib;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;

namespace Bit.Api.Auth.Controllers;

[Route("two-factor")]
[Authorize("Web")]
public class TwoFactorController : Controller
{
    private readonly IUserService _userService;
    private readonly IOrganizationRepository _organizationRepository;
    private readonly IOrganizationService _organizationService;
    private readonly UserManager<User> _userManager;
    private readonly ICurrentContext _currentContext;
    private readonly IVerifyAuthRequestCommand _verifyAuthRequestCommand;
    private readonly IDuoUniversalTokenService _duoUniversalTokenService;
    private readonly IDataProtectorTokenFactory<TwoFactorAuthenticatorUserVerificationTokenable> _twoFactorAuthenticatorDataProtector;
    private readonly IDataProtectorTokenFactory<SsoEmail2faSessionTokenable> _ssoEmailTwoFactorSessionDataProtector;

    public TwoFactorController(
        IUserService userService,
        IOrganizationRepository organizationRepository,
        IOrganizationService organizationService,
        UserManager<User> userManager,
        ICurrentContext currentContext,
        IVerifyAuthRequestCommand verifyAuthRequestCommand,
        IDuoUniversalTokenService duoUniversalConfigService,
        IDataProtectorTokenFactory<TwoFactorAuthenticatorUserVerificationTokenable> twoFactorAuthenticatorDataProtector,
        IDataProtectorTokenFactory<SsoEmail2faSessionTokenable> ssoEmailTwoFactorSessionDataProtector)
    {
        _userService = userService;
        _organizationRepository = organizationRepository;
        _organizationService = organizationService;
        _userManager = userManager;
        _currentContext = currentContext;
        _verifyAuthRequestCommand = verifyAuthRequestCommand;
        _duoUniversalTokenService = duoUniversalConfigService;
        _twoFactorAuthenticatorDataProtector = twoFactorAuthenticatorDataProtector;
        _ssoEmailTwoFactorSessionDataProtector = ssoEmailTwoFactorSessionDataProtector;
    }

    [HttpGet("")]
    public async Task<ListResponseModel<TwoFactorProviderResponseModel>> Get()
    {
        var user = await _userService.GetUserByPrincipalAsync(User);
        if (user == null)
        {
            throw new UnauthorizedAccessException();
        }

        var providers = user.GetTwoFactorProviders()?.Select(
            p => new TwoFactorProviderResponseModel(p.Key, p.Value));
        return new ListResponseModel<TwoFactorProviderResponseModel>(providers);
    }

    [HttpGet("~/organizations/{id}/two-factor")]
    public async Task<ListResponseModel<TwoFactorProviderResponseModel>> GetOrganization(string id)
    {
        var orgIdGuid = new Guid(id);
        if (!await _currentContext.OrganizationAdmin(orgIdGuid))
        {
            throw new NotFoundException();
        }

        var organization = await _organizationRepository.GetByIdAsync(orgIdGuid);
        if (organization == null)
        {
            throw new NotFoundException();
        }

        var providers = organization.GetTwoFactorProviders()?.Select(
            p => new TwoFactorProviderResponseModel(p.Key, p.Value));
        return new ListResponseModel<TwoFactorProviderResponseModel>(providers);
    }

    [HttpPost("get-authenticator")]
    public async Task<TwoFactorAuthenticatorResponseModel> GetAuthenticator(
        [FromBody] SecretVerificationRequestModel model)
    {
        var user = await CheckAsync(model, false);
        var response = new TwoFactorAuthenticatorResponseModel(user);
        var tokenable = new TwoFactorAuthenticatorUserVerificationTokenable(user, response.Key);
        response.UserVerificationToken = _twoFactorAuthenticatorDataProtector.Protect(tokenable);
        return response;
    }

    [HttpPut("authenticator")]
    [HttpPost("authenticator")]
    public async Task<TwoFactorAuthenticatorResponseModel> PutAuthenticator(
        [FromBody] UpdateTwoFactorAuthenticatorRequestModel model)
    {
        var user = model.ToUser(await _userService.GetUserByPrincipalAsync(User));
        _twoFactorAuthenticatorDataProtector.TryUnprotect(model.UserVerificationToken, out var decryptedToken);
        if (!decryptedToken.TokenIsValid(user, model.Key))
        {
            throw new BadRequestException("UserVerificationToken", "User verification failed.");
        }

        if (!await _userManager.VerifyTwoFactorTokenAsync(user,
                CoreHelpers.CustomProviderName(TwoFactorProviderType.Authenticator), model.Token))
        {
            await Task.Delay(2000);
            throw new BadRequestException("Token", "Invalid token.");
        }

        await _userService.UpdateTwoFactorProviderAsync(user, TwoFactorProviderType.Authenticator);
        var response = new TwoFactorAuthenticatorResponseModel(user);
        return response;
    }

    [HttpDelete("authenticator")]
    public async Task<TwoFactorProviderResponseModel> DisableAuthenticator(
    [FromBody] TwoFactorAuthenticatorDisableRequestModel model)
    {
        var user = await _userService.GetUserByPrincipalAsync(User);
        _twoFactorAuthenticatorDataProtector.TryUnprotect(model.UserVerificationToken, out var decryptedToken);
        if (!decryptedToken.TokenIsValid(user, model.Key))
        {
            throw new BadRequestException("UserVerificationToken", "User verification failed.");
        }

        await _userService.DisableTwoFactorProviderAsync(user, model.Type.Value);
        return new TwoFactorProviderResponseModel(model.Type.Value, user);
    }

    [HttpPost("get-yubikey")]
    public async Task<TwoFactorYubiKeyResponseModel> GetYubiKey([FromBody] SecretVerificationRequestModel model)
    {
        var user = await CheckAsync(model, true, true);
        var response = new TwoFactorYubiKeyResponseModel(user);
        return response;
    }

    [HttpPut("yubikey")]
    [HttpPost("yubikey")]
    public async Task<TwoFactorYubiKeyResponseModel> PutYubiKey([FromBody] UpdateTwoFactorYubicoOtpRequestModel model)
    {
        var user = await CheckAsync(model, true);
        model.ToUser(user);

        await ValidateYubiKeyAsync(user, nameof(model.Key1), model.Key1);
        await ValidateYubiKeyAsync(user, nameof(model.Key2), model.Key2);
        await ValidateYubiKeyAsync(user, nameof(model.Key3), model.Key3);
        await ValidateYubiKeyAsync(user, nameof(model.Key4), model.Key4);
        await ValidateYubiKeyAsync(user, nameof(model.Key5), model.Key5);

        await _userService.UpdateTwoFactorProviderAsync(user, TwoFactorProviderType.YubiKey);
        var response = new TwoFactorYubiKeyResponseModel(user);
        return response;
    }

    [HttpPost("get-duo")]
    public async Task<TwoFactorDuoResponseModel> GetDuo([FromBody] SecretVerificationRequestModel model)
    {
        var user = await CheckAsync(model, true, true);
        var response = new TwoFactorDuoResponseModel(user);
        return response;
    }

    [HttpPut("duo")]
    [HttpPost("duo")]
    public async Task<TwoFactorDuoResponseModel> PutDuo([FromBody] UpdateTwoFactorDuoRequestModel model)
    {
        var user = await CheckAsync(model, true);
        if (!await _duoUniversalTokenService.ValidateDuoConfiguration(model.ClientSecret, model.ClientId, model.Host))
        {
            throw new BadRequestException(
                "Duo configuration settings are not valid. Please re-check the Duo Admin panel.");
        }

        model.ToUser(user);
        await _userService.UpdateTwoFactorProviderAsync(user, TwoFactorProviderType.Duo);
        var response = new TwoFactorDuoResponseModel(user);
        return response;
    }

    [HttpPost("~/organizations/{id}/two-factor/get-duo")]
    public async Task<TwoFactorDuoResponseModel> GetOrganizationDuo(string id,
        [FromBody] SecretVerificationRequestModel model)
    {
        await CheckAsync(model, false, true);

        var orgIdGuid = new Guid(id);
        if (!await _currentContext.ManagePolicies(orgIdGuid))
        {
            throw new NotFoundException();
        }

        var organization = await _organizationRepository.GetByIdAsync(orgIdGuid) ?? throw new NotFoundException();
        var response = new TwoFactorDuoResponseModel(organization);
        return response;
    }

    [HttpPut("~/organizations/{id}/two-factor/duo")]
    [HttpPost("~/organizations/{id}/two-factor/duo")]
    public async Task<TwoFactorDuoResponseModel> PutOrganizationDuo(string id,
        [FromBody] UpdateTwoFactorDuoRequestModel model)
    {
        await CheckAsync(model, false);

        var orgIdGuid = new Guid(id);
        if (!await _currentContext.ManagePolicies(orgIdGuid))
        {
            throw new NotFoundException();
        }

        var organization = await _organizationRepository.GetByIdAsync(orgIdGuid) ?? throw new NotFoundException();
        if (!await _duoUniversalTokenService.ValidateDuoConfiguration(model.ClientSecret, model.ClientId, model.Host))
        {
            throw new BadRequestException(
                "Duo configuration settings are not valid. Please re-check the Duo Admin panel.");
        }

        model.ToOrganization(organization);
        await _organizationService.UpdateTwoFactorProviderAsync(organization,
            TwoFactorProviderType.OrganizationDuo);
        var response = new TwoFactorDuoResponseModel(organization);
        return response;
    }

    [HttpPost("get-webauthn")]
    public async Task<TwoFactorWebAuthnResponseModel> GetWebAuthn([FromBody] SecretVerificationRequestModel model)
    {
        var user = await CheckAsync(model, false, true);
        var response = new TwoFactorWebAuthnResponseModel(user);
        return response;
    }

    [HttpPost("get-webauthn-challenge")]
    [ApiExplorerSettings(IgnoreApi = true)] // Disable Swagger due to CredentialCreateOptions not converting properly
    public async Task<CredentialCreateOptions> GetWebAuthnChallenge([FromBody] SecretVerificationRequestModel model)
    {
        var user = await CheckAsync(model, false, true);
        var reg = await _userService.StartWebAuthnRegistrationAsync(user);
        return reg;
    }

    [HttpPut("webauthn")]
    [HttpPost("webauthn")]
    public async Task<TwoFactorWebAuthnResponseModel> PutWebAuthn([FromBody] TwoFactorWebAuthnRequestModel model)
    {
        var user = await CheckAsync(model, false);

        var success = await _userService.CompleteWebAuthRegistrationAsync(
            user, model.Id.Value, model.Name, model.DeviceResponse);
        if (!success)
        {
            throw new BadRequestException("Unable to complete WebAuthn registration.");
        }

        var response = new TwoFactorWebAuthnResponseModel(user);
        return response;
    }

    [HttpDelete("webauthn")]
    public async Task<TwoFactorWebAuthnResponseModel> DeleteWebAuthn(
        [FromBody] TwoFactorWebAuthnDeleteRequestModel model)
    {
        var user = await CheckAsync(model, false);
        await _userService.DeleteWebAuthnKeyAsync(user, model.Id.Value);
        var response = new TwoFactorWebAuthnResponseModel(user);
        return response;
    }

    [HttpPost("get-email")]
    public async Task<TwoFactorEmailResponseModel> GetEmail([FromBody] SecretVerificationRequestModel model)
    {
        var user = await CheckAsync(model, false, true);
        var response = new TwoFactorEmailResponseModel(user);
        return response;
    }

    /// <summary>
    /// This endpoint is only used to set-up email two factor authentication.
    /// </summary>
    /// <param name="model">secret verification model</param>
    /// <returns>void</returns>
    [HttpPost("send-email")]
    public async Task SendEmail([FromBody] TwoFactorEmailRequestModel model)
    {
        var user = await CheckAsync(model, false, true);
        model.ToUser(user);
        await _userService.SendTwoFactorEmailAsync(user, false);
    }

    [AllowAnonymous]
    [HttpPost("send-email-login")]
    public async Task SendEmailLoginAsync([FromBody] TwoFactorEmailRequestModel requestModel)
    {
        var user = await _userManager.FindByEmailAsync(requestModel.Email.ToLowerInvariant());

        if (user != null)
        {
            // Check if 2FA email is from Passwordless.
            if (!string.IsNullOrEmpty(requestModel.AuthRequestAccessCode))
            {
                if (await _verifyAuthRequestCommand
                        .VerifyAuthRequestAsync(new Guid(requestModel.AuthRequestId),
                            requestModel.AuthRequestAccessCode))
                {
                    await _userService.SendTwoFactorEmailAsync(user);
                    return;
                }
            }
            else if (!string.IsNullOrEmpty(requestModel.SsoEmail2FaSessionToken))
            {
                if (ValidateSsoEmail2FaToken(requestModel.SsoEmail2FaSessionToken, user))
                {
                    await _userService.SendTwoFactorEmailAsync(user);
                    return;
                }

                await ThrowDelayedBadRequestExceptionAsync(
                    "Cannot send two-factor email: a valid, non-expired SSO Email 2FA Session token is required to send 2FA emails.");
            }
            else if (await _userService.VerifySecretAsync(user, requestModel.Secret))
            {
                await _userService.SendTwoFactorEmailAsync(user);
                return;
            }
        }

        await ThrowDelayedBadRequestExceptionAsync("Cannot send two-factor email.");
    }

    [HttpPut("email")]
    [HttpPost("email")]
    public async Task<TwoFactorEmailResponseModel> PutEmail([FromBody] UpdateTwoFactorEmailRequestModel model)
    {
        var user = await CheckAsync(model, false);
        model.ToUser(user);

        if (!await _userManager.VerifyTwoFactorTokenAsync(user,
                CoreHelpers.CustomProviderName(TwoFactorProviderType.Email), model.Token))
        {
            await Task.Delay(2000);
            throw new BadRequestException("Token", "Invalid token.");
        }

        await _userService.UpdateTwoFactorProviderAsync(user, TwoFactorProviderType.Email);
        var response = new TwoFactorEmailResponseModel(user);
        return response;
    }

    [HttpPut("disable")]
    [HttpPost("disable")]
    public async Task<TwoFactorProviderResponseModel> PutDisable([FromBody] TwoFactorProviderRequestModel model)
    {
        var user = await CheckAsync(model, false);
        await _userService.DisableTwoFactorProviderAsync(user, model.Type.Value);
        var response = new TwoFactorProviderResponseModel(model.Type.Value, user);
        return response;
    }

    [HttpPut("~/organizations/{id}/two-factor/disable")]
    [HttpPost("~/organizations/{id}/two-factor/disable")]
    public async Task<TwoFactorProviderResponseModel> PutOrganizationDisable(string id,
        [FromBody] TwoFactorProviderRequestModel model)
    {
        await CheckAsync(model, false);

        var orgIdGuid = new Guid(id);
        if (!await _currentContext.ManagePolicies(orgIdGuid))
        {
            throw new NotFoundException();
        }

        var organization = await _organizationRepository.GetByIdAsync(orgIdGuid);
        if (organization == null)
        {
            throw new NotFoundException();
        }

        await _organizationService.DisableTwoFactorProviderAsync(organization, model.Type.Value);
        var response = new TwoFactorProviderResponseModel(model.Type.Value, organization);
        return response;
    }

    [HttpPost("get-recover")]
    public async Task<TwoFactorRecoverResponseModel> GetRecover([FromBody] SecretVerificationRequestModel model)
    {
        var user = await CheckAsync(model, false);
        var response = new TwoFactorRecoverResponseModel(user);
        return response;
    }

    /// <summary>
    /// To be removed when the feature flag pm-17128-recovery-code-login is removed PM-18175.
    /// </summary>
    [Obsolete("Two Factor recovery is handled in the TwoFactorAuthenticationValidator.")]
    [HttpPost("recover")]
    [AllowAnonymous]
    public async Task PostRecover([FromBody] TwoFactorRecoveryRequestModel model)
    {
        if (!await _userService.RecoverTwoFactorAsync(model.Email, model.MasterPasswordHash, model.RecoveryCode))
        {
            await Task.Delay(2000);
            throw new BadRequestException(string.Empty, "Invalid information. Try again.");
        }
    }

    [Obsolete("Leaving this for backwards compatibility on clients")]
    [HttpGet("get-device-verification-settings")]
    public Task<DeviceVerificationResponseModel> GetDeviceVerificationSettings()
    {
        return Task.FromResult(new DeviceVerificationResponseModel(false, false));
    }

    [Obsolete("Leaving this for backwards compatibility on clients")]
    [HttpPut("device-verification-settings")]
    public Task<DeviceVerificationResponseModel> PutDeviceVerificationSettings(
        [FromBody] DeviceVerificationRequestModel model)
    {
        return Task.FromResult(new DeviceVerificationResponseModel(false, false));
    }

    private async Task<User> CheckAsync(SecretVerificationRequestModel model, bool premium,
        bool skipVerification = false)
    {
        var user = await _userService.GetUserByPrincipalAsync(User);
        if (user == null)
        {
            throw new UnauthorizedAccessException();
        }

        if (!await _userService.VerifySecretAsync(user, model.Secret, skipVerification))
        {
            await Task.Delay(2000);
            throw new BadRequestException(string.Empty, "User verification failed.");
        }

        if (premium && !await _userService.CanAccessPremium(user))
        {
            throw new BadRequestException("Premium status is required.");
        }

        return user;
    }

    private async Task ValidateYubiKeyAsync(User user, string name, string value)
    {
        if (string.IsNullOrWhiteSpace(value) || value.Length == 12)
        {
            return;
        }

        if (!await _userManager.VerifyTwoFactorTokenAsync(user,
                CoreHelpers.CustomProviderName(TwoFactorProviderType.YubiKey), value))
        {
            await Task.Delay(2000);
            throw new BadRequestException(name, $"{name} is invalid.");
        }

        await Task.Delay(500);
    }

    private bool ValidateSsoEmail2FaToken(string ssoEmail2FaSessionToken, User user)
    {
        return _ssoEmailTwoFactorSessionDataProtector.TryUnprotect(ssoEmail2FaSessionToken, out var decryptedToken) &&
               decryptedToken.Valid && decryptedToken.TokenIsValid(user);
    }

    private async Task ThrowDelayedBadRequestExceptionAsync(string message, int delayTime = 2000)
    {
        await Task.Delay(delayTime);
        throw new BadRequestException(message);
    }
}