using DigitalData.Core.Abstraction.Application.DTO;
using EnvelopeGenerator.Application.Common.Extensions;
using EnvelopeGenerator.Application.Common.Interfaces.Services;
using EnvelopeGenerator.Application.Resources;
using EnvelopeGenerator.Domain.Constants;
using EnvelopeGenerator.API.Models;
using Ganss.Xss;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Localization;
using Microsoft.Extensions.Options;

namespace EnvelopeGenerator.API.Controllers;

/// <summary>
/// Exposes endpoints for registering and managing two-factor authentication for envelope receivers.
/// </summary>
[ApiController]
[Route("api/tfa")]
public class TfaRegistrationController : ControllerBase
{
    private readonly ILogger<TfaRegistrationController> _logger;
    private readonly IEnvelopeReceiverService _envelopeReceiverService;
    private readonly IAuthenticator _authenticator;
    private readonly IReceiverService _receiverService;
    private readonly TFARegParams _parameters;
    private readonly IStringLocalizer<Resource> _localizer;

    /// <summary>
    /// Initializes a new instance of the <see cref="TfaRegistrationController"/> class.
    /// </summary>
    public TfaRegistrationController(
        ILogger<TfaRegistrationController> logger,
        IEnvelopeReceiverService envelopeReceiverService,
        IAuthenticator authenticator,
        IReceiverService receiverService,
        IOptions<TFARegParams> tfaRegParamsOptions,
        IStringLocalizer<Resource> localizer)
    {
        _logger = logger;
        _envelopeReceiverService = envelopeReceiverService;
        _authenticator = authenticator;
        _receiverService = receiverService;
        _parameters = tfaRegParamsOptions.Value;
        _localizer = localizer;
    }

    /// <summary>
    /// Generates registration metadata (QR code and deadline) for a receiver.
    /// </summary>
    /// <param name="envelopeReceiverId">Encoded envelope receiver id.</param>
    [Authorize]
    [HttpGet("{envelopeReceiverId}")]
    public async Task<IActionResult> RegisterAsync(string envelopeReceiverId)
    {
        try
        {
            var (uuid, signature) = envelopeReceiverId.DecodeEnvelopeReceiverId();

            if (uuid is null || signature is null)
            {
                _logger.LogEnvelopeError(uuid: uuid, signature: signature, message: _localizer.WrongEnvelopeReceiverId());
                return Unauthorized(new { message = _localizer.WrongEnvelopeReceiverId() });
            }

            var secretResult = await _envelopeReceiverService.ReadWithSecretByUuidSignatureAsync(uuid: uuid, signature: signature);
            if (secretResult.IsFailed)
            {
                _logger.LogNotice(secretResult.Notices);
                return NotFound(new { message = _localizer.WrongEnvelopeReceiverId() });
            }

            var envelopeReceiver = secretResult.Data;

            if (!envelopeReceiver.Envelope!.TFAEnabled)
                return Unauthorized(new { message = _localizer.WrongAccessCode() });

            var receiver = envelopeReceiver.Receiver;
            receiver!.TotpSecretkey = _authenticator.GenerateTotpSecretKey();
            await _receiverService.UpdateAsync(receiver);
            var totpQr64 = _authenticator.GenerateTotpQrCode(userEmail: receiver.EmailAddress, secretKey: receiver.TotpSecretkey).ToBase64String();

            if (receiver.TfaRegDeadline is null)
            {
                receiver.TfaRegDeadline = _parameters.Deadline;
                await _receiverService.UpdateAsync(receiver);
            }
            else if (receiver.TfaRegDeadline <= DateTime.Now)
            {
                return StatusCode(StatusCodes.Status410Gone, new { message = _localizer.WrongAccessCode() });
            }

            return Ok(new
            {
                envelopeReceiver.EnvelopeId,
                envelopeReceiver.Envelope!.Uuid,
                envelopeReceiver.Receiver!.Signature,
                receiver.TfaRegDeadline,
                TotpQR64 = totpQr64
            });
        }
        catch (Exception ex)
        {
            _logger.LogEnvelopeError(envelopeReceiverId: envelopeReceiverId, exception: ex, message: _localizer.WrongEnvelopeReceiverId());
            return StatusCode(StatusCodes.Status500InternalServerError, new { message = _localizer.UnexpectedError() });
        }
    }

    /// <summary>
    /// Logs out the envelope receiver from cookie authentication.
    /// </summary>
    [Authorize(Roles = ReceiverRole.FullyAuth)]
    [HttpPost("auth/logout")]
    public async Task<IActionResult> LogOutAsync()
    {
        try
        {
            await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
            return Ok();
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "{message}", ex.Message);
            return StatusCode(StatusCodes.Status500InternalServerError, new { message = _localizer.UnexpectedError() });
        }
    }
}