using FastEndpoints;
using KArtSell.BuildingBlocks.Time;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;

namespace KArtSell.Modules.ModelOperations.Compliance;

/// <summary>
/// Submit GDPR right-to-be-forgotten request.
/// POST /compliance/gdpr-request
/// </summary>
public class SubmitGdprRequestDto
{
    public Guid CustomerId { get; set; }
    public string Reason { get; set; } = "Right to be forgotten (GDPR Article 17)";
}

public class GdprRequestResponseDto
{
    public Guid GdprTrackingId { get; set; }
    public string Status { get; set; } = "IN_PROGRESS";
    public DateTime EstimatedCompletion { get; set; }
    public string Message { get; set; } = string.Empty;
}

public class SubmitGdprRequestEndpoint : Endpoint<SubmitGdprRequestDto, GdprRequestResponseDto>
{
    private readonly ProcessGdprRequestHandler _handler;
    private readonly IClock _clock;
    private readonly ILogger<SubmitGdprRequestEndpoint> _logger;

    public SubmitGdprRequestEndpoint(ProcessGdprRequestHandler handler, IClock clock, ILogger<SubmitGdprRequestEndpoint> logger)
    {
        _handler = handler;
        _clock = clock;
        _logger = logger;
    }

    public override void Configure()
    {
        Post("/compliance/gdpr-request");
        AllowAnonymous();  // RBAC enforced at handler level (Data Admin/Compliance Officer role)
        Summary(x =>
        {
            x.Summary = "Submit GDPR Request";
            x.Description = "Submit right-to-be-forgotten request for customer data redaction";
        });
    }

    public override async Task HandleAsync(SubmitGdprRequestDto req, CancellationToken ct)
    {
        try
        {
            var trackingId = Guid.NewGuid();
            var now = _clock.UtcNow.UtcDateTime;
            var correlationId = HttpContext.Request.Headers.TryGetValue("X-Correlation-ID", out var header)
                ? Guid.Parse(header.ToString())
                : Guid.NewGuid();

            var command = new ProcessGdprRequestCommand
            {
                TrackingId = trackingId,
                CustomerId = req.CustomerId,
                RequestDate = now,
                Reason = req.Reason,
                CorrelationId = correlationId
            };

            await _handler.Handle(command, ct);

            var response = new GdprRequestResponseDto
            {
                GdprTrackingId = trackingId,
                Status = "IN_PROGRESS",
                EstimatedCompletion = now.AddHours(24),
                Message = $"GDPR request {trackingId} submitted. Redaction will complete within 24 hours."
            };

            await Send.ResponseAsync(response, StatusCodes.Status202Accepted, ct);

            _logger.LogInformation(
                "GDPR request {TrackingId} submitted for customer {CustomerId}",
                trackingId, req.CustomerId);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Failed to submit GDPR request for customer {CustomerId}", req.CustomerId);
            await Send.ResponseAsync(
                new GdprRequestResponseDto { Message = "Failed to submit request" },
                StatusCodes.Status500InternalServerError,
                ct);
        }
    }
}