using Infrastructure.Kyc.Nice;
using MediatR;
using Microsoft.Extensions.Options;
using Web.Api.Common;

namespace Web.Api.Endpoints.Developers.Profile;

internal sealed class KycCallback : IEndpoint
{
    // NICE 표준창 → return_url 콜백. NICE 가 query string 으로 web_transaction_id 전달.
    // 이 endpoint 는 cookie 없는 외부 호출이라 anonymous. 검증은 NICE result API 가 web_transaction_id 의 유효성을 보장.
    // 처리 후 Frontend 의 결과 페이지로 302 redirect.
    public void MapEndpoint(IEndpointRouteBuilder app)
    {
        app.MapGet("api/developers/profile/kyc/callback/{sessionToken}", async (
            string sessionToken,
            HttpContext httpContext,
            ISender sender,
            IOptions<NiceAuthOptions> options,
            CancellationToken ct
        ) => {
            var frontUrl = options.Value.FrontendCallbackUrl;
            if (string.IsNullOrWhiteSpace(frontUrl))
            {
                // Frontend URL 미설정 — 운영자 안내
                return Results.Problem(
                    detail: "FrontendCallbackUrl 이 설정되지 않았습니다.",
                    statusCode: 500);
            }

            var webTransactionId = httpContext.Request.Query["web_transaction_id"].ToString();
            if (string.IsNullOrEmpty(webTransactionId))
            {
                return Results.Redirect(BuildRedirect(frontUrl, ok: false, "인증이 취소되었습니다."));
            }

            var command = new Application.Features.Api.Developers.Profile.CompleteKyc.Command(sessionToken, webTransactionId);
            var result = await sender.Send(command, ct);

            return Results.Redirect(result.IsSuccess
                ? BuildRedirect(frontUrl, ok: true, null)
                : BuildRedirect(frontUrl, ok: false, result.Error.Description));
        })
        .WithTags("Developers")
        .AllowAnonymous();
    }

    private static string BuildRedirect(string frontUrl, bool ok, string? message)
    {
        var separator = frontUrl.Contains('?') ? '&' : '?';
        var ms = string.IsNullOrEmpty(message) ? string.Empty : "&message=" + Uri.EscapeDataString(message);
        return $"{frontUrl}{separator}ok={(ok ? 1 : 0)}{ms}";
    }
}