using System;
using System.Threading;
using System.Threading.Tasks;
using FastEndpoints;
using GB5Shared.Draft;
using GB5Shared.DTO.Draft;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.FastEndPoint;
using static GB5Shared.GB5Constant.Constant;

namespace FrameworkSL.Endpoints.Draft
{
    /// <summary>
    /// Transfers a draft to another user. Dual-layer ownership check:
    /// BLL checks application-layer, SP checks at DB level.
    /// Returns 401-style error if the caller is not the owner.
    /// </summary>
    public class ShareDraft
        : BaseEndpoint<ShareDraft.Parameters, ResponseStandardDTO<object>>
    {
        private readonly IDraftRowBLL _bll;

        public ShareDraft(IDraftRowBLL bll) => _bll = bll;

        public override void Configure()
        {
            Post("/Draft/ShareDraft");
            AllowAnonymous();
        }

        public record Parameters(
            [property: FromHeader] string Login,
            [property: FromBody]   DraftShareDTO DraftShare
        );

        protected override string? GetCacheKey(Parameters req, LoginDTO login) => null;

        protected override async Task<ResponseStandardDTO<object>> ExecuteAsync(
            Parameters req, LoginDTO login, CancellationToken ct)
        {
            try
            {
                var result = await _bll.ShareDraftAsync(req.DraftShare, login, ct);
                return await GB5Shared.ResponseStandard.Response
                    .CreateSuccessResponse(result, CacheKeyLevel.NOT_REQUIRED, login);
            }
            catch (UnauthorizedAccessException uex)
            {
                return await GB5Shared.ResponseStandard.Response
                    .CreateExceptionError<string>(uex, CacheKeyLevel.NOT_REQUIRED, login, uex.Message, 403);
            }
            catch (Exception ex)
            {
                return await GB5Shared.ResponseStandard.Response
                    .CreateExceptionError<string>(ex, CacheKeyLevel.NOT_REQUIRED, login, ex.Message, 500);
            }
        }
    }
}