using FastEndpoints;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.DTO.Report;
using GB5Shared.FastEndPoint;
using MMBLL.MMReports;
using MMDAL.DTO.MMReports;
using static GB5Shared.GB5Constant.Constant;

namespace MMSL.EndPoints.MMReports
{
    // Procurement Overview Dashboard, Tile 1 -- "Procurement Spend Overview". Actual-spend-only
    // (no Plan vs Actual -- see the Procurement dashboard plan for why). ExecutePagedAsync returns
    // the full composite {KPIs, MonthlyTrend, CategoryBreakdown, ContractTypeSplit} object, same
    // pattern as AccountBRSDashboardReport/AccountProfitLossDashboardReport.
    public class GetProcurementSpendOverview
        : BaseReportEndpoint<GetProcurementSpendOverview.GetProcurementSpendOverviewParameter, CategorySpendDTO>
    {
        private readonly IMMReportsBLL _bll;

        public GetProcurementSpendOverview(IMMReportsBLL bll)
        {
            _bll = bll;
        }

        public override void Configure()
        {
            Post("/MMReports/GetProcurementSpendOverview");
            AllowAnonymous();
        }

        public record GetProcurementSpendOverviewParameter(
            [property: FromHeader] string Login,
            [property: FromBody] ReportCallingDTO ReportCallingDTO,
            [property: QueryParam] string BizTransactionClassIds
        );

        protected override async IAsyncEnumerable<CategorySpendDTO> ExecuteReportAsync(
            GetProcurementSpendOverviewParameter req, LoginDTO login,
            [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken ct)
        {
            var result = await _bll.GetProcurementSpendOverview(
                req.BizTransactionClassIds, req.ReportCallingDTO.CriteriaDTO, login, ct).ConfigureAwait(false);
            foreach (var row in result.CategoryBreakdown)
            {
                ct.ThrowIfCancellationRequested();
                yield return row;
            }
        }

        protected override async Task<ResponseStandardDTO<object>> ExecutePagedAsync(
            GetProcurementSpendOverviewParameter req, LoginDTO login, CancellationToken ct)
        {
            try
            {
                var result = await _bll.GetProcurementSpendOverview(
                    req.BizTransactionClassIds, req.ReportCallingDTO.CriteriaDTO, login, ct).ConfigureAwait(false);
                return await GB5Shared.ResponseStandard.Response.CreateSuccessResponse(
                    result, CacheKeyLevel.NOT_REQUIRED, login).ConfigureAwait(false);
            }
            catch (Exception ex)
            {
                return await GB5Shared.ResponseStandard.Response.CreateExceptionError<string>(
                    ex, CacheKeyLevel.NOT_REQUIRED, login, ex.Message, 500).ConfigureAwait(false);
            }
        }
    }
}