using AccountsBLL.AccountReports.AccountProfitLossDashboard;
using AccountsBLL.AccountReports;
using AccountsDAL.DTO.AccountsReports;
using FastEndpoints;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Report;
using GB5Shared.FastEndPoint;

namespace AccountsSL.EndPoints.AccountReports
{
    // Profit & Loss Dashboard — legacy's "ProfitAndLossForDashboard" (AccountsReports.svc), reading
    // from the already-posted FFINANCE fact table for a period-bucketed waterfall view. See the
    // plan file's "Finance Dashboard Migration" section. Single-consolidated-object response
    // (Items + Totals), same pattern as AccountCashFlowIndirectReport/AccountRatioAnalysisReport —
    // the default ExecutePagedAsync is overridden since this is a small, bounded result, not a
    // real paged list.
    public class AccountProfitLossDashboardReport : BaseReportEndpoint<AccountProfitLossDashboardReport.AccountProfitLossDashboardReportParameter, AccountProfitLossDashboardRowDTO>
    {
        private readonly IAccountProfitLossDashboardBLL _bll;

        public AccountProfitLossDashboardReport(IAccountProfitLossDashboardBLL bll)
        {
            _bll = bll;
        }

        public override void Configure()
        {
            Post("/AccountReports/AccountProfitLossDashboardReport");
            AllowAnonymous();
        }

        public record AccountProfitLossDashboardReportParameter(
            [property: FromHeader] string Login,
            [property: FromBody] ReportCallingDTO ReportCallingDTO
        );

        // Legacy's own PeriodType enum for this dashboard (0=Total,1=Daily,2=Weekly,3=Monthly,
        // 4=Quarterly,5=Yearly,6=FinancialQuarter,7=FinancialYear) is DELIBERATELY kept separate
        // from AccountReportCriteria.PeriodType (the MGBPERIOD-based periodic-resolution field used
        // by Trial Balance Phase 3, default 10=FN-Monthly) — the two are different enums with
        // different value semantics, so this dashboard reads its own "DashboardPeriodType"
        // criteria field directly rather than overloading the shared one.
        private static byte ParseDashboardPeriodType(GB5Shared.DTO.Framework.Criteria.CriteriaDTO? criteriaDTO)
        {
            if (criteriaDTO?.SectionCriteriaList == null) return 0;
            foreach (var section in criteriaDTO.SectionCriteriaList)
            {
                if (section.AttributesCriteriaList == null) continue;
                foreach (var attr in section.AttributesCriteriaList)
                {
                    if (attr.FieldName?.ToLowerInvariant() == "dashboardperiodtype"
                        && byte.TryParse(attr.FieldValue?.ToString(), out var value))
                        return value;
                }
            }
            return 0;
        }

        protected override async IAsyncEnumerable<AccountProfitLossDashboardRowDTO> ExecuteReportAsync(
            AccountProfitLossDashboardReportParameter req, LoginDTO login,
            [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken ct)
        {
            var criteria = AccountReportCriteriaParser.Parse(req.ReportCallingDTO.CriteriaDTO, login);
            var ouIds = criteria.OUIds is { Count: > 0 } ? criteria.OUIds : null;
            var periodType = ParseDashboardPeriodType(req.ReportCallingDTO.CriteriaDTO);

            var result = await _bll.GetProfitLossDashboard(
                criteria.PeriodFromDate, criteria.PeriodToDate, periodType, ouIds, criteria.OUGroupId, login, ct).ConfigureAwait(false);
            foreach (var row in result.Items)
            {
                ct.ThrowIfCancellationRequested();
                yield return row;
            }
        }

        protected override async Task<GB5Shared.DTO.Framework.ResponseStandard.ResponseStandardDTO<object>> ExecutePagedAsync(
            AccountProfitLossDashboardReportParameter req, LoginDTO login, CancellationToken ct)
        {
            try
            {
                var criteria = AccountReportCriteriaParser.Parse(req.ReportCallingDTO.CriteriaDTO, login);
                var ouIds = criteria.OUIds is { Count: > 0 } ? criteria.OUIds : null;
                var periodType = ParseDashboardPeriodType(req.ReportCallingDTO.CriteriaDTO);

                var result = await _bll.GetProfitLossDashboard(
                    criteria.PeriodFromDate, criteria.PeriodToDate, periodType, ouIds, criteria.OUGroupId, login, ct).ConfigureAwait(false);
                return await GB5Shared.ResponseStandard.Response.CreateSuccessResponse(
                    result, GB5Shared.GB5Constant.Constant.CacheKeyLevel.NOT_REQUIRED, login);
            }
            catch (Exception ex)
            {
                return await GB5Shared.ResponseStandard.Response.CreateExceptionError<string>(
                    ex, GB5Shared.GB5Constant.Constant.CacheKeyLevel.NOT_REQUIRED, login, ex.Message, 500);
            }
        }
    }
}