ANTOOZA-BACKEND/Application/Features/Api/Stocks/GetBondDetail/Handler.cs

using Application.Abstractions.Data;
using Application.Abstractions.Messaging;
using Microsoft.EntityFrameworkCore;
using SharedKernel.Results;

namespace Application.Features.Api.Stocks.GetBondDetail;

internal sealed class Handler(IAppDbContext db) : IQueryHandler<Query, Result<Response>>
{
    public async Task<Result<Response>> Handle(Query request, CancellationToken ct)
    {
        var isin = request.Isin?.Trim();
        if (string.IsNullOrEmpty(isin))
        {
            return Result.Failure<Response>(Error.Problem("Bond.IsinRequired", "채권 종목코드(ISIN)가 필요합니다."));
        }

        var master = await db.BondMaster.AsNoTracking().Where(c => c.Isin == isin).FirstOrDefaultAsync(ct);
        var interest = await db.BondInterestPayment.AsNoTracking().Where(c => c.Isin == isin).FirstOrDefaultAsync(ct);

        // KRX 일별매매(BondDailyTrade)는 (BondMarket, Code, TradeDate) 라 ISIN(Code) 최신 거래일 1행
        var market = await db.BondDailyTrade.AsNoTracking()
            .Where(c => c.Code == isin)
            .OrderByDescending(c => c.TradeDate)
            .FirstOrDefaultAsync(ct);

        if (master is null && interest is null && market is null)
        {
            return Result.Failure<Response>(Error.NotFound("Bond.NotFound", "해당 채권 정보를 찾을 수 없습니다."));
        }

        return new Response
        {
            Isin = isin,
            Master = master is null ? null : new Response.MasterInfo
            {
                Name = master.KorSecnNm,
                IssucoCustno = master.IssucoCustno,
                SecnKacd = master.SecnKacd,
                IssueDate = master.IssuDt,
                MaturityDate = master.XpirDt,
                Currency = master.IssuCurCd,
                FirstIssueAmount = master.FirstIssuAmt,
                IssueRemaining = master.IssuRema,
                CouponRate = master.CouponRate,
                OptionTpcd = master.OptionTpcd,
                ForcedEarlyRedemption = master.ForcErlyRedYn,
                RateChangeTpcd = master.MrChgTpcd,
                GuaranteeTpcd = master.GrtyTpcd,
                RankTpcd = master.RankTpcd,
                IntPayWayTpcd = master.IntPayWayTpcd,
                ParticularBondKindTpcd = master.ParticulBondKindTpcd,
                KisGrade = master.KisValatGrdCd,
                NiceGrade = master.NiceValatGrdCd,
                SciGrade = master.SciValatGrdCd,
                KrGrade = master.KrValatGrdCd,
                IsElectronicSecurity = master.EltscYn
            },
            Interest = interest is null ? null : new Response.InterestInfo
            {
                CouponRate = interest.CouponRate,
                IntPayWayTpcd = interest.IntPayWayTpcd,
                CycleTerms = interest.IntPayCycleTerms,
                CycleTpcd = interest.IntPayCycleTpcd,
                PayTimingTpcd = interest.IntPayTimsTpcd,
                BeforeCouponDate = interest.BeforeDate,
                AfterCouponDate = interest.AfterDate
            },
            Market = market is null ? null : new Response.MarketInfo
            {
                TradeDate = market.TradeDate,
                Close = market.Close,
                YieldToMaturity = market.YieldToMaturity,
                Volume = market.Volume
            }
        };
    }
}