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

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

namespace Application.Features.Api.Stocks.GetStockDisclosures;

/// <summary>
/// 특정 종목(6자리 StockCode)의 전자공시(DART) 목록 — 접수일(RceptDt) 내림차순, 동일자는 접수번호 내림차순 페이징 (익명).
/// 공시가 없는 종목은 빈 목록 반환 (NotFound 아님 — Disclosure 는 종목 마스터와 독립 피드).
/// </summary>
internal sealed class Handler(IAppDbContext db) : IQueryHandler<Query, Response>
{
    private const ushort MaxPerPage = 100;

    public async Task<Response> Handle(Query request, CancellationToken ct)
    {
        var page = request.Page < 1 ? 1 : request.Page;
        var perPage = request.PerPage is 0 or > MaxPerPage ? (ushort)20 : request.PerPage;

        var query = db.Disclosure.AsNoTracking().Where(c => c.StockCode == request.Code);

        var total = await query.CountAsync(ct);

        var list = await query
            .OrderByDescending(c => c.RceptDt).ThenByDescending(c => c.RceptNo)
            .Skip((page - 1) * perPage)
            .Take(perPage)
            .Select(c => new Response.Row
            {
                RceptNo = c.RceptNo,
                CorpCode = c.CorpCode,
                CorpName = c.CorpName,
                CorpCls = c.CorpCls,
                ReportNm = c.ReportNm,
                FlrNm = c.FlrNm,
                RceptDt = c.RceptDt,
                Rm = c.Rm
            })
            .ToListAsync(ct);

        return new Response
        {
            Total = total,
            List = list
        };
    }
}