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

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

namespace Application.Features.Api.Stocks.GetMarketQuotes;

/// <summary>
/// 주요 종목·상품 시세 그리드 — MarketQuoteSnapshot 을 그룹(GroupCode)으로 필터하고 그룹→등락률 내림차순 정렬해 반환한다.
/// Category 는 숫자값으로 노출(프론트 라벨맵). 그룹 미지정 시 전체.
/// </summary>
internal sealed class Handler(IAppDbContext db) : IQueryHandler<Query, Response>
{
    public async Task<Response> Handle(Query request, CancellationToken ct)
    {
        var query = db.MarketQuoteSnapshot.AsNoTracking();

        if (!string.IsNullOrWhiteSpace(request.Group))
        {
            var group = request.Group.Trim().ToLowerInvariant();
            query = query.Where(c => c.GroupCode == group);
        }

        var rows = await query
            .OrderBy(c => c.GroupCode).ThenByDescending(c => c.FlucRateBp)
            .Select(c => new Response.Row
            {
                Symbol = c.Symbol,
                Name = c.Name,
                Category = (int)c.Category,
                GroupCode = c.GroupCode,
                CountryCode = c.CountryCode,
                Close = c.Close,
                ChangeVal = c.ChangeVal,
                FlucRateBp = c.FlucRateBp,
                Volume = c.Volume,
                TradeDate = c.TradeDate
            })
            .ToListAsync(ct);

        return new Response
        {
            List = rows
        };
    }
}