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

namespace Application.Features.Api.Studio.Dashboard.GetDashboard;

internal sealed class Handler(IAppDbContext db) : IQueryHandler<Query, Response>
{
    private static readonly Response Empty = new(null);

    public async Task<Response> Handle(Query request, CancellationToken ct)
    {
        // ── 채널 정보 ──
        var channel = await db.Channel.AsNoTracking().Where(c => c.MemberID == request.MemberID && c.IsActive).Select(c => new { c.ID, c.SID, c.Name, c.ThumbnailUrl, c.IsVerified, c.SubscriberCount }).FirstOrDefaultAsync(ct);

        if (channel is null)
        {
            return Empty;
        }

        var channelInfo = new ChannelInfo(
            channel.ID, channel.SID, channel.Name,
            channel.ThumbnailUrl, channel.IsVerified, channel.SubscriberCount
        );

        return new Response(channelInfo);
    }
}