using Application.Abstractions.Data;
using Domain.Entities.Members.Logs;
using Domain.Entities.Members.ValueObject;
using Domain.Entities.Store.ValueObject;
using Microsoft.EntityFrameworkCore;

namespace Application.Helpers;

/// <summary>
/// 소모품 아이템을 컨텍스트(쪽지 발송·프로필 변경) 안에서 소모하는 공용 헬퍼.
/// SaveChanges 는 호출측 트랜잭션에 위임 (원자성 보장).
/// </summary>
public static class MemberItemConsumer
{
    public static Task<bool> HasAvailableAsync(IAppDbContext db, int memberID, ItemKind kind, CancellationToken ct)
    {
        return db.MemberItem.AnyAsync(x => x.MemberID == memberID && x.Kind == kind && x.UsedAt == null && x.RevokedAt == null, ct);
    }

    /// <summary>사용 가능한 해당 종류 아이템 1개를 소모하고 로그를 남긴다. 성공 시 true (SaveChanges 미호출).</summary>
    public static async Task<bool> TryConsumeAsync(IAppDbContext db, int memberID, ItemKind kind, DateTime nowUtc, string? detail, CancellationToken ct)
    {
        var item = await db.MemberItem
            .Where(x => x.MemberID == memberID && x.Kind == kind && x.UsedAt == null && x.RevokedAt == null)
            .OrderBy(x => x.ID)
            .FirstOrDefaultAsync(ct);

        if (item is null)
        {
            return false;
        }

        item.MarkUsed(nowUtc);
        db.MemberItemUsageLog.Add(MemberItemUsageLog.Create(item.MemberID, item.ID, item.ProductID, item.Kind, MemberItemUsageAction.Used, detail));
        return true;
    }
}