50 lines
1.5 KiB
C#
50 lines
1.5 KiB
C#
using Microsoft.EntityFrameworkCore;
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public class News2Service : INews2Service
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{
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private readonly AppDbContext _db;
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public News2Service(AppDbContext db) => _db = db;
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public async Task<News2Score?> GetCurrentAsync(Guid encounterId)
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{
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return await _db.News2Scores
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.AsNoTracking()
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.Where(s => s.EncounterId == encounterId)
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.OrderByDescending(s => s.CalculatedAt)
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.FirstOrDefaultAsync();
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}
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public async Task<CursorPage<News2Score>> GetHistoryAsync(
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Guid encounterId, int limit, string? cursorToken)
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{
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limit = Math.Clamp(limit, 1, 100);
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var cursor = News2ScoreCursor.Decode(cursorToken);
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var query = _db.News2Scores
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.AsNoTracking()
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.Where(s => s.EncounterId == encounterId);
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if (cursor is not null)
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{
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query = query.Where(s =>
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s.CalculatedAt < cursor.CalculatedAt ||
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(s.CalculatedAt == cursor.CalculatedAt && s.Id.CompareTo(cursor.Id) < 0));
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}
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var items = await query
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.OrderByDescending(s => s.CalculatedAt)
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.ThenByDescending(s => s.Id)
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.Take(limit + 1)
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.ToListAsync();
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var hasMore = items.Count > limit;
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if (hasMore) items.RemoveAt(limit);
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var nextCursor = hasMore
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? new News2ScoreCursor(items[^1].CalculatedAt, items[^1].Id).Encode()
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: null;
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return new CursorPage<News2Score>(items, nextCursor, hasMore);
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}
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} |