39 lines
1.2 KiB
C#
39 lines
1.2 KiB
C#
using SharpChat.Events;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace SharpChat.EventStorage {
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public class VirtualEventStorage : IEventStorage {
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private readonly Dictionary<long, IChatEvent> Events = new();
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public void AddEvent(IChatEvent evt) {
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if(evt == null)
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throw new ArgumentNullException(nameof(evt));
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Events.Add(evt.SequenceId, evt);
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}
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public IChatEvent GetEvent(long seqId) {
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return Events.TryGetValue(seqId, out IChatEvent evt) ? evt : null;
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}
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public void RemoveEvent(IChatEvent evt) {
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if(evt == null)
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throw new ArgumentNullException(nameof(evt));
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Events.Remove(evt.SequenceId);
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}
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public IEnumerable<IChatEvent> GetChannelEventLog(string channelName, int amount = 20, int offset = 0) {
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IEnumerable<IChatEvent> subset = Events.Values.Where(ev => ev.ChannelName == channelName);
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int start = subset.Count() - offset - amount;
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if(start < 0) {
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amount += start;
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start = 0;
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}
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return subset.Skip(start).Take(amount).ToArray();
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}
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}
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}
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