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using System.Collections.Concurrent;
using Agent.Planner;
namespace Agent.Core.Sessions;
public sealed class AgentSession(Guid sessionId)
{
private readonly object _sync = new();
private readonly List<ConversationMessage> _conversation = [];
private readonly List<ExecutionResult> _executionResults = [];
private readonly ConcurrentDictionary<Guid, TaskGraph> _taskGraphs = new();
public Guid SessionId { get; } = sessionId;
public DateTimeOffset CreatedAt { get; } = DateTimeOffset.UtcNow;
public DateTimeOffset LastAccessAt { get; private set; } = DateTimeOffset.UtcNow;
public string? Summary { get; private set; }
public IReadOnlyList<ConversationMessage> Conversation
{
get { lock (_sync) return _conversation.ToArray(); }
}
public IReadOnlyList<ExecutionResult> ExecutionResults
{
get { lock (_sync) return _executionResults.ToArray(); }
}
/// <summary>
/// TaskGraphs owned by this session, keyed by MCP Task ID.
/// One TaskGraph per agent_run execution (not shared across tasks).
/// </summary>
public ConcurrentDictionary<Guid, TaskGraph> TaskGraphs => _taskGraphs;
public void Append(ConversationMessage message)
{
ArgumentNullException.ThrowIfNull(message);
lock (_sync)
{
_conversation.Add(message);
LastAccessAt = DateTimeOffset.UtcNow;
}
}
public void AppendExecutionResult(ExecutionResult result)
{
ArgumentNullException.ThrowIfNull(result);
lock (_sync)
{
_executionResults.Add(result);
LastAccessAt = DateTimeOffset.UtcNow;
}
}
public void SetSummary(string summary)
{
ArgumentException.ThrowIfNullOrWhiteSpace(summary);
lock (_sync)
{
Summary = summary;
LastAccessAt = DateTimeOffset.UtcNow;
}
}
/// <summary>
/// Removes old conversation entries from the active context set after summary compaction.
/// Audit/LLM logs are NOT affected — only the context-active representation is compacted.
/// </summary>
public void CompactConversation(int keepLastN)
{
lock (_sync)
{
if (_conversation.Count > keepLastN)
_conversation.RemoveRange(0, _conversation.Count - keepLastN);
LastAccessAt = DateTimeOffset.UtcNow;
}
}
/// <summary>
/// Removes old execution results from the active context set after summary compaction.
/// </summary>
public void CompactExecutionResults(int keepLastN)
{
lock (_sync)
{
if (_executionResults.Count > keepLastN)
_executionResults.RemoveRange(0, _executionResults.Count - keepLastN);
LastAccessAt = DateTimeOffset.UtcNow;
}
}
}
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