package server

import (
	"fmt"
	"testing"
	"time"

	"chat-agent-system/internal/chat"
)

func TestEnforceSessionCapEvictsOldest(t *testing.T) {
	s := &Server{sessions: map[string]*chat.Session{}}
	oldest := chat.NewSession("oldest", nil, nil, nil)
	oldest.TouchLastAccessed()
	s.sessions[oldest.ID] = oldest
	time.Sleep(5 * time.Millisecond)
	for i := 0; i < maxLiveSessions-1; i++ {
		id := fmt.Sprintf("s%d", i)
		sess := chat.NewSession(id, nil, nil, nil)
		sess.TouchLastAccessed()
		s.sessions[id] = sess
	}
	if len(s.sessions) != maxLiveSessions {
		t.Fatalf("setup len=%d", len(s.sessions))
	}
	s.enforceSessionCapLocked()
	if _, ok := s.sessions["oldest"]; ok {
		t.Fatal("oldest session must be evicted at the cap")
	}
	if len(s.sessions) != maxLiveSessions-1 {
		t.Fatalf("len=%d", len(s.sessions))
	}
}