package store

import (
	"testing"
	"time"
)

func TestTrimHistoryToMaxPoints(t *testing.T) {
	s := &Store{}
	base := time.Date(2026, 4, 20, 0, 0, 0, 0, time.UTC)
	s.history = make([]Sample, 0, MaxHistoryPoints+25)
	for i := 0; i < MaxHistoryPoints+25; i++ {
		s.history = append(s.history, Sample{At: base.Add(time.Duration(i) * time.Second), Value: i})
	}

	s.trimHistoryLocked(base.Add(time.Duration(MaxHistoryPoints+25) * time.Second))

	if got := len(s.history); got != MaxHistoryPoints {
		t.Fatalf("history length = %d, want %d", got, MaxHistoryPoints)
	}
	if s.history[0].Value != 25 {
		t.Fatalf("oldest retained value = %d, want %d", s.history[0].Value, 25)
	}
}