package scheduler

import (
	"testing"
	"time"
)

func TestSchedulerLoopSleepCapsManualPollWithoutForcingAutoRun(t *testing.T) {
	now := time.Date(2026, 5, 20, 10, 0, 0, 0, time.UTC)
	nextAutoAt := now.Add(time.Minute)

	got := schedulerLoopSleep(now, nextAutoAt)
	if got != schedulerManualPollInterval {
		t.Fatalf("schedulerLoopSleep() = %s, want %s", got, schedulerManualPollInterval)
	}
}

func TestNextIntervalAutoAtUsesLastRunOnInitialStart(t *testing.T) {
	now := time.Date(2026, 5, 20, 10, 0, 0, 0, time.UTC)
	last := now.Add(-time.Minute)

	got := nextIntervalAutoAt(now, 5*time.Minute, true, &last)
	want := last.Add(5 * time.Minute)
	if !got.Equal(want) {
		t.Fatalf("nextIntervalAutoAt() = %s, want %s", got, want)
	}
}

func TestNextIntervalAutoAtRunsImmediatelyWhenOverdue(t *testing.T) {
	now := time.Date(2026, 5, 20, 10, 0, 0, 0, time.UTC)
	last := now.Add(-10 * time.Minute)

	got := nextIntervalAutoAt(now, 5*time.Minute, true, &last)
	if !got.Equal(now) {
		t.Fatalf("nextIntervalAutoAt() = %s, want %s", got, now)
	}
}

func TestNextIntervalAutoAtSchedulesAfterCurrentCompletion(t *testing.T) {
	now := time.Date(2026, 5, 20, 10, 0, 0, 0, time.UTC)

	got := nextIntervalAutoAt(now, 5*time.Minute, false, nil)
	want := now.Add(5 * time.Minute)
	if !got.Equal(want) {
		t.Fatalf("nextIntervalAutoAt() = %s, want %s", got, want)
	}
}