package poweroff

import (
	"errors"
	"path/filepath"
	"testing"
	"time"
)

// One accepted request per boot; the record is "current" only in the boot it was made in.
func TestOnePerBootAndCurrentFollowsTheBoot(t *testing.T) {
	boot := "1000"
	s := New(filepath.Join(t.TempDir(), "poweroff.json"), func() string { return boot })
	if s.Current() != nil {
		t.Fatal("no record yet, Current must be nil")
	}
	now := time.Date(2026, 10, 13, 18, 0, 0, 0, time.UTC)
	if _, err := s.Mark(now, 9201); err != nil {
		t.Fatalf("first Mark: %v", err)
	}
	if r := s.Current(); r == nil || !r.RequestedAt.Equal(now) || r.VMID != 9201 {
		t.Fatalf("Current after Mark = %+v", r)
	}
	if _, err := s.Mark(now.Add(time.Minute), 9201); !errors.Is(err, ErrAlreadyThisBoot) {
		t.Fatalf("second Mark in the same boot: err = %v, want ErrAlreadyThisBoot", err)
	}
	boot = "2000" // the machine was switched on again
	if s.Current() != nil {
		t.Fatal("a record from the previous boot must not be current")
	}
	if _, err := s.Mark(now.Add(time.Hour), 9201); err != nil {
		t.Fatalf("Mark in a new boot: %v", err)
	}
}

func TestUnknownBootFailsClosed(t *testing.T) {
	s := New(filepath.Join(t.TempDir(), "p.json"), func() string { return "" })
	if _, err := s.Mark(time.Now(), 1); !errors.Is(err, ErrBootUnknown) {
		t.Fatalf("err = %v, want ErrBootUnknown", err)
	}
}